The characteristics and harm of high concentrations of organic wastewater were introducecl firstly, and then several treatment processes and effects of high concentrations of organic wastewater were summarized, which ...The characteristics and harm of high concentrations of organic wastewater were introducecl firstly, and then several treatment processes and effects of high concentrations of organic wastewater were summarized, which can provide theoretical references for the choice of wastewater treatment process.展开更多
By using the introduced CWO technology and its 200 L/d plant, more than 10 kinds of industrial wastewaters with high concentration in China, such as the waste liquor of coking, the black liquor of paper making, the wa...By using the introduced CWO technology and its 200 L/d plant, more than 10 kinds of industrial wastewaters with high concentration in China, such as the waste liquor of coking, the black liquor of paper making, the waste mother liquor of bio-pharmacy and so on, were treated in this test research. The results showed that the CWO technology and its equipment had a good applicability for treating the industrial wastewaters with high concentration in China. One set of CWO-20 m^3/d industrial plant, as a demonstration engineering installation of CWO technology, was independently designed, made and operated in Kunming city. During the running test, the CWO-20 m^3/d plant displayed a favorable treatment capability for the bio-degradedly difficult industrial wastewaters with high concentration. For the treatment of the waste liquor from coking and the black liquor of paper making, more than 99% of CODcr and NH3-N in the wastewater could be removed. The CWO-20 m^3/d plant could be run continuously and stably. The treated wastewater could meet the discharge standard and the treatment process with CWO technology shown up a good economic advantage.展开更多
High-concentrated sulfur wastewater with sodium and COD （chemical oxygen demand） up to 26000 mg/L from a chemical plant, Jiangsu Province of China has been treated by deposition of natrojarosite in lab. The results ...High-concentrated sulfur wastewater with sodium and COD （chemical oxygen demand） up to 26000 mg/L from a chemical plant, Jiangsu Province of China has been treated by deposition of natrojarosite in lab. The results indicated that the COD of the wastewater was decreased sharply from 26000 mg/L to 1001 mg/L, with removal rate of COD up to 96% by twice precipitations of natrojarosite and twice oxidation of H202. The treated sulfur wastewater reached the requirement of subsequent biochemical treatment to water quality. The optimal operational parameters should be controlled on pH value between 2.50 and 3.20 and 50 g FeCly6H2O solid added in per liter wastewater. The study provided an experimental basis for pretreatment of high-concentrated sulfur wastewater and proposed a new mineralogical method on treatment of other wastewaters. Depositing process of jarosite and its analogs should be able to be used to treat wastewater from mine and other industries to remove S, Fe and other toxic and harmful elements, such as As, Cr, Hg, Pb, etc. in the water.展开更多
Traditional Fenton oxidation is an effective method for reducing pollutants that are difficult to degrade.Owing to the large amounts of Fe(II),acids,and alkalis added in the reaction,large amounts of Fenton sludge are...Traditional Fenton oxidation is an effective method for reducing pollutants that are difficult to degrade.Owing to the large amounts of Fe(II),acids,and alkalis added in the reaction,large amounts of Fenton sludge are produced,increasing treatment costs and restricting the method’s application.In this study,we developed a three-dimensional electro-Fenton system by adding iron-carbon filler and investigated the effects of different electrolytic cell structure arrangements,particle electrode dosages,sponge iron(SI)to granular activated carbon(GAC)dosage ratios,current densities,H_(2)O_(2)dosages,and cathodic aeration on nitrobenzene(NB)wastewater treatment.The optimal system conditions were a particle electrode dosage of 100 g/L,SI:GAC mass ratio of 3:1,current density of 30 mA/cm^(2),H_(2)O_(2)dosage of 50 mmol/L,cathodic aeration of 0.8 L/min,and hydraulic retention time of 120 min.The average NB removal rate and chemical oxygen demand reached 67.38%±1.05%and 70.60%±1.15%,respectively,for which the increase in Fenton sludge was 891.8 mg/L.Different from the traditional Fenton process,additional Fe(II)was not required in the process used herein,reducing iron sludge accumulation and lowering the operating costs of using Fenton sludge as a hazardous waste treatment.In addition,the process applied in this study was able to reduce the chemical amounts used and increase the treatment efficiency.The reductions in sludge treatment costs and secondary pollutants make the proposed process an efficient and sustainable alternative for treating NB wastewater.展开更多
Rich oxygen-biological activated carbon(RO-BAC)method developed from traditional BAC method is a sys-tem in which high pressure is applied to improve the oxy-gen concentration of the influent.Experiment withwastewater...Rich oxygen-biological activated carbon(RO-BAC)method developed from traditional BAC method is a sys-tem in which high pressure is applied to improve the oxy-gen concentration of the influent.Experiment withwastewater and the slightly deteriorated raw water showsthe system is an effective option for advanced treatmentof industry wastewater and pretreatment of slightly dete-riorated raw water.The experiment results and the in-fluential factors are discussed in this paper.展开更多
[Objective] This paper aimed to study the treatment process of high con- centration wastewater from organic fungicide production by using Fenton oxidation. [Method] The alkali out pretreatment was used to investigate ...[Objective] This paper aimed to study the treatment process of high con- centration wastewater from organic fungicide production by using Fenton oxidation. [Method] The alkali out pretreatment was used to investigate the effects of NaOH concentration, molar ratio of H2O2 to Fe2＋ and H202 dosage on COD removal rate and decolourization ratio. [Result] The optimal operating conditions were determined as follows： pH=3.0, NaOH concentration of 15 g/L, n [H2O2]：n [Fe2＋] =4.20, reaction time of 30 min. [Conclmio.] The research provided scientific references for the treatment of high concentration wastewater from fungicide production.展开更多
近年来随着经济快速发展,化工行业产生大量高浓度有机废水,此类废水中有机污染物浓度高、污染物种类多、性质差异大、毒性大,存在巨大的环境风险。本文对Web of Science(WOS)核心合集数据库和中国知网(CNKI)核心论文数据库中的相关文献...近年来随着经济快速发展,化工行业产生大量高浓度有机废水,此类废水中有机污染物浓度高、污染物种类多、性质差异大、毒性大,存在巨大的环境风险。本文对Web of Science(WOS)核心合集数据库和中国知网(CNKI)核心论文数据库中的相关文献进行可视化处理,综述了国内外高浓度有机废水研究现状。该领域近十年来我国研究热点集中于高浓度有机废水的“零排放”、资源化利用、膜处理、生化-物化技术方面的研究。并结合现有问题从组合工艺高效处理废水与低成本资源化方向提出可行性建议,包括:1)针对性组合工艺发展,因地制宜实现高浓度有机废水高效、绿色、低价处理;2)开发新型水处理技术,实现低成本、低碳化、高效率工艺升级;3)提升资源化效率,实现水、盐、贵金属和高值有机物甚至是过程中产生热能的回收利用,提升低值废盐等的高值利用;4)模块化和智能化,结合人工智能等实现处理单元模块化、智能化等,升级环保产业新质生产力。展开更多
文摘The characteristics and harm of high concentrations of organic wastewater were introducecl firstly, and then several treatment processes and effects of high concentrations of organic wastewater were summarized, which can provide theoretical references for the choice of wastewater treatment process.
文摘By using the introduced CWO technology and its 200 L/d plant, more than 10 kinds of industrial wastewaters with high concentration in China, such as the waste liquor of coking, the black liquor of paper making, the waste mother liquor of bio-pharmacy and so on, were treated in this test research. The results showed that the CWO technology and its equipment had a good applicability for treating the industrial wastewaters with high concentration in China. One set of CWO-20 m^3/d industrial plant, as a demonstration engineering installation of CWO technology, was independently designed, made and operated in Kunming city. During the running test, the CWO-20 m^3/d plant displayed a favorable treatment capability for the bio-degradedly difficult industrial wastewaters with high concentration. For the treatment of the waste liquor from coking and the black liquor of paper making, more than 99% of CODcr and NH3-N in the wastewater could be removed. The CWO-20 m^3/d plant could be run continuously and stably. The treated wastewater could meet the discharge standard and the treatment process with CWO technology shown up a good economic advantage.
文摘High-concentrated sulfur wastewater with sodium and COD （chemical oxygen demand） up to 26000 mg/L from a chemical plant, Jiangsu Province of China has been treated by deposition of natrojarosite in lab. The results indicated that the COD of the wastewater was decreased sharply from 26000 mg/L to 1001 mg/L, with removal rate of COD up to 96% by twice precipitations of natrojarosite and twice oxidation of H202. The treated sulfur wastewater reached the requirement of subsequent biochemical treatment to water quality. The optimal operational parameters should be controlled on pH value between 2.50 and 3.20 and 50 g FeCly6H2O solid added in per liter wastewater. The study provided an experimental basis for pretreatment of high-concentrated sulfur wastewater and proposed a new mineralogical method on treatment of other wastewaters. Depositing process of jarosite and its analogs should be able to be used to treat wastewater from mine and other industries to remove S, Fe and other toxic and harmful elements, such as As, Cr, Hg, Pb, etc. in the water.
基金supported by the National Natural Science Foundation of China(Grant No.52360009)the Lanzhou Science and Technology Plan(China)(2023-3-86).
文摘Traditional Fenton oxidation is an effective method for reducing pollutants that are difficult to degrade.Owing to the large amounts of Fe(II),acids,and alkalis added in the reaction,large amounts of Fenton sludge are produced,increasing treatment costs and restricting the method’s application.In this study,we developed a three-dimensional electro-Fenton system by adding iron-carbon filler and investigated the effects of different electrolytic cell structure arrangements,particle electrode dosages,sponge iron(SI)to granular activated carbon(GAC)dosage ratios,current densities,H_(2)O_(2)dosages,and cathodic aeration on nitrobenzene(NB)wastewater treatment.The optimal system conditions were a particle electrode dosage of 100 g/L,SI:GAC mass ratio of 3:1,current density of 30 mA/cm^(2),H_(2)O_(2)dosage of 50 mmol/L,cathodic aeration of 0.8 L/min,and hydraulic retention time of 120 min.The average NB removal rate and chemical oxygen demand reached 67.38%±1.05%and 70.60%±1.15%,respectively,for which the increase in Fenton sludge was 891.8 mg/L.Different from the traditional Fenton process,additional Fe(II)was not required in the process used herein,reducing iron sludge accumulation and lowering the operating costs of using Fenton sludge as a hazardous waste treatment.In addition,the process applied in this study was able to reduce the chemical amounts used and increase the treatment efficiency.The reductions in sludge treatment costs and secondary pollutants make the proposed process an efficient and sustainable alternative for treating NB wastewater.
文摘Rich oxygen-biological activated carbon(RO-BAC)method developed from traditional BAC method is a sys-tem in which high pressure is applied to improve the oxy-gen concentration of the influent.Experiment withwastewater and the slightly deteriorated raw water showsthe system is an effective option for advanced treatmentof industry wastewater and pretreatment of slightly dete-riorated raw water.The experiment results and the in-fluential factors are discussed in this paper.
基金Supported by the Overall Strategic Cooperation Program of Chinese Academy of Sciences in Guangdong Province(2012B09040046)~~
文摘[Objective] This paper aimed to study the treatment process of high con- centration wastewater from organic fungicide production by using Fenton oxidation. [Method] The alkali out pretreatment was used to investigate the effects of NaOH concentration, molar ratio of H2O2 to Fe2＋ and H202 dosage on COD removal rate and decolourization ratio. [Result] The optimal operating conditions were determined as follows： pH=3.0, NaOH concentration of 15 g/L, n [H2O2]：n [Fe2＋] =4.20, reaction time of 30 min. [Conclmio.] The research provided scientific references for the treatment of high concentration wastewater from fungicide production.
文摘近年来随着经济快速发展,化工行业产生大量高浓度有机废水,此类废水中有机污染物浓度高、污染物种类多、性质差异大、毒性大,存在巨大的环境风险。本文对Web of Science(WOS)核心合集数据库和中国知网(CNKI)核心论文数据库中的相关文献进行可视化处理,综述了国内外高浓度有机废水研究现状。该领域近十年来我国研究热点集中于高浓度有机废水的“零排放”、资源化利用、膜处理、生化-物化技术方面的研究。并结合现有问题从组合工艺高效处理废水与低成本资源化方向提出可行性建议,包括:1)针对性组合工艺发展,因地制宜实现高浓度有机废水高效、绿色、低价处理;2)开发新型水处理技术,实现低成本、低碳化、高效率工艺升级;3)提升资源化效率,实现水、盐、贵金属和高值有机物甚至是过程中产生热能的回收利用,提升低值废盐等的高值利用;4)模块化和智能化,结合人工智能等实现处理单元模块化、智能化等,升级环保产业新质生产力。
