DISTRIBUTION LAW AND INFLUENCING FACTORS OF SLUDGE YIELD OF WASTE PURIFICATION PLANTS IN L DISTRICT, SHENZHEN
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摘要: 调研了深圳市L区12座水质净化厂2016-2020年的污泥产率。结果表明:污泥产率(以绝干污泥计)的区间为0.51~2.66 t/万m3,5年污泥产率的平均值呈逐年上升趋势。大多数情况下,对污水处理工艺进行"提标改造"可降低污泥产率。进水SS和BOD5与污泥产率呈正相关。出厂污泥含水率影响污泥处理时的药剂投加量,进而影响污泥产率。料仓储存条件会改变出厂污泥的质量,从而影响污泥产率。降低污泥产率可以从优化污水处理系统、提高进水可生化性、减少药剂投加量以及改善料仓储存条件入手,建议采用旁路进水或多点曝气,控制进水中悬浮固体的含量,强化预处理阶段泥沙分离,优化污泥处理时的药剂投加量,以及使用封闭料仓储存及密闭污泥运输等污泥原位减量的措施。Abstract: The sludge yield of 12 water purification plants in L District of Shenzhen from 2016 to 2020 was investigated. The results showed that the sludge yield ranged from 0.51 to 2.66 t DS/104 m3, and its average value showed an increasing trend. In most cases, upgrading the wastewater treatment process can reduce sludge yield. Influent SS and BOD5 were positively correlated with sludge yield. The outward sludge moisture affected the sludge yield by influencing the dosage of chemicals in sludge treatment. Silo storage condition could change the weight of sludge and thus affect the sludge yield. In order to reduce the sludge yield, optimizing the wastewater treatment system, improving the influent biodegradability, reducing the dosage of chemicals and improving the silo storage conditions should be considered. It is suggested to use specific in-situ sludge reduction measures including using bypass inlet or multi-point aeration, controlling inflow suspended solids, strengthening sediment separation in the pretreatment stage, and adopting closed silos and transportation modes.
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