BIOLOGICAL DEPHOSPHORIZATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a biological dephosphorization apparatus capable of reducing the volume of sludge and capable of stably removing phosphorus. SOLUTION: Raw water is introduced into an anaerobic tank 11 along with the return sludge from a sludge return pipe 14 to be subjected to anaerobic treatment and the treated water is aerobically treated in an aerobic tank 12 to be sent to a sedimentation tank 13. A part of sedimented sludge is returned to the anaerobic tank 11 and the remainder thereof is sent to a phosphorus discharge tank 15. A part of solubilized sludge from a slubilizing tank 20 is introduced into the phosphorus discharge tank 15 and phosphorus having a strong anaerobic degree is efficiently discharged. Thereafter, solid-liquid separation treatment is performed and a liquid component is subjected to dephosphorization treatment and a solid component is subjected to solubilization treatment and fermentation treatment to be returned to the anaeobic tank 11.