CHEMOSPHERE
·
2022
·
IF 8.943
Jianlong Wang,Shizong Wang,Chuanhong Chen,Jun Hu,Shijun He,Yuedong Zhou,Huanzheng Zhu,Xipo Wang,Dongming Hu,Jian Lin
The effective treatment of hospital sewage is crucial to human health and eco-environment, especially during the pandemic of COVID-19. In this study, a demonstration project of actual hospital sewage using electron beam technology was established as advanced treatment process during the outbreak of COVID-19 pandemic in Hubei, China in July 2020. The results indicated that electron beam radiation could effectively remove COD, pathogenic bacteria and viruses in hospital sewage. The continuous monitoring date showed that the effluent COD concentration after electron beam treatment was stably below 30 mg/L, and the concentration of fecal Escherichia coli was below 50 MPN/L, when the absorbed dose was 4 kGy. Electron beam radiation was also an effective method for inactivating viruses. Compared to the inactivation of fecal Escherichia coli , higher absorbed dose was required for the inactivation of virus. Absorbed dose had different effect on the removal of virus. When the absorbed dose ranged from 30 to 50 kGy, Hepatitis A virus (HAV) and Astrovirus (ASV) could be completely removed by electron beam treatment. For Rotavirus (RV) and Enterovirus (EV) virus, the removal efficiency firstly increased and then decreased. The maximum removal efficiency of RV and EV was 98.90% and 88.49%, respectively. For the Norovirus (NVLII) virus, the maximum removal efficiency was 81.58%. This study firstly reported the performance of electron beam in the removal of COD, fecal Escherichia coli and virus in the actual hospital sewage, which would provide useful information for the application of electron beam technology in the treatment of hospital sewage.
研究领域:
环境科学
·
生物学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2020
·Vol. 12
·期 2
·595
·
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
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Zhonghua Wang,Hui Qiao,Zhongchen Yu,Xue Yang,Ziyu Tang,Wei Zhou,Haiqian Zhao
The H 2 O 2 , O 2 − , OH, and HO 2 generated by the anode and cathode are considered the possible sources of the oxidizing power of the electro-Fenton system. For improving the current efficiency, the assessment of the degradability of anode and various active substances to pollutants is an important prerequisite. The COD removal ratio was used as a judgment index for the first time, and the effect of various active substances produced by the electro-Fenton anode and cathode on the removal of COD in benzene-containing wastewater was analyzed. The results revealed that the contribution rate of the active substances produced by the cathode for the COD removal is 63.21%. Among the active substances, the contribution rate of OH, which is the most important active substance, is 58.86%. The contribution rate of the anode is 36.79%. The COD removal ratio of the system is considered the best when I = 200 mA, pH = 3, and [FeSO 4 ] 0 = 60 mg/L, which is estimated as 72.59%. The contribution rate of OH, which is produced by the cathode, to the removal of COD is positively correlated with the total COD removal ratio. These findings are of great significance. That is only by improving the utilization rate of OH and reducing the ineffective consumption of OH, the removal of COD can be promoted, and the bottleneck problem of low electro-Fenton current efficiency can be solved.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Liheng Liu,Dongwei He,Fei Pan,Rong Huang,Hua Lin,Xuehong Zhang
In this study, Fe/Cu, Fe/Al/Cu, Fe/Cu/C and Fe/Al/Cu/C internal electrolysis systems (IESs) were constructed and used to treat methylene blue dye (MB) wastewater. The effects of filler mass ratio, filler dosage, solution pH, reaction time and reaction temperature on COD removal were discussed, while the kinetics, thermodynamics and mechanism of COD removal were also investigated. The results showed that when the COD removal rates were basically the same, the reaction times of Fe/Al/Cu, Fe/Cu/C and Fe/Al/Cu/C IESs were shorter, and the filler dosages were lower. For the four systems, the appropriate pH was around 5, while the suitable reaction temperature was in the range of 20–25 °C. The COD removals of these four IESs were generally greater than 90%. The COD removal processes of the four systems could be better described by the improved pseudo-second-kinetic model, and the liquid film diffusion was the rate-controlling step. Moreover, the COD removal was a spontaneous and endothermic process. MB was degraded into inorganic substances in four steps. In addition, the FTIR characterization of the fillers before and after reaction suggests the four IESs have good stability.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Wei Shi,Xiaojing Liu,Yulei Liu,Dong Li,Xili Tong,Jun Ma,Lu Wang
Development of robust, reactive, and inexpensive catalyst for pollutants abatement with catalytic ozonation is of great significance. Herein, the effect of a robust and easy-recovery catalyst, Fe 2 O 3 /Al 2 O 3 -SiC, for the catalytic ozonation of hardly biodegradable COD (hard COD) in coking wastewater had been explored. Al-O-Si bond formed on modified SiC through the substitution of hydrogen in surficial Si-OH groups by Al 3+ . The Lewis acid sites improved the adsorption of ozone and facilitated the formation of ·OH and O 2 · − . For coking wastewater treatment , the removal ratio of hard COD and the generation speed of hydroxyl radical (R ct ) in the catalytic ozonation process were 71% and 253% higher than those in the ozonation group, respectively. Ozone utilization increased from 0.44 g COD removed/g O 3 in the ozonation group to 1.42 g COD removed/g O 3 in the Fe 2 O 3 /Al 2 O 3 -SiC catalytic ozonation group. In a full-scale application, Fe 2 O 3 /Al 2 O 3 -SiC catalytic ozonation decreased the consumption of O 3 to 60 mg L −1 and decreased the operation cost by 50%. These results provided an approachable way for sharing the extraordinary capacity of ozone for contaminants remediation in industrial applications.
研究领域:
环境科学
·
化学工程
·
工业废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2024
·Vol. 136
·期 1
·1-9
·
IF 1.7
Zhang Mingyu,Yan Dong,Xu Rui,Tang Yuqi,Xu Shuangping,Qu Yanqing,Xu Jingyu,Du Boyu,Jia Hongge
A new rhodium complex [Rh(cod)(TTT) 2 ] was synthesized by [Rh(cod)Cl] 2 as a precursor, and 4,4',4''-(1,3,5-triazine-2,4,6-triyl)trianiline (TTT) as a ligand. Its structure was verified by 1 H and 13 C NMR. The results indicate that the complex shows high activity in phenylacetylene polymerization. It was applied to the polymerization of phenylacetylene with a yield of 45.0% and Mw = 2.26×10 5 at ultra-low rhodium feed ratio ([Rh.]/[M.]=1/60000). Graphical abstract A new rhodium complex [Rh(cod)(TTT) 2 ] was synthesized by [Rh(cod)Cl] 2 as a precursor, and 4,4',4''-(1,3,5-triazine-2,4,6-triyl)trianiline (TTT) as a ligand. It was applied to the polymerization of phenylacetylene with a yield of 45.0% and Mw = 2.26×10 5 at ultra-low rhodium feed ratio ([Rh.]/[M.]=1/60000
研究领域:
无机化学
·
有机金属化学
·
高分子化学
·
催化
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Xiaoyan He,Shuo Ma,Zhilan Wang,Zheping Tan,Miaomiao Hou,Penggai Ma,Runze Cao,Xiaoquan Lu
Microbial fuel cell (MFC) can generate electrons through microbial metabolism of organic matter in sewage. In this paper, carbon felt as base material, the conductive polymers polyaniline and polypyrrole combined with silver nanowires were doped in hydrogel, a super hydrophilicity, low electron transfer resistance, good biocompatibility hydrogel MFC anode (PANI-PPy-Ag NWs/CF) were prepared. It showed a hand-torn bread structure, this three-dimensional (3D) porous structure increased microbial attachment amount. The anode could reach a maximum voltage output of 0.66 V in only 5.5 h, and produce a maximum power density of 2196.61 mW/m 3 . Due to the doping of silver nanowire, a new electronic mode was explored, coulomb efficiency of 31.01 % and an ultra-high COD removal rate (96.69 %) was obtained. This study introduces a conductive composite hydrogel MFC anode, which provides a new idea for the material diversity, electrical production and sewage removal performance of MFC anode.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Fang Zhang,Lei Wang,Lutao Yang,Yong Dai,Jun Zhang,Lei He,Juqing Cui,Jian Shen,Zhe Wang
Immobilized microbial technology is a simple, cost-effective, and efficient technique to minimize the difficulty and energy consumption of heavy oil extraction, as well as the COD of oilfield wastewater. In this work, PC- g -Mag(Fe-MOF) was prepared to immobilize microorganisms obtained by grafting lecithin after magnetization using Fe-MOF. The orthogonal tests showed that the optimum temperature for immobilized microorganisms was 38 °C, the optimum pH was 7, the optimum inoculum was 7 % and the desired mineralization level was <20,000 ppm. The viscosity of free and immobilized microorganisms decreased by 61.5 % and 76 %. The recovery efficiency of the carrier with two species of bacteria after 5 cycles of experiments was 87.5 % and 73.2 %, respectively. The removal rate of COD in the 5th time was 69.3 %, the viscosity reduction rate of heavy oil was 61.6 %. The recovery efficiency of heavy oil was increased by 25.09 %. Fe-MOF acts as a biocarrier to immobilize bacteria and enhance the metabolic activity of their microbial communities and improves COD removal from oilfield wastewater and viscosity reduction in heavy oil.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
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
·
水处理
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2019
·
IF 4.384
Amir Sheikhmohammadi,Ahmadreza Yazdanbakhsh,Gholamreza Moussavi,Akbar Eslami,Mohammad Rafiee,Mahdieh Sardar,Mohammad Almasian
This study proposes the combination of UV/sulfite with a biological reactor (USPB) for the degradation, dechlorination and mineralization of 2, 4, 6-trichlorophenol (TCP). The effects of pH, sulfite dosage, co-existing water anions and quenchers on the performance of the UV/sulfite process (USP) were investigated. The rate of degradation, dechlorination and mineralization of TCP under optimum experimental conditions of pH, 7.0; [sulfite]/[TCP] = 3.13; UV irradiation, 87 μW cm −2 ; dissolved oxygen (DO), 2 mg L -1 and an 80 min reaction time, were 100, 98 and 30.2%, respectively (initial TCP concentration was 250 mg L -1 and initial COD was 363 mg L -1 ). Investigation of the reaction mechanism revealed the superiority of sulfite radicals (SO 3 -) in the degradation and dechlorination of TCP. The co-existing water anions did not significantly affect the performance of TCP degradation. The intermediates derived from TCP degradation included: 1,3-cyclohexadiene, 2-chloro-1-benzoquinone, 2-chlorophenol, benzene, 2-hydroxy benzoquinone and cyclohexene . The (BOD 5 )/(COD) ratio (the solution biodegradability index) was obtained as 0.57 after 80 min of UV/sulfite reaction time. The effluent obtained from UV/sulfite after 80 min of reaction time (with COD of 253 mg L -1 ) was efficiently post-treated in a batch biological reactor (MLSS = 5000 mg L -1 ), and the COD reduced to 37 mg L -1 after 720 min (12 h) of aeration. Therefore, it was found that the combination of the UV/sulfite with a biological process might be an efficient method for the treatment of wastewater containing high concentrations of toxic compounds.
研究领域:
环境科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Yan Feng,Zhijie Zhang,Youheng Zhao,Liang Song,Xinwei Wang,Shumin Yang,Yingying Long,Chunhui Zhao,Liping Qiu
Electro-biological particle electrode (EPE) made from steel converter slag (SCS) was used as a particle electrode in an enlarged anode electric biological (EAEB) reactor for Rhodamine B (RhB) wastewater treatment, and its purification performance and microbial community were examined. The results revealed that (1) the EAEB reactor showed much higher average removal rates of RhB, COD and NH 4 + -N, i.e. 91.68%, 87.63%, and 90.54%, which meant an increase by 59.86%, 20.48%, and 14.22%, respectively, compared with BAF; (2) The optimum current intensity (CI) for simultaneously removing RhB, COD and NH 4 + -N in the EAEB reactor was at 1.00 A; and (3) Methylophilus, Aeromonas, Pseudomonas, Pelomonas and Zoogloea accounted for the main bacterial community in EAEB. Therefore, the EAEB reactor with EPE produced from steel converter slag (SCS) was suitable to simultaneously remove RhB, COD and NH 4 + -N.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Guihong Han,Yifan Du,Yanfang Huang,Shuzhen Yang,Wenjuan Wang,Shengpeng Su,Bingbing Liu
Benzohydroxamic acid (BHA) is intensively used as collector in the mineral processing industry, and thus tremendous hazardous beneficiation wastewater containing BHA organic contaminant needs urgent treatment. In this work, an efficient removal of BHA organic contaminants from various industrial beneficiation wastewaters via the chelation, flocculation, and precipitation flotation process was studied. The removal efficiency of BHA, COD and turbidity of the purified water, and the chelation mechanism were investigated by optical microscope, SEM, FTIR, XPS, Zeta potential, and thermodynamic analyses. The results showed that organic BHA contaminant can be chelated firstly by Cu(II) to form hydrophobic BHA-Cu precipitate effectively via the “O-O” chelation and a five-membered chelation ring was formed under weak alkaline conditions. The generated precipitate was then successfully removed using CTAB as surfactant and NP-40 as frother in a microbubble flotation column. Over 94% BHA was removed under the optimal chelation, flocculation and flotation conditions: chelation with Cu(II) concentration of 30 mg/L and pH of 8 for 30 min; flocculation with CTAB concentration of 0.2 mg/L for 20 min; followed by flotation with NP-40 frother of 0.6 mg /L and air flow rate of 100 mL/min for over 40 min. Under this condition, 83.91% COD was removed, and the residuel COD and turbidity of the purified water were lower than 25 mg/L and 0.1 NTU, respectively, which met the wastewater discharge requirement. It’s demonstrated that the precipitate flotation can be employed as an effective method to purify industrial wastewater containing BHA. In addition, the interaction mechanism of Cu(II) and BHA under different pH values was also discussed in this work.
研究领域:
环境科学
·
化学工程
·
矿物加工工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）