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Journal of Researches in Mechanics of Agricultural Machinery
Effect of Chemical Pre-treatment on Methane Production from Co-Digestion of Cow Manure and Pistachio Wastes


 submission: - | acception: 26/03/2020 | publication: 14/06/2020

DOI 

Authors
Hassan Dorondi1, Rahim Ebrahimi2, MAhmoud Mahmoudi3, Ali Maleki4*

1-،h_dorondi@yahoo.com

2-،rahim.ebrahimi@gmail.com

3-،Mahmoudi@gmail.com

4-،maleki.ali2000@gmail.com



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Abstract

Iran is the highest producer of pistachio worldwide and has an annual production of about ۵۰۰,۰۰۰ tons of fresh pistachio by-product. Due to its high organic and phenolic content as well as high solids concentration, pistachio processing wastes create significant waste management problems unless they are properly managed. Anaerobic digestion is one of the acceptable environmental and economic technologies to control the pistachio wastes and produce energy and enrich fertilizer for soil. Good digestion for different wastes needs suitable mixture for co-substrates and pretreatments. Therefore, effect of different mixture of pistachio waste: cow manure and pretreatment factors of NaOH and H۲O۲ was studied in this research. Co-digestion was done in the ۲۵۰ mL digesters for mesophilic condition using a combined D-optimal design. Their CH۴ production were measured for ۲۴ days. Then a model was developed among the CH۴ production and amounts of pistachio waste, cow manure, NaOH and H۲O۲ to determine the effects of these parameters on the CH۴ production. Model P-value was lower than ۰.۰۰۰۱ and its lack of fit was ۰.۲۷, predicted R۲ was ۰.۵۳ in reasonable agreement with adjusted R۲ of ۰.۶۳. Adequate precision was ۹.۷ indicated an adequate signal for the model. Further, standard error of the model equaled to ۰.۴ which was very low, model R۲ equaled to ۰.۶۹ and adjusted R۲ was ۰.۶۳ which were high, indicating that the model was suitable for CH۴ estimation. By illustrating the model in ۳D graphs, it was shown that the use of NaOH had negative effect on the CH۴ production while H۲O۲ had positive effect on the CH۴ production. Higher amounts of cow manure improved the CH۴ production while higher amounts of pistachio wastes decreased the CH۴ production. These may happen because of the high amounts of phenolic and antioxidant compounds in the pistachio waste which are harmful for anaerobic microbes




Keywords

Chemical Pre treatment  Cow manure  Modeling  Pistachio waste 



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