Thanh Tran, Phuong Loan Ngoc Nguyen, Hong Le Thi Anh, Phuong Nguyen Kieu Lan, Loc Tran Duong Thien, Giang Lam Van
The 3rd EnvironmentAsia International Conference on “Towards International Collaboration for an Environmentally Sustainable World”, June 17-19, 2015, Bangkok, Thailand
Sewage sludge from the wastewater treatment plant in Vietnam is facing difficulties due to a substantial increase in the volume of landfill waste and the environmental impacts. Therefore, anaerobic co-decomposition of sludge and residues of agricultural products (ratio of 2:0.5 and mesophilic conditions) are the most appropriate methods that not only solve environmental problems but also come with many other benefits such as recover a large amount of biogas and organic fertilizers. However, there are doubts about the quality and the negative impact on people and the environment from fertilizer originated from waste. This research aims is to impact assessment based on laboratory scale and application for pilot scale in the rice field. After that, the surveys directly farmers were carried out. Results from trial crop showed that fertilizer not only hasn’t adversely affectted the environment but also provided good support for the plant such as decrease of the amount of 50%-100% used chemical fertilizers (corresponding to the ratio of organic fertilizer and soil weight of 1% and 3%, respectively). Productivity in study case compared with control samples is equal. Therefore, farmers’ beliefs to organic fertilizer have also been significantly improved. Although the research is still undergoing different stages, its benefits to farmers, plants, and products are promising.
Keyword: Sewage sludge; bio-solid; waste; co-anaerobic decomposition; organic fertilizers; fertilizer originated from waste; rice fields.