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
出处
《应用与环境生物学报》
CAS
CSCD
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)~~
