泥区废液回流对污水处理系统出水水质特性的影响
Effect of waste liquid from sludge treatment area on water quality of effluent of sewage treatment systems
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摘要: 研究了泥区废液回流对污水处理系统出水水质特性的影响，为污水再生与安全回用提供参考。通过模拟泥区废液回流SBR污水处理系统，分别对不同回流比出水的COD、UV254、表观分子量分布以及三维荧光光谱特性进行检测分析。研究显示：虽然泥区废液回流污水处理系统一般不会引起处理系统出水COD的显著变化，但出水残留有机物的芳香性和不饱和度增强，大分子物质和腐殖质类污染物所占比例增加，致使出水水质呈现复杂化趋势。因此，泥区废液回流不利于污水的资源化和安全健康回用。Abstract: The influence on the characteristic of leftover organic compounds in the effluent was researched when mixed with the waste liquid from sludge treatment area in the influent of sewage treatment systems. It aimed to provide reference for wastewater reclamation and security reuse. By simulating the process that the waste liquid from sludge treatment area was reflowed to sequencing batch reactor (SBR) treatment system， some water quality parameters of effluent， such as COD， UV254， the distribution of molecular weight and the three-dimensional fluorescence spectrum were analyzed under the different reflux ratios. The results show that the aromaticity and unsaturation of the leftover organic compounds in the effluent were enhanced， and the proportions of the larger molecular weight organic compounds and the humus in the effluent markedly increased with an increase of reflux ratios of the waste liquid， though the COD in the effluents did not change dramatically. It resulted in complicated tendency of the effluent water quality. Consequently， it is a disadvantage to the wastewater reclaimed and health and security reuse when waste liquid from sludge treatment area was reflowed to the influent of sewage treatment systems.
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