The objective of this project is to convert animal manure from an environmentally detrimental waste to a valuable resource. This is achieved through development of a sustainable Vietnamese biogas production system, which reduces greenhouse gas emissions and recycles nutrients from the animal manure in a safe and efficient way for plant and fish production. The project will enhance the Vietnamese capacity and competence for scientific research, education, policy making and public administration. This is achieved through: 1) training of PhD and MSc students, and consultants in biogas technology, 2) improving biogas technology, 3) increasing efficiency of the biomass as a fertilizer and a carbon source for soil, 4) reducing risk of pathogen spreading due to manure recycling and, 5) developing decision support systems to facilitate investments in biogas technology and life cycle assessments (LCA) to examine the environmental consequences of these choices. The project is organized with the principal Vietnamese (NIAH) and Danish institution (SDU) in the centre, surrounded by shell I with the partner institutions involved in the research and a shell II with institutions in close contact with the project partners. Contact will be through courses, workshops, newsletters, webpage etc. This network will inform end users about the outcome of the research. The network is will ensure that the competences and capacity obtained become an integrated and sustainable part of the institutional knowledge base.
Project Completion Report - Summary:
Livestock production is increasing and being specialized in Vietnam leading to the decoupling of livestock farming from plant production or fish farming. This has led to surplus liquid manure being discharged to waterways, and is the course of local environmental problems in form of odor, insects and risk of disease spreading.
The solution to the problem is the development of new management systems with environmentally friendly recycling of the manure. The advantage to the farmer being energy production, more efficient use of manure that reduces cost to fertilizer or increase in the value of manure sold in form of compost.
Decision support for optimal energy production with biogas digesters and for efficient manure recycling is now available for decision makers, extension officers and end users.Schemes for production of better compost are developed, which include addition of biochar during composting contributing to reduction of greenhouse gas emission, and treatment with urea that reduce the content of pathogens.
It is shown that mismanagement of biogas digesters causes increased greenhouse gas emission and don’t reduce the content of pathogens in the manure. As farmers learn biogas treatment reduces pathogens they may use the biogas-manure in manners that increase risks of pathogen spreading. The solution is training in better management and also in constructing better biogas reactors.