Nghiên cứu xử lý thu hồi phốt pho trong nước thải chăn nuôi bằng phương pháp kết tủa struvite

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Luận văn:	Study on phosphorus recovery from digested piggery wastewater by struvite precipitation = Nghiên cứu xử lý thu hồi phốt pho trong nước thải chăn nuôi bằng phương pháp kết tủa struvite. Luận văn ThS. Khoa học môi trường và bảo vệ môi trường
Nhà xuất bản:	ĐHKHTN
Ngày:	2011
Chủ đề:	Khoa học môi trường Quản lý chất thải Xử lý ô nhiễm Nước thải
Miêu tả:	57 p. + CD-ROM Luận văn ThS. Quản lý chất thải và Xử lý vùng ô nhiễm -- Trường Đại học Khoa học Tự nhiên. Đại học Quốc gia Hà Nội, 2011 This research studied on struvite precipitation as a method to remove and recovery phosphorus in the real digested piggery wastewater to form a product as fertilizer. There are many factors that affect to the precipitation of struvite such as pH, ion molar ratios, aeration, mixing energy, temperature… In this study, series of jar-test experiments were conducted to investigate the influence of pH, Mg molar ratio, Ca ions and mixing speed to the phosphorus removal efficiency and the crystallization of struvite. Experiments with lab-scale reactor in batch and continuous mode were also conducted to investigate the kinetic of phosphorus removal, the controlled struvite crystallization and the quality of the generated product. The results showed that, a) At pH at 9.25, the phosphorus removal efficiency was the highest. b) Increasing Mg molar ratio (from 1 to 2.5) and stirring speed (from 50 rPhần mềm to 100 rpm) led to enhanced phosphorus removal efficiency. c) Ca ions play important role in both phosphorus removal efficiency and crystallization of struvite. A presence of Ca ions at Mg:Ca of 4:1 to 2:1 will increase the phosphorus removal efficiency and affect the morphology of struvite crystals compared to Mg:Ca of 1:1, 2:1 or 1:0. d) The rate constant of phosphorus removal in the pilot-scale experiment with digested piggery wastewater when Mg ions added estimated as 0.050 min-1 or 3.00 hr-1. e) It is possible to attach and grow struvite crystals on stainless steel mesh in order to recover it as fertilizer Electronic Resources
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Tags: kết tủa struvite trong nước thải sinh hoạt