China has an estimated 700 million pigs, producing some two-thirds of the meat consumed there annually.
Pig waste contains a high level of nitrate, which
in liquid form can contaminate ground water and in flake form can
contaminate lakes, posing human health risks. Of 1.4 million metric tons (1.5 million tons) of pig poo a year only one tenth is used now as manure.
CRC for Contamination Assessment and Remediation of the Environment (CRC Care), a South Australian-based firm has a possible solution - using a bioreactor called "PooCareTM" and other
technology, the pig manure is converted into biofuel for cooking and
heating while the residual goes to farmers as nutrient-rich fertilizers. Solid waste is converted into a biogas that is then pumped
through gas tanks that can be delivered to the local community. The
entire process takes about a month, with the first biogenerator already
running at a farm in Wuhan, central China.
Source
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