Residual Film Research Articles

Temporal and Spatial Distribution of Residual Film in Soil Profile under Continuous Film Mulching

Plastic pollution in farmland soil has become a significant concern for scientists studying farmland ecosystems. However, the current research focus on the environmental impacts of plastics in soil overlooks crucial factors such as sources, distribution, and persistence. In this study, we examined the distribution of residual film after eight years of film mulching in mid-April 2018. We also assessed changes in spatial distribution from 2018 to 2020. Our findings reveal that eight years of film mulching significantly increased the quantity of agricultural mulch film residues in the soil. The size of residual film fragments varied from 0.25 cm2 to 109 cm2, and the average size, number, and quantity of residues were influenced by soil depth. There was a noticeable downward trend in the quantity of agricultural mulch film residues, decreasing annually by 0.525 kg·ha−1. In contrast, the number of residual films showed an average annual growth rate of 2.13 × 105 p·ha−1. Importantly, we observed a substantial accumulation of residual film fragments below the 10 cm soil layer over time. Fragments ranging from 1–5 cm2 were the most abundant and gradually accumulated in deeper soil layers, enhancing mulching film recovery efficiency. This study provides valuable insights into the influence of mulch cycles on farmland soil profiles, identifying the key locations and size-to-shape ratios of residual films. These findings serve as a theoretical foundation for implementing effective measures to control mulch film pollution in agricultural practices.

Assessing the Influence of Polymer-Based Anti-Drift Adjuvants on the Photolysis, Volatilization, and Secondary Drift of Pesticides after Application

One practice to reduce spray drift during pesticide application is the addition of certain chemical adjuvants to spraying solutions, which change their physicochemical properties and result in larger droplets. The environmental impact of these agrochemicals continues however also after application, depending on surface processes occurring upon treated surfaces. While the impact of anti-drift adjuvants has been studied regarding spray drift, their impact on the fate of deposited pesticides has received little attention. Here, the effect of a polymer-based adjuvant (polyacrylamide) on the photolysis and evaporation rates of pyrimethanil (common fungicide) from dry films were investigated under controlled laboratory conditions and during two field studies. The laboratory results indicate that the adjuvant enhances the volatilization and photolysis rate both on hydrophobic lemon leaves and hydrophilic glass substrates. These results can be attributed to an increase in the geometrical area of residual film and a widening of its circumference rim, where solutes are likely to concentrate, when generated from adjuvant-containing droplets. Such morphological differences may enhance the exposure of deposited pesticides to interact with the overlaying atmosphere and incident radiation. The field data was less conclusive, suggesting a small impact of the anti-drift adjuvant on the fungicide’s secondary drift from crops and an even lower effect on volatilization from bare soil.

Exploring microbial degradation of polyamide 4 in soils: Unveiling degradation mechanisms, pathways, and the contribution of strain NR4

Evidence for microbial degradation of polyamide 4 (PA4) has previously been reported, but little is available on the specific strains and enzymes. The mechanism responsible for the degradation is still unknown. This study investigated the degradation behaviors of PA4 films in composted, garbage and campus soil. Various characterization methods were used to evaluate the changes in morphology, structure, crystallinity, and thermal properties of PA4 films during the soil biodegradation, to assess its degradation efficiency in four types of soils. The results showed that the highest degradation behavior of soil in composted soil that almost no residual films can be observed in this type of soil after 60 days, compared to those in garbage and campus soil. PA4 degradation resulting occurring in soils can enhance the population of certain beneficial microorganisms in the soil environment, such as Ensifer, Luteimonas, etc., which play a key role in nitrogen fixation, promoting plant growth, and carbon cycling. Moreover, a highly efficient single bacterium for PA4 degradation was isolated from the soil enriched and acclimated by PA4 films, named strain NR4. The complete genome of strain NR4 was sequenced to identify relevant enzyme-coding genes and metabolic pathways associated with PA4 degradation, ultimately leading to the proposal of a mechanism for PA4 biodegradation. The research not only examined how PA4 degrades in different types of soil but also suggested practical recommendations for promoting biodegradation of other products in the nylon family. The results obtained from the current study are essential in addressing environmental issues surrounding the buildup of non-biodegradable nylon items in the ecosystem.

A case on source to soil to solutions: Distribution characteristics of microplastics in farmland soil of the largest vegetable base in Northwest China

The wide application of facility agriculture accelerated the rapid development of agriculture. However, microplastics pollution in the soil caused by long-term residual agricultural film posed a significant threat to the soil ecosystem and human health. Jingyang County of Shaanxi Province was the largest vegetable planting base in northwest China. Soil samples of facility agriculture and non-facility agriculture were collected to investigate the distribution characteristics and risks of microplastics. The abundance of microplastics in Jingyang County ranged from 200.00 to 4733.33 n·kg−1, and the mean abundance was 1955.00 n·kg−1. Microplastics abundance in facility agriculture soil was higher than that in non-facility agriculture soil, and it increased with the growth of planting years. In general, the size of soil microplastics was mainly <100 μm and the abundance was negatively correlated with particle size. There were 30 types of chemical constituents in the microplastics detected, and PE (47.03 %) and PET (11.48 %) were the main ones. In addition, the types of microplastics in soil were identical with those detected in irrigation water and fertilizer, which provided another source of soil microplastics. All the sampling sites were ecological risk category I, and there was no carcinogenic risk to human health at present. In the future, the government should advocated and encouraged farmers to improve mulch recycling efficiency. Correspondingly, more positive action should be taken to the management on mulch recycling and the standards on placement of waste agricultural inputs. This study would provide foundation data for the research of microplastics pollution in farmland and the risk assessment of ecosystem and human health.

Development and Experiment of an Innovative Row-Controlled Device for Residual Film Collector to Drive Autonomously along the Ridge.

The field harvesting process of harvesting machinery is often affected by high workload and environmental factors that can impede/delay manual rowing, thereby leading to lower efficiency and quality in the residual film collector. To address this challenge, an automatic rowing control system using the 4mz-220d self-propelled residual film collector as the experimental carrier was proposed in this study. Cotton stalks in the ridges were chosen as the research object, and a comprehensive application of key technologies, machinery, and electronic control was used, thereby incorporating a pure tracking model as the path-tracking control method. To achieve the automatic rowing function during the field traveling process, the fuzzy control principle was implemented to adjust the forward distance within the pure tracking model dynamically, and the expected steering angle of the steering wheel was determined based on the kinematic model of the recovery machine. The MATLAB/Simulink software was utilized to simulate and analyze the proposed model, thus achieving significant improvements in the automation level of the residual film collector. The field harvesting tests showed that the average deviation of the manual rowing was 0.144 m, while the average deviation of the automatic rowing was 0.066 m. Moreover, the average lateral deviation of the automatic rowing was reduced by 0.078 m with a probability of deviation within 0.1 m of 95.71%. The research study demonstrated that the designed automatic rowing system exhibited high stability and robustness, thereby meeting the requirements of the autonomous rowing operations of residual film collectors. The results of this study can serve as a reference for future research on autonomous navigation technology in agriculture.

Screening and degradation characteristics of plastic-degrading microorganisms in film-mulched vegetable soil

In recent years, the incomplete recycle of residual mulch film (RMF) leads to the increasing richness of plastic fragment in soil, which poses a serious threat to the soil ecological environment. Therefore, the degradation of RMF in soil has aroused the interest of researchers. In this study, the degradation microorganisms were screened from film-mulched vegetable field, the results showed that seven potential plastic-degradation microorganisms were screened and identified, including four bacteria (Burkholderia cepacia, Burkholderia diffusa, Burkholderia aenigmatica, Chrysebacterium nepalense) and three fungi (Geotrichum candidum, Fusarium oxysporum and Trichoderma sp.). The results of degradation ability experiments showed that the weight loss rate of single strains ranges from 1.58 to 2.44% after 90 d. The loss rate of weight-average molecular weight (Mw) and number-average molecular weight (Mn) for single strains after 30 d were 2.61–22.40% and 17.92–39.18%, respectively. In addition, the weight loss rate of the mixed strains ranges from 1.34 to 1.62% after 90 d. The loss rate of Mw and Mn for mixed strains after 30 d were 8.04–10.06% and 20.06–39.25%, respectively. The comparing results showed that there may be inhibitory interactions between microorganisms in mixed strains are culture. This research can provide theoretical basis and data support for the control and disposal measures of RMF pollution.

Oriented design of wafer-level stacking structures to enhance reliability of laser debonding of thin devices

The laser debonding process in advanced packaging has become a key technology for the debonding of ultra-thin wafers. However, improving the reliability of debonding and efficient removal of adhesive residues from thin and brittle devices remains challenging. Here, we fabricated bonding pairs formed by inorganic responsive layer, thermal buffer layer, and adhesive layer based on a structural design-oriented strategy. Experimental results showed that the thinned device wafers did not show any damage after laser debonding, and the residual adhesive film could be easily torn off. The response layer (a-Si:H) with high temperature resistance and corrosion resistance has strong photosensitivity under the action of ultraviolet laser with a wavelength of 355 nm, and rapidly decomposes to release H2 and polysilicon nanoparticles. The thermal buffer layer is primarily intended to block the heat flow and compensate internal stress. The adhesive layer acts both as an adhesive during temporary bonding and as a barrier to laser-induced gas shock waves and plasma etching of device layers during debonding. This rational structural design contributes to improves the reliability of the laser debonding process and shows great potential for application in the next generation of thin device debonding.

Densified and water-repellent biodegradable starch/PBAT composite films-packaged fertilizers: Prediction model, controlled-release mechanism and rice application

Despite the non-biodegradable petrochemical polymers-coated controlled-release fertilizers have revolutionarily promoted the agricultural production, more researches should be devoted to developing the biodegradable starch films-packaged controlled-release fertilizers. To inform the development of the starch films-packaged controlled-release fertilizers, the water-repellent ability and the controlled-release characteristic of the starch films need to be enhanced. Here, the densified starch/PBAT composite films-packaged controlled-release fertilizers (DSCFs) with the excellent water tolerance, the superior controlled-release performance and the low film materials content (1–2 %) were fabricated using the simple and solvent-free process. The significantly reduced water vapor transmissions (1-fold) and the enhanced nutrient release longevities (20–100 days) can be flexibly regulated by adjusting the PBAT contents and the film thicknesses. To fast predict the nutrient release longevity, the prediction model between the longer nutrient release longevity at 25 °C water and the accelerated longevity at 40 °C water was established by the response surface methodology. The controlled-release mechanism was clarified by the three-dimensional computerized tomography scanning technology: The smaller and lesser micropores and the densified cross-linked network of the starch/PBAT films with the increasing PBAT content can effectively resist the water into and the dissolved nutrient out of the DSCFs films, hence improving the controlled-release characteristic. Furthermore, the starch/PBAT films can be biodegraded in the soil environment to reduce the residual film contamination. The dramatically increased rice yield (71.75 %) showed the reliable practical application value of the DSCFs. The development of the biodegradable DSCFs was benefit to foster the end-user confidence in the low-film-content controlled-release fertilizers.

Are biodegradable plastic mulch films an effective way to solve residual mulch film pollution in farmland?

Are biodegradable plastic mulch films an effective way to solve residual mulch film pollution in farmland?

Bioassays of Fenazaquin 18.3% w/w (200 SC) against Two Spotted Spider Mite, Tetranychus urticae Koch (Acari: Tetranychidae): Effect of Test Method, Exposure Period and Mortality Criterion on the Precision of Response Estimates

Quinazoline class of pesticide fenazaquin 18.3% w/w (200 SC) (IUPAC name: 4-tert-butylphenethyl quinazolin-4-yl ether) is used to manage mites and insects by interfering with the biochemistry of the pests' mitochondria. Three different bioassay methods viz., leaf dip, slide dip, and residual film were evaluated using fenazaquin 18.3% w/w (200 SC) at various doses on adults of Tetranychus urticae along with two standard checks (fenazaquin 10 EC and spiromesifen 22.90% SC) and water as control. After 24 h of exposure, fenazaquin 18.3% w/w (200 SC) @ 1.25 and 1.60 ml/l exhibited 100% mortality which was comparably higher than the standard checks. The results revealed that all the doses of fenazaquin 18.3% w/w (200 SC) were superior for the management of two spotted spider mites.

High crystal quality and low residual stress composite piezoelectric films prepared by a two-step method

The crystal quality and residual stress of piezoelectric films are critical factors that limit the performance of acoustic wave devices. To overcome this challenge, a new two-step method integrating metal-organic chemical vapor deposition (MOCVD) and physical vapor deposition (PVD) was presented. The lower part of the composite film was first grown by MOCVD, exhibiting monocrystalline quality and high residual stress. Subsequently, the upper part of the composite film deposited by PVD effectively compensates for the residual stress in the lower part of the composite film. The new two-step method was validated on the growth of AlN and AlScN on sapphire substrate. A composite film Al0.8Sc0.2 N/AlN was obtained with a full width at half maximum of 0.047° for AlN (002) of rocking curve, exhibiting a residual stress of +381 MPa and a surface roughness of 1.12 nm. It demonstrates the feasibility of preparing high-quality composite piezoelectric films for further acoustic applications.

Analysis of Feed Inlet and Optimal Feeding Amount of Waste Ground Film Impurity Removal Equipment

A tumbler screen-type residual film–impurity mixture wind separator is the key equipment for the secondary utilization of farmland residual film. During its operation, the proportion of impurities in the separated waste mulch film intermittently increases, resulting in poor working stability of the device, which may hamper long-term operation. To address the above issues, the material inside the separation unit was continuously monitored, and the main factor affecting separator performance was determined to be the challenges in the effective depolymerization of some residual film-impurity mixtures. The principles of agglomeration and depolymerization of the residual film-impurity mixtures were analyzed using computational fluid dynamics (CFD) and discrete element method (DEM) flow-solid coupling simulation methods. The key factor affecting the disaggregation of the mixture was the collision force between the residual film–impurity mixture and the trommel screen. The collision force was maximum when the residual film–impurity mixture first collided with the trommel screen when it was fed into the separation device. Furthermore, simulations were carried out for different inlet structure forms; the evaluation index was the maximum collision force of the residual film–impurity mixture agglomerate on the trommel screen. The best disaggregation effect was obtained with a square feed inlet and at a feeding rate of 202 kg/h. A prototype was built using these specifications for verification. The average value of the ratio of impurities in the residual film was 6.966%, the coefficient of variation was 7.38%, and the dispersion of statistical results was small. The ratio of impurities in the residual film was kept constant during the continuous operation of the wind separator. Thus, in this study, we analyzed the agglomerate disaggregation process and provided theoretical insights for determining the optimal structures of the inlets of various cleaning devices and the feeding volumes.

Effective removal of metal-carbide contamination from diamond circuit boards by reactive ion etching

Recently, we have demonstrated the feasibility of using laser-patterned polycrystalline diamond sheets as a substrate for implantable circuit boards. The laser grooves in the diamond can be filled with biocompatible braze alloys such as Au-ABA and polished back to create long-lasting, hermetic circuit boards suitable for implantation in the human body. However, during the process of depositing molybdenum and niobium layers to aid adhesion of the Au-ABA braze, a residual film was found to form, which was resistant to both polishing and chemical etching, resulting in electrical shorting between features on the circuit board. Here, we report an optimised reactive ion etching process to remove the residual metal contamination and electrically isolate fine features on the diamond circuit boards. Samples were evaluated through energy dispersive spectroscopy elemental analysis and electrical testing of the diamond surface, confirming the complete removal of contaminants from the diamond surface.

Large-area deposition of protective (Ti,Al)N coatings onto polycarbonate

Polycarbonate (PC) and protective (Ti,Al)N coatings exhibit extremely different material properties, specifically crystal structure, thermal stability, and elastic and plastic behavior, as well as thermal expansion coefficients. These differences present formidable challenges for the deposition process development as low-temperature synthesis routes have to be explored to avoid a thermal overload of the polymer substrate. Here, a large-area sputtering process is developed to address the challenges by systematically adjusting target peak power density and duty cycle. Adhering (Ti,Al)N coatings with a critical residual tensile stress of 2.2 ± 0.2 GPa are obtained in the pulsed direct current magnetron sputtering range, whereas depositions at higher target peak power densities, realized by high power pulsed magnetron sputtering, lead to stress-induced adhesive and/or cohesive failure. The stress-optimized (Ti,Al)N coatings deposited onto PC with a target peak power density of 0.036 kW cm−2 and a duty cycle of 5.3% were investigated by the cross-cut test, confirming adhesion. By investigating the bond formation at the PC|(Ti,Al)N interface, mostly interfacial CNx bonds and a small fraction of (C−O)−(Ti,Al) bonds are identified by x-ray photoelectron spectroscopy, indicating reactions at the hydrocarbon and the carbonate groups during deposition. Nanoindentation reveals an elastic modulus of 296 ± 18 GPa for the (Ti,Al)N coating, while a Ti–Al–O layer is formed during electrochemical impedance spectroscopy in a borate buffer solution, indicating protective passivation. This work demonstrates that the challenge posed by the extremely different material properties at the interface of soft polymer substrates and hard coatings can be addressed by the systematical variation in the pulsing parameters to reduce the residual film stress.

Direct diffusion bonding of 1060Al processed by surface activation with various doses of Ar ion bombardment

In this work, the microstructure and properties of the 1060Al surface after bombardment with different doses of Ar ion and the evolution rule of the quality of the subsequent solid-state diffusion bonded joints have been investigated in detail. The results showed that the oxide layer could be removed completely at an appropriate ion bombardment dose (2 × 1018ion/cm, while kept the same energy of 1 keV), the roughness of the surface was also reduced, crystal defects such as dislocation loops formed near the surface, all of the above factors were beneficial for diffusion bonding. Well-bonded joints with a bonding ratio of ∼97.7% and a shear strength of ∼45.9 MPa could be obtained even at lower process parameters (450 °C/90 min, 5 MPa). When the bombardment dose was too low, the residual oxide film and the rough surface were not conducive to atomic diffusion at the interface, resulting in the unbonded defects in the joint. While the irradiated expansion of the 1060Al surface occurred when the bombardment dose was too high, and the bulges would crack under pressure. In both cases, it could not obtain a well-bonded interface, the joints showed a lower shear strength.

Various no-tillage years with previous residual plastic film mulching improved soil properties and agricultural benefits in an arid region

No-tillage (NT) with residual plastic film from an earlier year (NTR) is adopted in arid regions to reduce plastic film residue, decrease soil disturbances, and increase water use efficiency (WUE) and agricultural benefits. However, the effects of NTR on soil crop systems are more complex because of the high disintegrated fraction (DF) of residual plastic film and stronger soil compaction under NT. Additionally, the optimum number of years for NTR is still not elucidated. Therefore, we studied the effects of conventional tillage and NT with a new plastic film mulching (CTN and NTN, respectively) and those of 1, 2, and 3 years of NTR on soil physical properties, soil water content (SWC), maize root and shoot growth, yield, and economic benefits. The experiment was conducted for 3 years in Hetao Irrigation District, China, from 2019 to 2021. The results revealed that the longer the duration of NT (including NTN and NTR), the higher the soil bulk density and lower the total soil porosity than those under CTN in 0–30 cm soil layer. SWC decreased due to the increase in the DF of residual plastic film from NTR. In the third year (2021), SWC under NTR reduced by 5.1 % compared with that under NTN. Additionally, with the increase of NTR years, the maize root and shoot dry biomass and root to shoot ratio clearly decreased under NTR compared with those under CTN and NTN. However, the root volume density of very fine roots under NTR increased significantly in the first 2 years (2019 and 2020) of NT. The yield and WUE decreased slightly under NTR compared with those under CTN in 2019 and 2020; but the net revenue increased by 15.7 % and 9.6 %, respectively. Conversely, the significant decrease in the yield and WUE was observed under NTR compared with those under CTN in 2021 led to a 15.6 % decrease in net revenue. Moreover, a higher sustainability index was observed in the first 2 years. Therefore, NTR with 2 years can be recommended as the optimal local tillage measure with the decrease in the amount of residual plastic film and increased farm economic benefits.

YOLOv5-Atn: An Algorithm for Residual Film Detection in Farmland Combined with an Attention Mechanism.

The application of mulching film has significantly contributed to improving agricultural output and benefits, but residual film has caused severe impacts on agricultural production and the environment. In order to realize the accurate recycling of agricultural residual film, the detection of residual film is the first problem to be solved. The difference in color and texture between residual film and bare soil is not obvious, and residual film is of various sizes and morphologies. To solve these problems, the paper proposes a method for detecting residual film in agricultural fields that uses the attention mechanism. First, a two-stage pre-training approach with strengthened memory is proposed to enable the model to better understand the residual film features with limited data. Second, a multi-scale feature fusion module with adaptive weights is proposed to enhance the recognition of small targets of residual film by using attention. Finally, an inter-feature cross-attention mechanism that can realize full interaction between shallow and deep feature information to reduce the useless noise extracted from residual film images is designed. The experimental results on a self-made residual film dataset show that the improved model improves precision, recall, and mAP by 5.39%, 2.02%, and 3.95%, respectively, compared with the original model, and it also outperforms other recent detection models. The method provides strong technical support for accurately identifying farmland residual film and has the potential to be applied to mechanical equipment for the recycling of residual film.

Agricultural soil plastic as a hidden carbon source stimulates microbial activity and increases carbon dioxide emissions

Plastic film mulching is an important agricultural practice, but its accumulation in soil threatens soil health. Here, we explored the effects of plastic film on soil carbon cycling through microcosmic incubation and estimated the excess carbon dioxide (CO2) emissions of farmland soils through Meta-analysis. The results showed that plastic film released dissolved organic carbon (DOC) into the soil, which was rapidly used by microorganisms and accelerated the decomposition of soil organic carbon (SOC), increasing CO2 emissions. Soil moisture content and soil carbon content affected the rate of DOC release from plastic. We estimated that residual plastic film farmland in six northwest provinces of China, 1.39 × 105 tons of excess CO2 emissions in 2020. The soil excess CO2 emissions was influenced by polyethylene (PE) plastic concentration and soil type. Replace PE plastic film with biodegradable film, 1.05 × 106 tons of excess CO2 emissions, 7.5 times that of PE plastics.

Evaluating soil water dynamics under a no-tillage system with residual plastic film mulching in an arid region of western China using HYDRUS-2D

No-tillage (NT) with residual plastic film mulching from an earlier year (NTR) is considered an excellent agricultural strategy in arid regions, recommended to reduce not only soil disturbance but also plastic film residues. However, the soil water dynamic in the root zone under this management is more complex due to variations in soil properties and upper boundary conditions. Soil compaction and a disintegrated fraction (DF) of the residual plastic film increase in NTR years. Soil water movement under NTR is not fully understood. It is also necessary to determine a suitable number of NTR years and optimize irrigation to increase water use efficiency (WUE) and maintain sustainable agricultural development. Therefore, the HYDRUS-2D model was calibrated and validated using experimental data from 2019 to 2021 collected in the corn field with conventional tillage (CTN), NT with a new plastic film (NTN), and NTR. The soil water contents (SWC), cumulative water fluxes (CWF), and soil water balances under CTNH, NTNH, and NTRH with the high (subscript H) irrigation depth of 315 mm (the local recommendation) were evaluated using both measured and simulated data. The results for NTRH, NTRM (a medium irrigation depth of 252 mm, 80% of local recommendation), and NTRL (a low irrigation depth of 189 mm, 60% of local recommendation) scenarios were compared, and a suitable number of NTR years was determined. The results of numerical simulations agreed with observations, with the mean relative error range for the calibration and validation periods between 4.9% and 5.4%. The larger number of experimental NTR years, the larger the SWC differences for all irrigation depths, tillage practices, and mulching due to larger soil compaction under NT and a higher DF of the residual plastic film. The largest SWC differences occurred in the 0–30 cm soil layer in the third experimental year (2021), with an average SWC decrease of 2.3% for NTNH compared to CTNH and 10.2% for NTRH compared to NTNH. Simulated two-dimensional SWC distributions further confirmed these experimental results. There were lower CWF under NT and new film mulching. CWF at a depth of 30 cm was 8.5 mm lower for NTNH than for CTNH in 2021. There was a 4.2%, 30.1%, and 43.1% increase in CWF for NTRH compared to NTNH due to higher soil evaporation evaluated from the soil water balance in 2019, 2020, and 2021, respectively. The scenario simulation results showed that SWCs decreased linearly with an increase in DF and that DF of 30% can be regarded as the maximum value for obtaining high WUE under NTR. The highest WUE of 28.3 kg ha–1 mm–1 under NTR during two years was found when the local recommended irrigation depth was reduced by 20% (to 252 mm). Therefore, this management can be recommended in arid regions to avoid plastic pollution with higher WUE.

Construction and performance evaluation of novel compound oil displacement system for enhanced oil recovery

Conventional methods of flooding leave behind a significant amount of oil films that adhere to the rock surfaces. Developing novel compound oil displacement system to achieve efficient oil film peeling and migration is of great significance for further enhanced oil recovery. Herein, a novel compound oil displacement system was developed through optimization experiments using a binary surfactant mixture composed of SDBS and BS-18, along with a wetting regulator known as CAS. The minimum interfacial tension attained of compound oil displacement system was 0.0042 mN/m, indicating an ultra-low level. Meanwhile, the compound system could alter the rock surface wettability from oleophilic to strong hydrophilic, with the underwater oil contact angle substantially increasing from 18° to 123.1°. The compound system demonstrated remarkable stability at high water salinity (60000 ppm) and high temperature (90 °C). The surface strong hydrophilicity contributed to the excellent oil film peeling performance of compound system, leading to an 89.14% reduction in the oil film area within 12 h. The superior ability in interfacial tension reduction and wettability alteration of the compound system facilitated the “peeling off” and “migrating out” process of the residual oil film, and impressive enhanced oil recovery of 18.68% was achieved compared to that of the surfactant mixture SDBS/BS-18 (7.23%) and wetting regulator CAS (7.64%). It is believed that the outcomes of this work provide valuable insights into the design and optimization of effective oil displacement systems for residual oil development.