Treatment of Synthetic Olefin Plant Wastewater at Various Salt Concentrations in a Membrane Bioreactor     

Fatemeh Sadeghi  Mohammad Reza Mehrnia  Ramin Nabizadeh  Mohammad Hossein Sarrafzadeh 《洁净——土壤、空气、水》2012,40(4):416-421

The objective of this study was to investigate the effect of salt concentration on performance of a membrane bioreactor (MBR) for treating an olefin plant wastewater. For this purpose, a lab‐scale submerged MBR with a flat‐sheet ultrafiltration membrane was used for treatment of synthetic wastewater according to oxidation and neutralization unit of olefin plant. The synthetic wastewater was adjusted to have 500 mg/L chemical oxygen demand (COD). Trials on different concentrations of sodium sulfate (Na₂SO₄) (0–20 000 ppm) in the feed were conducted under aerobic conditions in the MBR. The results showed that increasing the salt concentrations causes an increase in the effluent COD, phenol, and oil concentrations. These results are due to reduction of the membrane filtration efficiency and also decline in the microbial activity that it is indicated by decreasing the sOUR in MBR. But in all the trials, the effluent COD and oil concentration was well within the local discharge limit of 100 and 10 mg/L, respectively. These results indicate that the MBR system is highly efficient for treating the olefin plant wastewater, and although high salt concentrations decreased organic contaminant removal rates in the MBR, the effluent still met the discharge limits for treating the olefin plant wastewater.  相似文献   

Electro‐Fenton Degradation of Methylene Blue Using Polyacrylonitrile‐Based Carbon Fiber Brush Cathode          下载免费PDF全文

Guangsen Xia  Yonghong Lu  Xueli Gao  Congjie Gao  Haibo Xu 《洁净——土壤、空气、水》2015,43(2):229-236

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The flux of land-based source pollutants from tumen river system entering the sea of Japan     

Yin Xingjun  Yin Chengqing 《中国地理科学(英文版)》1997,8(3):239-245

The influence of land-based source pollutants to marine ecological environment is principally in coastal or enclosed sea wates. Flux of land-based source pollutants into the sea will be effected due to social and economic development in the Tumen River basin. Pollutant type and primary pollution factor of the Tumen River in Northeast China is described by weighted coefficient method in this paper. The results indicate that the river is organic pollution type and primary pollution factor is COD. Fresh water fraction proves that the estuary is not affected by tide cycle. COD annual flux entering the Sea of Japan calculated by zero-dimension model in 1993 was 90.50 × 10³ tons. It is estimated with emission coefficient method that the COD will be 176.4 × 10³ and 458.6 × 10³ tons for the years of 2000 and 2010 respectively. This work is sponored by the Open Fund of State Key Laboratory on Environmental Aquatic Chemistry.  相似文献   

自然河流中污染物排放的一种远区计算模型     

侯国祥  张勇传  翁立达  邓联木  叶闽 《水文》2002,22(1):23-26

建立了一个适合于自然河流中污染物排放的远区二维深度平均计算模型,此模型采用了自然河流中的大尺度湍流模拟理论,在离散过程中采用了上风格式及Peaceman-Rachford交替格式和Douglas交替格式,并应用于国内多条大、中、小型河流的污染物排放计算中,取得了广泛的成功。  相似文献   

催化氧化糖蜜酒精废液催化剂的制备     

付全意  李坚斌  王彦玲  刘慧霞  扈胜禄 《矿产与地质》2006,20(3):313-316

根据内电解-催化氧化法的应用特点,选用颗粒活性炭作为催化剂的载体,采用浸渍法制备催化剂,并通过用不同催化剂对糖蜜酒精废液COD去除率的比较,确定最佳的催化剂制备条件:Cu(NO3)2浓度为7.5%,浸渍12h,260℃~300℃焙烧活化10~14h;多次使用后的Cu-AC催化剂由催化剂再生技术再生,并应用于糖蜜酒精废液处理。  相似文献   

SBR法处理人工配制味精废水的实验研究     

邓靖  王学刚  张国庆  卢颖 《华东地质学院学报》2006,29(3):261-264

采用内径为140 mm,高为250 mm的圆柱形SBR反应器进行试验,探讨SBR工艺对人工模拟配制味精废水的处理效果。通过实验分析了不同曝气时间、温度、进水浓度及污泥浓度与SBR处理效果之间的关系,确定了SBR法处理中浓度味精废水的最佳运行参数。实验结果表明,废水浓度在2 000~4 000 mg/L,温度为25℃时连续曝气6 h,污泥浓度在4 000~7 000 mg/L的条件下对人工味精废水中的COD具有较好的降解能力,COD cr的去除率可达80%。  相似文献   

皂素生产废水后续处理方法的选择     

宋凤敏  葛红光 《华东地质学院学报》2007,30(3):291-293

用EM菌—活性污泥法和混凝法两种方法对经一次处理过的皂素生产废水进行二次处理,比较两种方法的处理效果。结果表明,在最佳条件下EM菌-活性污泥法对废水处理效果较好,最后出水可达排放标准;而混凝方法对废水处理的效果甚小,可以得出皂素生产废水不宜用混凝方法来预处理或后处理。  相似文献   

A decade of variation of COD in the Changjiang River （Yangtze River） and its variation trend analysis     

WANG Fushun WANG Yuchun ZHANG Jing 《中国地球化学学报》2007,26(4):366-373

The average annual value of COD (chemical oxygen demand) fluxes of the Changjiang River (Yangtze River) and its main tributaries in the past decade (i.e., 1991–2000), has been evaluated. Based on the data from the Datong Hydrological Station (DHS), it was found that the Dongting Lake drainage basin contributed the greatest water discharge (35.8%) and COD flux (48.3%) among the main tributary drainage basins, followed by the Poyang Lake drainage basin with the contributions of 15.4% and 19.3%,respectively. By the end of the year of 2000, COD flux in the Changjiang River rose by almost 45% relative to that in the year of 1991, reaching about 1941000 ton/a at DHS. Statistical analysis revealed that industrial wastewater discharge, as well as COD in it, was found decreasing in the same period, due to the gradual reinforcement of environmental management. Moreover, correlation analysis indicated that non-point pollution from agriculture and increasing discharge of domestic sewages caused by rapid growth of population along the Changjiang River drainage valley should be responsible for the high COD. Furthermore, with the current trend of population growth and agricultural development in this basin, water quality of the Changjiang River, in terms of COD level, is going to deteriorate in the near future. Thus, the rational applications of fertilizers and pesticides in agriculture and the proper treatment of domestic sewages before they are discharged would be the most concerned controlling parameters.  相似文献   

双台子河口水体有机碳分布特征研究   总被引：1，自引：0，他引：1  

于文涛  邹立  文梅  张亚昆 《中国海洋大学学报(自然科学版)》2015,45(2):101-108,126

于2011年5月和8月通过研究双台子河口水体溶解有机碳(DOC)、颗粒有机碳(POC)和化学耗氧量(COD)的分布特征,阐述双台子河口水体有机碳的河口过程及其影响因素,并探讨总有机碳(TOC)和COD表征河口有机污染的区域性和季节性特征。研究表明:2011年5月双台子河口DOC、POC和COD含量范围分别为4.04~5.06mg/L(平均4.60mg/L)、2.93~10.85mg/L(平均7.01mg/L)和5.65~14.07mg/L(平均9.04mg/L);8月分别为10.87~46.04mg/L(平均26.75mg/L)、0.88~17.27mg/L(平均4.16mg/L)和2.42~67.62mg/L(平均17.85mg/L)。DOC、POC和COD的含量由河到海总体呈现逐渐降低的趋势,双台子河口不同区段DOC、POC和COD的时空分布,及其主要和次要影响因素具有一定的差别。有机碳来源和海水的稀释作用是影响双台子河口有机碳分布的主要因素,现场生物生产和悬浮颗粒物影响较小。双台子河口水体中TOC和COD呈现线性不显著正相关关系,二者关系的季节差异显著。  相似文献   

中国近海海水紫外吸收及直接用于测定海水COD     

应骏  陈国华  黄磊  侯进  晋治涛 《中国海洋大学学报(自然科学版)》2005,35(2):313-316,312

为探讨海水水质监测的简便可行方法,对渤海、北黄海、胶州湾、东海、长江口、南海及珠江口几百个海水样品紫外扫描发现,不同海区海水紫外吸收约在200～220nm之间。其中渤海、北黄海与胶州湾海水样品在208～210nm之间,而东海、长江口、南海及珠江口水样在205nm附近。海水紫外吸收吸光度与高锰酸钾法测COD值之间具有良好的线性关系。所以提出了用紫外分光光度法测定海水COD值的方法,发现紫外分光光度法与碱性高锰酸钾法测定海水COD值无显著性差异,可以满足快速监测的需要。  相似文献