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A simple MAP reactor made with PVC pipe was built as an experiment. The phosphorous removal and recovery by the struvite crystallization method were tried using swine wastewater taken from a feces-and-urine separate type piggery. It was possible to raise the pH of swine wastewater in the MAP reactor by aeration from the reactor's lower part and to make soluble PO4-P into crystallized PO4-P. During that process the pH rose for a short time, so the aeration intensity was high. With a reactor capacity of 200l, a wastewater holding time of 1 hour was required with an aeration of 30m3 h−1 m-3. Throughput was about 4.8m3\/day. When the swine wastewater of pH 7.7 and the soluble Mg\/PO4-P ratio of 0.48 was used, the crystallization rate of soluble PO4-P in this MAP reactor, 41% of the soluble PO4-P was removed by the crystallization. When the source of magnesium was added and soluble magnesium concentration in treated water became 40mg\/l, the removal ratio of PO4-P increased to 75%. The amount of phosphorous recovery by the simple MAP reactor using the swine wastewater of pH 6.94 involved a soluble Mg\/PO4-P ratio of 0.56 and a soluble PO4-P concentration of 63mg\/l. The reactor was equipped with stainless steel nets for MAP adhesion. A solution of 30% MgCl2 (0.1% of the volume of swine wastewater) was added, and the HRT in a reactor was set to 1 hour. The examination was carried it out for 44 days. The MAP weight adhering to the nets was 5.3kg. 0.61kg per soluble PO4-P, and 1kg MAP supplied in the MAP reactor was recovered. Using this equipment, the crystallization rate of soluble PO4-P can be raised to 70% or more by adding a source of Mg and raising the pH by aeration from the MAP reactor lower part. Moreover, 38g of MAP per 1m3 of swine wastewater supplied in the MAP reactor was recovered.<\/p>\n","protected":false},"excerpt":{"rendered":"
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