ディスポーザ排水を含む生活系排水を処理する膜利用浄化槽におけるカルシウムおよびリンの挙動

概要

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Effluent from garbage disposals contains large quantities of chicken bones and eggshells. Calcium and phosphorus in these food wastes may dissolve into the wastewater in the tank, resulting in high levels of calcium and phosphorus after processing the wastewater. In this study, we tried to elucidate the behavior of calcium and phosphorus in a tank using full-scale membrane bioreactors. The results were as follows. (1) Decomposing garbage produced organic acids at the bottom of the bioreactors. The average concentration of total organic acids was 2500mg・L^<-1>, of which butyric acid accounted for approximately 60%. (2) When chicken bones and eggshells were added to the organic acid solutions, calcium and phosphorus were confirmed to elute into the solution. (3) Calculation of the material balance in the tank revealed that only slightly over 3% of the total calcium was retained in the activated sludge: two-thirds was eluted into the processed wastewater. It also revealed that more than 20% of the total phosphorus accumulated in the activated sludge, and that approximately 20% eluted into the processed wastewater. Our results show that calcium and phosphorus show different behaviors in the tank.
社団法人日本建築学会の論文
2007-02-28