以pH作为SBR法硝化过程模糊控制参数的基础研究  

USE OF pH AS FUZZY CONTROL PARAMETER FOR NITRIFICATION IN SBR PROCESS

作　　者：高景峰[1] 彭永臻[1] 王淑莹[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100022

出　　处：《应用与环境生物学报》2003年第5期549-553,共5页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金重点项目 (No .50 1 380 1 0 );北京市自然科学基金项目 (No .80 0 2 0 0 5)~~

摘　　要：为实现SBR法处理啤酒废水硝化时间的在线模糊控制 ,系统地研究了不同碱度类型和浓度对SBR法硝化过程中pH变化规律的影响 ,同时考察了DO和ORP的变化规律 .结果表明 ,硝化过程中pH的变化可以分为下降型和上升型 .下降型有 ρ(HCO-3 )适量和不足两种情况 .ρ(HCO-3 )适量时 ,pH在硝化结束时由下降转为上升 ;ρ(HCO-3 )不足时 ,pH在硝化结束时下降速率变小 ;根据 pH这些变化特征控制硝化终点 ;下降型是最普遍的情形 .上升型是 ρ(HCO-3 )过分充足的情况 ,在硝化过程和硝化结束之间 ,pH一直呈现上升趋势 ,不能根据pH的变化来控制硝化时间 ,若 φ(曝气量 )适宜 ,可以通过DO来判断硝化终点 ;上升型在实际中很少出现 .pH以上变化规律不仅可以判断硝化时间 ,还可以判断硝化反应过程中 ρ(HCO-3 )充足与否 .在此基础上 ,建立了SBR法硝化时间的模糊控制规则 .图 7表 1参In order to achieve fuzzy control of nitrification in Sequencing Batch Reactor (SBR), brewery wastewater was used as the substrate. The effect of alkalinity on pH variation during nitrification was systematically studied, at the same time the variations of DO and ORP were investigated. According to the results, variation of pH could be divided into rising type and descending type. When ρ(HCO- 3) was deficient or sufficient, descending type happened. If ρ(HCO- 3) was deficient, the pH decreasing rate got slower when nitrification nearly stopped; if ρ(HCO- 3) was sufficient, at the end of nitrification pH turned from decrease to increase. This was the most common situation and pH could be used to control the end of nitrification. When ρ(HCO- 3) was excessive, rising type happened, pH was increasing at nearly a constant rate during and after nitrification and could not be used to control the nitrification time, but if the φ(aeration rate) was moderate DO could be used to control the nitrification time. This situation seldom happened. Therefore, the variation of pH could not only be used to control the nitrification time but also to judge whether ρ(HCO- 3) was enough or not. On the basis of this, the fuzzy controller of nitrification in SBR was constructed. Fig 7, Tab 1, Ref 16

关 键 词：PH SBR法 硝化 模糊控制 碱度 废水处理 

分 类 号：X703[环境科学与工程—环境工程]