Method for cyclically applying sludge wastewater to sludge dehydration

Abstract

The invention discloses a method for cyclically applying sludge wastewater to sludge dehydration. The method comprises the following steps: 1) collecting wastewater: precipitating wastewater generatedafter sludge enters a filter press and is dehydrated, then centrally collecting the precipitated wastewater; (2) diluting and pulping: putting sludge with the water content of 80% into a conditioningtank, adding the wastewater collected in the step (1) into the conditioning tank, diluting the sludge until the water content is 93+ / -1%, adding a uniformly stirred liquid flocculating agent, fully mixing, standing for 10 min, starting to settle the sludge, separating mud and water, and sinking into the bottom of the conditioning tank; and 3) sludge dehydrating: conveying the sludge slurry prepared in the step 2) into the filter press through a high pressure and low pressure variable frequency screw pump to obtain a sludge cake with the water content of 50-55% and wastewater, feeding the wastewater into the step 1), centrally collecting and recycling, and using the sludge cake for brick making. The high-molecular cationic polyacrylamide flocculant is adopted, the dehydration efficiency ishigh, the wastewater obtained by sludge removal is used for dilution slurrying of the sludge, and the tap water consumption and the sewage treatment cost are saved.

Description

technical field [0001] The invention belongs to the technical field of urban sludge treatment and resource utilization, and in particular relates to a method for applying sludge wastewater circulation to sludge dehydration. Background technique [0002] The moisture content of the sludge from the sewage treatment plant is 80%. It needs to be collected centrally and dehydrated by a filter press to reduce the moisture content of the sludge from 80% to about 50%. During this period, it is necessary to carry out processes such as dosing, conditioning, dehydration, and pressing of the sludge to reduce the moisture content. Companies that usually use this process add lime, ferric chloride, flocculants and other agents to the sludge conditioning tank to flocculate and degrade the sludge to dehydrate it and reduce the moisture content of the sludge. However, there are still two problems in the treatment of sludge by these methods: one is that the water content of the sludge is stil...

AI Technical Summary

Problems solved by technology

However, there are still two problems in the treatment of sludge by these methods: one is that the water content of the sludge is still high; the other is that the water released from the sludge needs to be further treated before it can be discharged up to the standard, and the treatment cost is high.

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