He Xuejie, He Lei, Lin Ziyuan, Zhou Jiong, Shi Shuohui, Liu Yi, Zhou Jian
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
Sci Total Environ. 2022 Feb 1;806(Pt 4):150899. doi: 10.1016/j.scitotenv.2021.150899. Epub 2021 Oct 14.
To address the problem of difficult disposal caused by poor dewaterability of high-organic sludge in wastewater treatment plant, this study developed a sludge composite conditioner (SCC) consisting of sodium dodecyl sulfate (SDS), HCl and FeCl. It has the potential to significantly improve the dewaterability of the high-organic sludge with the VSS/MLSS of 80%. The moisture content (MC) and bound water content of sludge were reduced from 98.00 to 59.65% and from 3.42 to 0.91 g/g dry sludge (DS) after being conditioned, respectively. The surfactant (SDS) promoted the dissolution of extracellular polymeric substances (EPS). The acid (HCl) enhanced the decomposition of the sludge flocs, making the insoluble EPS peel off and turn into the liquid phase. As a result, total EPS decreased by 52.70% compared to the original sludge. In addition, due to the neutralization effect of protons and FeCl, the Zeta potential increased remarkably from -13.80 mV to -1.72 mV and the dispersed sludge particles formed during EPS dissolution process were re-flocculated, which increased the average size of the sludge particles. The ratio of proteins (PN)/polysaccharides (PS) also increased from 1.69 to 3.81. And a quantitative model of optimum dosage of SCC agents based on the influence of the sludge PS, PN and EPS content has been established, aiming to determine the dosage of each conditioner according to the properties of target sludge. In general, the SCC provided an effective pathway for sludge deep dewatering.
为解决污水处理厂中高有机污泥脱水性能差导致的处置困难问题，本研究开发了一种由十二烷基硫酸钠（SDS）、HCl和FeCl组成的污泥复合调理剂（SCC）。它有潜力显著提高挥发性悬浮固体/混合液悬浮固体（VSS/MLSS）为80%的高有机污泥的脱水性能。调理后，污泥的含水率（MC）和结合水含量分别从98.00%降至59.65%，从3.42 g/g干污泥（DS）降至0.91 g/g干污泥。表面活性剂（SDS）促进了胞外聚合物（EPS）的溶解。酸（HCl）增强了污泥絮体的分解，使不溶性EPS剥离并进入液相。结果，与原始污泥相比，总EPS减少了52.70%。此外，由于质子与FeCl的中和作用，Zeta电位从-13.80 mV显著增加到-1.72 mV，并且在EPS溶解过程中形成的分散污泥颗粒重新絮凝，这增加了污泥颗粒的平均尺寸。蛋白质（PN）/多糖（PS）的比例也从1.69增加到3.81。并且基于污泥PS、PN和EPS含量的影响建立了SCC药剂最佳投加量的定量模型，旨在根据目标污泥的性质确定每种调理剂的投加量。总体而言，SCC为污泥深度脱水提供了一条有效途径。
