焦化废水对蚕豆和大麦毒性的影响

以COD作为主要参照指标,研究了焦化废水在符合GB 13456-92<钢铁工业水污染物排放标准>焦化一级、二级排放标准限值要求时,对蚕豆和大麦幼根生长、根尖细胞遗传毒性的影响.结果表明:在实验周期内,焦化废水对蚕豆幼根根长、根重和有丝分裂指数的影响不大;对大麦幼根根重无明显影响,而对大麦根长和有丝分裂指数有促进作用.焦...     

低温水解酸化-A~2/O（PACT）-混凝沉淀处理印染废水

低温条件下对水解酸化-A2/O（PACT）-混凝沉淀组合工艺处理印染废水进行了中试研究。考察印染废水中COD和色度去除效果,结果表明：低温对工艺负面影响较大,未加粉末活性炭时好氧段COD和色度的去除率分别为42.6%和58.9%;投加粉末活性炭后,去除率分别达55.8%和65.4%,提高了13.2%和6.5%,显示出低...     

印钞废水处理工艺的改进实验

印钞废水属高浓度难降解有机废水,对环境污染严重。鉴于现有处理工艺出水普遍不达标的情况,通过对比实验确定了改进方案:超滤浓缩液离心出水在进入接触氧化池前,增加新的处理单元(Fenton氧化-混凝)。Fenton氧化最佳条件:FeSO4.7H2O投加量14 g/L,H2O2的投加量34 mL/L,初始pH值6.0,氧化反应时间1.5h,温度18.8℃;混凝过程最佳条件:PAC投加量4 g/L,PAM(5‰)投加量10 mg/L,pH值7。新增单元对废水中COD去除率接近80%,可生化性提高1.6倍,色度降低36%。     

Impacts of wastewater sludge amendments in restoring nitrogen cycle in p-nitrophenol contaminated soil

The possible impacts on nitrogen-cycle in a p-nitrophenol (PNP) polluted soil and the e ectiveness of wastewater sludge amendments in restoring nitrification potential and urease activity were evaluated by an incubation study. The results indicated that PNP at 250 mg/kg soil inhibited urease activity, nitrification potential, arginine ammonification rate and heterotrophic bacteria counts to some extents. After exposure to PNP, the nitrification potential of the tested soil was dramatically reduced to zero over a period of 30 days. Based on the findings, nitrification potential was postulated as a simple biochemical indicator for PNP pollution in soils. Nitrogen-cycling processes in soils responded positively to the applications of wastewater sludges. A sludge application rate of 200 tons/ha was su cient for successful biostimulation of these nitrogen processes. The microbial activities in sludge-amended, heavy PNP-polluted soils seemed to recover after 30–45 days, indicating the e ectiveness of sludge as a useful soil amendment.     

Preparation and coagulation efficiency of polyaluminium ferric silicate chloride composite coagulant from wastewater of high-purity graphite production

The aim of the present work was to produce a polyaluminium ferric silicate chloride (PAFSiC) coagulant from acidic and alkaline wastewater of purifying graphite by roasting, and subsequently to evaluate coagulation efficiency of the reagent by treating surface water from the Yellow River as well as municipal wastewater in comparison with the conventional coagulant polyaluminium chloride (PAC). The PAFSiC coagulant was prepared by co-polymerization. The effects of (Al+Fe)/Si molar ratio, OH/(Al+Fe) molar ratio (i.e., value), coagulant dosage and pH value of test suspension on the coagulation behavior of FAFSiC and the stability of the PAFSiC were also examined. Results showed that PAFSiC performed more efficiently than PAC in removing turbidity, chemical oxygen demand (COD), and total phosphate (TP). The PAFSiC with a value of 2.0 and (Al+Fe)/Si ratio of 5 (PAFSiC 2.0/5) showed excellent coagulation effect for both turbidity and COD, while PAFSiC 1.0/5 was the best for TP. The optimum coagulation pH range of PAFSiC 2.0/5 was 5.0–9.0, slightly wider than that of PAC (6.0–8.0). The process can be easily incorporated into high-purity graphite production plants, thereby reducing wastewater pollution and producing a valuable coagulant.     

Effect of anaerobic digestion on the high rate of nitritation, treating piggery wastewater

Laboratory reactors were operated by using piggery wastewater and the effluent of anaerobic digester from piggery wastewater plants to study the effect of anaerobic digestion on nitritation rate.     

改性膨润土处理污水处理厂二级出水的实验研究

研究基于再生水回灌地下、补充地下水水源的目的,使用河南信阳某膨润土厂生产的钠基膨润土,通过酸改性、铝柱撑改性和微波-硫酸亚铁改性制得三种改性膨润土,用于处理城市污水处理厂的二级出水.实验结果显示,经XRD衍射分析可知,三种方法制备的改性膨润土,其矿物结构都有不同程度上的变化,膨润土层间距都较膨润土原矿有所增大,可见其改...     

免烧粉煤灰陶粒作为BAF填料处理城市污水

以电厂粉煤灰为主要试验原料,辅以外加药剂(水泥、石灰、石膏、水玻璃),经混合、成球、陈化和养护等工序,制得免烧粉煤灰陶粒,并将其作为曝气生物滤池(BAF)工艺的载体填料处理城市污水.待挂膜启动成功后,考察了水力停留时间( HRT)、COD负荷、氨氮负荷对COD和氨氮去除效果的影响.实验结果表明:在温度为18～21℃、气...     

广西近岸海域水质自动监测系统组成及其性能检测

广西近岸海域水质自动监测系统是一套以在线自动分析仪器为核心,运用现代传感器技术、自动测量技术、自动控制技术、计算机应用技术以及相关的专用分析软件和通讯网络所组成的一个综合性的在线自动监测体系。该系统可自动实现采样、分析、记录、数据处理及远距离数据传输等在线过程。文章介绍了该系统组成情况及其性能检测要点。     

Fenton氧化在废水处理中的应用

综述了近年来Fenton氧化在废水处理领域的应用状况,对Fenton试剂氧化的机理和主要影响因素:温度、pH、反应时间、H2O2和Fe2+的投加量、H2O2/Fe2+量比以及反应动力学模型进行了简要介绍.最后探讨了Fenton氧化技术在废水处理领域现存不足之处及今后的发展趋势.