Abstract
The high costs involved in sewage sludge treatment and disposal in wastewater treatment plants (WWTPs) not only bring about improper sludge disposal and thus environmental pollutions, but also limit the investment on construction of WWTPs, especially in rural areas or low-income regions. This comparative study examined the effect of biogas recirculation coupled with chemical addition in a semi-continuous anaerobic digester for sludge treatment, which was proven to achieve biogas upgrading, phosphorus conservation and sludge conditioning simultaneously, largely reducing the sludge treatment cost. Results show that FeCl3 addition coupling biogas recirculation can improve sludge dewaterability by 94% in comparison to 75% by equivalent MgCl2 addition, and 97% phosphorus in digestate can be conserved in solid with formation of vivianite-like crystals. Biogas recirculation can enhance CH4 yield and content by 13% and 11%, respectively, likely attributable to the increased relative abundances of both hydrogenotrophic Methanomicrobiales and acetoclastic Methanosarcinales.
References
Mar 25, 1999·Environmental Health Perspectives·C WuD L Davis
Feb 6, 2002·Water Research·David C Sobeck, Matthew J Higgins
Jun 12, 2003·Bioresource Technology·Nathan O NelsonDean L Hesterberg
Aug 23, 2005·Water Research·Khursheed KarimM H Al-Dahhan
Apr 2, 2008·Annals of the New York Academy of Sciences·Yuchen Liu, William B Whitman
Feb 4, 2009·Journal of Applied Microbiology·F H LiuZ H Zhou
Apr 4, 2009·Water Science and Technology : a Journal of the International Association on Water Pollution Research·P Cornel, C Schaum
Apr 9, 2013·Bioresource Technology·Sang-Hoon LeeHee-Deung Park
Dec 18, 2013·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Chang Min Park, John T Novak
Mar 13, 2014·Water Research·Haisong LiQi Zhou
Mar 6, 2015·World Journal of Microbiology & Biotechnology·Rakia ChouariAbdelghani Sghir
Apr 29, 2015·Water Research·Guang YangHongchen Wang
May 8, 2015·Environmental Science & Technology·Philipp WilfertMark C M van Loosdrecht
Jun 17, 2016·Bioresource Technology·R Umaiyakunjaram, P Shanmugam
Sep 1, 2016·Water Research·P WilfertM C M Van Loosdrecht
May 2, 2017·The Science of the Total Environment·Deniz AkgulCigdem Eskicioglu
Jul 15, 2017·Bioresource Technology·Yang YuZhenya Zhang
Aug 13, 2017·Chemosphere·Patrick M MeliaRosa Busquets
Sep 15, 2017·Bioresource Technology·Ruo-Hong Li, Xiao-Yan Li
Jul 28, 2018·Water Research·P WilfertM C M Van Loosdrecht
Sep 16, 2018·Water Research·Qiandi WangDongsheng Wang
Nov 6, 2018·Water Research·Si-Jia MaHong-Qiang Ren
Dec 28, 2018·Bioresource Technology·Yafan CaiXiaofen Wang
May 31, 2019·Environment International·Jia-Yuan LuWen-Wei Li
May 26, 2020·The Science of the Total Environment·Stefania MazziniFabrizio Adani