Enhancement of digestates dewaterability by CTAB combined with CFA pretreatment
Enhancement of digestates dewaterability by CTAB combined with CFA pretreatment
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DOI：
10.1016/j.seppur.2016.01.052
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发表时间：
2016-05
影响因子：
8.6
通讯作者：
Yangqing Zheng;Lanting Ke;D. Xia;Yanmei Zheng;Yuanpeng Wang;Heng Li;Qingbiao Li
中科院分区：
文献类型：
--
作者：
Yangqing Zheng;Lanting Ke;D. Xia;Yanmei Zheng;Yuanpeng Wang;Heng Li;Qingbiao Li
研究了十六烷基三甲基溴化铵（CTAB）和粉煤灰（CFA）预处理膨润土的效果及机理。通过测定不同状态下的含水率和过滤比阻来评价不同状态下的脱水性能。通过对预处理前后蛋白质、多糖含量、Zeta电位和颗粒大小的测定，探讨预处理的机理。结果表明，CTAB和CFA联合调理能有效改善污泥的湿态脱水性能。对于秸秆堆肥、猪粪堆肥、牛粪堆肥和餐厨垃圾堆肥，CTAB的最佳投加量分别为堆肥干固体的50%、30%、20%和50%，CFA的最佳投加量为堆肥干固体的100%。与单独的CTAB或CFA调节相比，CTAB和CFA的共调节导致明显的优势，以降低三态的WC。其机理可能是CTAB和CFA的协同作用。CTAB释放细胞外聚合物（EPS）并中和电荷，CFA在脱水过程中充当骨架构建剂，增强脱水性能。最后，采用化工过程环境评价中的绿色度方法对废水的静态脱水进行评价。
In this study, the effects and mechanism of pretreating digestates with cetyltrimethylammonium bromide (CTAB) and coal fly ash (CFA) were investigated. The water content (WC) and specific resistance of filtration (SRF) of the digestates were measured to evaluate the digestate dewaterability. The protein (PN) content, polysaccharide (PS) content, zeta potential and particle size of the digestates were measured to probe the mechanism of pretreatment. The results indicated that the digestate dewatering performance was effectively improved by joint conditioning with CTAB and CFA. For straw digestate (St-digestate), pig manure digestate (PM-digestate), cow dung digestate (CD-digestate) and kitchen waste digestate (KW-digestate), the optimum dosage of CTAB was 50%, 30%, 20% and 50% dry solid (DS) of digestate, respectively, and the optimum dosage of CFA was 100% DS of digestate. Co-conditioning with CTAB and CFA resulted in clear advantages compared to CTAB or CFA conditioning alone for decreasing the WC of digestates. The proposed mechanism is the synergistic effect of CTAB and CFA. CTAB releases extracellular polymeric substances (EPS) and neutralizes charge, and CFA acts as a skeleton builder in the dewatering process to enhance dewaterability. Finally, a green degree method for the environmental assessment of chemical processes was adopted to evaluate digestate dewatering.