NIGHT SOIL TREATMENT APPARATUS

PROBLEM TO BE SOLVED: To recover phosphorus and nitrogen contained in a septic tank sludge or a mixed waste liquid of the septic tank sludge and raw night soil as recyclable magnesium ammonium phosphate (MAP). SOLUTION: A night soil treatment equipment has a mixing process 5 in which the septic tank sludge or the waste liquid of the septic tank sludge and the raw night soil is uniformly mixed, a flocculant mixing process 6 in which a flocculant is added to the waste liquid mixed in the mixing process 5 to be mixed the liquid, a solid-liquid separation process 8 in which the waste liquid to which the flocculant has been added in the flocculant mixing process 6 is subjected to solid-liquid separation for separating the waste liquid into supernatant liquid and the sludge, a dehydration process 9 in which the sludge separated in the solid-liquid separation process 8 is dehydrated, a MAP generation process 11 in which the supernatant liquid separated in the solid-liquid separation process 8 and filtrate generated by the dehydration process 9 are mixed to generate the MAP, a MAP recovery process 12 in which the MAP obtained in the MAP generation process 11 is recovered, and a biological reaction process 14 in which supernatant liquor from the MAP generation process 11 is subjected to nitrification and denitrification treatment. COPYRIGHT: (C)2004,JPO