Method for biologically purifying municipal sewage and recovering resources
A technology for biological purification and resource recovery, applied in chemical instruments and methods, biological sludge treatment, multi-stage water/sewage treatment, etc.
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Embodiment 1
[0025] 1) Discharge the remaining pre-dewatered concentrated sludge (SS: 4000mg / L) produced by the urban sewage treatment plant into the sludge activation tank for aerobic aeration for 30 minutes to keep D0 at 2mg / L to activate the sludge;
[0026] 2) Then the activated sludge and urban sewage (COD 260-500mg / L, SS 220-350mg / L, ammonia nitrogen 24-40mg / L, soluble phosphate 2-5mg / L) are mixed according to the volume ratio of the raw sewage Mixed at a ratio of 1:3, discharged into the sludge adsorption tank for aerobic aeration for 30 minutes, so that the sludge and sewage are fully mixed, and the D0 is controlled at 1mg / L;
[0027] 3) Enter the mud-water mixture after step 2) aerobic aeration into the sedimentation tank, settle for 1.5 hours, and the supernatant after precipitation (COD about 160-240mg / L, SS 100-130mg / L, ammonia nitrogen 10- 20mg / L and phosphorus 1-2mg / L) into the traditional sewage purification system, the pollutants in the sewage are oxidized and decomposed, a...
Embodiment 2
[0034] 1) Discharge the remaining pre-dewatered concentrated sludge (SS: 4000mg / L) produced by the urban sewage treatment plant into the sludge activation tank for aerobic aeration for 30 minutes, keeping D0 at 4mg / L, and activate the sludge;
[0035] 2) Then the activated sludge and urban sewage (COD 260-500mg / L, SS 220-350mg / L, ammonia nitrogen 24-40mg / L, soluble phosphate 2-5mg / L) are mixed according to the volume ratio of the raw sewage Mixed at a ratio of 1:1, discharged into the sludge adsorption tank for aerobic aeration for 30 minutes, so that the sludge and sewage are fully mixed, and the D0 is controlled at 2mg / L;
[0036]3) Enter the mud-water mixture after step 2) aerobic aeration into the sedimentation tank, settle for 2 hours, and the supernatant after precipitation (COD about 160-240mg / L, SS 100-130mg / L, ammonia nitrogen 10-20mg / L and phosphorus 1-2mg / L) into the traditional sewage purification system, the pollutants in the sewage are oxidized and decomposed, a...
Embodiment 3
[0043] 1) Discharge the remaining pre-dewatered concentrated sludge (SS: 4000mg / L) produced by the urban sewage treatment plant into the sludge activation tank for aerobic aeration for 30 minutes to keep D0 at 3mg / L to activate the sludge;
[0044] 2) Then the activated sludge and urban sewage (COD 260-500mg / L, SS 220-350mg / L, ammonia nitrogen 24-40mg / L, soluble phosphate 2-5mg / L) are mixed according to the volume ratio of the raw sewage Mixed at a ratio of 1:2, discharged into the sludge adsorption tank for aerobic aeration for 30 minutes, so that the sludge and sewage are fully mixed, and the D0 is controlled at 1.5mg / L;
[0045] 3) Enter the mud-water mixture after step 2) aerobic aeration into the sedimentation tank, settle for 2 hours, and the supernatant after precipitation (COD about 160-240mg / L, SS 100-130mg / L, ammonia nitrogen 10-20mg / L and phosphorus 1-2mg / L) into the traditional sewage purification system, the pollutants in the sewage are oxidized and decomposed, a...
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