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The advantage of magnesium ammonium phosphate (MAP) precipitation method is the integrate of wastewater treatment and resources recovery. But generally, there have Ca2+ and Mg2+ in the wastewater, so there may have MAP and hydroxyapatite (HAP) simultaneously in the precipitate. The MAP can be used as slow release fertilizer directly; the HAP is just used as industrial raw material. So, the value of...
The landfill leachate was treated by magnesium ammonium phosphate (MAP) precipitation method. A series of single factor influence tests were conducted and the influence of these factors to MAP precipitation was analysed in this paper. The results showed that the optimum condition of MAP recycling were as follow: the best reagent was MgCl2·6H2O, the best pH value was 10, the best proportion of reagents...
In the long run, whether the use of chemical fertilizers could be reduced and soil fertility could be maintained through rice-fish coculture is less well known. At the pilot site of the rice-fish coculture system, which is one of the five “globally important agricultural heritage systems” (GIAHS), we conducted a 4-year study to compare fertilizer use, rice yield, and soil fertility in rice-fish coculture...
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