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以曝气生物滤池(BAF)处理河水时出水氨氮小于0.5mg/L为目标,通过试验室小试对几种新型塑料填料的挂膜性能、硝化速率等进行了对比研究,选出了最佳填料为4号。通过现场中试对4号填料的挂膜运行情况、气量要求、硝化速率及氨氮冲击负荷等情况进行了研究。结果表明,在试验条件下,4号填料完全能够满足处理要求。同时具有压力损耗低、反冲洗频率低的优点。 相似文献
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聚丙烯与沸石填料曝气生物滤池处理生活污水的研究 总被引:2,自引:0,他引:2
进行上向流单级曝气生物滤池处理生活污水的试验,对聚丙烯与沸石填料的处理效果和附着微生物特性进行比较.在BOD5容积负荷为3kg BOD5/(m3·d),NH3-N表面负荷为O.5 gNH3-N/(m2·d),气水比为10:1的室温运行状况下,聚丙烯与沸石填料滤池对CODCr的去除效率均达到85%以上,二者差异不大.聚丙烯填料滤池对NH3-N和TN去除率分别为87%和36 9/6;由于沸石的离子交换作用和内部的缺氧环境,滤池的硝化作用和TN的去除率分别提高了11%和19%.两种填料生物量和生物活性变化趋势相似,随着水流方向生物量逐渐降低,生物活性呈现明显的倒V形,微生物活性在有机物由富集转向缺乏时达到最高.试验结果表明,沸石填料的特殊结构更有利于提高工艺的脱氮效果,与聚丙烯填料相比更适合用于曝气生物滤池处理生活污水. 相似文献
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分别以瓷粒和陶粒作为曝气生物滤池的载体填料处理低浓度生活污水,对CODCr、NH3-N及SS的去除效果进行了比较研究,对生物膜的形态进行了观察.研究表明:在进水CODCr为30.8~184.8 mg/L、NH3-N平均值为25 mg/L、SS为61.2~206.9 mg/L,水力停留时间(HRT)分别为12 h、10 h、8 h、5 h和3 h时,两种填料处理后出水的CODCr、NH3-N和SS的去除率均分别可达80%、90%和80%以上,表明两种填料的去除效果基本相当. 相似文献
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对臭氧预氧化-曝气生物滤池(O_3-BAF)联合工艺深度处理城市污水二级处理出水中BAF系统的生物量及生物膜特性进行了研究.结果表明,在经过臭氧预氧化后的二级出水的COD_(Cr)仅有40~60 mg/L的低有机底物情况下,BAF系统内生物相仍十分丰富,系统内活跃着细菌、真菌、藻类、原生动物和后生动物等.沿BAF生物柱水流方向,不同填料层高度处微生物种群特征各有特点.沿水流方向不同填料层高度处,生物量和生物活性的变化趋势存在一定差异:生物量呈递减趋势,0.6 m范围内更加明显,之后趋于缓慢;生物活性在0.6 m范围内呈现一定的增加趋势,0.6 m以上则呈递减趋势. 相似文献
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通过中试考察了气水比对上流式曝气生物滤池(BAF)处理生活污水的影响。结果表明:在水力负荷为72 m3/(m2.h),水力停留时间为75 min,温度14~20℃的条件下,气水比为6∶1[气体流速为16.2 m3/(m2.h)]时,BAF能实现较好的同步除碳脱氮,CODCr、NH3—N及TN去除率分别为82%、84%和42%;当气水比为10∶1[气体流速为27 m3/(m2.h)]时,虽然NH3—N的去除率提高到88%以上,但碳氧化和反硝化受到限制,CODCr和TN去除效果分别降低为80%和31%;当气水比降至4∶1[气体流速为10.8 m3/(m2.h)]以下时,BAF对CODCr、NH3—N和TN的去除均受到限制,去除率分别低于68%、64%和27%。为达到较好的同步除碳脱氮效果,建议同步除碳脱氮BAF中气水比宜控制在6∶1左右。 相似文献
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An experiment was carried out to investigate the anti-ammonium shock load capacity of a biological aerated filter (BAF) composed of a double-layer bed. This bed was made up of a top layer of ceramic and a bottom layer of zeolite. The experiment shows that the anti-ammonium shock load process can be divided into two processes: adsorption and release. In the adsorption process, the total removal efficiency of ammonia nitrogen by zeolite and ceramic was 94%. In the release process, the ammonia nitrogen concentration increased significantly and then gradually returned to the normal level four hours after the shock load. The results indicated that the double-layer BAF had a high level of adaptability to the short-term ammonium shock load and long-term operation. The main factors influencing the dynamic process of ammonia nitrogen adsorption were the filter bed height, ammonia nitrogen concentration of influent, and flow rate. The bed depth service time (BDST) model was used to predict the relationship between the filter bed height and breakthrough time at different flow rates, and the results are reliable. 相似文献
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曝气生物滤池反冲洗关键因子的确定及机理浅析 总被引:3,自引:0,他引:3
通过正交试验得出以粒径为3-6mm和堆积密度为.540kg/m3的陶粒为滤料的下向流曝气生物滤池的最佳气水联合反冲洗操作参数:气反冲洗强度(Qa)为4.88L/(s·m2)、水反冲洗强度(Qw)为1.44L/(s·m2)、气预冲洗时间(Ta)为4min、气水同时反冲洗时间(Ts)为5min和单水反冲洗时间(Tw)为3min。其中水反冲洗强度有显著影响,气反冲洗强度、气水同时反冲洗时间有次要影响,气预冲洗时间、水反冲洗时间有较次影响。得到在最佳反冲洗条件下气、水在滤床中所产生速度梯度(G)分别为203.6s-1、130.2s-1。同时,分析了反冲洗后运行时水头损失和污染物去除的变化规律,并从流体力学角度初步探讨了气水联合反冲洗机理。 相似文献
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The effect of hydraulic retention time(HRT) and pH on the biooxidation of ferrous iron during simulated acid mine drainage(AMD)treatment was investigated.The simulated AMD was highly acidic(pH 2.5),rich in iron(about 1700 mg/L) and copper(about 200 mg/L),and contained high concentrations of sulfate(about 4700 mg/L).The biooxidation of ferrous iron was studied in a laboratory-scale upflow packed bed bioreactor(PBR).The HRT was shortened stepwise from 40 h to 20 h,13 h,and 8 h under the acidic environment at a pH value of 2.2.Then,the influent pH value was changed from 2.2 to 1.2 at a constant suitable HRT.Physiochemical and microbial community structure analyses were performed on water samples and stuffing collected from the bioreactor under different conditions.The results indicate that the efficiency of ferrous iron oxidation gradually decreased with the decrease of HRT,and when the HRT exceeded 13 h,ferrous iron in AMD was almost completely oxidized.In addition,the best efficiency of ferrous iron oxidation was achieved at the influent pH value of 1.8.Microbial community structure analyses show that Leptospirillum is the predominant genus attached in the bioreactor,and low influent pH values are suitable for the growth of Leptospirillum. 相似文献
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针对城市内涝及非点源污染问题,从海绵城市建设的角度出发,以银川市金凤区作为研究区域,采用SWMM建立雨洪模型,选取设计雨峰系数为0.4的5种降雨重现期和降雨重现期为0.5 a的4种雨峰系数共9场降雨,评估研究区在下凹式绿地、透水铺装、雨水花园、下凹式绿地组合透水铺装及雨水花园组合透水铺装5种LID方案下对径流及4种污染物的控制效果。模拟结果表明:随着重现期的增大,5种方案的径流控制率及污染物负荷削减率均有所减小;下凹式绿地组合透水铺装方案的削减效果最为显著,重现期为0.5~5 a时,该方案径流控制率均大于65%,污染物负荷削减率均大于45%;重现期为10 a时,径流控制率及TSS、COD、TP与TN负荷削减率分别为61.38%、42.86%、58.23%、44.03%和55.95%;重现期为0.5 a时,随着雨峰系数的增大,5种LID方案的径流控制率及污染物负荷削减率的变化均不明显。LID方案对中小重现期降雨有较好的控制效果,但因组合方案各措施间受到相互作用及不透水面积等因素的影响,并未达到“1+1>2”的叠加效应,最优方案还需深入研究。 相似文献