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Treatment of tannery wastewater by electrocoagulation

Journal of Environmental Sciences 2007年第12期19卷 1409-1415页

作者： FENG Jing-wei SUN Ya-bing ZHENG Zheng ZHANG Ji-biao LI Shu TIAN Yuan-chun State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

Treatment of tannery wastewater by electrocoagulation with low cell current （≤ 1A） and soluble electrodes （mild steel electrodes and aluminum electrodes） was studied. Compared with aluminum electrodes, mild steel electrodes were more effective for the removal of sulfide, with a removal efficiency of over 90%. But during the treatment process, black color precipitate typical to iron（Ⅱ） sulfides was produced. While aluminum electrodes were effective to eliminate the colority of the effluent, the removal efficiency of sulfide was lower than 12%. The mechanisms of the removal of chemical oxygen demand, ammonia, total organic carbon, sulfide and colority with the two soluble electrodes （mild steel and aluminum electrodes） were discussed in detail. In order to exert the predominance of diffenent types of electrodes, the tannery wastewater was treated using mild steel electrodes first followed by the filter and finally by the aluminum electrodes, the elimination rates of chemical oxygen demand, ammonia, total organic carbon, sulfide and colority were 68.0%, 43.1%, 55.1%, 96.7% and 84.3%, respectively, with the initial concentrations 2413.1 mg/L, 223.4 mg/L, 1000.4 mg/L, 112.3 mg/L and 256 dilution times, respectively. The absorbance spectra and energy consumption during electrocoagulation process were also discussed.

关键词： tannery wastewater electrocoagulation mild steel electrodes aluminum electrodes

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Removing contaminants from tannery wastewater by chemical precipitation using CaO and Ca(OH)2

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1107-1111页

作者： Adriana Reyes-Serrano Joel ELópez-Alejo Manuel AHernández-Cortázar Ignacio Elizalde Instituto Politécnico Nacional Centro Mexicano para la Producción más LimpiaCiudad de México 07340Mexico

The removal of Cr,sulfates and Chemical Oxygen Demand(COD)from industrial tannery wastewater by chemical precipitation was carried out using Calcium oxide(CaO)and Calcium hydroxide(Ca(OH)2).Different doses of alkalis,ranging from deficiency to excess hydroxyl species over the stoichiometric necessary,were used to remove theoretically the 100%of Cr[0.3-3.2 g alkali·(g Cr^3+)^-1].The precipitation was carried out at room temperature,10 min of vigorous stirring,200 r·min^-1 and a settling time of 24 h,followed by separation and characterization of liquid *** result of addition of alkalis,pH underwent increase as did the alkali *** removal of Cr,and sulfates also increased as alkali concentration did,although for first species the changes at higher alkali contents were less *** removal on the other hand,did not follow a unique trend,instead exhibited a *** on our results,selection of a specific dose of alkali was carried out taking as reference the efficiency on total chromium removal,keeping the pH in the range 7 to 9 to ensure Cr precipitation as chromium *** those conditions,jar test was used to produce enough liquid product in order to determine the removal percent of several other *** removal percent of the species was as follows:Cr,SO4^2-,ZnSO4,FeSO4,CN^-1,NiSO4,Fe2[Fe(CN)6]at 99.8%,66.9%,99.6%,21.4%,70.9%,52.8%and 76.4%with CaO,and 99.8%,61.6%,99.9%,7.1%,84.0%,54.4%and 90.5%with Ca(OH)2,respectively.

关键词： tannery wastewater Alkali Removal Chromium Sulfates Synergistic effect

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tannery wastewater treatment:conventional and promising processes,an updated 20-year review

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Journal of Leather Science and Engineering 2022年第3期4卷 130-151页

作者： Jun Zhao Qinglian Wu Yuling Tang Jianfei Zhou Hongguang Guo MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065People’s Republic of China National Engineering Research Center of Clean Technology in Leather Industry Sichuan UniversityChengdu 610065People’s Republic of China

Mismanagement of various wastes especially waste water produced by tanning processes has caused serious environmental problems and ultimately impaired human *** efforts have been making to alleviate the pollution of tannery wastewater(TWW),yet terminal treatment still takes *** this review,research on TWW treatment from 2000 to 2021 was summarized,and main methods such as coagulation and flocculation,adsorption,biological treatment,membrane filtration,advanced oxidation process were briefly *** detailed introduc-tion was given to the method of electrochemical treatment since it has excellent performance such as environmental friendliness and high efficiency,hence attracting more and more research attention in recent *** view of the harsh physi-chemical conditions of TWW,integrated or combined treatment methods are accordingly recommended with better performance and multi-function,however comprehensive studies on optimization of methods combina-tion and cost-effectiveness are *** certain issues that the residue Cr in treatment sludge and high salinity in effluent still remain were put forward in this work and potential solutions were ***,this review pro-posed the perspective that realizing multi-function,recycling,and intensification should be the developing direction for future TWW *** review is expected to provide a general guide for researchers who aspire to ameliorate TWW pollution problems and understand various methods utilized in this field.

关键词： tannery wastewater Decontamination Treatment Electrochemical Integrated methods Recycling

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Facile fabrication of functional cellulose paper with high-capacity immobilization of Ag nanoparticles for catalytic applications for tannery wastewater

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Journal of Leather Science and Engineering 2020年第1期2卷 55-65页

作者： Ruiquan Yu Tianxiang Lan Jing Jiang Hao Peng Ruifeng Liang Gongyan Liu National Engineering Laboratory for Clean Technology of Leather Manufacture College of Biomass Science and EngineeringSichuan UniversityChengdu 610065China The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education College of Biomass Science and EngineeringSichuan UniversityChengdu 610065China The State Key Laboratory of Hydraulic and Mountain River Engineering Sichuan UniversityChengdu 610065China

It has been a research goal to develop macroscopic materials with an optimized surface structure to affix silver nanoparticles which could contaminate water and maximize their practical *** paper is a versatile biomass material valued for its abundance,low cost,biocompatibility,and natural *** now,its potential application in water purification has not been adequately *** this study,gallic acid-modified silver nanoparticles(GA@AgNPs)were loaded onto commercial cellulose filter paper using a simple lipoic acid modification process(GA@AgNPs-LA-CP).Scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),and X-ray diffraction(XRD)were used to characterize the GA@*** catalytic activity of the GA@AgNPs-LA-CP was evaluated by the reduction reaction of methylene blue(MB),Rhodamine B(RhB),and 4-nitrophenol(4-NP)with sodium borohydride(NaBH4).The GA@AgNPs-LA-CP exhibited excellent catalytic activity toward MB,RhB,and 4-NP,taking advantage of its high specific surface area generated by the cellulose fiber network ***,due to the electrostatic interactions between the cationic dyes and the GA@AgNPs,the as-prepared catalytic composite material serves as a better catalyst for MB and RhB,suggesting dual applications of the composite materials for organic wastewater treatment and the removal of harmful *** implies that the immobilization of AgNPs on cellulose papers is an effective method and can be applied to efficient wastewater treatment applications.

关键词： Ag nanoparticles Catalyst tannery wastewater Cellulose paper

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The Mechanism of the Treatment of tannery wastewater by Micro-electrolysis

The Mechanism of the Treatment of Tannery Wastewater by Micr...

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The 12th Asian Pacific Confederation of Chemical Engineering Congress

作者： Li Yan Jing Guo-Hua Li Tian-Peng Zhou Zuo-Ming College of Material Science and Engineering,University of HuaQiao,362021,Quanzhou,China

In this paper changes of pH value and Feconcentration were determined during the micro- electrolysis *** the removal of CODby micro- electrolysis method was compared to that by direct flocculation process with *** rem... 详细信息

关键词： micro-electrolysis tannery wastewater mechanism analysis

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