污水厂异常进水对溶解氧影响特征经验总结

2018-02-03 13:01:30房立海柴树欣
环境与发展 2018年1期

房立海+柴树欣

摘要:总结了突发性异常进水(油、重金属和高浓进水)对生物曝气池DO的影响特征。含油进水DO示数偏低,曝气池前端较后端明显;重金属进水,曝气池前端DO偏高,后端DO偏低;高浓进水,曝气池DO整体偏低。利用DO变化特征并结合进水COD在线检测值可以对进水类型进行快速的初步判断,以便采取相应的应急处置措施。

关键词:市政污水处理厂;异常进水;溶解氧;调控措施

中图分类号:X703 文献标识码:A 文章编号:2095-672X(2018)01-0123-01

DOI:10.16647/j.cnki.cn15-1369/X.2018.01.070

Experience summary of the influence of abnormal inflow on dissolved oxygen in wastewater treatment plant

Fang Lihai,Chai Shuxin

(Everbright Water(ji?nan)Limited,Jinan Shandong 250032, China)

Abstract:The influence characteristics of abnormal inflow on DO in biological aeration tank is summarized, such as oil, heavy metal and high concentration influent. In the case of oil, DO is lower, and the front of the aeration tank is more obvious than that of the laterstage; In the case of heavy metal,DO is higher in the front and lower in the later stage; In the case of high concentration influent, DO is lower overall. By using the DO variation characteristics and combined with the influent COD online detection values, the preliminary judgment of the type of the water can be carried out quickly, so as to take the corresponding emergency treatment measures.

Keywords:Municipal wastewater treatment plant;Abnormal inflow; Dissolved oxygen;Influence countermeasure

市政污水處理厂进水通常以生活污水为主,进水水质较为稳定、生化性好,易于处理,但是偶有进水异常情况发生,如高浓进水、油、重金属等,以处理生活污水为主的市政污水厂一般没有设计专门的应对设施,会对稳定达标运行构成一定威胁。目前关于工业废水处理的研究较多[1-4],而关于市政污水厂突发性异常进水的研究较少[5]。本文以常见的渗滤液、油、重金属进水为例,对山东省某市政污水厂突发性异常进水对DO的影响特征进行了经验总结,为异常进水的及时发现和甄别提供参考,以便采取应对措施。

1 异常进水影响特征

1.1 含油进水

本厂采用推流式A/A/O工艺,好氧区停留时间为8h,沿程均匀取8个点位检测DO含量。在进水含油情况下(170mg/L),DO较正常值偏低,好氧区前段较为明显,这种差异在好氧区后段逐渐减弱,如图1所示。

图1 异常进水对DO的影响

根据出水在线检测结果,COD和NH3-N浓度略有升高,这说明活性污泥受油的影响COD和NH3-N的降解速率降低,此时耗氧量降低,应当表现出DO升高的现象,这与DO的检测结果相反。……

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