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 mg/g DM, nitrogen mg/g DM and phosphorus 2 mg/g DM. | TRƯỜNG ĐẠI HỌC SƯ PHẠM TP HỒ CHÍ MINH HO CHI MINH CITY UNIVERSITY OF EDUCATION TẠP CHÍ KHOA HỌC JOURNAL OF SCIENCE KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ NATURAL SCIENCES AND TECHNOLOGY ISSN: 1859-3100 Tập 14, Số 9 (2017): 114-121 Vol. 14, No. 9 (2017): 114-121 Email: tapchikhoahoc@; Website: 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* Industrial University of Ho Chi Minh City Received: 25/7/2017; Revised: 14/9/2017; Accepted: 23/9/2017 ABSTRACT 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 mg/g DM, nitrogen 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. Keywords: composting, fecal coliform, sludge, urban lake. TÓM TẮT Nghiên cứu phương pháp đơn giản ủ sinh học hiếu khí nhằm giảm thiểu fecal coliform trong bùn thải nạo vét từ Hồ Hoàn Kiếm - Hà Nội Tại các đô thị ở
