Sludge treatment method

Abstract

The invention provides a sludge treatment method. The method comprises the following steps: step one, adding polychloride aluminum in the sludge, stirring and mixing to change the granularity size of the sludge; and step two, dehydrating the sludge obtained in the S1, wherein the dehydrating comprises repeatedly feeding materials and repeatedly mechanically dehydrating so as to obtain the dehydrated sludge. The method provided by the invention has the effect that the sludge with water content of 80% can be dehydrated to about 50% through the mode of adding less medicaments and using a high-pressure plate frame, the process is simple, and the dehydrating effect is good. Furthermore, the dosage of a conditioner is greatly reduced, especially the lime is unnecessary, the heat value of the sludge cannot be influenced, and the dehydrated sludge has high heat value, and is especially suitable for incineration disposition.

Description

technical field [0001] The invention relates to a method for treating sludge, in particular to a method for deep dehydrating sludge by using a plate frame. Background technique [0002] The sludge produced by the increasing urban and industrial sewage treatment plants has become a serious hidden danger of environmental pollution and a new difficulty in environmental pollution control. The general treatment methods of sewage plant sludge mainly include dehydration, modification, drying, etc., and the main disposal methods include sea reclamation, landfill, land utilization, building materials, incineration, etc., and the treatment of the above sewage plant sludge is the above-mentioned sewage Preconditions for sludge disposal. [0003] Sea reclamation has been banned in various countries; landfill covers a large area and requires anti-seepage treatment, and a biogas recovery system and infiltration water treatment plant must be built, which is likely to pollute groundwater a...

AI Technical Summary

Problems solved by technology

The terminal moisture of the sludge after dehydration by the dehydration method is in the range of about 75%-85%, resulting in incomplete volume reduction, terminal resource utilization does not meet the requirements, and the investment is large, the operating cost is high, and the effect is not ideal

[0005] In addition, there is a treatment method of sludge modification and drying, that is, adding a conditioner at room temperature to change the characteristics of the sludge, reduce the specific resistance of the sludge, and improve the dewatering performance of the sludge. Poor effect and other deficiencies

At the same time, the excessive addition of the conditioner will also lead to a reduction in the calorific value of the sludge combustion.

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