摘 要：煤氣化廢水中不僅存在CO32－、HCO3－、HS－等陰離子，還存在Cl－、SO42－等陰離子，因此廢水中既存在游離銨鹽也存在固定銨鹽。僅采用煤氣化廢水處理中的雙側線汽提技術無法除去固定氨，導致處理后廢水的氨的質量濃度嚴重超標，影響后續(xù)生化處理。為了降低廢水中固定氨的質量濃度，在雙側線汽提塔內采用加堿脫氨技術，并借助流程模擬，對加堿位置和加堿量進行優(yōu)化。結果表明，在塔釜總氨及總酸的質量濃度滿足出水要求的前提下，加堿后雙側線汽提塔固定氨的脫除率達99.8％。改善廢水水質的同時回收了大量氨，具有較好的社會和經濟效益。
關鍵詞：煤氣化廢水處理；雙側線汽提塔；加堿脫氨；固定氨
中圖分類號：TQ028 文獻標識碼：A 文章編號：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....
