絮凝法处理煤炭地下气化废水试验研究

摘要

为解决气化污水在向气化炉回注过程中油及灰尘对管道的堵塞和腐蚀问题,利用河北大城煤炭地下气化冷凝水进行絮凝试验研究.以聚合氯化铝(PAC)和聚丙烯酰胺(PAM)作为絮凝剂和助凝剂,研究了不同pH值及在相应pH值下加入100mg/L的PAC后污水Zeta电位的变化规律.研究结果表明:絮凝剂PAC使用的最佳pH值在7左右;对比不同PAC和PAM的投加量,研究其除尘除油的能力,当絮凝剂的投加量为100mg/L.助凝剂的投加量为3mg/L时,废水中的含油量由2060mg/L降至1174mg/L,除油率达43%,含尘量由600mg/L降至96mg/L,除尘率达84%,此时PAC和PAM为最佳用量组合.%Aiming at the pipeline blockage and corrosion caused by oil and dust in gasification wastewater reinjection to gasifier,the flocculation test was carried out on coal gasification condensate water from Hebei Dacheng.PAC and PAM were used as flocculant and coagulant separately.According to the comparison of the Zeta potential change law in different pH value after 100 mg/L PAC added,the optimum pH for PAC flocculant is about 7.The ability of PAC and PAM for oil and dust removal was studied under different concentrations.When the concentration of PAC is 100 mg/L and that of PAM is 3 mg/L,the oil content in wastewater decreased from 2060 mg/L to 1174 mg/L,the oil removal rate reached 43%,and the dust content in wastewater decreased from 600 mg/L to 96 mg/L,the dust removal rate reached 84%;this is the optimum composition of PAM and PAC.