工业聚集区污水管道病害多元水质成因研究

Study on Multiple Water Quality Causes of Sewage Pipeline Diseases in Industrial Agglomerations

工业聚集区污染负荷不断加剧,致使区域污水管道服役期限低于市政污水管道。现阶段,工业聚集区污水管道病害成因尚未明晰,缺乏针对性水质情况研究。鉴于此,以H市工业聚集区的典型管道病害点为研究对象,分别针对高污染废水原位病害和多股污废水汇集结晶两种场景,探讨了管道病害发生的多元水质成因。结果表明,结晶倾向离子SO_(4)^(2-)和Ca^(2+)含量高是管道检查井和中途泵站原位堵塞出现的主要原因;沉积物淤积点病害程度尚不严重,但流经污废水中DOC含量较高,要求管道及时清淤以防发生严重畅通性问题;此外,单一化工厂排放的污废水并未直接导致管道堵塞,只有在3种化工厂污废水交汇管段才发生反复结晶病害,且堵塞程度呈现加重趋势,管道结垢物的X射线衍射(XRD)图谱与CaSO_(4)·2H_(2)O高度重合。综上可知,降低水质风险指标含量以及合理布置污染企业结构是控制工业聚集区污水管道病害的有效策略。

Pollution burdens in industrial agglomerations have continuously increased,causing the service life of regional sewage pipelines to be lower than that of municipal sewage pipelines.Currently,the causes of sewage pipe diseases in industrial agglomerations are not clarified,lacking of studies on water quality.Thus,typical pipe disease sites in the industrial agglomeration area of H city were taken as objects.Multifaceted water quality causes were explored for two scenarios,i.e.,in-situ disease for polluted sewage and crystalline for multi-strand sewage intersecting,respectively to discuss the cause of multi source water qulity.The results showed that high concentrations of crystallization tendency ions SO_(4)^(2-)and Ca^(2+)were the main reasons for in-situ clogging occurrence in manhole and midway pumping stations;Sediment siltation sites were not severely diseased,while the higher DOC content required pipe should be desilted timely to prevent serious accessibility;Sewage discharged from a single chemical plant didn't cause direct clogging.But only at the intersection of three kinds of chemical sewage pipe sections,occurred repeated crystallization and with clogging degree showed aggravating trends.Then,the pipeline fouling material diffraction pattern was highly coincident with CaSO4·2H0.Briefly,reducing water quality risky indicators and rationally arranging enterprise structure are effective strategies for controlling pipe diseases in industrial agglomerations.