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coking wastewater treatment for industrial reuse purpose: Combining biological processes with ultrafiltration, nanofiltration and reverse osmosis

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Journal of Environmental Sciences 2013年第8期25卷 1565-1574页

作者： Xuewen Jin Enchao Li Shuguang Lu Zhaofu Qiu Qian Sui State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology Shanghai Baosteel Chemical Co. Ltd.

A full-scale plant using anaerobic, anoxic and oxic processes （A1/A2/O）, along with a pilot-scale membrane bioreactor （MBR）, nanofiltration （NF） and reverse osmosis （RO） integrated system developed by Shanghai Baosteel Chemical Co. Ltd., was investigated to treat coking wastewater for industrial reuse over a period of one year. The removals reached 82.5% （COD）, 89.6% （BOD）, 99.8% （ammonium nitrogen）, 99.9% （phenol）, 44.6% （total cyanide （T-CN））, 99.7% （thiocyanide （SCN-）） and 8.9% （fluoride）, during the A1/A2/O biological treatment stage, and all parameters were further reduced by over 96.0%, except for fluoride （86.4%）, in the final discharge effluent from the currently operating plant. The pilot-scale MBR process reduced the turbidity to less than 0.65 NTU, and most of the toxic organic compounds were degraded or intercepted by the A1/A2/O followed MBR processes. In addition, parameters including COD, T-CN, total nitrogen, fluoride, chloride ion, hardness and conductivity were significantly reduced by the NF-RO system to a level suitable for industrial reuse, with a total water production ratio of 70.7%. However, the concentrates from the NF and RO units were highly polluted and should be disposed of properly or further treated before being discharged.

关键词： coking wastewater industrial water reuse biological treatment MBR NF-RO

Removal of polycyclic aromatic hydrocarbons and phenols from coking wastewater by simultaneously synthesized organobentonite in a one-step process

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Journal of Environmental Sciences 2012年第2期24卷 248-253页

作者： Zhenhua Wu Lizhong Zhu Department of Environmental Science Zhejiang University Hangzhou 310028 China Zhejiang Provincial Key Laboratory of Organic Pollution Process Control Hangzhou 310028 China

The optimal condition for a one-step process removing organic compounds from coking wastewater by simultaneously synthesized organobentonite as a pretreatment was *** showed that sorption of organic compounds by organobentonite was positively correlated to the cation surfactant exchange on the bentonite and the octanol-water partition coefficient（Kow） of the *** 0.75 g/L bentonite and 180 mg/L（60% of bentonite cation exchange capacity） cetyltrimethylammonium bromide,the removal efficiencies of the 16 polycyclic aromatic hydrocarbon（PAHs） specified by the US Environmental Protection Agency in coking wastewater except naphthalene were more than 90%,and that of benzo（a）pyrene was 99.5%.At the same time,the removal efficiencies of CODCr,NH3-N,volatile phenols,colour and turbidity were 28.6%,13.2%,8.9%,55% and 84.3%,respectively,and the ratio of BOD5/CODCr increased from 0.31 to *** results indicated that the one-step process had high removal efficiency for toxic and refractory hydrophobic organic compounds,and could improve the biodegradability of the coking *** it could be a promising technology for the pretreatment of toxic and refractory organic wastewater.

关键词： one-step process coking wastewater bentonite surfactant sorption

Performance of a polymerization-based electrochemically assisted persulfate process on a real coking wastewater treatment

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Journal of Environmental Sciences 2024年第12期146卷 149-162页

作者： Suiqin Yang Yuhong Cui Zhengqian Liu Chao Peng Shiquan Sun Jingjing Yang Mingkui Wang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Eawag Swiss Federal Institute of Aquatic Science and TechnologyÜberlandstrasse 133Dübendorf CH-8600Switzerland School of Hydraulic Engineering Changsha University of Science&TechnologyChangsha 410114China Center for Separation and Purification Materials&Technologies Suzhou University of Science and TechnologySuzhou 215009China

Industrial wastewater should be treated with caution due to its potential environmental *** this study,a polymerization-based cathode/Fe^(3+)/peroxydisulfate(PDS)process was employed for the first time to treat a raw coking wastewater,which can achieve simulta-neous organics abatement and recovery by converting organic contaminants into separable solid *** results confirm that several dominant organic contaminants in coking wastewater such as phenol,cresols,quinoline and indole can be induced to poly-merize by self-coupling or *** total chemical oxygen demand(COD)abate-ment from coking wastewater is 46.8%and the separable organic-polymer formed from or-ganic contaminants accounts for 62.8%of the abated *** organic carbon(DOC)abatement of 41.9%is achieved with about 89%less PDS consumption than conventional degradation-based *** conditions such as PDS concentration,Fe3+concen-tration and current density can affect the COD/DOC abatement and organic-polymer yield by regulating the generation of reactive ***-MS result shows that some organic-polymers are substituted by inorganic ions such as Cl^(-),Br^(-),I^(-),NH_(4)^(+),SCN^(-)and CN^(-),suggest-ing that these inorganic ionsmay be involved in the *** specific consump-tion of this coking wastewater treatment is 27 kWh/kg COD and 95 kWh/kg *** values are much lower than those of the degradation-based processes in treating the same coking wastewater,and also are lower than those of most processes previously reported for coking wastewater treatment.

关键词： Polymerization coking wastewater Organics recovery Advanced oxidation process Water treatment

Preparation of Ti-based Yb-doped SnO_(2)-RuO_(2) electrode and electrochemical oxidation treatment of coking wastewater

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Journal of Rare Earths 2022年第5期40卷 763-771,I0003页

作者： Weida Wang Ke Wang Wenting Hao Tingting Zhang Yijie Liu Linghong Yu Weiping Li School of Energy and Environment Inner Mongolia University of Science and TechnologyBaotou 014010China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi'an 710055China MCC Northwest Engineering Technology Co. Ltd.Baotou 014010China

In this study,the Ti/SnO_(2)-RuO_(2) electrodes with different Yb contents were prepared by sol-gel method and thermal decomposition method,and the surface morphology and crystal structure of the electrodes were characterized by scanning electron microscopy(SEM),atomic force microscopy(AFM) and X-ray diffraction(XRD),the electrochemical properties of the electrodes were tested by linear sweep voltammetry(LSV) and cyclic voltammetry(CV).The electrochemical oxidation device was constructed with Yb-doped Ti/SnO_(2)-RuO_(2) electrode as the anode and titanium plate as the cathode,and the electrochemical oxidation effect and product changes of the anode on co king wastewater were *** results show that the surface of the electrode is flat with high crystallinity of SnO_(2) and RuO_(2) crystals at1.5% Yb doping,and the LSV and CV curves indicate that the Yb doping of 1.5% increases the oxygen precipitation potential and electrocatalytic oxidation activity of the *** the electrode with Yb doping of 1.5% is the anode with current density of 10 mA/cm^(2) electrochemical oxidation time of 30 min,the electrode can remove chemical oxygen demand(COD) up to 85.06%,total organic carbon(TOC) up to 60.59% and UV_(254) from 1.594 to 0.507 for coking *** chromatography(GC-MS),UV-vis and three-dimensional fluorescence results of coking wastewater before and after treatment show that large toxic substances in coking wastewater are degraded to low toxic organic substances,and most soluble organic substances are degraded and *** study provides the possibility of basic research for the engineering practice of electrochemical oxidation for the treatment of coking wastewater.

关键词： Yb Ti/SnO_(2)-RuO_(2) Electrochemical oxidation coking wastewater

Pulsed corona discharge for improving treatability of coking wastewater

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Journal of Environmental Sciences 2018年第2期30卷 306-316页

作者： Ming Liu Sergei Preis Iakov Kornev Yun Hu Chao-Hai Wei School of Environment and Energy South China University of Technology Guangzhou 510006 China Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal Guangzhou 510006 China Institute of High Technology Physics National Research Tomsk Polytechnic University 30 Lenin Ave. Tomsk 634050 Russian Federation

coking wastewater（CW） contains toxic and macromolecular substances that inhibit biological treatment. The refractory compounds remaining in biologically treated coking wastewater（BTCW） provide chemical oxygen demand（COD） and color levels that make it unacceptable for reuse or disposal. Gas-phase pulsed corona discharge（PCD） utilizing mostly hydroxyl radicals and ozone as oxidants was applied to both raw coking wastewater（RCW） and BTCW wastewater as a supplemental treatment. The energy efficiency of COD,phenol, thiocyanate and cyanide degradation by PCD was the subject of the research. The cost-effective removal of intermediate oxidation products with addition of lime was also studied. The energy efficiency of oxidation was inversely proportional to the pulse repetition frequency： lower frequency allows more effective utilization of ozone at longer treatment times. Oxidative treatment of RCW showed the removal of phenol and thiocyanate at 800 pulses per second from 611 to 227 mg/L and from 348 to 86 mg/L, respectively, at 42 k Wh/m^3 delivered energy, with substantial improvement in the BOD5/COD ratio（from 0.14 to 0.43）.The COD and color of BTCW were removed by 30% and 93%, respectively, at 20 k Wh/m^3,showing energy efficiency for the PCD treatment exceeding that of conventional ozonation by a factor of 3–4. Application of lime appeared to be an effective supplement to the PCD treatment of RCW, degrading COD by about 28% at an energy input of 28 k Wh/m3 and the lime dose of 3.0 kg/m^3. The improvement of RCW treatability is attributed to the degradation of toxic substances and fragmentation of macromolecular compounds.

关键词： coking wastewater Liming Low-temperature plasma Oxidation Ozone

Advanced treatment of biologically pretreated coking wastewater by intensified zero-valent iron process(IZVI) combined with anaerobic filter and biological aerated filter(AF/BAF)

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Journal of Central South University 2015年第10期22卷 3781-3787页

作者：潘碌亭韩悦吴锦峰 Modern Agricultural Science and Engineering Institute Tongji University Transmission and Transformer Engineering Company of Guangdong Province

Experiments were conducted to investigate the behavior of the sequential system of intensified zero-valent iron process(IZVI) and anaerobic filter and biological aerated filter(AF/BAF) reactors for advanced treatment of biologically pretreated coking wastewater. Particular attention was paid to the performance of the integrated system for the removal of chemical oxygen demand(COD), ammonia nitrogen(NH3-N) and total nitrogen(TN). The average removal efficiencies of COD, NH3-N and TN were 76.28%, 96.76% and 59.97%, with the average effluent mass concentrations of 56, 0.53 and 18.83 mg/L, respectively, reaching the first grade of the national discharge standard. Moreover, the results of gas chromatography/mass spectrum(GC/MS) and gel permeation chromatography(GPC) analysis demonstrated that the refractory organic compounds with high relative molecular mass were partly removed in IZVI process by the function of oxidation-reduction, flocculation and adsorption which could also enhance the biodegradability of the system effluent. The removal efficiencies of NH3-N and TN were achieved mainly in the subsequent AF/BAF reactors by nitrification and denitrification. Overall, the results obtained show that the application of IZVI in combination with AF/BAF is a promising technology for advanced treatment of biologically pretreated coking wastewater.

关键词： advanced treatment coking wastewater intensified zero valent iron biofilter

Revealing the anaerobic acclimation of microbial community in a membrane bioreactor for coking wastewater treatment by Illumina Miseq sequencing

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Journal of Environmental Sciences 2018年第2期30卷 139-148页

作者： Jiadi Zhu Lujun Chen Yan Zhang Xiaobiao Zhu School of environment Tsinghua Uniuersity Beijing 100084 China Zhejiang Provincial Key Laboratory of Water Science and Technology Department of Environmental Technology and Ecology Yangtze Delta Region Institute of Tsinghua University Zhejiang Jiaxing 314050 China School of Environmental and Civil Engineering Jiangnan University Wuxi 214222 China College of Chemical Engineering Beijing University of Chemical Technology Beijing 200029 China

The dynamic change of microbial community during sludge acclimation from aerobic to anaerobic in a MBR for coking wastewater treatment was revealed by Illumina Miseq sequencing in this study. The diversity of both Bacteria and Archaea showed an increase–decrease trajectory during acclimation, and exhibited the highest at the domestication interim. Ignavibacteria changed from a tiny minority（less than 1%） to the dominant bacterial group（54.0%） along with acclimation. The relative abundance of Betaproteobacteria kept relatively steady, as in this class some species increased coupled with some other species decreased during acclimation. The dominant Archaea shifted from Halobacteria in initial aerobic sludge to Methanobacteria in the acclimated anaerobic sludge. The dominant bacterial and archaeal groups in different acclimation stages were indigenous microorganisms in the initial sludge, though some of them were very rare. This study supported that the species in＂rare biosphere＂ might eventually become dominant in response to environmental change.

关键词： Microbial community Acclimation coking wastewater Anaerobic MBR Miseq sequencing

Biological removal of antiandrogenic activity in gray wastewater and coking wastewater by membrane reactor process

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Journal of Environmental Sciences 2015年第7期27卷 195-202页

作者： Dehua Ma Lujun Chen Cong Liu Chenjun Bao Rui Liu School of Environment Tsinghua University Zhejiang Provincial Key Laboratory of Water Science and Technology

A recombinant human androgen receptor yeast assay was applied to investigate the occurrence of antiandrogens as well as the mechanism for their removal during gray wastewater and coking wastewater treatment. The membrane reactor（MBR） system for gray wastewater treatment could remove 88.0% of antiandrogenic activity exerted by weakly polar extracts and 97.3% of that by moderately strong polar extracts, but only 32.5%of that contributed by strong polar extracts. Biodegradation by microorganisms in the MBR contributed to 95.9% of the total removal. After the treatment, the concentration of antiandrogenic activity in the effluent was still 1.05 μg flutamide equivalence（FEQ）/L, 36.2%of which was due to strong polar extracts. In the anaerobic reactor, anoxic reactor, and membrane reactor system for coking wastewater treatment, the antiandrogenic activity of raw coking wastewater was 78.6 mg FEQ/L, and the effluent of the treatment system had only 0.34 mg FEQ/L. The antiandrogenic activity mainly existed in the medium strong polar and strong polar extracts. Biodegradation by microorganisms contributed to at least 89.2%of the total antiandrogenic activity removal in the system. Biodegradation was the main removal mechanism of antiandrogenic activity in both the wastewater treatment systems.

关键词： Biological removal Antiandrogenic activity Gray wastewater coking wastewater Membrane reactor

Degradation analysis of A^2/O combined with AgNO3 + K2FeO4 on coking wastewater

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Chinese Journal of Chemical Engineering 2018年第7期26卷 1555-1560页

作者： Pengyu Zhu Kaijin Zhu Rob Puzey Xiaoli Ren School of Engineering University of HullCottingham RoadHullthe United Kingdom Department of Environmental Engineering Taiyuan Institute of TechnologyTaiyuan 030008China

In this work, a coking wastewater was selected and a biochemical Az/O treatment device for fractional degradation was designed and employed. After each stage of the treatment, the products were analyzed through gas chromatography-mass spectroscopy （GC-MS） to determine their composition. Finally, AgNO3 ＋ K2FeO4 was used as an advanced deep catalytic oxidation treatment. It was concluded from the analysis that cyclic organics could be degraded and the chemical oxygen demand （COD） was controlled within 50 mg. L-1, in line with the target value, Meanwhile, the spectra obtained from the GC-MS were in accordance with the conclusions reached based on the COD. The research results showed that all hard-degradable organics in coking wastewater could be eliminated through the A2/O bio-membrane treatment and the advanced treatment of making use of K2FeO4 as an oxidant and Ag＋ as a catalyst, the catalytic efficiency with Ag＋ as a catalyst of K2FeO4 was very high. Ag＋ could evidently improve the oxidation capacity of K2FeO4 to wastewater in its short stability time, and this is an important innovation.

关键词： coking wastewater Biochemical treatment AgNO3 + K2FeO4 catalytic oxidation Cyclic organics Degradation characteristics