Researching the simple solution of composting for the minimization of fecal coliform in sludge dredged from Hoan Kiem Lake in Hanoi - Vietnam

  • Le Hung Anh

Tóm tắt

In Vietnam’s urban areas, lakes play a very important role in climate regulation as well as contributing to flood protection. In the capital city of Hanoi, there are currently 142 lakes. These lakes are dredged annually and the sludge should be treated. Two types of matter present in the sludge require treatment: coliform and fecal coliform. The aim of this research is to utilise the simple solution of composting for treating the sludge which is dredged from Hoan Kiem Lake, Hanoi. Results from analyzing the sludge showed its contents: carbon 72.3 mg/g DM, nitrogen 7.9 mg/g DM and phosphorus 2 mg/g DM. Therefore, we focused our research on adding high carbon content materials (such as straw, husk and peat coal) urea and phosphorus. The research also involves the additition of microorganism mixture Biomix, which includes Bacillus subtilis and Streptomyces in order to boost the composting process as well as to support the biological endeavor to reduce the coliform. The results show that the mixture containing 96% sludge, 3% rice straw and 1% compost mixed with the Biomix generated the best results. The time period of composting had effects on the density of fecal coliform.

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Phát hành ngày
2017-11-01