作者/來源:陳 赟,周 偉,李秀喜,錢 宇(華南理工大學(xué)化學(xué)與化工學(xué)院,廣東 廣州 510640) 日期: 2013-07-15 點(diǎn)擊率:2033
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(cè)線汽提技術(shù)無法除去固定氨,導(dǎo)致處理后廢水的氨的質(zhì)量濃度嚴(yán)重超標(biāo),影響后續(xù)生化處理。為了降低廢水中固定氨的質(zhì)量濃度,在雙側(cè)線汽提塔內(nèi)采用加堿脫氨技術(shù),并借助流程模擬,對加堿位置和加堿量進(jìn)行優(yōu)化。結(jié)果表明,在塔釜總氨及總酸的質(zhì)量濃度滿足出水要求的前提下,加堿后雙側(cè)線汽提塔固定氨的脫除率達(dá)99.8%。改善廢水水質(zhì)的同時回收了大量氨,具有較好的社會和經(jīng)濟(jì)效益。
關(guān)鍵詞:煤氣化廢水處理;雙側(cè)線汽提塔;加堿脫氨;固定氨
中圖分類號:TQ028 文獻(xiàn)標(biāo)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....