Abstract
Organic household waste has a high organic content (69 g/kg), value of pH equal to 6,3 with 94% of moisture. Anaerobic digestion is one of the technologies for recycling and stabilization of organic waste, the process is carried out in 3L reactor at semi continuous and mesophelic conditions. During the anaerobic digestion of OHW, pH was around neutrality (between 6,5 and 8), a decrease of alkalinity was observed reaching a value of 900 mg CaCo3/L), total and volatile solid were accumulated at the end of the experiment. Result of biogas production indicates that a higher methane yield was obtained for the load 0,5 g VS/L, methanogenic potential for the anaerobic digestion of OHW was 0,15LSTP/g VS.
Highlights
In recent decades, rapid urbanization of cities has led to a proliferation of uncontrolled landfills (El Khamlichi, 1997)
The experiment was conducted in laboratory glass bottles of 3L volume, which served as semi continuous mode anaerobic reactor working under mesophilic temperature, it was equipped with two connections to load substrate and ventilate methane gas and magnetically stirred by means of an electromagnetic stirrer connected to a motor
The maximum of methane yield was observed for the load 0,5 g VS/L and reached of 0,15 L/g VS, this value is in line with that found by Gao et al (2015) who trated residual kitchen waste by anaerobic digestion and a value of 0,479 L/g TS was obtained in this study
Summary
Rapid urbanization of cities has led to a proliferation of uncontrolled landfills (El Khamlichi, 1997). The production of household waste in urban areas is about 11 000 tonnes/day These waste consists mainly of organic material (50 to 70%), paper-cardboard (5 to 10%) of plastic (6 to 8%) of metal (1 to 4%) and glass (1-2%) (Ajir, 2002). The treatment of household waste, especially, remains very underdeveloped outside the wild landfill that has a harmful effect on the environment (soil pollution, water resources and greenhouse gas emissions). Alternative processing technologies, such as Anaerobic Digestion (AD), offer some potential for the recovery of valuable resources and the reduction of organic compounds from organic wastes by producing biogas (Carvalheiro et al, 2008; Stabnikova et al, 2008). Anaerobic digestion has been considered as a promising process for organic waste removal coupled with renewable energy generation (Scano et al, 2014; Yangin-Gomec and Ozturk, 2013)
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