The Potential of Wastewater from Kha Nom Lah Production Process for Biogas Production

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Aneak Sawain
Chanika Saenge Chooklin
Chutinut Sujarit
Somrak Rodjaroen


Wastewater from the Kha Nom Lah production process is highly contaminated with organic matter, this is caused by the use of water in the process of preparing rice flour as raw materials in the production process. This wastewater has a foul smell caused by the decomposition process of contaminated organic matter and results  in water pollution when it is released into public water sources. This research aims to study the potential of wastewater from the Kha Nom Lah production process for biogas production. It is a guideline for utilizing this wastewater and treating it to reduce the organic loading, through the removal of organic matter, turning it into biogas by anaerobic digestion process. The results demonstrate the potential of wastewater from the Kha Nom Lah production process to be utilized for biogas production. The biogas generation rate is between 0.023±0.001 liter per liter of wastewater/day. The results of the biogas yield calculation compared to the COD removal, the values were between 0.08±0.02 liter per gram of COD removed. The removal of organic matter in wastewater resulted in the average efficiency of removing organic matter in the form of COD and BOD was 65.9±0.8 and 68.6±2.3 percent, respectively. The results of the measurement of methane gas in biogas show that the average methane content was 62.2±1.7 percent (% LEL), and from the test it was found that the biogas can ignite. This will be a guideline for utilizing wastewater from the Kha Nom Lah production process for biogas production, supporting the production of renewable energy from waste in this industry. The biogas produced can be used to replace LPG gas in the production process or use it in the household, as a renewable energy to reduce energy costs.


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