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2.二级处理经一级处理后的废水,再经二级处理,用生化法进一步去除废水中的溶解性有机物,改善处理水水质。二级处理方式包括活性污泥法、生物膜法、氧化塘等。生化法是处理易被微生物降解的有机废水,对能被微生物降解的毒性有机物也有一定的解毒能 相似文献
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活性污泥法处理低浓度煤气化—焦化含酚废水 总被引:1,自引:0,他引:1
本文探讨了活性污泥法处理低浓度煤气化-焦化含酚混合废水的可行性。主要研究了低浓度煤气化-焦化含酚混合废水的生化处理效果与废水配比以及生化曝气时间之间的关系。 相似文献
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我国有机磷农药废水的生化法处理研究进展 总被引:6,自引:1,他引:6
农药废水的污染已受到国内外环保工作者的重视,我国也不例外。各种处理方法层出不穷,而生化法是处理方法中的重要方法,本文仅就我国生化法处理有机磷农药废水的研究进展作一概述。 相似文献
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农药废水的污染已受到国内外环保工作者的重视 ,我国也不例外。各种处理方法层出不穷 ,而生化法是各处理方法中的重要方法 ,本文仅就我国生化法处理有机磷农药废水的研究进展作一概述 相似文献
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水解酸化/好氧生化/Fenton氧化工艺处理制药废水的研究 总被引:3,自引:0,他引:3
进行了"水解酸化/好氧生化/Fenton氧化"工艺处理制药废水的试验研究,研究表明,该工艺的处理效果显著.水温为45~55℃时,经过16~20 h的水力停留时间,水解酸化可将废水的B/C比提高至0.30~0.35;好氧生化选用AB法,2~3 h曝气后的A段COD去除率可达到65%以上,7~9 h曝气后的B段COD去除率可达到40%以上;经过5~6 h的Fenton反应后,出水水质指标符合一级排放标准的要求. 相似文献
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高浓度硝基苯类废水处理工艺 总被引:2,自引:0,他引:2
介绍了“酸析-压滤-沉淀-AB法”工艺处理高浓度硝基苯类废水的改造工程,认为采用酸析-压滤-混凝沉淀或微电解-混凝初沉作预处理,能保证AB法生物处理高浓度硝基苯类废水达标排放。 相似文献
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Plackett-Burman法筛选污水中氨氮去除的主要影响因素 总被引:1,自引:0,他引:1
结合生产实际运行数据,分析了深圳市某污水处理厂A2O生物处理单元、AB生物处理单元、微絮凝过滤单元和次氯酸钠消毒单元等对氨氮的去除效果,采用基于蒙特卡罗(Monte-Carlo)模拟的概率统计方法对该厂再生水中氨氮符合相应标准的概率(保障率)进行了定量计算。结果表明,氨氮存在较大的超标风险,对此采用Plackett-Burman设计对全流程处理工艺中影响氨氮去除效果的因素进行了研究,筛选出了主要控制因子:混合液回流比、过滤池聚合氯化铝(PAC)投加量和接触池中次氯酸钠投加量,为进一步优化工艺参数提供了重要理论依据和实践基础。 相似文献
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氨吹脱-Fenton氧化预处理阿奇霉素废水的研究 总被引:1,自引:1,他引:0
采用氨吹脱-Fenton试剂氧化法对阿奇霉素废水进行预处理,考察了各种因素对处理效果的影响。实验结果表明:在pH值为11,吹脱时间160 min,温度30℃的条件下,氨氮浓度从2 458.7 mg/L降低到421.7 mg/L,去除率可达82.85%;Fenton氧化吹脱出水的适宜工艺条件:初始pH值为3、反应时间90 min、FeSO4·7H2O投加量为0.01 mol/L、H2O2/Fe2+的投加比16∶1,此时,COD去除率为72.6%;废水经预处理后,有效地改善了废水水质,提高了废水的可生化性,由初始的0.1增至0.37,为后续废水的生化处理提供了有利条件。 相似文献
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Daniel P. Smith Ph.D. P.E. 《Journal of the Air & Waste Management Association (1995)》2013,63(6):502-509
Abstract Nitrogen transformations and their effect on aerobic suspended growth treatment of an industrial wastewater were studied in three parallel bench-scale reactors operated at 5 "C at mean cell residence times (MCRT) of 15, 30, and 60 days. In normal process wastewater, the bulk of influent nitrogen was in organic form, and the fraction transformed was almost totally incorporated into synthesized biomass. Assimilative control by heterotrophs maintained ammonianitrogen levels below permitted effluent levels, and nitrification was not significant. Although volatile suspended solids had a nitrogen content of only 5% to 8%, effective organics removal was maintained, and total organic carbon and filtered daily average five-day biochemical oxygen demand (BODS) were below permitted effluent levels. A marked improvement in settleability and lower effluent total suspended solids was achieved by adding ammonia-nitrogen to the wastewater in excess of stoichiometric growth requirements. During a batch production cycle of a cationic chemical, the ratio of nitrogen to chemical oxygen demand and the fraction of the total influent nitrogen in soluble form increased in the wastewater. Reactor effluent ammonia levels increased to above permit levels at all three MCRTs during treatment of wastewater containing cationic production effluents. The magnitude of ammonia increase was greater for longer MCRTs, suggesting that synthesis of cell mass was not capable of assimilating the increased ammonia supply under these non-steady conditions. The experimental results suggest several potential strategies for operating the aerobic process at the treatment facility, including adding nitrogen to improve settleability and discontinuing these additions when wastewater contains a high ratio of nitrogen to chemical oxygen demand and an elevated soluble nitrogen fraction 相似文献
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一株高效异养硝化-好氧反硝化菌的分离鉴定及脱氮性能 总被引:6,自引:0,他引:6
从经驯化的污泥中筛选出一株异养硝化-好氧反硝化细菌,编号为TN-05,通过形态学特征观察,生理生化特征试验和核酸序列分析鉴定其为门多萨假单胞菌(pseudomonasmendocina)。同时对其进行脱氮性能研究,结果表明,TN-05具有较好的异养硝化能力,菌株在培养至48h时对总氮和氨氮去除率均能达95%以上。通过反硝化能力验证实验发现,菌株对NO3-N和N0f—N也分别具有较好的去除效率。将菌株应用于人工合成废水中,发现对废水中氨氮优先利用并能在24h时使去除率接近100%,对硝态氮和亚硝态氮也具有一定的去除效率。因此,菌株TN-05是一株同时具备异养硝化和好氧反硝化能力的高效菌株。 相似文献
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Advanced extraction and lower bounds for removal of pollutants from wastewater by water plants. 总被引:1,自引:0,他引:1
The capacity to reach lower bounds for extraction of pollutants from wastewater by four floating aquatic macrophytes--water hyacinth (Eichhornia crassipes), water lettuce (Pistia stratiotes), salvinia (Salvinia rotundifolia), and water primroses (Ludvigia palustris)--is investigated. It is shown that the following lower bounds can be established for wastewater purification with water hyacinth: biochemical oxygen demand (BOD), 1.3 mg/L; chemical oxygen demand (COD), 11.3 mg/L; total suspended solids (TSS), 0.5 mg/L; turbidity, 0.7 NTU; ammonia, 0.2 mg/L; and phosphorus, 1.4 mg/L. Also, the following lower bounds can be established for wastewater purification with water lettuce: BOD, 1.8 mg/L; COD, 12.5 mg/L; TSS, 0.5 mg/L; turbidity, 0.9 NTU; ammonia, 0.2 mg/L; and phosphorus, 1.6 mg/L. These lower bounds were reached in 11- to 17-day experiments that were performed on diluted wastewater with reduced initial contents of the tested water quality indicators. As expected, water hyacinth exhibited the highest rates and levels of pollutant removal, thereby producing the best lower bounds of the water quality indicators. Given the initially low levels, BOD was further reduced by 86.3%, COD by 66.6%, ammonia by 97.8%, and phosphorus by 65.0% after 11 days of a batch experiment. The capacity of water plants to purify dilute wastewater streams opens new options for their application in the water treatment industry. 相似文献
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本研究从水产养殖环境中分离出39株反硝化细菌,并从中筛选出具有较强反硝化能力的菌株DB-33,对其脱氮能力测定的结果表明,在培养基中亚硝酸盐氮浓度高达54.16mg/L,硝酸盐氮浓度高达306.91mg/L时,DB-33菌株对其去除率均达99%以上,且在去除过程中氨氮不累积;在模拟养殖水体中,DB-33可将亚硝酸盐氮和硝酸盐氮分别在24h和第3天彻底去除,对氨氮48h的去除率也可达51.52%。通过形态学特性和生理生化分析以及16SrDNA基因序列分析,菌株DB-33初步鉴定为施氏假单胞菌(Pseudomonasstutzeri)。 相似文献