INVESTIGATING ON COMPOSTING PROCESS FROM SLUGE OF HA THANH SUPPLY WATER TREATMENT PLANT

Abstract

The sludge treatment process of the Ha Thanh supply water treatment plant
was conducted by the aerobic composting with the open model, forced air
blowing and add cow dung or rice husk, or both and EM to reduce environmental
impacts and provide a kind of organic fertilizer for sustainable agriculture. The
results show that the mixture of sludge, cow dung, rice husk, and EM Fert -1 was
made compost in 30 days to get six composting samples, but, the best result was
three samples having the ratio of mas (6 sludge: 4 cow dung; 7 sludge: 3 cow
dung; 8 sludge: 2 cow dung), and their carbon concentration reached Compost
standard 10TCN 526:2002 of the Ministry of Agriculture and Rural Development
of Vietnam (2002). With the survey results, we choose the sample with an
optimal ratio of mass of 6 sludge : 3 cow dung, EM mass of 1.004g, and retention
time of 30 days. However, this fertilizer has low N, P, K concentration, so it needs
to add Urea, Super Phosphate, and Potassium Chloride.