硝化系统碱度特征与调控对策的研究  

Alkalinity characteristics and control strategy in nitrification system.

作　　者：陈旭良[1] 蔡靖[1] 郑平[1] 周尚兴 丁革胜 

机构地区：[1]浙江大学环境工程系,浙江杭州310029 [2]浙江蜜蜂集团,浙江义乌322002

出　　处：《浙江大学学报（农业与生命科学版）》2006年第3期318-322,共5页Journal of Zhejiang University:Agriculture and Life Sciences

基　　金：国家自然科学基金(30070017);浙江省重大科技攻关项目(2003C13005)

摘　　要：味精废水呈酸性，不宜直接进行硝化作用，需要外加中和药剂，在所试验的4种中和药剂中。石灰和NaOH调节废水pH的效果优于Na2CO3和NaHCO3．硝化过程消耗大量碱度。必须及时补充．以NaOH和石灰作为碱度补充物质，投加量较少；但一次性投加后，pH超过硝化细菌适宜的生长和代谢范围；操作上宜采取多次投加或分段投加．以Na2CO3和NaHCO3作为碱度补充物质，投加后pH适宜硝化细菌的生长和代谢，操作上可采取一次性投加．综合考虑硝化过程的碱度、pH以及费用，Na2CO3是最合适的备选中和药剂．若出水中保持50mg·L^-1左右剩余碱度，pH可稳定在7．5～8．0，能满足硝化细菌生长和代谢的要求．出水NH4^＋-N对剩余碱度的直接贡献不大，但间接贡献较大．The monosodium glutamate wastewater is acidic, which is not suitable to be nitrified directly, Therefore, some chemicals need to be added to neutralize it. Among the four tested neutralization chemicals, lime and sodium hydroxide are better to adjust pH than sodium carbonate and sodium bicarbonate, Because of alkalinity consumption in nitrification process, it must be balanced in time. Using lime or sodium hydroxide as the alkalinity-supplied chemicals, the amount needed is relatively small. However, pH value will be beyond the range for nitrobacteria to grow and metabolize if it is added once for all. So it should be added by several times or in several sections, Using sodium carbonate or sodium bicarbonate as the alkalinity-supplied chemical, pH value is within the range for nitrobacteria to grow and metabolize, Therefore it can be added once for all. Taking alkalinity, pH and cost into account, sodium carbonate is the most suitable chemical. As long as the effluent alkalinity keeps about 50 mg·L^-1, pH value will stay between 7,5-8.0, which satisfies the growth and metabolism of nitrobacteria. The effluent NH4^＋ -N contributes to effluent alkalinity indirectly, rather than directly.

关 键 词：硝化系统 碱度特征 调控对策 

分 类 号：X703[环境科学与工程—环境工程]