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  • optimization of struvite crystallization protocol for pretreating the swine wastewater and its impact on subsequent anaerobic biodegradation of pollutants

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 557
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     higher contents of nh+4 and ss in wastewater hamper the anaerobic digestion; necessitating its pretreatment to reduce them. this study reveals optimization of struvite/map precipitation protocol followed by anaerobic digestion of pretreated swine wastewater for pollutants removal. levels of different treatments: stirring speeds, 400 and 160 rpm; ph values, 9.0, 9.5, 10.0, 10.5, 11.0 and 11.5; and p:mg:n ratios, 1:1:1.2, 1:1:1.7, 1:1:2.2, 1:1:2.7, 1:1:4.0 and 1:1:5.0 were evaluated for map crystallization. among various combinations, protocol comprising of initial 10 min stirring at 400 rpm followed by 160 rpm for 30 min, ph 10.0, and p:mg:n ratio 1:1:1.2 rendered the best removal efficiency for nh+4, po3-4 , cod, tc and toc. subsequent anaerobic biodegradation revealed superiority of map supernatant over raw swine wastewater for methane yield and nh+4-n, po3-4 -p, cod, tc and toc removals. it suggests that struvite precipitation as pretreatment to anaerobic digestion is highly effective and advantageous in wastewater treatment.

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