Device and method for cell wall breaking in municipal sludge dewatering process

Abstract

The invention discloses device and method for cell wall breaking in a municipal sludge dewatering process. The device comprises an adjusting pond, a stirrer, a hot water tank, a hot water pump, a hot water pipe which is communicated with the adjusting pond through a heat exchanger, a sludge pump, a valve, a sludge inlet pipe which is communicated with the adjusting pond through the heat exchanger, an alkaline liquid tank, an alkaline liquid pump, an alkaline liquid pipe which is communicated with the adjusting pond, and a dewatering machine which is connected with the adjusting pond, wherein the filtrate from the dewatering machine is discharged through the heat exchanger, and the adjusting pond is provided with an alkaline liquid concentration sensor, a temperature sensor and a controller and is in connected connection with the sludge pump, a water pump, the alkaline liquid pump, the motor of the stirrer, the dewatering machine and the valve. The cell wall breaking method comprises the following steps of: (1) performing a pretest; (2) preparing an alkaline liquid; (3) loading sludge to the adjusting pond in which the sludge is preheated; (4) adding alkali to adjust the pH of the sludge and allowing mixed reactions to take place; (5) starting the dewatering machine and a filtrate return device; (6) detecting the sludge mixed reaction results at a preset time, to ensure optimum wall-breaking dewatering effect of the sludge; and (7) repeating from the step (3) to the step (6). The device and method provided by the invention are applied to the wall-breaking treatment prior to the dewatering treatment of the sludge, has a perfect structure, is easy to operate, and improves effects.

Description

technical field [0001] The invention relates to a device and method for cell wall breaking, in particular to a cell wall breaking device and method for municipal biological sludge dehydration. Mainly used in municipal sewage treatment plant sludge pretreatment. Background technique [0002] At present, biological sludge, a by-product of sewage treatment plants, has become a hot spot of concern. The main reason is that the biological sludge itself contains a large number of pathogenic bacteria and organic matter. If it is not treated effectively, it will have a bad impact on the environment, causing environmental problems such as the spread of odor, the breeding of mosquitoes and flies, and the pollution of groundwater. At present, the in-plant treatment of sludge mainly adopts the method of "concentration + mechanical dehydration" for preliminary treatment. According to the national standard, the moisture content of the sludge cake should be below 80%, and the subsequent di...

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Problems solved by technology

Similar methods are also applied, but this method can minimize the amount of alkali dosage and heat supply, and can meet the sludge wall breaking requirements when the water content of the dewatered cake is reduced to below 75%, and can effectively solve the water content of the mud cake. The problem of high rate can be solved, and at the same time, it can also reduce the cost of pretreatment of broken walls, and reduce the cost of comprehensive disposal

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