Kinetics Modeling of Anaerobic Digestion at Waste Activated Sludge with Chemical Pretreatment

• Main Authors: Shou-Chung Chang, 張守中
• Other Authors: Jih-Gaw Lin
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/17630014838137018018

碩士 === 國立交通大學 === 環境工程研究所 === 82 === The relative research about the use of waste activated sludge (WAS) as the substrate for anaerobic digestion had widely studied in past few decades.The main purpose of this study is to see the effect of chemical pretreatment on anaerobic digestion. The system adapted in this study is to set four semicontinuous anaerobic digestion reactors,in which one is the control set, ,and the other three are the refrential sets.The control set was fed with WAS without chemical pretreatment,and the three referential sets were fed with WAS pretreated by different concentrations of NaOH.During the four different hydraulitic retention time (HRT=20 days ,13.3 days,10 days,and 7.5 days),we found that the removal of the substrate,the gas production rate,the methane production per unit substrate removal,and the proportion of methane in the gas composition will increase. From the kinetics model we can get the decay coefficient of methanogenesis,the yield coefficient of methanogenesis ,the decay coefficient of acidogenesis ,and the yield coefficient of acidogenesis.The range of the hydrolysis rate can also be computed,which indicated the increase of the hydrolysis rate by chemical pretreatment. When our experiment processed for 7.5 days of hydraulitic retention time,the state of these four reactors still kept normal and stable under anaerobic digestion.And the experimental result indicated that anaerobic digestion with chemical pretreatment was able to increase the effect of substrate removal and the rate of the anaerobic digestion.