The sludge is not discharged smoothly! !
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This is the case. Our factory mainly treats printing and dyeing wastewater. The treatment process is as follows: Raw water → reaction tank (PAC/aluminum sulfate + PAM) → primary sedimentation tank → biochemical tank (traditional activated sludge method) → secondary sedimentation tank → flotation → effluent. Since aluminum sulfate was used in the past, the cost was slightly higher, but the treatment was fairly stable. Some time ago, the person in charge of the company replaced aluminum sulfate with PAC in order to reduce treatment costs. After testing, the COD removal rate and decolorization efficiency of PAC are slightly higher than that of aluminum sulfate. However, the problem lies in the sludge discharged from the first sedimentation. The moisture content of the discharged sludge is much higher than that produced when using aluminum sulfate, and the sludge discharge time is very short. It turns into water after about 3-5 minutes. More and more mud accumulates in the pool, which seriously affects the sedimentation efficiency. Over time, FB sludge will float up. The parameters of this operation are similar to those before. Except for this problem, everything else is normal, so I can't figure it out. I would also like to ask all the senior experts to give me some advice! Thanks
If the dosage is constant, the amount of floc produced by PAC is not much greater than that produced by aluminum sulfate. Can the dosage of PAC be reduced? Have you added PAM? What is the method of mud removal?
I don’t know if the mud was scraped during the mud removal. If not, the situation is about the same. I can’t think of any other problems at the moment.