共查询到19条相似文献,搜索用时 203 毫秒
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本实验以城市污水处理厂污泥为原料,通过投加营养液和Na2S进行污泥驯化,培养出富含S2-降解菌的活性污泥,实验结果表明,通过两周连续投加Na2S的驯化,反应器内微生物已经达到稳态,活性污泥较为成熟,沉降比约为46%,SVI约为7 mL/g,MLSS约为6.6 g/L,S2-的去除率达到90%。 相似文献
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驯化耐盐活性污泥处理高盐度工业废水 总被引:5,自引:2,他引:5
以某石化企业废水处理厂纯氧曝气池剩余污泥为接种污泥,采用逐步提高盐度负荷的方法对活性污泥进行耐盐性驯化,考察了驯化效果.结果表明,经过较长时间的驯化,活性污泥微生物能够适应高盐度的生存环境并能在其中生长、繁殖.驯化后的活性污泥能较好地抵御高盐度冲击负荷.在进水TDS为18~35 g/L的条件下,驯化后的活性污泥纯氧曝气池对高盐度工业废水中COD的平均去除率为85.7%,比原废水处理厂常规活性污泥纯氧曝气池的高出近10%.该驯化方法可以驯化出能耐受较高盐浓度并具有良好COD降解性能的耐盐活性污泥. 相似文献
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城市污水处理厂Orbal氧化沟的调试和运行 总被引:2,自引:0,他引:2
以西南某污水处理厂的Orbal氧化沟为例,采用接种培养和间歇培养相结合的方法进行调试,结果表明该方法可行。运行中控制厌氧池DO≤0.2mg/L,外沟DO〈0.5mg/L,中沟DO为0.5—1.5mg/L,内沟DO为2.0~3.0mg/L,污泥回流比为100%,MLSS为3500~4000mg/L,可以取得较好的处理效果。此外,还对运行中存在的问题进行了分析。 相似文献
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针对某城市污水处理厂活性污泥系统中产生的仙女虫进行防治对策研究.由于仙女虫的吞噬作用使得活性污泥的絮体结构遭到破坏,造成二沉池表面出现浮泥,出水悬浮物浓度高达116 mg/L,生物反应池内污泥浓度大幅降低,对COD、氮和磷的去除效率下降.采用排除二沉池表面的浮泥、减小污泥龄、降低曝气池中的溶解氧浓度和添加初沉池污泥等措施后,仙女虫消失,污泥浓度逐渐增加到2 252 mg/L,出水SS降低至20 mg/L以下,系统恢复正常.通过投加初沉池污泥以提高有机负荷是防治仙女虫的有效途径. 相似文献
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不同接种污泥对UASB反应器处理毒性有机废水的影响 总被引:3,自引:0,他引:3
对未经培养的城市污水处理厂消化污泥和经短期培养的城市污水处理厂消化污泥分别作为UASB反应器的接种污泥,进行了处理含有毒性物质树脂生产废水的比较试验,由于毒性物质的存在,消化污泥直接作为UASB反应器的接种污泥时,不能形成活性高、沉淀性能良好的颗粒污泥,因此反应器的容积负荷低、出水SS高,污泥流失,为了维持系统的稳定运行,必须采取污泥回流的措施;经短期培养的消化污泥作为UASB反应器的接种污泥时, 相似文献
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多点交替进水五箱一体化活性污泥法脱氮除磷研究 总被引:1,自引:1,他引:1
为了获得较高的氮、磷去除效率,在UNITANK工艺的基础上,开发了一种新型的城市污水脱氮除磷工艺——多点交替进水五箱一体化活性污泥法,并在南京某污水处理厂开展了中试研究。连续一年的稳定运行表明,在进水COD、BOD5、TP、NH3-N、TN分别为110~430、52~130、2.2-6.1、15~41、17-50mg/L的情况下,出水水质可稳定地达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)的一级A标准.除磷率和脱氧率分别可达90%和70%以上. 相似文献
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采用分段进水生物脱氮工艺处理小区生活污水,考察了在低DO条件下,不同曝气方式对硝化率及污泥沉降性能的影响。结果表明,在曝气量为0.27m^3/h、MLSS平均为2700mg/L左右、好氧区的DO为0.26~2.5mg/L的条件下,当进水氨氮为44~55mg/L时,对氨氮的去除率保持在95%以上,对COD的去除率〉90%;当控制好氧区第1、2格室的DO分别为0.5~0.7和1.0~1.2mg/L时,系统的硝化率维持在90%以上,出水中的氨氮〈2mg/L;在恒定曝气量下,向进水中投加有机碳源,当水质改变较快时,容易引起丝状菌污泥膨胀,但通过恒DO曝气控制,可使污泥的沉降性能得到改善。 相似文献
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丝状菌污泥膨胀是影响活性污泥法高效、稳定运行的重要因素。采用A/O生物除磷工艺中试装置处理实际生活污水,分析了污泥膨胀发生的原因及恢复系统性能的方法。结果显示,长期曝气不均匀是导致丝状菌污泥膨胀的重要原因,通过调控系统运行参数可以有效控制由低DO值或者高负荷引起的丝状菌污泥膨胀。当发生污泥膨胀后,首先降低负荷至0.45 kgCOD/(kgMLSS.d),调节回流比为83%,同时控制好氧池各段的DO分别为1.5、1.0、1.0 mg/L以淘汰丝状菌,在SVI值降至200 mL/g以下后继续降低回流比至53%,同时降低曝气量以形成1.0、0.5、0.5 mg/L的DO浓度梯度。采取上述调控措施后,SVI值由569.8 mL/g降至150 mL/g以下,污泥性状得以恢复;同时出水COD和TP分别在50、0.5 mg/L以下,去除率分别约为85%、95%。 相似文献
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多功能微生物制剂用于污泥减量的研究 总被引:2,自引:3,他引:2
目前如何减少剩余污泥的产量已成为污水处理的研究热点。为此,基于目前主要的污泥减量理论,在自然界中分离、筛选出一些特殊的微生物菌种,在特定培养工艺下研制一种多功能微生物制剂(MCMP)用于污泥的减量。采用该微生物制剂在重庆长寿污水处理厂进行中试:设3套相同装置,均采用常规活性污泥法且运行操作相同,其中两套装置分别投加所处理水量0.005%和0.01%的微生物制剂,一套不投加,对比其污泥减量效果。试验结果表明:投加MCMP的两套装置的污泥减量比例分别为81.76%和89.18%,3套装置的污泥增长速率分别为2.0%、1.5%和11.5%;投加MCMP能提高出水水质,3套装置出水的COD、NH3-N平均浓度分别为35.08、33.89、36.51mg/L和1.40、1.22、1.62mg/L。投加MCMP不用增设专用的处理单元,也不需改变原有的处理设施及运行方式。3套装置的曝气量相同,因而投加MCMP不会增加整个系统的动力消耗。该制剂具有良好的污泥减量效果,能减轻污水处理厂污泥处理、处置的负担。 相似文献
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The air feed rate to meet a given oxygen uptake rate in the activated sludge aeration tank was expressed by using the concept of the air diffuser performance, previously proposed by the present authors. Using the relationship between the BOD removal and the oxygen uptake rate, a procedure to predict the power economy, which is defined as the amount of BOD removed per unit power consumption of the air feeding, and the effluent quality of the activated sludge process under various operating conditions was presented. The effect of operating parameters in the tank; the MLSS concentration; the hydraulic retention time and the BOD loading on the power economy and the effluent quality were extensively evaluated. The results calculated by the proposed procedure were compared with the statistic data of operating conditions in the municipal wastewater treatment plants in Japan. A method to improve the effluent quality while maintaining a high power economy was also discussed. 相似文献
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Performance of laboratory scale completely mixed activated sludge reactors fed with abattoir wastewater was measured at different dissolved oxygen (DO) concentrations. Degradation of fat present in the influent was inhibited at DO concentrations below about 0.5 mg l−1, leading to sludges with high fat content which settled poorly due to excessive numbers of filamentous microorganisms. Fat was degraded rapidly at higher DO concentrations (up to 4.0 mg l−1) and the sludge contained few filamentous microorganisms, a low fat content and settled readily. However, effluent quality was highest at low DO concentrations due to lower levels of soluble breakdown products from the fat.When wastewater was fed intermittently at constant aeration rate, sludge with a low fat content and good settleability resulted, even though the DO concentration was about 0.2 mg l−1 for more than 30% of the time. Effluent quality was also high. Thus it is concluded that for full-scale abattoir treatment plants where wastewater flow is intermittent, DO concentration may be low during periods of high loading without adversely affecting effluent quality or sludge settleability. 相似文献
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The purpose of this study is to find the behavior of nitrogen and phosphorus during aerobic digestion. Waste activated sludge samples from a municipal wastewater treatment plant were digested under 30 days batch operation, aerating continuously and intermittently. If the cycle time of intermittent aeration was decided so that the DO in a digestion tank did not become zero, the reduction rate of sludge solids and the behavior of nitrogen and phosphorus in the intermittent aeration were similar to those in the continuous aeration. The percentage of biomass nitrogen (phosphorus) in the initial total nitrogen (phosphorus) decreased and finally became 20% (30%). Forty per cent of the initial MLSS remained finally. On the other hand, the percentage of liquid phase nitrogen (phosphorus) increased during digestion and reached 60% (70%). It is considered that considerable portion of the initial total nitrogen (phosphorus) remains in liquid phase after aerobic digestion under sufficient supply of oxygen. Contents of nitrogen and phosphorus in residual biomass increased a little and decreased thereafter. Also, contents of them in reduced biomass increased monotonously. 相似文献