玉米秸秆生物炭改善污泥脱水性能  

Preparation of corn stalks biochar and improvement of dewatering performance of sludge

作　　者：郭俊元[1] 文小英 羊润锦 林越 赖雨隆 周育玉 杨红 GUO Jun-yuan;WEN Xiao-ying;YANG Run-jin;LIN Yue;LAI Yu-long;ZHOU Yu-yu;YANG Hong(College of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学资源环境学院

出　　处：《中国环境科学》2019年第8期3316-3322,共7页China Environmental Science

基　　金：国家自然科学基金资助项目(51508043)

摘　　要：本实验以玉米秸秆为原料,制备了生物炭和AlCl3改性生物炭,研究了2种生物炭分别调理污泥后的脱水效果,并探讨了污泥脱水性能的改善机理.结果表明,经过2种生物炭调理后,污泥比阻(SRF)、泥饼含水率(MC)、污泥沉降体积指数(SV30)、毛细抽吸时间(CST)均下降,污泥净产率(YN)升高,说明污泥脱水性能得到了改善,且AlCl3改性生物炭对污泥脱水性能的改善效果明显优于生物炭.当AlCl3(溶液浓度3mol/L)改性生物炭的用量为3g/L时,调理后的污泥SRF,MC,SV30,CST分别降低至1.3×10^12m/kg,81.9%,78.6%,35s,YN增加至17.8kg/(m^2·h).分析原因:一方面,经过生物炭调理后,泥饼中会形成一定的骨架结构,使得污泥中的水和EPS能够更容易地释放;另一方面,经过AlCl3改性后,改性生物炭携带的正电荷(Al3+)能够与污泥颗粒所带的负电荷发生电中和作用,使得污泥颗粒更容易聚集,从而提高污泥的脱水效果.Biochar and AlCl3-modified biochar were prepared by using corn stalks as materials to enhance the dewatering of the sludge.The performances of these two biochar for the enhancement of the dewatering of the sludge and possible enhancing mechanisms were discussed.Results showed that SRF,MC,SV30 and CST of the sludge were decreased and YN was increased after conditioned by the two biochar,indicating higher sludge dewaterability.Furthermore,dewatering of the sludge conditioned by the AlCl3-modified biochar was significantly better than that conditioned by the biochar that without modification.Especially,when the dosage of the biochar modified by 3mol/L of AlCl3 solution was adjusted to 3g/L,SRF,MC,SV30 and CST were decreased to 1.3×10^12m/kg,81.9%,78.6%and 35s,respectively,YN was increased to 17.8kg/(m^2·h).For the enhancing mechanism,on the one hand,after conditioned by the biochar,certain skeleton structures were formed in sludge cake to make water cut across easily by decreasing the sludge EPS;on the other hand,charge neutralization occurred when the AlCl3-modified biochar(loaded with positively charged aluminum species on its surface)was dosed into the sludge system,thus destroying the stable sludge colloidal system,thus far easier to congregate the sludge particles,which enhanced the dewatering of the sludge.

关 键 词：ALCL3 玉米秸秆 生物炭 污泥脱水 

分 类 号：X703.1[环境科学与工程—环境工程]