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  • combination of struvite pyrolysate recycling with mixed-base technology for removing ammonium from fertilizer wastewater

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 578
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     removal of ammonium from wastewater via struvite (map) pyrolysate recycling combined with a mixed-base naoh/mg(oh)2 technology was investigated, and the phosphate and magnesium concentration in the supernatant were measured. the optimal parameters for acidolysis were a ph of 1; temperature of 120 °c and time of 2 h. the presence of derivatives of amorphous magnesium hydrogen phosphate (mghpo4), namely magnesium phosphate (mg3(po4)2) and magnesium pyrophosphate (mg2p2o7) were verified by experiment. the ammonium removal ratio in this combined mixed-base technology was 96.8% in the first cycle, 80.6% in the second, and 81.0% after acidolysis. the phosphate and magnesium ions concentration in the supernatant were about 1 mg/l and 40 mg/l, respectively. the grain size of map was 1.52 nm without seeding and 1.79 nm with seeding, and the growth rate of map was 17.6%.

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