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1.
印染废水出水回用与实践   总被引:4,自引:0,他引:4  
采用过滤-碳纤维吸附工艺对印染废水一级出水进行深度处理,废水COD可由80 mg/L降至30~40mg/L,出水水质完全满足生产工艺回用水要求.该技术具有工艺简单、投资少、运行费用低、操作简单等优点,特别适用于水资源短缺的中小印染企业.  相似文献   

2.
混凝—水解酸化—好氧工艺处理印染废水的设计与运行   总被引:3,自引:0,他引:3  
采用混凝-水解酸化-好氧工艺处理印染废水,设计规模3000m3/d.当进水C0D在571~1752 mg/L时,处理后的出水可达国家<污水综合排放标准>(GB 8978-1996),主要污染物ρ(C0D)<100mg/L.  相似文献   

3.
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   

4.
常规组合工艺-稳定塘-湿地系统处理印染废水   总被引:1,自引:1,他引:0  
针对工业园区印染企业产生的印染废水和生活污水,采用独特的"常规组合工艺与‘植物稳定塘-人工湿地系统’联合工艺"对其进行集中统一处理,并考察了运行效果。数据结果表明,系统出水COD、BOD5、SS、色度、NH3-N和TP平均分别为63.2 mg/L、13.8 mg/L、5.0 mg/L、49倍、0.2 mg/L和0.4 mg/L,出水水质达到国家污水综合排放一级标准(GB8978-1996)。该工艺运行稳定,可有效去除废水中的COD、SS和色度,去除率均在90%以上。按日均处理量4×104m3计算,此工艺每年将削减COD排放近30万t。  相似文献   

5.
ClO2氧化/TiO2复合吸附剂协同体系处理印染废水的实验研究   总被引:1,自引:0,他引:1  
利用ClO2 氧化/TiO2 复合吸附剂协同体系对处理实际印染废水进行了实验研究.结果表明,对于COD为750 mg/L、色度为250倍、SS为100 mg/L的1 000 mL印染废水,当溶液pH为4.0、ClO2 用量20 mg/L、TiO2 复合吸附剂用量2.5 g、反应时间和吸附时间分别为2、8 min时,处理后的废水COD<100 mg/L、色度<40倍、SS<70 mg/L,达到了《纺织染整工业水污染物排放标准》(GB 4287-92)排放要求.并对两者的协同机理进行了理论上的探讨.  相似文献   

6.
ABR-好氧颗粒污泥处理黄连素废水的启动研究   总被引:1,自引:0,他引:1  
实验研究了ABR-好氧颗粒污泥组合工艺处理黄连素制药废水的启动运行,通过分析发现,ABR装置在HRT为4 d,黄连素浓度为50 mg/L的运行方式下成功启动,反应器运行稳定后每个格室MLSS平均值分别为25 840、21 560、27 500和11 200 mg/L。以ABR出水为营养物,成功培养出粒径在2~10 mm,沉降速率为104~137 m/h,沉降性能优良的好氧颗粒污泥。该组合工艺在启动实验的末期,进水COD浓度为3 000~4 000 mg/L左右,出水COD浓度到达168.4~271mg/L,系统总的去除率保持在90%~95%之间,表明ABR-好氧颗粒污泥组合工艺能够有效地处理黄连素制药废水。  相似文献   

7.
采用B/A法对印染废水处理工艺条件控制进行系列试验.探索了微生物种群与有机污染物降解率的关系.获得了提高水质达标率的数据:COD<90 mg/L,BOD5<20 mg/L,挥发酚<0.5 mg/L,石油类<0.5 mg/L,NH3-N<15 mg/L;CN-<0.5 mg/L,S2-<1 mg/L,pH在6~9范围内,筛选优化B/A法处理印染废水的工艺设计.  相似文献   

8.
采用水解-酸化+SBR工艺处理啤酒废水,当进水浓度在800~2 500 mg/L,处理规模达到3 000 m3/d,经处理后的出水可达国家<综合污水排放标准>(8978-1996),主要污染物ρ(COD)<100 mg/L.  相似文献   

9.
介绍了UASB-接触氧化-气浮工艺处理柠檬酸废水的工程应用.工程运行表明,柠檬酸废水在进水SS、COD和BOD5分别为3427 mg/L、18 853 mg/L和11778 mg/L的条件下,经该工艺处理后,外排废水SS、COD和BOD5浓度分别为147.5 mg/L、223 mg/L和51.9 mg/L.该工艺具有占地面积小、工程投资和运行费用低及处理效果稳定等特点,能广泛应用于柠檬酸废水的处理.  相似文献   

10.
UASB-接触氧化-气浮处理柠檬酸废水   总被引:3,自引:0,他引:3  
介绍了UASB-接触氧化-气浮工艺处理柠檬酸废水的工程应用.工程运行表明,柠檬酸废水在进水SS、COD和BOD5分别为3427 mg/L、18 853 mg/L和11778 mg/L的条件下,经该工艺处理后,外排废水SS、COD和BOD5浓度分别为147.5 mg/L、223 mg/L和51.9 mg/L.该工艺具有占地面积小、工程投资和运行费用低及处理效果稳定等特点,能广泛应用于柠檬酸废水的处理.  相似文献   

11.
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   

12.

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   

13.
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   

14.
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   

15.
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   

16.
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   

17.
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   

18.
19.
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   

20.
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   

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