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采用水解酸化-活性污泥-物化工艺联合处理含碱减量印染生活综合污水,采取预曝气、污泥回流和分级沉淀等措施,COD.去除率约为89.1%,脱色效果达86%,最终出水水质达到<纺织染整工业污染物排放标准>(GB4287-92)规定的二级排放标准.运行结果表明该工艺具有耐冲击负荷能力强,剩余污泥量少,难降解有机物去除率高等优点,在含碱减量印染废水处理中具有实用性. 相似文献
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厌氧水解酸化-生物接触氧化工艺处理印染废水 总被引:1,自引:0,他引:1
印染废水的色度大,有机物含量高,可生化性差。针对这些特点,采用了厌氧水解酸化-生物接触氧化、气浮等工艺处理印染废水,结果表明,该工艺对印染废水有很好的处理效果,最终出水基本无色,达到纺织染整工业水污染物排放的一级标准(GB4287--1992),处理成本较低。 相似文献
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化学絮凝—微电解脱色处理印染废水 总被引:4,自引:0,他引:4
采用化学絮凝-微电解脱色组合工艺处理扬州彩虹针织集团总厂生产过程中的印染废水,COD去除率达到83%~90%.处理后的出水清澈透明,各项指标均达到GB8978-1996《污水综合排放标准》的二级排放标准。 相似文献
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采用泥回流处理彩色显像管含氟废水 总被引:1,自引:0,他引:1
本文通过中和、混凝沉降法除氟过程,研究了彩色显像管工业废水除氟的适宜工艺条件,现场试验表明:应用泥回流处理技术,采用高效絮凝剂处理含氟废水,排放废水氟含量可稳定在4-6mg/L之间,低于排放标准(10mg/L),同时废水处理的成本大大降低。 相似文献
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方便面和饮料生产废水处理技术 总被引:1,自引:0,他引:1
采用高效气浮-活性污泥法组合工艺处理方便面和饮料生产废水。工程运行实践表明,该工艺处理效果好、运行稳定。各项指标均可达到GB8978-1996《污水综合排放标准》的二级排放标准。 相似文献
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采用絮凝—膜生物反应器(MBR)组合工艺进行印染废水处理的试验研究.结果表明,调节pH至8.5、搅拌时间为30min时,COD和色度去除效果最佳;而单纯絮凝工艺对印染废水处理效果不理想,最佳运行条件为64 mg/L NaOH+75 mg/L饱和石灰水+0.2 mg/L聚丙烯酰胺(PAM)+3 mg/L硅酸钠+8 mg/L聚合氯化铝(PAC),COD和NH3-N平均去除率分别达到23.91%、31.17%.在上述最佳运行条件下,采用絮凝—MBR组合工艺处理印染废水,效果较显著;出水COD均值可达42.2mg/L,其平均去除率为91.62%;出水NH3-N均值可达6.26 mg/L,其平均去除率为92.43%,出水水质可达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级B标准. 相似文献
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The sorption and desorption of Cu and Cd by two species of brown macroalgae and five species of microalgae were studied. The two brown macroalgae, Laminaria japonica and Sargassum kjellmanianum, were found to have high capacities at pHs between 4.0 and 5.0 while for microalgae, optimum pH lay at 6.7. The presence of other cations in solution was found to reduce the sorption of the target cation, suggesting a competition for sorption sites on organisms. Sorption isotherms obeyed the Freundlich equation, suggesting involvement of a multiplicity of mechanisms and sorption sites. For the microalgae tested, Spirulina platensis had the highest capacity for Cd, followed by Nannochloropsis oculata, Phaeodactylum tricornutum, Platymonas cordifolia and Chaetoceros minutissimus. The reversibility of metal sorption by macroalgae was examined and the results show that both HCl and EDTA solutions were very effective in desorbing sorbed metal ions from macroalgae, with up to 99.5% of metals being recovered. The regenerated biomass showed undiminished sorption performance for the two metals studied, suggesting the potential of such material for use in water and wastewater treatment. 相似文献
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Soudamini Mohapatra 《Journal of environmental science and health. Part. B》2013,48(7):513-520
The persistence and dissipation kinetics of trifloxystrobin and tebuconazole on onion were studied after application of their combination formulation at a standard and double dose of 75 + 150 and 150 + 300 g a.i. ha?1. The fungicides were extracted with acetone, cleaned-up using activated charcoal (trifloxystrobin) and neutral alumina (tebuconazole). Analysis was carried out by gas chromatograph (GC) and confirmed by gas chromatograph mass spectrometry (GC-MS). The recovery was above 80% and limit of quantification (LOQ) 0.05 mg kg?1 for both fungicides. Initial residue deposits of trifloxystrobin were 0.68 and 1.01 mg kg?1 and tebuconazole 0.673 and 1.95 mg kg?1 from standard and double dose treatments, respectively. Dissipation of the fungicides followed first-order kinetics and the half life of degradation was 6–6.6 days. Matured onion bulb (and field soil) harvested after 30 days was free from fungicide residues. These findings suggest recommended safe pre-harvest interval (PHI) of 14 and 25 days for spring onion consumption after treatment of Nativo 75 WG at the standard and double doses, respectively. Matured onion bulbs at harvest were free from fungicide residues. 相似文献
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A R Main 《Journal of environmental science and health. Part. B》1983,18(1):29-63
The kinetic and structural relationships of eight electrophoretically pure mammalian serum and liver serine carboxylesterases (CE) and cholinesterases (ChE) have been studied. Eight CE's and ChE's, which were fully resolved but only partially purified, provided additional information. Five of the electrophoretically pure esterases were monomeric, and of these, four belonged to a new and widely distributed class. These four monomeric esterases hydrolyzed choline esters, but at widely differing rates. Thus two were termed monomeric butyrylcholinesterases, mBuChE I and II, and two were monomeric CE's (mCE). The rabbit liver mCE was not a subunit of the oligomeric CE (oCE), although the oCE also hydrolyzed choline esters at a very low rate. The complex kinetics of the mCE's, mBuChE's, oCE's, and of the oligomeric BuChE's of horse and human serum could be interpreted according to a single reaction scheme involving an allosteric site and the equation derived from it. Thus activation and inhibition at high substrate concentrations, together with sigmoidal activity versus substrate concentration plots, all of which characterize the reactions of these esterases, could be interpreted by a single scheme and equation. Structural and kinetic comparisons showed a progressive transition of properties from the oCE's through the mCE's to the oBuChE's. One of the purified mCE's was from horse serum, and it exhibited physical and kinetic properties unlike those of the liver mCE's or oCE's. 相似文献
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STEFANO POLATI FABIO GOSETTI VALENTINA GIANOTTI MARIA CARLA GENNARO 《Journal of environmental science and health. Part. B》2013,48(6):765-779
The bioavailability of pollutants, pesticides and/or their degradation products in soil depends on the strength of their sorption by the different soil components, particularly by the clay minerals. This study reports the sorption-desorption behavior of the environmentally hazardous industrial pollutants and certain pesticides degradation products, 3-chloroaniline, 3,4-dichloroaniline, 2,4,6-trichloroaniline, 4-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol on the reference clays kaolinite KGa-1 and Na-montmorillonite SWy-l. In batch studies, 2.0 g of clay were equilibrated with 100.0 mL solutions of each chemical at concentrations ranging from 10.0 to 200.0 mg/L. The uptake of the compounds was deduced from the results of HPLC-UV-Vis analysis. The lipophilic species were best retained by both clay materials. The most lipophilic chemical used in the study, 2,4,6-trichloroaniline, was also the most strongly retained, with sorption of up to 8 mg/g. In desorption experiments, which also relied on HPLC-UV-Vis technique, 2,4,6-trichloroaniline was the least desorbed from montmorillonite. However, on kaolinite all of the compounds under study were irreversibly retained. The experimental data have been modelled according to the Langmuir and Freundlich isotherms. A hypothesis is proposed concerning the sorption mechanism and potential applications of the findings in remediation strategies have been suggested. 相似文献
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Polati S Gosetti F Gianotti V Gennaro MC 《Journal of environmental science and health. Part. B》2006,41(6):765-779
The bioavailability of pollutants, pesticides and/or their degradation products in soil depends on the strength of their sorption by the different soil components, particularly by the clay minerals. This study reports the sorption-desorption behavior of the environmentally hazardous industrial pollutants and certain pesticides degradation products, 3-chloroaniline, 3,4-dichloroaniline, 2,4,6-trichloroaniline, 4-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol on the reference clays kaolinite KGa-1 and Na-montmorillonite SWy-l. In batch studies, 2.0 g of clay were equilibrated with 100.0 mL solutions of each chemical at concentrations ranging from 10.0 to 200.0 mg/L. The uptake of the compounds was deduced from the results of HPLC-UV-Vis analysis. The lipophilic species were best retained by both clay materials. The most lipophilic chemical used in the study, 2,4,6-trichloroaniline, was also the most strongly retained, with sorption of up to 8 mg/g. In desorption experiments, which also relied on HPLC-UV-Vis technique, 2,4,6-trichloroaniline was the least desorbed from montmorillonite. However, on kaolinite all of the compounds under study were irreversibly retained. The experimental data have been modelled according to the Langmuir and Freundlich isotherms. A hypothesis is proposed concerning the sorption mechanism and potential applications of the findings in remediation strategies have been suggested. 相似文献
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Singh Nishi Kumari Choudhary Sangeeta 《Environmental science and pollution research international》2021,28(42):58819-58836
Environmental Science and Pollution Research - Hydrocarbon is a primary source of energy in the current urbanized society. Considering the increasing demand, worldwide oil productions are declining... 相似文献
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PCDD and PCDF were found in urban air particulates from St. Louis and Washington, D.C., and in sediments from the Great Lakes and Siskiwit Lake, Isle Royale. The similarity between the PCDD and PCDF found in air particulates and sediment samples and the presence of PCDD and PCDF in sediment from Siskiwit Lake (a location which can receive only atmospheric inputs) suggest that these compounds are emitted to the atmosphere from combustion sources. The historical input of PCDD and PCDF to dated sediment cores shows a strong increase since 1940, and this suggests that the incineration of chlorinated organic compounds is an important source of PCDD and PCDF to the environment. 相似文献
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畜禽养殖业污染与循环经济 总被引:16,自引:0,他引:16
解决畜禽养殖业的污染问题要以充分利用资源为根本出发点,通过对污染全过程控制及废物综合利用,达到畜禽粪便的减量化、无害化、资源化,走循环经济的发展道路。 相似文献
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Recent reports have suggested that dietary and environmental estrogens such as organochlorine pollutants may play a role in the increased incidence of breast cancer in women and disorders of the male reproductive tract. For example, elevated levels of DDE and polychlorinated biphenyls (PCB) have been measured in women with breast cancer. However, it should also be noted that numerous environmental and dietary compounds have also been characterized as antiestrogenic and as inhibitors of mammary cancer cell growthin vitro and/orin vivo. Some of these compounds include 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and related compounds, polynuclear aromatic hydrocarbons (PAH), other naturally-occurring TCDD receptor agonists, retinoids, phorbol esters, terpenes, fatty acids, and polysaccharides. Thus, it is possible that dietary and environmental estrogens and antiestrogens may be contra-active, and these interactions must be considered in the overall risk assessment of the potential adverse human and environmental health impacts of these chemicals. 相似文献