Sewage Treatment Research Articles

Construction of a Block-Based Water-Level Monitoring System for RDII Management in a Separate Sewer System

In a separate sewer system designed to independently discharge sewage and stormwater, operational issues such as sewage manhole overflow and overloading of the sewage treatment plant capacity can arise during rainfall events owing to Rainfall-Derived Inflow and Infiltration (RDII) into the sewage pipelines. Although various management strategies for RDII have been studied both domestically and internationally, research on monitoring systems that can precisely identify specific locations where RDII occurs remains insufficient. Therefore, this study analyzed the shortcomings of the existing water-level monitoring system using a case study of City A, which was designed as a separate sewer system. To efficiently manage RDII, we propose a methodology for establishing a block-based water-level monitoring system divided into large, middle, and small blocks, inspired by the block system concept used in water supply networks. By conducting water-level observations at the exits of the middle and small blocks, the specific locations of RDII occurrence can be identified. This approach is expected to facilitate effective and prompt countermeasures by accurately identifying the locations where RDII occurs.

Numerical simulation of oil-water separation in sedimentation tank based on CFD-PBM model

ABSTRACT A significant amount of wastewater has been produced from the oilfield extractive fluid with the development of oilfields in recent decades. Settling is the first process in the treatment of oilfield wastewater. As one of the most crucial devices in oilfield wastewater treatment, the vertical sedimentation tank has been widely utilized in the precipitation process. This work aims to explore the properties of vertical sedimentation tanks for oil-water separation and analyze related variables in the separation. First, we utilize the for-profit software Fluent for computational fluid dynamics, in which the RNG k-ε model, the multiphase flow mixing model, and the PBM model are used to simulate the internal flow field distribution in the vertical sedimentation tank under various boundary conditions. Then, the implication of changing the boundary conditions on the vertical sedimentation tanks is analyzed. It is demonstrated that by replacing the PBM model for the homogeneous particle size, the simulation of oil-water two-phase flow in sedimentation tanks is more correctly measured. The findings demonstrate that raising the operating temperature increases the oil content at the output and dewatering rate of the sedimentation tanks by 73.1%; however, above 44°C, the effect of oil removal gradually tends to deteriorate; the longer hydraulic retention time within the 8-h range, the better the effect of oil-water separation, with the best effect occurring at 8 h; and the more viscous the oil phase, the more resistance of the oil droplets to float, increasing the water phase oil-carrying capacity, resulting in a 36.5% reduction in oil content at the outlet and dewatering rate of the settling tanks. The simulation in this paper can provide theoretical direction and conference for the design of vertical sedimentation tanks, as well as improve the performance of oily wastewater treatment facilities.

Wastewater management by using effective phytoremediator duckweed

Water pollution and the increasing discharge of untreated wastewater into natural water bodies are intensifying the pressure on aquatic environments. Sustainable and eco-friendly methods are essential for restoring water quality and mitigating pollution. One such approach is water phytoremediation, which involves the use of aquatic plants to remove pollutants from water bodies and ecosystems. This study explored the removal of contaminants from municipal wastewater using floating aquatic plants such as Lemna minor, which have proven highly effective for phytoremediation due to their low cost, high pollutant uptake capacity, minimal generation of chemical and biological sludge, ease of transport, adaptability to diverse climatic conditions, and rapid reproduction rates. Notable findings from the research include reductions in chemical oxygen demand (COD) by 82.2%, biological oxygen demand (BOD) by 84.3%, phosphates by 63.8%, ammonium nitrogen by 75.4%, and nitrates by 79.1% for Lemna minor. Maximum plant growth occurred during the experiment at pH levels between 7 and 8. The study demonstrated that large-scale remediation could be effectively achieved using Lemna minor as a phytoremediation agent within 17 days. This method offers a cost-effective, efficient tertiary treatment for heavily polluted wastewater. Additionally, it can serve as an independent treatment solution when integrated with preliminary wastewater treatment systems in smaller communities.

Use of Biogas in Gas Turbines for the Production of Heat and Electricity

In the modern developed countries of the world, the main part of the extracted fuel and energy resources is spent on the production of electricity and heat of low and medium potential. In Ukraine, the biomethane production potential is estimated at 7.8 billion m3/year, which is 25 % of the current natural gas consumption in the country. The infrastructure of Ukraine is ready for transportation and energy use of biomethane, as biomethane is a complete analogue of natural gas. When storing organic waste ("bio-waste") – for example, the organic part of household waste - biogas, a mixture of methane and carbon dioxide, is released. This gas is a high-quality fuel for gas engines or gas turbines - just like methane gas produced from biomass in sewage treatment plants. Biogas can replace fossil fuels and is also characterized by its CO2 neutrality. Biogas can be burned on-site with little to no processing to heat buildings and power boilers or even the reactor itself. Biogas can be used for combined heat and power generation, can be simply converted to electricity using an internal combustion engine, fuel cells or gas turbine, with the resulting electricity being used on-site or sold into the electricity grid. Taking into account the advantages of using biogas, as well as the price policy for natural gas, the study carried out a calculation of the thermal scheme of the state district power plant. Natural gas is used as the main fuel, biogas was chosen for comparison. The specific heat of combustion of biogas is almost half that of natural gas. When operating on biogas, the efficiency of a gas turbine installation is 8.5 % lower, and that of a steam-gas installation is 7.5 % lower than on natural gas. Since 1000 m³ of natural gas is equivalent to 1,00 m³ of biogas, a biogas accounting factor has been introduced. On the basis of the relevant research, conclusions were drawn regarding the use of biogas as an alternative to natural gas. The relevance of the use of biogas for the production of heat and electricity is to provide a promising source of electricity and reduce carbon dioxide emissions.

ИССЛЕДОВАНИЕ НАБОРА ПРОЧНОСТИ ТЯЖЕЛОГО БЕТОНА В АГРЕССИВНОЙ СРЕДЕ. С ИСПОЛЬЗОВАНИЕМ СУЛЬФАТОСТОЙКОГО ЦЕМЕНТА

Experimental data are presented on changes in the compressive strength of heavy concrete using sulfate-resistant cement, Crimean aggregates and additives based on polycarboxylate ethers when kept in an aggressive environment - liquid from water treatment facilities in an urban-type settlement Gvardeiskoe, Simferopol district, Republic of Crimea. Compositions of heavy concrete have been developed using hyperplasticizing (polycarboxylate) additives that are capable of increasing their physical and mechanical characteristics over time when operating in aggressive environments. It is relevant to further develop the theoretical and experimental foundations for the production of cement concrete using the latest generation of superplasticizing additives based on polycarboxylates for wastewater treatment and recreational facilities. The durability of cement concrete is a key issue when using it in wastewater treatment and recreational facilities. Cement concrete can be susceptible to sulfate corrosion. Sulfates have a complex mechanism of action on the chemically active component of concrete - cement stone. Sulfates have a complex mechanism of action on the chemically active component of concrete - cement stone. The corrosive effect can increase or decrease depending on the concentration of aggressive components, with varying levels of exposure to salt solutions on the concrete structure, periodic drying, and partial immersion. This is due to the fact that the chemical processes of interaction between an aggressive environment and cement stone in concrete are influenced by physical processes of mass transfer of soluble components and crystallization of corrosion products or soluble components, which can accelerate or inhibit chemical processes. The parameters of the strength characteristics of the optimized compositions at different periods of strength gain have been established, and the average density and water resistance of the optimized concrete compositions have been established.

Application of Membrane Distillation for Secondary Effluent Treatment towards Water Recovery

This paper presented the application of Direct Contact Membrane Distillation (DCMD) for the treatment of the secondary effluent of a municipal wastewater treatment plant (WWTP) to produce fresh water. The purification studies conducted at various feed temperatures demonstrated that the permeate water flux increased and that the water flux decreased quickly at the higher feed temperature. However, the electrical conductivity of permeate remained consistent at about 2.0 μS/cm. The majority of pollutants found in the secondary effluent, including SS, COD, nitrate, nitrite, phosphate, and total coliform, were entirely eliminated throughout the MD treatment process using a bi-composite membrane made of polytetrafluoroethylene and polypropylene at different feed stream temperatures. Ammonia had a limited rate of rejection, though. Protein and organic/inorganic aggregates made up the majority of the foulants were found on the membrane surface, not the inner pores. The long-term test, which involved an 18-day operation with a feed solution concentration of ten times, revealed that no wetness issue was seen despite a notable foulant deposit and reduction in water flux.

Strategic model for integrating biogas a framework for sustainable energy integration in agro-industries

The framework of the methodology presented in this study is an effort to integrate and optimize the agro-industry sector, especially energy in biogas. In this study, the technique of the system in functional analysis is shown systematically to translate various energy requirements in the factory as criteria for performance and functional design to be integrated, optimized, and energy efficient. The case study results indicated that biogas power plants, with a capacity of 1.5 MW, can produce around 13,140 MWh per year. The annual return on investment (ROI) is around 37.13%. With this ROI value, the payback period is 31 months. The overall reduction of greenhouse gases is approximately 77,826 tons CO2 eq/year. The potential value of carbon trading is about USD 3,113,040 per year. This strategic model presents a novel approach by integrating biogas energy production with a customized wastewater treatment system adapted to biodigesters’ effluent characteristics. It offers a sustainable, economically feasible, and scalable solution, combining resource recovery, waste minimization, and potential for carbon trading into a unified system. The novelty of this research lies in maximizing the utility of biogas plants by efficiently treating and reusing wastewater, creating a closed-loop, zero-waste process. Future research on hybrid systems integrating Biogas power plants by focusing on efficiency optimization, economic feasibility, environmental impacts, and innovative approaches like AI and blockchain could make the hybrid system a more robust, scalable, and sustainable solution. Thus, the framework based on the results of this study finds tools that can maximize and integrate energy sources, especially biogas, in the agro-industrial sector.

Spatiotemporal dynamics and spatial correlation patterns of urban ecological resilience across the Yellow River Basin in China

Addressing the need to harmonize environment conservation and sustainable economic development within the Yellow River Basin (YRB) requires a profound comprehension of the spatiotemporal dynamics of urban ecosystem resilience. This study developed an index system utilizing the resistance-adaptability-recovery framework to measure these dynamics. By applying the advanced multi-attribute boundary area comparison method and a spatial autocorrelation model, we investigated the spatiotemporal variations and spatial correlation patterns of urban ecological resilience across the YRB. The results of this study indicated that: (1) from 2011 to 2020, the value of urban ecological resilience index (UERI) in the YRB consistently ranged between 0.43 and 0.83, and the resilience degree of the urban ecosystem in the YRB progressively improved, with notably higher resilience in the southeast compared to the northwest; (2) the resilience degree of the urban ecosystem in the YRB was non-equilibrium in space. Spatial analysis indicates significant disparities in resilience levels across different areas within the YRB, marked by considerable fluctuations in the global Moran’s I index and significant changes in local autocorrelation clustering patterns; and (3) key factors such as wastewater discharge volume, sewage treatment rate, and the rate of non-hazardous treatment of domestic waste were identified as critical determinants of the overall ecological resilience. This research not only deepens our understanding of the factors driving urban ecological resilience but also aids in the formulation of strategic regional policy for sustainable development across the YRB.

Atmospheric Aggravation Potential of a Wastewater Treatment Plant Concerning Organochlorine Pesticides, Polychlorinated Biphenyls, and Polybrominated Diphenyl Ether Emissions.

The pollution potential of a municipal wastewater treatment plant (WWTP) in Bursa, Türkiye, in terms of organochlorine pesticides (Σ22OCPs), polychlorinated biphenyls (Σ46PCBs), and polybrominated diphenyl ethers (Σ14PBDEs), was investigated in air samples. Concentrations were determined using polyurethane foam disk samplers at key processes, such as the aeration tank (AT) and settling chamber (SC) of the WWTP and the background area (BA) at an urban site. Atmospheric concentration levels of PBDEs at the SC are 1.3 times higher than at the AT site. PCBs concentration levels are listed as SC>BA>AT from high to low. The highest OCPs concentration levels were detected at the BA site while the lowest concentration levels were obtained for the SC site. Compared to organochlorine pollutants (PCBs and OCPs), PBDEs levels were higher by two orders of magnitude ranging from 0.2 to 54.3 ng/g. While the presence of OCPs was not significant, an unusual abundance of mirex was observed. HCB, HCHs (excluding β-HCH), and p,p'-DDE resulting mainly from the settling tank indicate enhanced mass transfer from wastewater to air. Regarding PCBs, the level and detection frequency of dioxin-like PCBs (118, 123) in the aeration tank and the settling chamber were remarkable. The upper levels of PBDEs congeners 17, 85, 138, 153, and 154 resulting from the settling tank suggest an enhanced mass transfer from water to air as the source medium. Although the primary fate of trace organics in WWTPs is expected to be sorption to sludge, the present study has shown that WWTPs can be a non-negligible source of local atmospheric PCB and PBDE pollution. However, this study provides a snapshot of the levels of persistent organic pollutants and emissions, and there is no doubt that more detailed and long-term studies are needed.

Water Quality Characteristics and Seasonal Changes in Wastewater Treatment in the Southern Hebei Region by Branch

This study analyzed three years of data (2021–2024) from three wastewater treatment plants (WWTPs), namely D, X, and T, in the main urban area of Handan, a typical city in the southern Hebei region, and investigated the influent characteristics and impact of temperature on these wastewater treatment facilities. With 90% assurance, the overall influent conditions of the three WWTPs in this region were normal. However, Plant T operated more effectively with slightly lower BOD5/CODCr (B/C), organic carbon/total phosphorus (C/TP), and organic carbon/total nitrogen (C/TN) ratios in the influent. Plant D consistently met the Level A standard, Plant X essentially reached the Level A standard, while Plant T attained the Level 2 standard prior to its upgrade. Following the upgrade, Plant T also steadily met the Level A standard. The effluent from all plants was relatively stable, primarily influenced by the influent characteristics and slightly influenced by temperature, but without having a noticeable impact on the effluent quality.

Optimizing vertical up-flow engineered wetland systems for textile wastewater treatment: effects of flow rate, plant type, and column height

Optimizing vertical up-flow engineered wetland systems for textile wastewater treatment: effects of flow rate, plant type, and column height

RESEARCH ON MIXING AND COMPOSTING SLUDGE FROM THE WASTEWATER TREATMENT SYSTEM AT THE COCA - COLA VIETNAM FACTORY, HANOI BRANCH TO CREATE PRODUCTS ORIENTED FOR PLANTING

Sludge generated from the wastewater treatment systems of the beverage production industry represents a significant environmental concern. Reusing sludge is considered a sustainable approach. This study applied methods of blending sludge with other biomass materials, such as rice husk charcoal, followed by anaerobic composting. The results indicate that sludge from the wastewater treatment system of the Coca-Cola Vietnam factory, Hanoi branch, mixed with rice husk charcoal at a volumetric ratio of 80:20 and composted anaerobically for 30 days, produced a suitable substrate for tabletop ornamental plants. The study also suggests that this product has the potential to replace traditional growing media, thereby reducing treatment costs while simultaneously delivering both economic and environmental benefits.

Системный анализпроцесса очистки сточных вод животноводческих ферм

System analysis of the wastewater treatment process of livestock farms is an important stage in ensuring environmental safety and sustainable development of animal husbandry. The main objective of the work is to improve the efficiency of the wastewater treatment process of livestock farms based on system analysis. Wastewater generated on farms contains a high level of organic pollutants, pathogenic microorganisms and nutrients, which can significantly affect the quality of the environment. To solve this problem, an integrated approach was used, which included hydrological, biochemical and technological aspects. The possibility of introducing modern biotechnology is considered, which will significantly reduce the negative impact on the environment and increase the level of sustainability of livestock enterprises. Depending on the sources of pollution and the main pollutants, technical solutions were developed to reduce the volume of wastewater and purify it. The efficiency of their operation can be ensured with the help of modern methods of information processing, using methods of system analysis of complex objects based on a mathematical description of the technological process. A two-level system model was developed to study the patterns of operation of a bio-treatment device under conditions of dynamically changing parameters of the technological process. To analyze the state of the treatment system as a whole and predict the development of emergency situations, a software implementation of a wastewater treatment system for livestock farms was created.

The Use of Recycled Ceramics and Ash from Municipal Sewage Sludge as Concrete Fillers

The main aim of the research was to evaluate the feasibility of using recycled ceramics and ash from municipal sewage sludge as concrete fillers. As part of the study, standard cylindrical and cubic samples were investigated. The samples consisted of waste ceramic aggregate fractions 0–4 mm and 4–8 mm, which were sourced from used products manufactured by a sanitary fittings factory, as well as ash from one of the Polish sewage treatment plants. The chemical composition and morphology of recycled materials used to produce concrete were examined. The research itself focused on determining the strength properties of the produced composites under both normal conditions and after initial heat treatment. Microstructural tests of the produced composites were also carried out. The results demonstrated that selected recycled materials can successfully replace materials previously used in concrete production. The obtained strength results do not differ significantly from the strength of concrete made of traditional materials. Research has confirmed the possibility of using waste materials as concrete fillers.

Poly(aminoamide) Based Fluorescent Microgel: A Functional Platform for Selective Detection and Discrimination of Cu2+ and Pb2+ Ions via Turn‐off/on Behavior in Water

ABSTRACTSelective detection of more than one metal ion contaminant in water using a single fluorescent probe is challenging. In this work, a one‐pot synthetic approach is presented to prepare fluorescent poly(aminoamide) microgel, which can detect simultaneously and selectively both Cu2+ and Pb2+ by fluorescent turn off and turn on at pH 7 and 12 respectively. Further, while testing water containing a mixture of both Cu2+ and Pb2+ as contaminants, the microgel can detect the characteristic presence of Cu2+ at pH 7 and Pb2+ at pH 12 via their respective turn‐off and on behavior. The mechanistic studies revealed that the dynamic quenching defines the fluorescent turn‐off behavior of the microgel in the presence of Cu2+. On the other hand, aggregation‐induced emission (AIE) is primarily responsible for the fluorescent turn‐on of the microgel in the presence of Pb2+. Additionally, applicability of microgels in real life industrial applications are checked by detecting the presence of both analytes in waste water sample collected from a local sewage treatment plant (STP water).

Transformation behavior and toxicity assessment of beaytlmethodeyammonNium chbride (BAC-12) disinfectant during hospital wastewater treatment.

This work focused on the transformation behavior of the emerging beaytlmethodeyammonium chbride (BAC-12) disinfectant existed in the treatment of medical sewage during its disinfection treatment. The degradation ability of ozone (O3) to BAC-12 was the best, followed by UV/NaOCl, UV, and NaOCl. The enhancement of BAC-12 in UV/NaOCl system is caused by the combined effect of UV photolysis, reactive chlorine species (RCS), and •OH. The transformation products of BAC-12 in the disinfection treatment were detected, and the chemical structure of products was rationalized by frontier molecular orbital and transition state theory methodologies. According to the ecological structure-activity relationship (ECOSAR) assessment, the intermediates of BAC-12 in UV, NaOCl, and UV/NaOCl treatments had lower half lethal concentration (LC50) and chronic toxicity (ChV) values with a higher ecotoxicity than BAC-12. O3 disinfection treatment of these toxic intermediates can significantly reduce the toxicity of the BAC-12 solution. This work provides necessary information on the potential environmental risks of BAC-12 arising from different disinfection methods in the treatment of medical wastewater.

Wastewater-based monitoring of antipyretics use during COVID-19 outbreak in China and its associated ecological risks.

At the end of 2022, a sudden policy shift in China triggered an unprecedented COVID-19 outbreak that led to a dramatic increase in the consumption of antipyretics. In this study, the occurrence of the two most commonly used antipyretics (ibuprofen and paracetamol) and their metabolites were analyzed in the wastewater of nine major cities in China, covering the periods before, during, and after the policy change. The remarkable surge after the policy change for ibuprofen and paracetamol reached 67 times (in Nanning) and 311 times (in Lanzhou) compared to pre-pandemic levels, respectively. The variation of increases was mainly affected by the availability and the sampling period. During the outbreak period, direct discharge of high-drug-load wastewater could cause even higher risks; the RQ values were 0.43 for invertebrates in Lanzhou and 0.30 for fish in Nanning. Furthermore, during the post-pandemic period, wastewater discharge might pose high risks (RQ value was 2.58 in Xining to algae) associated with ibuprofen chronic toxicity. Fortunately, wastewater treatments would significantly reduce this risk to a low level (RQ<0.1). In some less developed areas, the lack of a comprehensive wastewater treatment system may lead to the direct discharge of untreated wastewater due to exfiltration of sewers, overflow of combined sewers, or lack of centralized or decentralized treatment facilities. Establishing a comprehensive wastewater treatment system is of great importance, especially in remote and impoverished areas. These results indicated that the potential ecological risks associated with epidemic outbreaks should not be overlooked. These risks may be heightened due to acute toxicity during health incidents, such as the COVID-19 outbreak, providing valuable insights for ecological management in future public health crises.

The Nitrogen Removal Characteristics of a Novel Salt-Tolerant Bacterium, Enterobacter quasihormaechei DGFC5, Isolated from Municipal Sludge

A novel bacterial strain, Enterobacter quasihormaechei DGFC5, was isolated from a municipal sewage disposal system. It efficiently removed ammonium, nitrate, and nitrite under conditions of 5% salinity, without intermediate accumulation. Provided with a mixed nitrogen source, DGFC5 showed a higher utilization priority for NH4+-N. Whole-genome sequencing and nitrogen balance experiments revealed that DGFC5 can simultaneously consume NH4+-N in the liquid phase through assimilation and heterotrophic nitrification, and effectively remove nitrate via aerobic denitrification and dissimilatory reduction reactions. Single-factor experiments were conducted to determine the optimal nitrogen removal conditions, which were as follows: a carbon-to-nitrogen ratio of 15, a shaking speed of 200 rpm, a pH of 7, C4H4Na2O4 as the carbon source, and a temperature of 30 °C. DGFC5 showed efficient nitrogen purification capabilities under a wide range of environmental conditions, indicating its potential for disposing of nitrogenous wastewater with high salinity.

Coagulation-Flocculation/Pyrolysis Integrated System for Dye-Laden Wastewater Treatment: A Techno-Economic and Sustainable Approach

While several studies have employed coagulation-flocculation (CF) for textile wastewater (TW) treatment, conventional process optimization techniques cause insufficient pollution reduction and large sludge volume generation that deteriorate the environmental matrix and elevate the system’s operating cost. To avoid these drawbacks, this study focuses on optimizing an integrated CF/pyrolysis process using artificial intelligence technique and response surface methodology (RSM) for the dual benefit of TW treatment and biochar production. In the CF experiment, water hyacinth (WH) was employed as a bio-coagulant material for TW treatment under different pH, coagulant dosage, mixing speed, and settling time levels. Under the optimum CF conditions yielded by RSM and artificial neural network (ANN) models (initial pH: 5.5 vs. 5.7, WH dosage: 3.76 g/L vs. 3.5 g/L, settling time: 116 min vs. 102 min, and slow mixing speed: 25 rpm vs. 23 rpm), incomparable removal efficiencies for dye (87.3% vs. 91.3%) and turbidity (93.4% vs. 98.2%) were obtained. These removal efficiencies dropped to 83.5% and 87.6%, respectively, for operating the CF process using unoptimized operating factors. The pyrolysis of post-coagulation sludge yielded a carbon-rich biochar material characterized by a porous structure and abundant cationic microelements. The integrated performance of the CF/pyrolysis scheme under ANN-based optimal conditions achieved a shorter payback period of 5.2 years compared to RSM (5.7 years) and unoptimized (7.9 years) conditions. Furthermore, the optimized scheme supported several sustainable development goals that complied with clean water, good health, and climate change mitigation.Graphical

Screening and diversity analysis of Dibutyl phthalate degrading bacteria in agricultural soil in Chengdu, China.

Dibutyl phthalate (DBP) with teratogenicity, carcinogenesis, and mutagenesis, is a ubiquitous endocrine disruptor in the environment. The widespread usage of plastic mulch has resulted in a severe DBP pollution problem in agricultural soil. One of the most vital ways to mitigate the DBP pollution problem is to use DBP degrading bacteria to reduce the concentration of DBP in agricultural soil. DBP degrading bacteria studied in previous studies mainly come from sewage treatment plants, rivers, landfills, bioreactors, and other environmental media. At the same time, there was relatively little research on DBP degrading bacteria in agricultural soil. Therefore, using the pure culture approach, the candidate DBP degrading strains were isolated and screened from vegetable plots contaminated with plastic mulch in Dayi County, Chengdu City, Sichuan Province, China. The taxonomy of the strains was determined using the 16 sedimentation ribosomal deoxyribonucleic acid (16S rDNA) molecular technique. Furthermore, ultraviolet and visible spectrophotometry and high performance liquid chromatography (HPLC) were used to assess the degrading capability of strains. The findings showed that a total of twenty-six DBP degrading strains were screened from vegetable plots contaminated with plastic mulch in Dayi County, Chengdu City, Sichuan Province, China, and these strains belonged to two phyla: Proteobacteria and Bacillota, eight families, including Pseudomonas, Enterobacteriaceae, and Bacillaceae, as well as ten genera, such as Enterobacter, Pseudomonas, and Bacillus. One of them, the strain SWDB-7 was a potentially new species in the Enterobacter genus. The most prominent genus of the isolated strains was Enterobacter. There were significant variations in the degradation capability of different obtained DBP degrading strains. and their degradation efficiency was 14.12%-91.86%. With a total DBP removal rate of 91.86%, strain SWDB-15 had the most effective degrading capability among them. To sum up, the DBP degrading strains in vegetable plots contaminated with plastic mulch in Dayi County, Chengdu City, Sichuan Province, China are rich in diversity and capable of breaking down DBP.