A method of treating wastewater

Details A method of treating wastewater A method of treating wastewater

C - Chemistry, Metallurgy

02

F

C02F 3/30 (2006.01) C02F 3/04 (2006.01) C02F 3/28 (2006.01)

Patent

CA 2132592

A method of improving the quality of septic tank effluent is disclosed. Sewage wastewater having a significant concentration of waste solids is flowed to a septic tank. In the septic tank the solids are allowed to separate from the wastewater to form a relatively clear horizontal liquid layer between sludge and scum layers. At least a portion of the liquid layer is flowed from a recirculation outlet through an aerobic filter to produce a filter effluent. The filter effluent is collected and flowed to the septic tank. A septic tank effluent is discharged from a septic tank discharge outlet which is spaced apart from the inlet and which is in fluid communication with the liquid. The septic tank effluent has reduced levels of total nitrogen, BOD and total suspended solids.

Méthode permettant d'améliorer la qualité des effluents de fosses septiques. Des eaux usées ayant une concentration considérable de déchets solides sont acheminées vers une fosse septique où les solides se séparent des eaux usées pour former une couche de liquide horizontale relativement claire entre des couches de boue et d'écume. Au moins une partie de la couche de liquide s'écoule d'une sortie de recirculation et passe à travers un filtre aérobie afin de produire une eau de refoulement de filtre, laquelle est recueillie et acheminée à la fosse septique. Un effluent de fosse septique est refoulé par une sortie de refoulement située à l'écart de l'entrée et en communication fluide avec le liquide. L'effluent de la fosse septique présente des niveaux réduits d'azote total, de DBO et de matières solides totales en suspension.

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