Effects of different pre-treatment methods on anaerobic mixed microflora for hydrogen production and COD reduction from domestic effluent

Conference on Innovation in Technology and Engineering Science

工业技术（总论）

Primasari, B.^1 ; Tamin, M.Z.A.^2 ; Mustafa, M.A.H.^2

Department of Environmental Engineering, Faculty of Engineering, Universitas Andalas, Padang

25163, Indonesia^1

Department of Civil and Environmental Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur

50603, Malaysia^2

关键词: Activated sludge reactors;    Chloroform treatment;    COD removal efficiency;    Control experiments;    Domestic effluents;    Pretreatment methods;    Production enhancement;    Sludge pretreatment;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/602/1/012061/pdf
DOI  :  10.1088/1757-899X/602/1/012061

学科分类：工业工程学

来源: IOP

【 摘 要 】

Effects of different pretreatment methods on sludge inoculum were evaluated concerning hydrogen (H2) production enhancement and COD (chemical oxygen demand) reduction, using domestic effluent in a batch system. The sludge was taken from a recycled line of the activated sludge reactor. Two types of pretreatment were investigated, heat treatment and chloroform treatment. The experiment was conducted at pH 4-6 and inoculum sizes of microbes were 10%, 20%, and 30% respectively; and experiment without sludge pretreatment was also conducted as control. The result showed that 30% COD reduction was achieved for chloroform pretreatment at pH 3 and 10% inoculum size. For heat treatment, a maximum COD removal of 60% was achieved in the experiment at pH 6 and 10% inoculum size. In chloroform pretreatment, a maximum volume of gas evolved was 3.6 mL, at pH 3 and 20% inoculum size. For heat pretreatment, maximum biogas evolved was 2.1 mL, at pH 3 and 10% inoculum size. The experimental results showed that the pretreatment methods (heat treatment and chloroform treatment) at 35 °C and initial pH 5.5 had a positive influence on H2 production yield and COD removal efficiency during the fermentative H2 production as compared to the control experiments (without pretreatment). Heat treatment method was shown to be a simple and useful method for enhancing both H2 producing and COD removal processes from domestic effluent with highest H2 yield and COD removal efficiency at 0.314 mmol H2/g COD and 86%, respectively.