Sludge pretreatment method

Abstract

The invention discloses a sludge pretreatment method. The method includes: immersing a positive electrode and a negative electrode of an electrooxidation device into the sludge to be treated; switching on the DC power supply; keeping the sludge to be treated in a state of flow; regulating the current density of the positive electrode and negative electrode; and conducting deep dehydration pretreatment on the sludge to be treated; the current density is greater than or equal to 20A / m<2> and is less than or equal to 12000A / m<2>. The method has the advantages of little secondary pollution, mild reaction conditions, operation under normal temperature and pressure, high energy efficiency, small reactor size, small area occupation, convenience starting and shutting-down of the device and obvious deodorization and sterilization effect.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a sludge treatment method. Background technique [0002] With the rapid development of economy and society and the gradual improvement of people's quality of life, the discharge of industrial wastewater and domestic wastewater is increasing day by day. Activated sludge method is a process commonly used in various sewage treatment plants at present. It has the characteristics of mature technology, stable process, high treatment efficiency, and low operating cost, but at the same time it will also produce a certain amount of excess sludge, and the amount of excess sludge Disposal costs account for more than 50% of the operating costs of the entire sewage treatment plant. [0003] According to China Water Network's "China Sludge Treatment and Disposal Market Analysis Report (2013 Edition)", by 2015, my country's annual surplus sludge (containing 80% moisture) output will exc...

AI Technical Summary

Problems solved by technology

The disadvantages are that the equipment structure is more complex, the current action time is limited, the current utilization efficiency is low, and the microstructure of the sludge is not effectively changed, the extracellular polymer is stripped, and the cell wall is damaged.

[0009] In the Chinese patent (CN201210232453-a treatment process for electrochemical direct oxidation of sludge), it only mentions the use of an oxidation reactor to oxidize and decompose sludge, which can be suggestive, but it still cannot meet the requirements, and it lacks the necessary The implementation technical parameters and specific implementation methods, so it is still difficult to implement industrial application by its method, so it is necessary to propose new process parameters and specific implementation methods

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