Water
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2020
·Vol. 12
·期 2
·595
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IF 2.544
Gaogui Jing,Shuai Ren,Yuesheng Gao,Wei Sun,Zhiyong Gao
Mineral processing wastewater contains large amounts of reagents which can lead to severe environmental problems, such as high chemical oxygen demand (COD). Inspired by the wastewater treatment in such industries as those of textiles, food, and petrochemistry, in the present work, electrocoagulation (EC) is applied for the first time to explore its feasibility in the treatment of wastewater with an initial COD of 424.29 mg/L from a Pb/Zn sulfide mineral flotation plant and its effect on water reuse. Typical parameters, such as anode materials, current density, initial pH, and additives, were characterized to evaluate the performance of the EC method. The results showed that, under optimal conditions, i.e., iron anode, pH 7.1, electrolysis time 70 min, 19.23 mA/cm2current density, and 4.1 g/L activated carbon, the initial COD can be reduced to 72.9 mg/L, corresponding to a removal rate of 82.8%. In addition, compared with the untreated wastewater, EC-treated wastewater was found to benefit the recovery of galena and sphalerite, with galena recovery increasing from 25.01% to 36.06% and sphalerite recovery increasing from 59.99% to 65.33%. This study confirmed that EC is a promising method for the treatment and reuse of high-COD-containing wastewater in the mining industry, and it possesses great potential for wide industrial applications.Keywords:mineral processing;wastewater treatment;flotation;electrocoagulation (EC);chemical oxygen demand (COD)
研究领域:
环境科学
·
矿业工程
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Jingde Ma,Haizhen Wu,Yixian Wang,Guanglei Qiu,Bingbing Fu,Chaofei Wu,Chaohai Wei
For wastewaters containing high strength sulfide and nitrogen (e.g. coking wastewater), sulfide might be precipitated and recovered using ferrous salt. This study systematically investigated the feasibility of recovered and precipitated FeS (comparing to commercial FeS minerals) to support autotrophic denitrification for advance nitrogen removal from bio-treated coking wastewater in fluidized bed reactors. The reactor with precipitated FeS could achieve simultaneous removal of NO 3 − -N and inert COD with high efficiencies of around 96.3% and 30.5%, at NO 3 − -N and COD loading rates of 4.18 mg·L −1 ·h −1 and 8.06 mg·L −1 ·h −1 , respectively. Whereas, the performance of commercial FeS reduced gradually and irreversibly after two days, which became completely ineffective after 40 days. Thiobacillus and Rhodanobacter dominated the biomass, which played a key role in the FeS-based denitrification process. This material inter-recycling concept benefits an advance and more sustainable treatment of wastewaters with high strength sulfide and nitrogen.
研究领域:
环境工程
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水处理
·
微生物学
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DOI
PubMed
高影响因子
Green Chemical Engineering
·
2024
·
IF 9.1
Enze Li,Jing Dong,Yongsheng Jia,Zihe Pan,Hongzhou Lv,Zhiping Du,Guandao Gao,Fangqin Cheng
Sufficient treatment of industrial organic wastewater with high salt and large amounts of suspended particulate matter remains a challenge worldwide. In this work, a novel coagulation-flotation combined process was developed to treat the suspended particles as well as significantly reduce organic pollutants content in the actual high-salt organic wastewater. Four typical inorganic and organic flocculants (poly aluminum chloride (PAC), poly ferric sulfate (PFS), polyacrylamide (PAM), and modified cationic starch (CS)) were selected for compounding to obtain an optimized flocculation system for high-salt wastewater. The results showed that the PAC-PAM with a 10:1 ratio in mass exhibited the best coagulation behaviors with the removal efficiency of turbidity and chemical oxygen demand (COD) being 95.33% and 9.21%, respectively, under the optimal operation conditions, and the sedimentation process of coagulant conformed to the quasi-second-order kinetics. The PAC-PAM flocs exhibited stronger netting, sweeping, and adsorption bridging capabilities, which were conducive to removing suspended particles. When the flotation was conducted after coagulation, the COD decreased significantly by 20.82%. In addition, this combined process could reduce the treatment time by 50% compared to the process with only coagulation treatment. During the flotation process, floc particles companies with hydrophobic polycyclic aromatic hydrocarbons could collide and adhere to microbubbles and be floated to the surface, resulting in an effective reduction of COD. This work could provide a novel strategy and step forward to design and optimize the pretreatment process engineering for organic high-salt wastewater.
研究领域:
环境工程
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废水处理
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化学工程
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Mingwei Wang,Ye Sun,Qilin Yu,Zhiqiang Zhao,Yang Li,Yaobin Zhang
Fenton sludge generated in the flocculation stage of the Fenton oxidation process contains significant amounts of ferric iron and organic pollutants , which require proper treatment. Previous studies have demonstrated that adding Fenton sludge to an anaerobic digester can decompose some of the organic pollutants in the Fenton sludge to lower its environmental risk, but iron gradually accumulates in the reactor, which weakens the sustainability of the method. In this study, Fenton sludge was introduced into a hydrolytic acidification reactor with a weak acid environment to relieve the iron accumulation as well as improve the degradation of organic matter. The results showed that the added Fenton sludge acted as an extracellular electron acceptor to induce dissimilatory iron reduction, which increased chemical oxygen demand (COD) removal and acidification efficiency by 16.1% and 19.8%, respectively, compared to the group without Fenton sludge. Along with the operation, more than 90% of the Fe(III) in Fenton sludge was reduced to Fe(II), and part of them was released to the effluent. Moreover, the Fe(II) in the effluent could be used as flocculants and Fenton reagents to further decrease the effluent COD by 29.8% and 44.5%, respectively. It provided a sustainable strategy to reuse Fenton sludge to enhance organic degradation based on the iron cycle.
研究领域:
环境工程
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废物管理
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水处理
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生物技术
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DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2020
·
IF 4.762
Jiayao Li,Weifeng Song,Zefeng Yu,Qiuhua Li
The quality of dairy farming wastewater in different regions is particular and different. In Southern China, the Chemical Oxygen Demand (COD Cr ) and colourity of effluent from conventional dairy farming wastewater treatment processes are similar. Catalytic ozonation is a very promising technical method. In this paper, the Mn-Fe-Ce/γ-Al 2 O 3 catalyst was prepared via the optimized preparation method of impregnation roasting using γ-Al 2 O 3 as the carrier, and this catalyst was used in the ozonation of actual dairy farming wastewater from treatment facilities. The performance of the Mn-Fe-Ce/γ-Al 2 O 3 catalyst on dairy farming wastewater was investigated using a simulated dynamic test. The effects of the reaction time, pH and catalyst dosage on COD Cr and the colourity removal ratio were investigated. The results show that the optimum treatment conditions were a reaction time of 20 min, pH 9, and catalyst dosage of 15 g/L. The COD Cr removal ratio reached 48.9% and the colourity was 95% under the optimum conditions. BOD 5 /COD Cr increased from 0.21 to 0.54 after catalytic ozonation, indicating that the biodegradability of wastewater was significantly improved. This research provides a new method and theoretical guidance for dairy farming wastewater treatment.
研究领域:
环境工程
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废水处理
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催化
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DOI
高影响因子
Engineering
·
2025
·
IF 11.6
Bin Zhao,Jialin Yang,Ruiping Liu,Jiuhui Qu,Meng Sun
The contamination of wastewater with organic pollutants and nitrogen compounds poses significant environmental challenges. The primary objective of wastewater treatment is the simultaneous denitrification and decarbonization of ammonia nitrogen into harmless by-products. This study presents a novel method for the directional generation of chlorine radical species like ·ClO and ·Cl using electro-reactive membranes (EMs), which were fabricated using an electro-deposition coupled template approach known as RuO 2 @PbO 2 -M. This method facilitates the rapid and efficient conversion of ammonia to nitrogen and concurrently reduces the chemical oxygen demand in the effluent. Our system achieved ultra-efficient simultaneous denitrification and decarbonization with minimal energy consumption in single-filtration mode, thereby eliminating the need for chemical precursors. We elucidate the formation pathway of ·ClO and ·Cl during the electrochemical oxidation process involving RuO 2 @PbO 2 -M, where ·Cl generated from RuO 2 reacts with ·OH from PbO 2 under hypochlorous acid conditions, thereby enhancing nitrogen and carbon removal. These findings highlight a novel filtration model that utilizes single-channel electro-filtration and an innovative reactive membrane design for ·ClO synthesis, which provides a new research framework for the concurrent removal of nitrogen and carbon, and offers a promising solution to enhance wastewater treatment efficiency.
研究领域:
环境科学
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水处理技术
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电化学
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膜科学
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化学工程
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可持续废水管理
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2020
·
IF 7.864
Wenxiao Zheng,Liuyi Zhu,Sheng Liang,Jinshao Ye,Xin Yang,Zhenchao Lei,Zhang Yan,Yongdong Li,Chaohai Wei,Chunhua Feng
Inorganic constituents in real wastewater, such as halides and carbonates/bicarbonates, may have negative effects on the performance of electrochemical systems because of their capability of quenching HO•. However, we discovered that the presence of Cl– and HCO3– in an electrochemical system is conducive to the formation of ClO•, which plays an important role in promoting the simultaneous elimination of biorefractory organics and nitrogen in secondary coking wastewater effluent. The 6-h operation of the coupled electrochemical system (an undivided electrolytic cell with a PbO2/Ti anode and a Cu/Zn cathode) at a current density of 37.5 mA cm–2 allowed the removal of 87.8% of chemical oxygen demand (COD) and 86.5% of total nitrogen. The electron paramagnetic resonance results suggested the formation of ClO• in the system, and the probe experiments confirmed the predominance of ClO•, whose steady-state concentrations (8.08 × 10–13 M) were 16.4, 26.5, and 1609.5 times those of Cl2•– (4.92 × 10–14 M), HO• (3.05 × 10–14 M), and Cl• (5.02 × 10–16 M), respectively. The rate constant of COD removal and the Faradaic efficiency of anodic oxidation obtained with Cl– and HCO3– was linearly proportional to the natural logarithm of the ClO• concentration, and the specific energy consumption was inversely correlated to it, demonstrating the crucial role of ClO• in pollutant removal.
研究领域:
环境工程
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水处理
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电化学
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
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2025
·
IF 10
Lizheng Yang,Jiayang Lin,Jiayang Mo,Yingxin Wang,Chenhao Liang,Yanbo Chen,Qilun Huang,Dongying Hu,Xiurong Li
Heterogeneous electro-Fenton is a promising wastewater treatment technology that can efficiently degrade organic pollutants without secondary pollution. However, challenges persist in developing streamlined synthesis methods for high-performance, cost-effective cathode catalysts. Herein, hierarchical iron phosphides@hard carbon composites with porous heterostructures were engineered through a synergistic approach involving high-temperature calcination, chemical activation, and iron phosphide doping. It features effective doping of FeP nanoparticles, a relatively high specific surface area, and abundant catalytically active sites. The optimal catalyst achieved 95.4 % phenol degradation within 180 min under neutral conditions, coupled with 61.4 % chemical oxygen demand (COD) removal. Notably, the system maintained 90.0 % phenol removal efficiency over 20 recycling times, far exceeding some reported cathodes. A key advancement lies in the catalyst's broad pH adaptability (pH 3–9), effectively eliminating the stringent pH limitations (typically pH 2–4) inherent to traditional homogeneous electro-Fenton systems. The superior performance of the composite catalyst demonstrates the viability of biomass-derived hard carbon for wastewater treatment and offers a novel reference for its application in the realm of electro-Fenton degradation.
研究领域:
环境科学
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材料科学
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电化学
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水处理技术
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2025
·
IF 6.3
Chao Zhu,Yiruo Huang,Ze Ding,Zarak Mahmood,Xingang Kong,Hongrui Ma,Xianbao Wang
Coking wastewater, characterized by high biological toxicity, poses significant challenges for traditional biological treatment methods. This study developed a novel in-situ immobilized photocatalytic-algae-bacteria consortia (P-ABC) system using a polyether polyurethane sponge as a carrier, aiming to enhance biological treatment efficiency for actual coking wastewater. Results showed a 16.8 % increase in algal density (up to 1.51 × 10⁵ cells/mL) in the P-ABC system compared to non-coupled controls, with significantly improved microbial metabolic activity, confirming the carrier's exceptional biocompatibility. Compared to standalone algae-bacteria consortia systems, the P-ABC system achieved higher removal efficiencies for chemical oxygen demand (COD Cr , 19.8 %), total organic carbon (TOC, 21.2 %), and total nitrogen (TN, 30.4 %). These findings validate the system's potential for improving stable and efficient treatment of industrial wastewater. Furthermore, this study offers insights into bio-enhanced treatment technologies and provides a reference pathway for integrating advanced oxidation and biological processes.
研究领域:
环境工程
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废水处理
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生物技术
·
光催化
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 2
·987-994
·
IF 3.84
Zhijun Li,Qi Yang,Yu Zhong,Xiaoming Li,Li Zhou,Xin Li,Guangming Zeng
In this study, Fe(II)-loaded granular activated carbon (GAC) was used as a heterogeneous persulfate catalyst for the pretreatment of mature landfill leachate. The effects of Fe2+ dosage, persulfate concentration and initial pH on the degradation of the organic pollutants in the landfill leachate were investigated. In single factor experiments, the maximum Chemical Oxygen Demand (COD) removal rate reached 66.8, 66.2 and 76.3% at an Fe2+ dosage of 127 mg L−1 (Fe2+/S2O82− = 254 mg mol−1), a persulfate concentration of 0.5 mol L−1 (i.e. S2O82− : 12COD0 = 1.08) and an initial pH of 3, respectively. Obviously, pH played a more important role in the persulfate oxidation treatment than the other two factors. The synthetic experimental results showed that the COD removal rate exceeded 87.8% when the reaction conditions had a controlled Fe2+ dosage of 127 mg L−1, persulfate concentration of 0.5 mol L−1 and initial pH of 3.0, simultaneously. The recycle experiments displayed that the catalytic ability of reused Fe(II)-GAC declined considerably and the COD removal rate dropped by approximately half after reusing three times. But the catalytic ability of the catalyst used could be well recovered after regeneration at 550 °C in a N2 atmosphere. Finally, fluorescence excitation–emission matrix (EEM) spectroscopy preliminarily explained the degradation mechanism of the landfill leachate.
研究领域:
环境工程
·
废物管理
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水处理
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DOI
高影响因子
AQUACULTURE
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2023
·
IF 4.5
Tingting Ye,Min Li,Yuanbin Lin,Zengjian Su
Aquaculture has expanded significantly in recent years, and the effluent it produces has had a significant negative impact on the environment. The survival and growth rates of aquaculture products may impact by the eutrophication of the water body if the effluent from aquaculture is not handled. In this study, chitosan-based aerogel was used as a carrier to immobilize the degrading bacteria, and the adsorption capacity of the carrier material for methyl blue was 1.30 mg·g −1 . The Caulerpa lentillifera was added to the shrimp tank at the same time as a biofilter , and a composite in-situ treatment system using microbes and macroalgae was built to handle the effluent from the mariculture industry to test the reduction rates of the nutrients from the wastewater. The outcomes demonstrated that the immobilized bacteria used had reduction rates of COD , NH 4 + and NO 2 − in wastewater that were 48.82%, 9.14% and 40.74% greater than those of the free bacteria, respectively. The reduction effect of macroalgae for nutrients in wastewater is also very ideal, in which the reduction rates of TP and TN reach 32.43% and 74.94% respectively. When the immobilized degrading bacteria and macroalgae are combined, the reduction rates of COD, TN and TP in water reach 68.61%, 59.03% and 34.25%. At the same time, the survival rate of shrimp and the biomass of macroalgae have increased to a positive extent, with increases of 12.5% and 140%, respectively. These results demonstrate that the introduction of immobilized degrading bacteria and macroalgae into the shrimp culture system can effectively reduce the accumulation of nutrients in the shrimp culture system and have a positive impact in a variety of ways.
研究领域:
环境科学
·
水产养殖
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废水处理
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生物技术
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产品关联
DOI
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2018
·Vol. 187
·期 4
·1488-1501
·
IF 1.797
Sun Zhong-liang,Sun Li-qin,Chen Guo-zhong
This work investigated the cultivation of Chlorella vulgaris in a thin-film flat plate photobioreactor under outdoor conditions and using digested piggery wastewater as the culture medium. The algal cells were able to adapt quickly to the wastewater and outdoor conditions. A specific growth rate of 0.12 day −1 was obtained in the exponential growth phase, which was slightly higher than that during indoor cultivation using artificial culture medium. Results showed that Chlorella vulgaris effectively removed TN, TP, and COD by 72.48%, 86.93%, and 85.94%. Due to the difference in culture conditions and phosphorus availability, the biomass from outdoor cultivation contained higher lipid content and more unsaturated fatty acids compared to indoor cultures, while the amino acid composition was unaffected. Results of metallic element assay indicated that the biomass cultured with wastewater conformed to the standards required for animal feed additive production. The overall cost of the biomass production in the thin-film flat plate photobioreactor (32.94 US$/kg) was estimated to be 4.67 times lower than that of indoor cultivation (154.04 US$/kg). Together, these results provide a basis for large-scale outdoor production of microalgae and wastewater bioremediation.
研究领域:
环境工程
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生物技术
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废水处理
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藻类生物技术
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）