Sludge treatment method and electrochemical appliance

Abstract

The invention discloses a sludge treatment method and an electrochemical appliance. The sludge treatment method includes: mixing sodium sulfate with activated sludge to obtain a mixture; placing the mixture into an electrolytic bath, placing an activator between the anode and the cathode of the electrolytic bath and performing electrochemical treatment; continuously adding framework materials in the mixture subjected to the electrochemical treatment prior to stirring to complete treatment of sludge. The electrochemical appliance comprises the electrolytic bath and an iron rod, an anode plate and a cathode plate are arranged in the electrolytic bath, the iron rod is arranged between the anode plate and the cathode plate, the anode plate is of an IrO2-RuO2 / Ti electrode plate, and the cathode plate is of a Ti electrode plate. On the basis of electrochemistry-advanced oxidation-framework combined sludge treatment method, sludge dewatering property can be remarkably improved, and the sludge can be odorless after dewatering and stable in property.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sludge treatment method and an electrochemical device. Background technique [0002] With the development of society and urbanization in our country, the increase of sewage treatment volume will inevitably lead to more sludge generation. However, due to various reasons such as technology, economy, environment, society and law, 80% of the sludge in sewage treatment plants in my country cannot be properly treated and disposed of, causing serious secondary pollution, and the bottleneck of sludge disposal technology often lies in sewage. The mud has high moisture content and poor dehydration performance. [0003] The characteristics of high organic matter content, small particle size, strong hydrophilicity, large specific surface area, and strong colloidal structure in sludge make it difficult to dewater. The dewatering performance of sludge has a lot to do with the existi...

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Problems solved by technology

Among them, electrochemical treatment is the use of electrochemical methods to degrade refractory organic matter or biotoxic pollutants, which is widely used in wastewater treatment, and has also been applied to sludge treatment in recent years, but its dehydration effect is not good; chemical conditioning Based on Fenton's advanced oxidation technology, it can cause partial oxidation of sludge and improve dehydration performance, but the reaction needs to be carried out at a pH of about 3, which makes subsequent disposal of sludge difficult and easily causes secondary pollution

In addition, by adding an inert filter aid to form a hard skeleton in the sludge, reduce the compressibility of the sludge to improve the filtration performance of the sludge, but it has no obvious effect on improving the existence of bound water in the sludge

The effect of a single sludge conditioning method is limited. Therefore, the use of combined conditioning methods to improve sludge dewatering performance has become a research hotspot in sludge conditioning.

[0006] Luo Haijian and others studied cationic polyacrylamide combined with skeleton particle sawdust to condition urban sludge, and Wang Dongsheng and others studied the combination of enzyme cracking and inorganic flocculant to condition urban sludge. The research shows that the dewatering performance of sludge after the two methods are combined to condition sludge It is better than the effect of a single method of conditioning, but the former does not decompose the sludge, the existence of a large number of extracellular polymers, and the high content of sludge bound water hinder the further improvement of sludge dewatering performance. During the process, the filter cake becomes more and more compact, which greatly hinders the circulation of water. Therefore, there are certain limitations in the joint conditioning of sludge by these two methods.

Yang Jiakuan and others studied the combination of skeleton particle gypsum and persulfate to condition urban sludge. The disadvantage of this method is that the method of activating free radicals is single, the sludge cracking ability is limited, and the dosage is relatively large.

In addition, Wu Shouqun and others used electrolysis and flocculant to condition sludge, but because electrolysis has limited ability to degrade EPS, a large amount of bound water remains in the sludge, and the sludge dewatering performance is not improved well.

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