苗晓亮

【摘 要】石化廢水中含油，COD和NH3-N浓度较高，废水组分多样、部分有毒性，属于难处理的废水。本文通过对某石化废水生化处理氧化沟改造工程，重点阐述了高效低氧生化工艺的原理和特点，并与改造前的传统生化处理工艺氧化沟进行了对比性分析。该工艺可高效的去除COD，控制溶解氧浓度，维持低氧生化池内溶解氧的低水平，通过同步硝化反硝化实现高效脱氮。该工艺简单，耐冲击能力强，运行管理容易，水下设备少，且主要设备均能实现不停车维护更换。

【关键词】石化废水；高效低氧生化工艺；微孔曝气软管

中图分类号： X742 文献标识码： A 文章编号： 2095-2457（2018）09-0001-003

DOI：10.19694/j.cnki.issn2095-2457.2018.09.001

Application of a New Type of High-efficiency and Low-oxygen Biochemical Process in Petrochemical Wastewater Treatment

MIAO Xiao-liang

（Shanghai Lanke Petrochemical Environmental Technology Co.， Ltd.， Shanghai 201204， China）

【Abstract】Petrochemical wastewater contains relatively high concentrations of oil， COD and NH3-N. The components of the wastewater are diverse and partially toxic. It is difficult to treat. In this paper， the reformation project of the oxidation ditch of biochemical treatment of a petrochemical wastewater is described. The principle and characteristics of the high-efficiency and low-oxygen biochemical process are mainly described， and the oxidation oxidation ditch of the traditional biochemical treatment process before the transformation is compared and analyzed. The process can efficiently remove COD， control the dissolved oxygen concentration， maintain the low level of dissolved oxygen in the low-oxygen biochemical pool， and achieve high-efficiency denitrification by simultaneous nitrification and denitrification. The process is simple， strong impact resistance， easy operation and management， less underwater equipment， and the main equipment can achieve maintenance and replacement without stopping.

【Key words】Petrochemical wastewater；High efficiency and low oxygen biochemical process；Microporous aeration hose上海某石化公司是从事炼油和化工的综合性公司。其主要产品有汽油、柴油、乙烯、丙烯、聚乙烯、腈纶等60多种产品，除了石油化工产品，还有合成树脂和合成纤维。[1]

公司2#污水处理单元处理水量是5.0万吨/日。主要处理对象有生产车间排放的含丙烯腈、氰化钠、酸性水、油脂、PTA高浓度废水、高硫高氨废水、腈纶废水等。该废水特点是：含油，COD和NH3-N浓度较高，废水组分多样、有毒性。其中丙烯腈、氰化钠对污水处理微生物的限制及致死作用，给生化处理带来难度。

目前，污水处理工艺是由生产车间进行预处理，达到一定要求后，然后由环保水务部排到污水处理厂，处理后的达标污水排放，工艺如图1。目前主要存在的问题是二级生化处理装置的氧化沟是机械表面曝气的三槽式氧化沟，现为敞开式结构，池内臭味散发状况较为严重，无法满足上海市地区和石化行业排放标准；……