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China - Eco-Farming Project : environmental assessment (Vol. 2) : Appendices (英语)

The Eco-Farming Project for China aims to achieve household and farm level environmental improvements through the establishment and improvement of biogas systems and biogas related on-farm investments. This environmental assessment (EA) document evaluated impacts, as follows : noise; solid waste disposal; contamination to surface water bodies; biogas leakage; public health and safety; construction of biogas digesters national standards; potential dangers of using untreated manure or minimally treated bio liquids or bio solids from biogas digesters on agricultural fields and the potentially harmful health related impact to humans. Based on this assessment the EA suggest mitigation measures, including : minimize generation of noise levels above national standards, especially close to sensitive areas such as schools and hospitals; re-use solid waste materials excavated during excavation of biogas digesters or dispose them at appropriate areas to prevent contamination of natural water bodies; biogas digester, biogas pipes and facilities will be installed according to national approved specifications to prevent leakage or breakdown; ensure that potential public health and safety risks due to biogas leakage are minimized; the inlet and outlet of the biogas system must be covered to avoid human or livestock falling into the tank; forbid fire in the range of 10 meters of the biogas digester; discharging residue, repairing and maintenance must be done with the guidance of technicians, who have got a construction license of biogas digesters; ensure that construction quality of the biogas, toilet and barn follow the project accepted and national standards; do not allow farmers to built biogas digesters without the guidance of technical staff; make sure that joint between the toilet and barn is airproof; ensure that animal manure and night soil enter the tank in time to prevent manure to stay in the open for a long time to prevent development of a suitable environment for flies and mosquitoes breeding; and finally, China's environmental policy, legislation, institutional, regulatory framework, international agreements relative to the protection of the environment of which China is a signatory, and compliance with the Bank's environmental operational safeguards directives.