Method for controlling sludge expansion in biological pool and sewage treatment method
A sewage treatment method and sludge expansion technology, which are applied in biological water/sewage treatment, water/sludge/sewage treatment, and adjustment methods of biological treatment, etc. The effect of good treatment effect, fast settling speed and high microbial activity
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Embodiment 1
[0045] A sewage treatment plant has a daily sewage treatment capacity of 30,000 tons per day, and undertakes the industrial wastewater treatment of 21 printing and dyeing enterprises in the area. The plant adopts a multi-stage treatment process of pretreatment + activated sludge method + advanced treatment. Influent water quality: CODcr is 940mg / L, BOD 5 The SS is 210mg / L, the SS is 432mg / L, the color is 256 times, and the pH value is 7.9. The effluent water quality is: CODcr is 45mg / L, BOD 5 It is 1mg / L, SS is 5mg / L, the chromaticity is 30 times, and the pH value is 7.0. During operation, sludge bulking occurred in a biological pool of a certain line, and the sludge volume index rose to 250ml / g. The results of sludge microscopy showed that a large number of filamentous bacteria grew and reproduced, causing sludge bulking.
[0046] The method steps for rapid control of sludge bulking and improvement of sludge settleability are as follows:
[0047] (1) Choose a particle size...
Embodiment 2
[0054] A sewage treatment plant has a daily sewage treatment capacity of 10,000 tons per day, and the treated sewage is printing and dyeing industrial wastewater. The plant adopts a multi-stage treatment process of pretreatment + activated sludge method + advanced treatment. Influent water quality: CODcr is 629mg / L, BOD 5 113mg / L, SS 264mg / L, effluent water quality: CODcr 52mg / L, BOD 5 2mg / L, SS 5mg / L. During the operation, a line of biological pools had sludge swelling caused by filamentous bacteria, and the sludge volume index was 200ml / g.
[0055] The method steps for rapid control of sludge bulking and improvement of sludge settleability are as follows:
[0056] (1) Choose a particle size of 150 mesh and a bulk density of 0.55g / cm 3 wood activated carbon;
[0057] (2) According to the above-mentioned sludge volume index 200ml / g, the activated carbon dosing ratio R is determined to be: activated carbon concentration: sludge concentration=1:3;
[0058] (3) According to...
Embodiment 3
[0063] A paper-making enterprise produces 20,000 tons of sewage per day, and the sewage treatment process of the enterprise adopts a multi-stage treatment process of pretreatment + activated sludge method + advanced treatment. Influent water quality: CODcr is 1700mg / L, BOD 5 It is 530mg / L, SS is 823mg / L, and the pH value is 8.2. The effluent water quality is: CODcr is 86mg / L, BOD 5 It is 13mg / L, SS is 15mg / L, and the pH value is 7.3. During the operation, sludge bulking occurred in the biological pool, and the sludge volume index increased to 150ml / g. The results of sludge microscopy showed that the growth and reproduction of filamentous bacteria caused sludge bulking.
[0064] The method steps for rapid control of sludge bulking and improvement of sludge settleability are as follows:
[0065] (1) Choose a particle size of 300 mesh and a bulk density of 0.5g / cm 3 wood activated carbon;
[0066] (2) According to the above-mentioned sludge volume index of 150ml / g, the activ...
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