System and process for deep dehydration of sludge by using ultrahigh pressure squeezer

Abstract

The invention discloses a system and process for deep dehydration of sludge by using an ultrahigh pressure squeezer. The system comprises a sludge tank, primary sludge dewatering equipment, a sludge conditioning device, a dry sludge conveying device, an ultrahigh pressure squeezer and a blanking and sludge discharging conveying device which are connected in sequence, and further comprises a quantitative dosing device connected with the sludge conditioning device, wherein a feeding port is formed in one side, namely, a feeding end, of the ultrahigh-pressure squeezer; a full material test sensor and a switch valve are arranged on the other side of the ultrahigh pressure squeezer, namely, a top back flushing opening far away from the feeding end; the full material test sensor is connected with the signal input end of a PLC control system, and the switch valve is connected with the signal output end of the PLC control system; and the sludge conditioning device adopts a double-screw stirrer. The system can solve the problem of deep dehydration of the sludge with the moisture content of about 80%, can reduce the moisture content of the municipal sludge to 50% or below on the premise of low cost, and is convenient for harmless, reduction, stabilization and resourceful treatment of the municipal sludge.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and relates to a system and a process for deep dehydrating sludge by using an ultra-high pressure press, in particular to a system and a process for treating stock sludge by using a new ultra-high pressure press. The stock sludge mentioned here mainly refers to the sludge (water content is usually 75%-85%) after one-time dehydration with conventional dehydration equipment. The source of sludge is usually but not limited to municipal sewage treatment plants, water plants and various industrial and mining enterprises. Produced sludge with high organic matter content. Background technique [0002] Sludge mainly refers to the solid-liquid phase mixture produced in the process of sewage treatment and water supply treatment, which is an inevitable by-product of sewage treatment. The composition and properties of sludge produced by different sewage and treatment processes are also different. ...

AI Technical Summary

Problems solved by technology

In order to use the membrane filter press for secondary deep dehydration on this basis, the sludge with a moisture content of 80% must be diluted back to sludge with a moisture content of 92-95% (5%-8% solid content) before operation. This obviously redundant design in the process chain causes huge waste of cost

Or remove all the original traditional dehydration equipment, and directly use the membrane filter press to dehydrate the thin sludge with a moisture content of 97-99% (1-3% concentration), but the working efficiency of this equipment is very low, and it needs to be doubled. The scale and quantity of the host device

In recent years, manufacturers of belt filter presses have developed high-pressure belt-type deep dehydrators, which can directly dehydrate materials with a moisture content of about 80% for a second time. However, because of the limited pressure of high-pressure bag filter presses, it is often necessary to invest Increase the cost of chemicals, especially the need to add lime, plant ash and other powders to improve the dewatering performance of sludge. Under the above conditions, it is also difficult to reduce the moisture content of sludge to below 60%.

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