Pilot-scale struvite recovery from anaerobic digester supernatant at an enhanced biological phosphorus removal wastewater treatment plant

Ochre, waste iron sludge from the treatment of iron rich groundwater for potable use, makes up a significant waste problem. Furthermore, wastewater treatment plants with enhanced biological phosphorus removal and the digestion of sludge are in lack of iron for the prevention of hydrogen sulfide production and the release of phosphorous during anaerobic digestion. Thus, the addition of ochre to anaerobic digestion is a potential beneficial reuse of ochre. Sludge from wastewater treatment plants with enhanced biological phosphorus removal was used for the experiments. Batch and continuous pilot-scale tests were performed for the mesophilic digestion of primary and waste-activated sludge with different doses of ochre. Two different doses of ochre corresponding to molar ratios of 1 and 2 moles Fe3+/mole P released in the batch test resulted in 29% and 57% reductions of phosphates respectively in the sludge liquor compared to the control sludge without inhibiting the digestion process. In the pilot experiment, the dosing of ochre at both a high and low dose (molar ratios of 1.6 and 0.8 Fe3+/S2−, respectively) resulted in an immediate drop in the H2S concentration (from >2000 ppm down to 570 ppm), while the control reactor still produced biogas with a high hydrogen sulfide concentration. The inhibition of the digestion process was observed (accumulation of acetate) at the higher dose. In a second pilot scale experiment, lower doses of ochre were tested continuously (1.5 and 0.75 mole Fe3+/mole Preleased) to avoid any inhibition, while evaluating the phosphate precipitation. A reduction of phosphates in sludge liquor (33% and 66% for the low and high doses respectively) was obtained.

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TWO YEARS OF BIOLOGICAL PHOSPHORUS REMOVAL WITH AN ADVANCED MSBR® SYSTEM AT THE SHENZHEN YANTIAN WASTEWATER TREATMENT PLANT

Proceedings of the Water Environment Federation ◽

10.2175/193864704784136801 ◽

2004 ◽

Vol 2004 (8) ◽

pp. 144-156

Author(s):

Chester Yang ◽

Gu Gaowei ◽

Li Baowei ◽

Li Hongyuan ◽

Lu Wanshen ◽

...

Keyword(s):

Wastewater Treatment ◽

Wastewater Treatment Plant ◽

Phosphorus Removal ◽

Treatment Plant ◽

Biological Phosphorus Removal ◽

Biological Phosphorus

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Analysis on Phosphorus Removal from Domestic Wastewater Treatment Plant by Biological Aerated Filter

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.641-642.299 ◽

2013 ◽

Vol 641-642 ◽

pp. 299-302 ◽

Cited By ~ 1

Author(s):

Yin Song Liu ◽

Hong Jun Han ◽

Chun Yan Xu ◽

Bing Wang ◽

Jian Feng Tan

Keyword(s):

Wastewater Treatment ◽

Wastewater Treatment Plant ◽

Phosphorus Removal ◽

Treatment Plant ◽

Domestic Wastewater ◽

Biological Aerated Filter ◽

Biological Phosphorus Removal ◽

Domestic Wastewater Treatment ◽

Aerated Filter ◽

Biological Phosphorus

Hydrolysis acidification / pre-denitrification biological aerated filter was adopted in a domestic wastewater treatment plant. The effluent was accorded with a standard in the Integrated Wastewater Discharge Standard（GB18918-2002）, in which the effluent phosphorus was demanded below 0.5mg/L. Through analysis on the process biological phosphorus removal, biological method can be found to total phosphorus 1.5 mg/L. If you reach level to an emissions standards, phosphorus chemical experiment research, finally determined by strategy for the CN pool, point for adding potions FeCl3, dosing quantity for 35mg/L.

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