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分别进行了炭砂复合滤池处理Ⅳ类~劣V类地表水的中试和生产性试验,并与常规过滤工艺进行对比.中试及生产性试验结果表明,GAC强化过滤工艺在去除浊度方面与常规过滤工艺相差不大,两种工艺的最终出水浊度都可达到《生活饮用水卫生标准》( GB 5749-2006)的要求;GAC强化过滤工艺在去除氨氮方面优于常规过滤工艺;GAC强化过滤工艺存在亚硝酸盐氮积累现象,但其硝化效果较普通砂滤池好;GAC强化过滤工艺的出水CODMn值基本能达到《生活饮用水卫生标准》( GB 5749-2006)的规定;炭砂复合滤池的硝化作用比较明显,对溶解氧的消耗量比较大,要加速硝化过程则需进行曝气充氧. 相似文献
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某污水处理厂采用曝气生物滤池(BAF)工艺,出水水质仅能达到国家二级排放标准,为使其达到国家一级A排放标准,拟采用前置反硝化BAF工艺进行升级改造,据此进行了中试启动研究。中试以污水厂实际进水为原水,处理规模为2 m3/d,采用自然挂膜方式,反硝化段和硝化段的体积比为1∶2,回流比为100%,各滤池的HRT均为0.67 h,CN池和N池的曝气量分别为0.82、1.0 m3/h。经过16 d的运行,出水COD、NH3-N和TN浓度分别稳定在50、5和15 mg/L以下,表明中试装置启动成功。 相似文献
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根据原水低浊、高藻、碱度及硬度偏低的特点,充分利用水厂现有构筑物进行升级改造,通过试验确定采用絮凝沉淀+活性炭滤池+超滤的净水工艺,并预留再矿化工艺。分析了中试系统的处理效果,并对升级改造的活性炭滤池、超滤膜等主要构筑物设计进行了阐述。 相似文献
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天津经济开发区第一污水处理厂升级改造工程出水水质执行<城镇污水处理厂污染物排放标准>(GB 18918-2002)的一级B标准,其中关键是保证TN、SS和TP达标,而且进水中Cl-浓度较高(1 500 mg/L),处理工艺需在高氯离子浓度下保证良好的处理效果.经比较,确定采用Denite(R) 深床反硝化滤池工艺,该滤池充分利用了现有反应沉淀池,具有土建投资省、施工周期短的特点,是污水厂升级改造中的优选工艺.通过中试,验证了Denite(R) 在设计条件下出水水质优于一级B标准. 相似文献
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Identification of wastewater sludge characteristics to predict critical flux for membrane bioreactor processes 总被引:7,自引:0,他引:7
The effects of sludge characteristics on critical flux were examined using a submerged membrane bioreactor pilot plant operated under different process conditions to treat municipal wastewater. The sludge in the membrane tank was characterized by measuring colloidal particle concentration, extracellular polymeric substances (EPS), mixed liquor suspended solids (MLSS), temperature, time to filter (TTF) and diluted sludge volume index (DSVI). The colloidal particle concentration was represented by the colloidal total organic carbon (TOC), which is the TOC difference between the filtrate passing through a 1.5 microm pore size filter and the permeate collected from pilot ultrafiltration membrane modules with a pore size of 0.04 microm. The results showed that the critical flux measured by the stepwise flux method was almost solely related to the colloidal TOC despite different sludges tested. In contrast, MLSS was shown to have little impact on the critical flux within the range examined. Neither TTF nor DSVI could be used to reliably predict the critical flux. Furthermore, colloidal TOC can be attributed to soluble EPS, but not bound EPS. Therefore, it is suggested that colloidal TOC be used as a new filterability index for MBR processes in wastewater treatment. 相似文献
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浙江某污水厂进水中含有70%的工业废水,具有有机物浓度高、冲击负荷大、乳化油浓度较高的水质特点,且出水水质要达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)中一级A标准。已建一期工程(2×104m3/d)采用AAO+高效沉淀池+滤布滤池工艺处理污水,出水有机物超标严重。为此,二期扩建工程(2×104m3/d)采用调节池+混凝气浮组合池+A/O生化池+高效沉淀池的工艺流程。设计中增设调节池调节进水水质水量;采用混凝气浮组合池去除进水中的乳化油,以避免对后续工艺运行造成干扰;延长生化池停留时间,强化对有机物的去除,避免在深度处理阶段设置高级氧化工艺,节省建设、运行费用;气浮污泥采用离心脱水,生物污泥采用带式脱水机处理。工程试运行期间出水水质稳定达到设计标准,直接运行成本为0.56元/m3。 相似文献
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某危废处置企业因处置危废来料变化及生产工艺调整,车间生产废水与设计水质发生变化,导致废水站原有处理工艺无法满足实际需求。针对实际生产废水特点及处理要求,对废水站进行了技术改造,将前端物化预处理改造为针对高浓度废水的Fenton预处理,生化池末端的二沉池改造为好氧池与MBR池,将消毒池改为深度氧化池。实践表明,改造后运行效果稳定,出水水质达到设计出水要求。 相似文献
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A novel application of TPAD-MBR system to the pilot treatment of chemical synthesis-based pharmaceutical wastewater 总被引:1,自引:0,他引:1
A pilot-scale test was conducted with a two-phase anaerobic digestion (TPAD) system and a subsequential membrane bioreactor (MBR) treating chemical synthesis-based pharmaceutical wastewater. The TPAD system comprised a continuous stirred tank reactor (CSTR) and an upflow anaerobic sludge blanket-anaerobic filter (UASBAF), working as the acidogenic and methanogenic phases, respectively. The wastewater was high in COD, varying daily between 5789 and 58,792 mg L(-1), with a wide range of pH from 4.3 to 7.2. The wastewater was pumped at a fixed flow rate of 1m(3)h(-1) through the CSTR, the UASBAF and the MBR in series, resulting in respective HRTs of 12, 55 and 5h. Almost all the COD was removed by the TPAD-MBR system, leaving a COD of around 40 mg L(-1) in the MBR effluent. The pH of the MBR effluent was found in a narrow range of 6.8-7.6, indicating that the MBR effluent can be directly discharged into natural waters. A model, built on the back propagation neural network (BPNN) theory and linear regression techniques, was developed for the simulation of TPAD-MBR system performance in the biodegradation of chemical synthesis-based pharmaceutical wastewater. The model well fitted the laboratory data, and was able to simulate the removal of COD. 相似文献
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针对初期雨水及合流制溢流水质和水量波动大而引起的调蓄工程处理能力不足、运行能耗高及难以有效收集高负荷合流制溢流污水等问题,通过对不同时期进入调蓄工程的合流制溢流水质和水量特征的分析,结合调蓄工程处理工艺的沿程水质分析,考察了"微砂高效沉淀池+接触氧化池+D型滤池"工艺对合流制溢流的实际处理效果。结果表明,初期雨水及合流制溢流均呈水质和水量波动大、高氨氮、低COD的特征,氨氮是调蓄处理工艺出水水质达标的关键指标;同时,生化处理单元进水COD浓度低的特征不利于接触氧化池的生物挂膜,降低了工艺的实际处理能力。因此建议:(1)在接触氧化池后设置混凝加药装置,以保证出水SS和TP达标排放;(2)接触氧化池采用多点进水方式,并预留碳源投加装置;(3)增加精确曝气控制系统,实现节能降耗。 相似文献