摘 要：煤气化废水中不仅存在CO32－、HCO3－、HS－等阴离子，还存在Cl－、SO42－等阴离子，因此废水中既存在游离铵盐也存在固定铵盐。仅采用煤气化废水处理中的双侧线汽提技术无法除去固定氨，导致处理后废水的氨的质量浓度严重超标，影响后续生化处理。为了降低废水中固定氨的质量浓度，在双侧线汽提塔内采用加碱脱氨技术，并借助流程模拟，对加碱位置和加碱量进行优化。结果表明，在塔釜总氨及总酸的质量浓度满足出水要求的前提下，加碱后双侧线汽提塔固定氨的脱除率达99.8％。改善废水水质的同时回收了大量氨，具有较好的社会和经济效益。
关键词：煤气化废水处理；双侧线汽提塔；加碱脱氨；固定氨
中图分类号：TQ028 文献标识码：A 文章编号：0253-4320（2012）11-0088-03
Alkali-iniection deammoniation of double side-draw stripper in coal-gasification wastewater treatment
CHEN Yun，ZHOU Wei，LI Xiu-xi，QIAN Yu
（School of Cheinistry and Chemical Engineering，South China University of Technology，Guangzhou 510640，China）
Abstract：There are the anions including not only CO32－，HCO3－，HS－，etc.，but also Cl－，SO42－，etc in coal-gasification wastewater，which suggests the existence of both free ammonia and fixed ammonia in the wastewater. Therefore，only using the double side-draw stripping technology in coal-gasification wastewater treatment can not remove the fixed ammonia and consequently make the mass concentration of ammonia in the treated wastewa....
