活性污泥中细微沙浓度的预测模型

发布时间：2018-03-21 00:39

本文选题：活性污泥　切入点：MLVSS/MLSS　出处：《环境工程学报》2016年12期 　论文类型：期刊论文

【摘要】：悬浮在污泥混合液中的细微沙会导致活性污泥混合液挥发性悬浮固体与混合液悬浮固体比值(ratio of mixed liquor volatile suspended solids to mixed liquor suspended solids,MLVSS/MLSS)降低。通过向生化池进水中连续投加体积平均粒径分别为14、33、50、66和107μm的石英砂,研究不同粒径细微沙对活性污泥MLVSS/MLSS的影响,探讨不同粒径细微沙的悬浮特性,构建活性污泥中细微沙浓度的预测模型,以为污水厂运行调控提供理论基础。研究结果表明,细微沙粒径越小,悬浮比(悬浮在污泥混合液中的细微沙占生化池进水中细微沙总量的比例)越大,悬浮比与细微沙粒径呈显著的相关关系。通过预测模型得到的细微沙浓度的预测值与实测值差异较小,说明构建的活性污泥中细微沙浓度的预测模型是合理的。污水厂可在维持活性污泥MLVSS稳定的条件下,结合活性污泥中细微沙的浓度,调控污泥MLSS,保证污水处理系统的稳定运行。
[Abstract]:The fine sand suspended in the sludge mixture resulted in a decrease in the ratio of mixed liquor volatile suspended solids to mixed liquor suspended solid SS / MLSSs to the ratio of the volatile suspended solids to the suspended solids of the activated sludge mixture. The volume ratio of MLSS / MLSSs was continuously added to the influent of the biochemical tank. The average particle size of quartz sand is 14 ~ 33o ~ 50 ~ 66 渭 m and 107 渭 m, respectively. The effect of fine sand with different particle size on MLVSS/MLSS of activated sludge was studied, the suspension characteristics of fine sand with different particle size were discussed, and the prediction model of fine sediment concentration in activated sludge was established, which provided the theoretical basis for the operation and regulation of sewage plant. The smaller the particle size of fine sand, the larger the suspended ratio (the proportion of fine sediment suspended in sludge mixture to the total amount of fine sediment in the inlet water of biochemical pond), There is a significant correlation between the suspended ratio and the particle size of fine sand, and the difference between the predicted value and the measured value of the fine sediment concentration obtained by the prediction model is small. It is concluded that the prediction model of fine sediment concentration in activated sludge is reasonable. Under the condition of maintaining the stability of activated sludge MLVSS and combining the concentration of fine sand in activated sludge, the sludge MLSs can be regulated to ensure the stable operation of sewage treatment system.
【作者单位】：重庆大学三峡库区生态环境教育部重点实验室;重庆大学低碳绿色建筑国际联合研究中心;广东粤港供水有限公司;
【基金】：国家水体污染控制与治理科技重大专项(2013ZX07314-001-002) 高等学校学科创新引智计划项目(B13041)
【分类号】：X703

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