Method for treating sludge and promoting reduction of sludge by using ferrate

Abstract

The invention relates to a method of using ferrate for treating sludge and promoting dewatering and anaerobic digestion of excess sludge in sewage treatment plants so as to reduce sludge. The technical scheme of the method is that: after excess sludge is concentrated for 24 hours, concentrated sludge is firstly performed with oxidation treatment through ferrate and then is divided into two lines: one line is to directly add flocculating agent in sludge for dewatering, burying or burning, and the other line is to lead the sludge to enter an anaerobic digestion device so as to lead most of organic matter in sludge to be degraded, and then flocculating agent is added for dewatering, and finally sludge is buried or burned. The method can improve sludge dewatering performance, reduce excess sludge volume, enhance sludge anaerobic digestion performance, greatly improve methane yield, shorten anaerobic digestion time and greatly reduce expanse for sludge treatment and disposition, has the advantages of being simple in device, small in investment, free of pollution, convenient to operate and manage, high in economic benefit and the like, and is applicable to the industry and town sewage treatment plants.

Description

technical field [0001] The invention relates to a method for treating sludge with ferrate to promote dehydration and anaerobic digestion of excess sludge in a sewage treatment plant, thereby reducing the amount of sludge. The process can effectively reduce the output of excess sludge, reduce the subsequent treatment and disposal costs of excess sludge, and can be used in industrial and urban domestic sewage treatment plants (stations). Background technique [0002] The biological sewage treatment method based on activated sludge is currently the most widely used sewage biological treatment technology in the world, but it has always had one of the biggest drawbacks, that is, it will produce a large amount of excess sludge. With the increasing amount of sewage and the continuous improvement of sewage treatment rate, my country's sludge production will increase significantly in the next few years. Although the sludge volume only accounts for 1-2% of the sewage volume, the inve...

AI Technical Summary

Problems solved by technology

High treatment costs and increasingly restrictive laws and regulations make the disposal of excess sludge more serious, and the outlets for sludge are becoming more and more narrow

[0003] Because the sludge has a special floc structure and is highly hydrophilic, the sludge flocs contain a large amount of bound water, which is difficult to remove. Although the dehydration rate of the sludge is accelerated after conditioning, the sludge after dehydration The cake still has a high moisture content

All mechanical dehydration methods can only reduce the moisture content of dewatered sludge to about 75-80%, and it is difficult to further reduce it

On the other hand, anaerobic digestion is usually used to stabilize sludge. The traditional anaerobic digestion process has the following disadvantages: the sludge residence time is long, requiring 20-30 days, so the facility occupies a large area and the infrastructure cost is high; The removal rate of organic matter is low, only about 40%

This research report describes a ferrate oxidation sludge method. The final treatment result is that the sludge is oxidized and hydrolyzed, but it does not involve the relevant sludge treatment process, sludge dehydration and anaerobic digestion and other sludge treatment and disposal. content

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