Optimization of NaOH thermo-chemical pre-treatment for enhancing solubilisation of rice straw by Response Surface Methodology

Seyed Mohammad Hosseini (1) , Hamidi Abdul Aziz (1) , C. Syafalni (1) , Meisam Valizadeh Kiamahalleh (2)

1 Department of Environmental Engineering
2 Department of Chemical Engineering

A municipal solid waste produced in urban and rural communities is a serious pollution source of water resource in developing country. One of the main problem in treatment of organic solid waste is its non-readily biodegradability due to the complexity of organic material especially hemicellolluse. This study reports Sodium Hydroxide (NaOH) thermochemical pretreatment of rice straw as a indicators of cellulosic compound to enhance its biodegradability. Laboratory-scale experiments were carried out in completely mixed reactors, 500 ml capacity. In order to optimization of hydrolysis of rice straw, Response Surface Method (RSM) based on three factors and one response design was performed to optimize experimental conditions. The effects of reaction parameters including sodium hydroxide concentration (0-30 g/l), reaction time (10-180 min) and temperature (30-200 oC) were evaluated. The optimum conditions resulted by RSM were: NaOH concentration 29.9 g/l, reaction time 133.1 min. and temperature 157.6 oC. The actual experimental soluble chemical oxygen demand (SCOD) of rice straw soluble was 41200 mg/l under optimum condition, which compared well to the maximum predicted value of 41211 mg/l.

Mots clés: Rice straw; thermochemical pretreatment; Response Surface Method; water resource; pollution

Domaines: Environnement et Société

Seyed Mohammad Hosseini, Hamidi Abdul Aziz, C. Syafalni, Meisam Valizadeh Kiamahalleh. Optimization of NaOH thermo-chemical pre-treatment for enhancing solubilisation of rice straw by Response Surface Methodology. 11th edition of the World Wide Workshop for Young Environmental Scientists (WWW-YES-2011) - Urban Waters: resource or risks?, Jun 2011, Arcueil, France. ⟨hal-00607962⟩