Improving dewaterability of anaerobically digested sludge by combination of persulfate and zero valent iron
Improving dewaterability of anaerobically digested sludge by combination of persulfate and zero valent iron
复制标题
DOI：
10.1016/j.cej.2016.03.064
复制
发表时间：
2016-07
影响因子：
15.1
通讯作者：
Kang Song;Xu Zhou;Yiqi Liu;Guo-Jun Xie;Dong-bo Wang;Tingting Zhang;Chunshuang Liu;Peng Liu
中科院分区：
文献类型：
--
作者：
Kang Song;Xu Zhou;Yiqi Liu;Guo-Jun Xie;Dong-bo Wang;Tingting Zhang;Chunshuang Liu;Peng Liu
废水生物处理过程会产生大量污泥，污泥的处理和处置成本高昂。提高污泥脱水性能对降低污水处理厂污泥处置成本具有重要意义。本研究提出了一种创新的调理方法，以提高脱水的厌氧消化污泥（ADS）收集从一个完整的规模污水处理厂的第一次。过硫酸盐的存在显著提高了ADS的脱水性能（0-1.0 g/g TS; TS：总固体）和零价铁（ZVI）在2.0 g ZVI/g TS和0.5 g过硫酸盐/g TS下获得ADS脱水性的最大改善，在此条件下，毛细抽吸时间（污泥脱水性的指标）减少约90%。与传统的芬顿法（Fe 2 ++ H2 O2，pH 2.0）相比，ZVI-过硫酸盐调理法在提高ADS脱水性能方面具有更大的经济效益。
Biological wastewater treatment process generates large amounts of sludge, the treatment and disposal of which incur substantial costs. Enhancement of sludge dewaterability is of great importance for decreasing the sludge disposal cost in a wastewater treatment plant (WWTP). This study proposes an innovative conditioning approach to improve the dewaterability of the anaerobically digested sludge (ADS) collected from a full-scale WWTP for the first time. The ADS dewaterability was significantly improved in the presence of persulfate (0–1.0 g/g TS; TS: total solids) and zero valent iron (ZVI) (0–4.0 g/g TS) at neutral pH. The largest improvement of ADS dewaterability was obtained at 2.0 g ZVI/g TS and 0.5 g persulfate/g TS, under which the capillary suction time (an indicator of sludge dewaterability) was decreased by approximately 90%. Compared with the traditional Fenton process (Fe2++ H2O2at pH 2.0), economic analysis indicated that the ZVI–persulfate conditioning process is more economically attractive for enhancing ADS dewaterability.