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Adding to Biogas Wiki article
Origin: Biogas

A new efficient technique of producing biogas from digester has been developed. The technique uses floral waste and food waste as feedstock, sodium carbonate and sodium bicarbonate as pretreatment. The digester is also heated with solar power to enhance production. The output of biogas and the concentration of methane are significantly increased.

Biogas plants
A biogas plant is the name often given to an anaerobic digester that treats farm wastes or energy crops. It can be produced using anaerobic digesters (air-tight tanks with different configurations). These plants can be fed with energy crops such as maize silage or biodegradable wastes including sewage sludge and food waste. During the process, the micro-organisms transform biomass waste into biogas (mainly methane and carbon dioxide) and digestate. (copied from Biogas)

Adding: A large amount of wastewater generated by human activities has negative impact on environment and human health. Due to the requirement to treat the pollution, turning the wastewater into biogas has been implemented by many plants. Higher quantity of biogas is produced when the wastewater is co-fermented with other residual from dairy industry, sugar industry, brewery industry. For example, while mixing 90% of wastewater from beer factory with 10% cow whey, the production of biogas is increased by 2.5 times compared to the biogas produced by wastewater from beer factory only.

Reason for adding: The abundance and toxicity of wastewater make it become a major feedstock for biogas plants. Since this part is not mentioned in this section, adding the up-to-date fact contributes to the completeness of the article.