Sludge treatment device and method

Abstract

The invention discloses a sludge treatment device and method. The sludge treatment device comprises a gravity concentrated sludge pond, a sludge-water separator, a lift pump, a wet-type oxidization tower, an air compressor, an ozone generator, a Venturi device, an ozone reaction tower and an activated sludge pond. The sludge treatment method comprises the steps of: conveying sludge into the sludge-water separator and then into the wet-type oxidation tower, stirring the sludge, introducing preheated air, and remaining for 1-2h; remaining for 60-80min when the wet-type oxidation tower has the temperature of 150-350 DEG C and the pressure of 1-8Mpa; and conveying the treated sludge into the ozone oxidation tower, introducing ozone with the amount of 0.10kg O3/kgmlss and reacting for 10-15min. The sludge treated with the method is rich in N, P and K and can be prepared into fertilizers by delivering the sludge to a fertilizer plant and adding a humic acid stock solution so that the quality of fruits and vegetable crops can be obviously improved and the production of melon and fruit can be increased; the treatment cost can be greatly reduced, and the obtained sludge has the moisture content lower than 10% and the total solid content reduced by 50%; and pathogenic bacteria can be inactivated, and the sludge treatment device and method can be better applied to the harmless, decrementing and recycling treatment of the urban sludge.

Description

technical field [0001] The invention belongs to the sludge treatment technology in the field of environmental protection, and is suitable for the digestion and treatment of residual activated sludge and mixed sludge produced by various biological processes in urban sewage treatment plants, especially for complex sewage treatment processes such as chemical sewage and odorous sewage. Digestion of biodegradable and refractory organic sludge produced in Background technique [0002] At present, the activated sludge method is still a commonly used sewage treatment method due to its low cost and low energy consumption. Because in the process of treating wastewater by this method, the generated sludge bottom material contains organic matter such as carbon, nitrogen, phosphorus, sulfur, etc., and these organic matter will be part of the synthesis of new bacterial cells, thereby forming excessive organisms, which need to be continuously removal to maintain a steady state sludge bala...

AI Technical Summary

Problems solved by technology

Landfill incineration of sludge may cause secondary pollution to soil and air, and the cost and energy consumption are high

[0003] The main disadvantages of the existing sludge treatment process are as follows: 1. The anaerobic digestion technology has high treatment costs and cannot recover available resources; 2. The volatile solid content in the primary sludge is low, the inorganic content is high, and the organic content is small , so the cost of incineration is high

The decomposition rate of sludge organic matter is only 25-45%, and the effect is not ideal

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