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Coupled green pretreatment of petha wastewater and rice straw

Profile image of Dr. Dolly KumariDr. Dolly Kumari

2020, Environmental and Sustainability Indicators

https://doi.org/10.1016/J.INDIC.2019.100013
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Abstract

The present study describes a novel method in which petha wastewater (PWW) and rice straw (RS) were pretreated symbiotically to improve the quality of both wastes. This pretreatment helped in lignocellulosic degradation of RS, which can easily undergo anaerobic digestion (AD) for biofuel production. pH and alkalinity of PWW was reduced within limits after pretreatment and amount of soluble sugars of RS also increased significantly. Hence we can kill two birds with one stone i.e. solve disposal problem of highly alkaline PWW and RS simultaneously. Saccharification of RS took place which can then be easily biodegradable anaerobically. Percent increase in cellulose was 9.62% whereas percent decrease in hemicellulose and lignin were 7.23% and 8.88% respectively with respect to untreated RS. pH of PWW was reduced from 12 to 6.4 and calcium carbonate alkalinity was completely reduced to null value from initial value of 2400 mg/L. Structural changes like roughness and porosity are shown in SEM images for both untreated and PWW pretreated RS.

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