Wastewater Purification Systems Research Articles

Phytopurifying activity of Salvia officinalis L. from Tunisia

The sage (Salvia officinalis L.) is an annual and biennial plant of Mediterranean origin from the Lamiaceae family. It's a valuable medicinal plant, which is widely used in traditional medicine in world and in Tunisia; this species is very rich in active biological compounds.The objective of this study was to determine the phyto-purifying activity of sage essential, fixed oil and ethanolic extracts in an extensive wastewater purification system of Tunisian national sanitation office. We have measured the physico-chemical parameters of wastewater treated with sage oils and extracts. Then, we have carried out a bacteriological analysis of this wastewater.Our results showed that pH values measured following treatment with sage essential oil gave a pH close to neutral. Therefore, this water can be used for irrigation. In addition, the sage leaves and stems have a considerable effect on the salinity and caused a very remarkable increase in electrical conductivity of the wastewater, the measure of elimination rate demonstrated the effectiveness of sage extracts in eliminating all the microorganisms existing in wastewater.In fact, sage essential oil has the greatest effectiveness in reducing the chemical oxygen demand of the wastewater and we have noticed that a decrease in chemical oxygen demand of microorganisms existing in the wastewater was necessarily accompanied by a decrease in biological oxygen demand. Therefore, sage leaves and stems were more effective in reducing suspended matter existing in wastewater.

Synergistically electronic interacted PVDF/CdS/TiO2 organic-inorganic photocatalytic membrane for multi-field driven panel wastewater purification

Solar-driven wastewater purification technology is a promising candidate to solve the hazards of water contaminants. However, it is difficult for most of particulate photocatalysts to maintain durable photoactivity due to its micro/nano size. Herein, a synergistically electronic interacted membrane catalyst with large extending area and high pollutant capture capacity was processed based on a highly active CdS/TiO2 heterojunction and ferroelectric polyvinylidene fluoride for achieving highly efficient Cr6+-to-Cr3+ (CTC) reduction (1.6×10−2 min−1) and synchronous decomposition of organic matters (methylene blue (1.2×10−2 min−1) and bisphenol A (0.6×10−2 min−1)) under simulated sunlight (SSL, 74.1 mW·cm−2) irradiation following a durably steady photoactivity even being recycled for 20 times, which effectively avoided the hazards of secondary pollution. Subsequently, a tailor-made panel wastewater purification system was first built based on this membrane catalyst to drive CTC reduction and synchronous organic matter degradation, and high-efficiency purification performance was presented on this panel system under multi-field drive of light-activation and piezoelectric polarization. This work provides an insight for photocatalytic wastewater purification through membrane catalyst assisted panel technology.

Four-in-one multifunctional self-driven photoelectrocatalytic system for water purification: Organics degradation, U(VI) reduction, electricity generation and disinfection against bacteria

This study addresses the energy-intensive nature of conventional wastewater treatment processes and proposes a solution through the development of a green, low-energy, and multifunctional wastewater treatment technology. The research focuses on a multifunctional self-driven photoelectrocatalytic (PEC) system, exploring its four-in-one applications in eliminating organic pollutants, reducing U(VI), generating electrical energy, and disinfecting pathogenic microorganisms. A TiO2-decorated carbon felt (CF@TiO2) cathode is synthesized to enhance interfacial charge transfer, with TiO2 coating improving surface binding sites (edge TiO and adsorbed -OH) for UO22+ adsorption and reduction. The self-driven PEC system, illuminated solely with simulated sunlight, exhibits remarkable efficiency in removing nearly 100 % of uranium within 0.5 h and simultaneously degrading 99.9 % of sulfamethoxazole (SMX) within 1.5 h, all while generating a maximum power output density (Pmax) of approximately 1065 μW·cm−2. The system demonstrates significant anti-interference properties across a wide pH range and coexisting ions. Moreover, 49.4 % of the fixed uranium on the cathode is reduced into U(IV) species, limiting its migration. The self-driven PEC system also excels in detoxifying various toxic organic compounds, including tetracycline, chlortetracycline, and oxytetracycline, and exhibits exceptional sterilization ability by disinfecting nearly 100 % of Escherichia coli within 0.5 h. This work presents an energy-saving, sustainable, and easily recyclable wastewater purification system with four-in-one capabilities, relying solely on sunlight for operation.

Bacteria use a catabolic patchwork pathway of apparently recent origin for degradation of the synthetic buffer compound TRIS.

The synthetic buffer compound TRIS (2-amino-2-(hydroxymethyl)propane-1,3-diol) is used in countless applications, and no detailed information on its degradation has been published so far. Herein, we describe the discovery of a complete bacterial degradation pathway for TRIS. By serendipity, a Pseudomonas strain was isolated from sewage sludge that was able to grow with TRIS as only carbon and nitrogen source. Genome and transcriptome analyses revealed two adjacent gene clusters embedded in a mobile genetic element on a conjugative plasmid to be involved in TRIS degradation. Heterologous gene expression revealed cluster I to encode a TRIS uptake protein, a TRIS alcohol dehydrogenase, and a TRIS aldehyde dehydrogenase, catalyzing the oxidation of TRIS into 2-hydroxymethylserine. Gene cluster II encodes a methylserine hydroxymethyltransferase (mSHMT) and a d-serine dehydratase that plausibly catalyze the conversion of 2-hydroxymethylserine into pyruvate. Conjugational plasmid transfer into Pseudomonas putida KT2440 enabled this strain to grow with TRIS and with 2-hydromethylserine, demonstrating that the complete TRIS degradation pathway can be transmitted by horizontal gene transfer. Subsequent enrichments from wastewater purification systems led to the isolation of further TRIS-degrading bacteria from the Pseudomonas and Shinella genera carrying highly similar TRIS degradation gene clusters. Our data indicate that TRIS degradation evolved recently via gene recruitment and enzyme adaptation from multiple independent metabolic pathways, and database searches suggest that the TRIS degradation pathway is now globally distributed. Overall, our study illustrates how engineered environments can enhance the emergence of new microbial metabolic pathways in short evolutionary time scales.

High-affinity fluoride ions absorbent from TiO2-based ionic liquid pyridinium propylsulfonate

The development of materials for high efficiency removal of fluoride ions (F-) from sewage water remains a significant challenge. Unfortunately, traditional metal oxide adsorbents remove F-, but suffer from poor adsorption capacity and generate secondary pollution due to byproducts. To solve this problem, a highly-efficient and recyclable F- adsorbent with rich pore structure (BET specific surface area of 172.15 m2·g−1) was developed by multi-element doping strategy. The F- adsorbent was composed of TiO2 as substrate and ionic liquid pyridinium propylsulfonate as doping. This absorbent displayed good F- adsorption capacity (qmax = 224.11 mg∙g−1, 298 K), which operated through single molecule complex adsorption mechanism, outperformed many commercial adsorbents, and it also exhibited satisfactory adsorption kinetics for improving the efficiency of water treatment. Interestingly, the porous adsorbent had excellent regeneration potential (maintaining more than 70 % F- removal efficiency after 5 cycles of adsorption and desorption) and practical ability in complex water environments of tap water, lake and river. More importantly, a fixed-bed for F- adsorption was designed to simulate the equipment of sewage treatment plant. The breakthrough time and saturation time obtained by fixed-bed experiments proved the practical application value of this novel adsorbent. Most strikingly, the cost estimate showed that the economic feasibility and practical promotion potential of the renewable, continuous and efficient F- wastewater purification system using the novel absorbent were remarkable. This innovative approach showcases a viable solution for addressing F- removal and water treatment.

Green Energy Process "Ozonation" and Food Safety: A Comprehensive Review

Improving the storage life of food products is a major problem for manufacturers, and the food sector needs an "ecofriendly" alternative to present technology. As a disinfectant, ozone has been utilized in waste-water purification systems since the beginning of the century. Recently, ozone has been utilized to handle a wide variety of agricultural products because of its qualities, including fast disintegration and low residual consequences during food preservation. Ozone is an interesting substitute preservative that the food industry demands and a suitable decontaminator for guaranteeing the microbiological hygiene and safety of food products. Ozone treatment has been demonstrated to be a potential strategy for lowering pollutants in dairy effluents. This review comprehensively highlights ozonation as a preservative in dairy, fruits and vegetables, poultry, cereals, and fresh produce in depth for save and effective use of ozone, whereas other published articles only discuss one of these categories. Overall, ozone has proven to be a viable technique, despite its high food-preservation efficacy, and market certification requires extensive information on the applicability of ozone-based technologies and their potential benefits

Çevre Dostu Karbon Nano Fiberlerin Kimyasal Buhar Biriktirme Tekniği Kullanılarak Metanol ile Sentezlenmesi

This study aims to investigate the suitability of methanol as a carbon source for the synthesis of carbon nanofibres (CNFs), currently used in wastewater, water, and air purification systems, by chemical vapor deposition (CVD) in the presence of NiO catalyst. Experimental studies were carried out in a tube furnace under isothermal conditions. Catalyst particles were loaded onto silicon wafers with orientation by dip coating to grow CNFs. The reduction behavior of nickel oxide powder at 1000 K under non-isothermal and isothermal conditions was investigated before CNF synthesis studies. The percentage reduction of nickel oxide powder under non-isothermal conditions was 82.03%. The percentage reduction under isothermal conditions for 30 min was 78.03%. The experimental result obtained is very close to the theoretical value (78.57%). During CNF synthesis experiments, it was observed that CNF formation was not achieved at temperatures of 1000 - 1100 K due to the poor thermal decomposition of methanol. Pyrolysis of methanol increased with increasing synthesis temperature (1200 K), which promoted the synthesis of CNFs. SEM analysis revealed morphologically dense CNF formation under isothermal conditions for 20 min at 1300K synthesis temperature.

Revolutionizing Water Sustainability: A Comprehensive Exploration of Zero Liquid Discharge Strategies

Sustainable water management practices have become increasingly important in the face of escalating global water scarcity. ZLD is emerging as a promising solution to eliminate liquid discharge from wastewater treatment and purification systems. It highlights the pivotal role ZLD plays in advancing sustainable water management by examining its principles, technologies, and applications. With a comprehensive assessment of ZLD technologies, a nuanced understanding of their diverse tools is provided through membrane processes, evaporation, crystallization, and biological treatment. As well as emphasizing ZLD's adaptability and effectiveness, the review points out successful applications across industries. Water scarcity can be addressed by repurposing wastewater as a resource, thus aligning with circular economy principles and advocating wide adoption of the technology in future water management plans.

Establishment of technologically feasible modes of electrocoagulation purification of wastewater from nickel ions

The object of research is the technology of electrochemical purification of wastewater from heavy metal ions. The work, in particular, is devoted to the purification of effluents with a low concentration of the Nickel ion. The main task of the experimental research was to select the material of the electrodes and the mode of electrochemical dissolution of the anodes, under which the efficiency of wastewater purification will be maximum, as well as to confirm the practical possibility of deep purification of the specified wastewater to the standards that correspond to the maximum permissible concentrations (MPCNi=0.5 mg/dm3). It was established that in the process of electrocoagulation wastewater purification there is an induction period (10 min), during which the coagulant accumulates in the electrolyzer and the degree of purification increases sharply. As a result of an increase in the current density from 10 A/m2 to 20 A/m2, the degree of purification on iron electrodes increased from 60 to 84% for a process duration of 20 minutes. This is explained by the intensification of the anodic dissolution of the metal and the increase in the concentration of Fe(OH)3. Increasing the current density to 30 A/m2 practically does not affect the degree of purification, which is explained by the phenomenon of polarization of the anodes and is confirmed by the increase in the process voltage from 2.40 V (10 A/m2) to 12.59 V (30 A/m2). Therefore, it is impractical to increase the current density in the future. For iron anodes, it was not possible to achieve the required degree of purification (≥98.3 %), the maximum degree of purification did not exceed 85 %, and the content of Ni2+ ions in purified water exceeds the MPC by an order of magnitude. It was experimentally established that it is advisable to use aluminum electrodes for the process of electrocoagulation purification of wastewater from Nickel ions. At a current density of 20 A/m 2 and process duration of 40 minutes, the concentration of Ni2+ ions did not exceed the MPC of Ni. When using aluminum electrodes, an increase in the current density from 15 A/m2 to 20 A/m2 does not lead to polarization of the electrodes, and the process in both cases takes place at a steady state at a voltage of ~6.7 V. The technologically appropriate operating mode of the electrolyzer is chosen: aluminum electrodes at an anodic current density 20 A/m2 and the duration of the purification process – ≥40 min. The obtained results can find practical use in the design of waste water purification systems of galvanic industries.

Research on optimization test of electrode material in desulfurization wastewater purification system of coal-fired power plant

The traditional coal-fired power plant wastewater treatment technology is faced with the problems of complex system, high operating cost, easy scaling and corrosion, etc. Therefore, coal-fired power plants need to adopt an integrated multi-functional coupling system, taking into account the desalination, anti-scaling, etc. function to remove pollutants from wastewater. Electro-adsorption technology is a technology that can realize water purification and water desalination. It is a new type of water treatment technology. It can effectively remove impurity ions in water without scaling under the premise of low energy consumption. In this paper, the development history of electrosorption theory, the principle of electrosorption, the main points of electric double layer theory, the structure of electrosorption and its working process are reviewed. Several main electrode materials and their advantages and disadvantages are introduced in this paper. Based on the increasingly stringent environmental protection requirements, electro-adsorption technology is expected to be widely used in the power industry due to its advantages of low energy consumption, low cost, and no secondary pollution.

GO-CNT/AgI nanocomposites: A facile synthesis and environmentally friendly method to removal of organic pollutants

The sheets of graphene oxide (GO) were sonicated, linked with carbon nanotubes (CNTs), and doped with AgI (G-CNT/AgI). X-ray diffraction studies reveal that the crystalline nature of nanocomposites diminishes as the carbon content rises. Analyses using SEM and TEM reveal that the shape and size of the materials are cubic and 20 nm. The EDX analysis revealed that the samples included solely Ag, I, and Carbon. The material's UV–vis absorption spectra result in significant absorption bands that may be seen at 420 nm. After loading G-CNTs into the AgI, the absorption range grew a little, which shows that the G-CNTs are excellent for the nanocomposite's ability to absorb light. To evaluate the performance of the component, the Methylene blue (MB) dye solution was deteriorated. Within 90 min, the degradation was nearly finished. Due to the formation of a heterojunction between AgI and G-CNT and the subsequent separation of charge carriers, the G-CNT/AgI nanocomposite exhibited exceptional photocatalytic stability after four cycles. As a result, the innovative G-CNT/AgI photocatalyst was a potential component of the waste water purification system.

Self-powered wastewater purification and phosphorus recovery systems with novel self-filtering Al-air batteries

Sustainable water treatment systems are crucial for water recycling and resource recovery. However, the existing self-powered water treatment technology for metal-air batteries has several challenges. This study proposed a new self-powered water treatment system concept by developing self-filtering aluminum-air (SF Al-air) batteries. The sandwich-shaped flexible air cell comprised an aluminum (Al) scrap anode, an inexpensive hydrophilic separator, and a graphite-coated titanium mesh cathode. By utilizing the capillary action and porous structure of the separator, the autonomous flow and filtration of electrolytes or wastewater were achieved inside the battery. Owing to the high Al purity of 95 % and the ultra-thin structure, the low-cost kitchen Al foil is a promising anode, with the highest power density of 23.02 mW g−1 (anode weight), 4.60 × 10−2 W $−1 (anode cost). Kitchen paper is the preferred separator facilitating electrolyte transfer and automatic renewal inside the battery owing to the strong water storage property. The SF Al-air cell can also efficiently removed 90% of phosphorus at an initial concentration of 100 mg P/L and initial pH = 7. Specifically, the cell converted phosphate pollutants and Al foil waste into a valuable AlPO4·2H2O flame retardant coating on kitchen paper, resulting in a first-class flame retardancy of the separators. Lake water treatment results showed that the self-powered SF-Al-air cell purified real surface water and obtained a stable power production of 146.7 mW g−1. Our study demonstrates a promising sustainable water treatment technology for simultaneous power generation, wastewater purification, phosphorus recovery, and waste Al disposal.

Carbon-based nanomaterial intervention and efficient removal of various contaminants from effluents – A review

Water treatment is a worldwide issue. This review aims to present current problems and future challenges in water treatments with the existing methodologies. Carbon nanotube production, characterization, and prospective uses have been the subject of considerable and rigorous research around the world. They have a large number of technical uses because of their distinct physical characteristics. Various catalyst materials are used to make carbon nanotubes. This review's primary focus is on integrated and single-treatment technologies for all kinds of drinking water resources, including ground and surface water. Inorganic non-metallic matter, heavy metals, natural organic matter, endocrine-disrupting chemicals, disinfection by-products and microbiological pollutants are among the contaminants that these treatment systems can remediate in polluted drinking water resources. Significant advances in the antibacterial and adsorption capabilities of carbon-based nanomaterials have opened up new options for excluding organic/inorganic and biological contaminants from drinking water in recent years. The advancements in multifunctional nanocomposites synthesis pave the possibility for their use in enhanced wastewater purification system design. The adsorptive and antibacterial characteristics of six main kinds of carbon nanomaterials are single-walled carbon nanotubes, multi-walled carbon nanotubes, graphene, graphene oxide, fullerene and single-walled carbon nanohorns. This review potentially addressed the essential metallic and polymeric nanocomposites, are described and compared. Barriers to use these nanoparticles in long-term water treatment are also discussed.

Physiology of microalgae and their application to sustainable agriculture: A mini-review.

Concern that depletion of fertilizer feedstocks, which are a finite mineral resource, threatens agricultural sustainability has driven the exploration of sustainable methods of soil fertilization. Given that microalgae, which are unicellular photosynthetic organisms, can take up nutrients efficiently from water systems, their application in a biological wastewater purification system followed by the use of their biomass as a fertilizer alternative has attracted attention. Such applications of microalgae would contribute to the accelerated recycling of nutrients from wastewater to farmland. Many previous reports have provided information on the physiological characteristics of microalgae that support their utility. In this review, we focus on recent achievements of studies on microalgal physiology and relevant applications and outline the prospects for the contribution of microalgae to the establishment of sustainable agricultural practices.

Development of modified pyrophyllite carbon paste electrode for carbendazim detection

ABSTRACT This study aims to design the pyrophyllite-adapted carbon paste electrode (pCPE) and test it for potential use in wastewater purification systems. Structural characterization of pure pyrophyllite ore and mechanically modified pyrophyllite in mortar and pestle has been followed by XRD, SEM, PSA, and FTIR. Electrochemical characteristics were studied by cyclic voltammetry of pyrophyllite CPE in sulfuric acid and potassium ferrocyanide, as redox model compounds. Delamination, gliding, and folding of the layers and a decrease in particle and crystallite size have been observed, leading to the excellent electrocatalytic activity of pCPE. The developed pCPE has numerous benefits such as a simple preparation method, rapid response, and good sensitivity. The oxidation peak of carbendazim appears in Britton-Robinson buffer solutions (pH 4) at +0.9 V vs. Ag/AgCl. The developed method is linear in the concentration range of 3.2–29.2 ng cm−3, with r = 0.999 and the limit of detection of 1.9 ng cm−3.

Mg-Al Layered Double Hydroxide Doped Activated Carbon Composites for Phosphate Removal from Synthetic Water: Adsorption and Thermodynamics Studies

Increased phosphate concentration in water bodies has led to eutrophication, and its removal is an inevitable requirement of sustainable wastewater purification systems. In this study, MgAl layered doubled hydroxide (LDH) composites doped on the surface of activated carbon (AC/MgAl LDH) with various (Mg + Al) total metal loading (5 wt%, 10 wt%, and 15 wt%) were prepared by the co-precipitation method. The influence of (Mg + Al) total metal loading onto AC was examined to remove phosphate ions from aqueous solutions. The effect of adsorption parameters, including adsorbent dosage, initial solution pH, initial phosphate concentration, contact time, and experiment temperature, were investigated via batch adsorption experiments. The adsorption results demonstrated that the phosphate adsorption capacity significantly improved with increasing the (Mg + Al) metal loading on the surface of AC. The maximum Langmuir phosphate adsorption capacity was 337.2 mg phosphate per gram of AC/MgAl-3 LDH composite (15 wt% Mg + Al) composite at pH ~6.3, 22 °C, and 1 g/L of adsorbent. The kinetic data were best fitted with the pseudo-second order model. The initial solution pH notably influenced the phosphate removal by AC/MgAl-3 LDH composite with a maximum removal at pH 2.3. According to the spent adsorbent characterization results, the dominant mechanisms of phosphate removal by AC/MgAl-3 LDH were electrostatic interactions, ion exchange, and inner-sphere complexation. The phosphate adsorption capacity was gradually increased with increasing the experiment temperature, suggesting an endothermic adsorption process. Overall, the AC/MgAl LDH composites pave the way for an effective strategy for phosphate removal from aqueous solutions.

Application of pulse-modulated radio-frequency atmospheric pressure glow discharge for degradation of doxycycline from a flowing liquid solution.

Doxycycline (DOX), an antibiotic commonly used in medicine and veterinary, is frequently detected in natural waterways. Exposition of bacteria to DOX residuals poses a selective pressure leading to a common occurrence of DOX-resistance genetic determinants among microorganisms, including virulent human pathogens. In view of diminishment of the available therapeutic options, we developed a continuous-flow reaction-discharge system generating pulse-modulated radio-frequency atmospheric pressure glow discharge (pm-rf-APGD) intended for DOX removal from liquid solutions. A Design of Experiment and a Response Surface Methodology were implemented in the optimisation procedure. The removal efficiency of DOX equalling 79 ± 4.5% and the resultant degradation products were identified by High-Performance Liquid Chromatography–Diode Array Detection, Liquid Chromatography Quadruple Time of Flight Mass Spectrometry, Ultraperformance Liquid Chromatography–Tandem Mass Spectrometry, total organic carbon, total nitrogen, Attenuated Total Reflectance Furrier Transform–Infrared, and UV/Vis-based methods. The pm-rf-APGD-treated DOX solution due to the generated Reactive Oxygen and Nitrogen Species either lost its antimicrobial properties towards Escherichia coli ATCC25922 or significantly decreased biocidal activities by 37% and 29% in relation to Staphylococcus haemolyticus ATCC29970 and Staphylococcus aureus ATCC25904, respectively. Future implementation of this efficient and eco-friendly antibiotic-degradation technology into wastewater purification systems is predicted.

Calixarene-tethered textile fabric for the efficient removal of hexavalent chromium from polluted water

This study describes the tethering of dimethylamionomethyl bonded calixarene (DMAM-calixarene) onto cotton fabric surface functionalized with poly(glycidyl methacrylate) (PGMA) linker layer using initiated chemical vapor deposition (iCVD) technique and the efficient adsorption capability of DMAM-calixarene functional textiles for the toxic hexavalent chromium from polluted water. The characterization of DMAM-calixarene-tethered textile fabric was performed by FTIR and XPS spectroscopy. Cr(VI) solutions was passed over packed DMAM-calixarene-tethered textile fabric adsorbent and the highest adsorption was observed at pH 2 in dichromate anion form of COS. The regeneration and selectivity studies indicate that the DMAM-calixarene-tethered textile fabric has outstanding adsorbent features in used experimental conditions for hexavalent chromium. Moreover, it was observed that both H-bonding and electrostatic interactions were significant factors in the dichromate anion adsorption process. Thus, this study clearly revealed that any DMAM-calixarene-tethered textile fabric can be easily used as a selective hexavalent chromium capture filter in geographic regions lacking appropriate wastewater purification systems.

High-Efficiency Wastewater Purification System Based on Coupled Photoelectric–Catalytic Action Provided by Triboelectric Nanogenerator

HighlightsTriboelectric nanogenerator (TENG)/carbon dots-TNs supported over three-dimensional graphene aerogel (3DGA@CDs-TNs) system was constructed.TENG and 3DGA@CDs-TNs present excellent degradation activity toward brilliant green (88.26%, 40 min) and direct blue 5B (89.6%, 90 min).The coupling interaction of photocatalysis and TENG leads to an enhanced removal ability.The degradation pathways for brilliant green and direct blue 5B are proposed.

Metagenomic insights into the profile of antibiotic resistomes in sediments of aquaculture wastewater treatment system

To meet the rapidly growing global demand for aquaculture products, large amounts of antibiotics were used in aquaculture, which might accelerate the evolution of antibiotic-resistant bacteria (ARB) and the propagation of antibiotic genes (ARGs). In our research, we revealed the ARGs profiles, their co-occurrence with mobile genetic elements (MGEs), and potential hosts in sediments of a crab pond wastewater purification system based on metagenomic analysis. The residual antibiotic seems to increase the propagation of ARGs in the crab pond, but there was no clear relationship between a given antibiotic type and the corresponding resistance genes. The effect of aquaculture on sediment was not as profound as that of other anthropogentic activities, but increased the relative abundance of sulfonamide resistance gene. A higher abundance of MGEs, especially plasmid, increased the potential ARGs dissemination risk in crab and purification ponds. Multidrug and sulfonamide resistance genes had greater potential to transfer because they were more frequently carried by MGEs. The horizontal gene transfer was likely to occur among a variety of microorganisms, and various ARGs hosts including Pseudomonas, Acinetobacter, Escherichia, and Klebsiella were identified. Bacterial community influenced the composition of ARG hosts, and Proteobacteria was the predominant hosts. Overall, our study provides novel insights into the environmental risk of ARGs in sediments of aquaculture wastewater treatment system.