Sludge dewatering performance improvement method of boron-doped diamond electrode coupled calcium chloride

Abstract

The present invention relates to the technical field of sludge dewatering performance improvement, particularly to a sludge dewatering performance improvement method of boron-doped diamond electrode coupled calcium chloride. According to the method, a titanium-based boron doped diamond electrode is adopted as an anode and a stainless steel electrode plate is adopted as a cathode to form an electrolytic tank; a coupled calcium chloride raw material is added so as to destruct the flocculation structure in the sludge and the biological cell wall, such that the flocculation structure in the sludge and the bound water in the biological cell wall are exposed; and under the addition of the calcium ions, the calcium ions act with the exposed binding site of the bound water so as to release the bound water in the sludge, such that the sludge dewatering performance is substantially improved. Compared with the sludge treating separately using the boron doped diamond electrode as the anode or the sludge treating separately using calcium chloride, the method of the present invention has the following advantages that: the capillary water absorption time of the sludge can be reduced by 30-40%, the concentrations of polysaccharides, proteins and DNA in the supernatant can be increased by 12-24%, and the moisture content of sludge after centrifugation can be reduced to 70.6%.

Description

technical field [0001] The invention relates to the technical field of improving sludge dewatering performance, in particular to a method for improving sludge dewatering performance by coupling a boron-doped diamond electrode with calcium chloride. Background technique [0002] Sludge is an inevitable by-product of activated sludge treatment of wastewater in urban sewage treatment plants. With the continuous increase of domestic sewage, the amount of sludge produced by sewage treatment plants is also gradually increasing, which makes the further treatment of sludge an important task. current primary problem. Because the moisture content of the obtained sludge is relatively high, generally around 98%, it can be seen that the dewatering performance of the sludge is poor, which in turn leads to a large amount of sludge discharge and difficult solid recovery. The water in the sludge is composed of bound water, interstitial water, capillary water and free water, all of which exi...

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Problems solved by technology

[0004] However, there are still relatively few technical solutions for further treatment of a large amount of sludge produced after sewage treatment and adjustment to remove a large amount of water remaining in the sludge, especially by destroying the microbial cell walls in the sludge. The addition of calcium chloride substances makes calcium ions interact with the generated binding sites, and then the technical scheme for removing bound water in sludge has not been reported yet.

[0005] Moreover, the related technologies in the prior art are used to further treat the sludge, and the dehydration performance of the sludge obtained after the treatment is relatively poor, which cannot meet the purpose of removing a large amount of bound water in the sludge. The capillary water absorption of sludge is relatively high, the content of polysaccharide, protein and DNA is relatively low, and the water content of sludge after centrifugation is still high

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