Sludge high-dry dehydration conditioning method

Abstract

The invention discloses a sludge high-dry dehydration conditioning method. The sludge high-dry dehydration conditioning method comprises the following steps: preparing sludge, polymer ferric salt and plant ashes according to a ratio of parts by weight of 1000:(5-7):(30-50), mixing and stirring the materials, and mechanically filter pressing and dehydrating the mixture to obtain mud cakes, wherein the sludge is from a sewage treatment plant, the moisture content of the sludge ranges from 90% to 99%; the ratio of parts by weight of 1000:(5-7):(30-50) is based on the absolute dry weight of the sludge. The polymer ferric salt and the plant ashes are used as conditioning agents to condition and modify the sludge, so that the cost is low; the moisture content of the mud cakes after dehydration is about 50%, and meets the follow-up treatment requirement; furthermore, the aspects of organic content, calorific value and pH value of the mud cakes are improved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a high-dry sludge dehydration conditioning method. Background technique [0002] With the rapid development of social economy and urbanization, the number and scale of construction of urban sewage treatment plants are constantly increasing, which leads to the generation of surplus sludge (that is, the sludge discharged from the primary sedimentation tank) of sewage treatment plants The amount is also increasing, and the moisture content of the remaining sludge is high, so it needs to be dehydrated in depth to reduce the volume of the sludge, thereby reducing the difficulty of subsequent sludge treatment. At present, enterprises mainly use mechanical methods to dehydrate excess sludge, but the solid matter in excess sludge has a certain affinity with water, so the dehydration effect of purely mechanical methods is poor. Add some conditioning agents to the sludge ...

AI Technical Summary

Problems solved by technology

At present, enterprises mainly use mechanical methods to dehydrate excess sludge, but the solid matter in excess sludge has a certain affinity with water, so the dehydration effect of purely mechanical methods is poor. Add some conditioning agents to the sludge to destroy the affinity between the sludge and water, so that the mechanical dehydration effect of the sludge can be effectively improved

[0003] In the prior art, enterprises mostly use a mixture of ferric chloride and quicklime as a conditioner to add to the sludge. However, in practical applications, it has been found that the mud cake obtained by using this method will be used in subsequent composting, incineration and land use. There are certain limitations in utilization and other aspects, especially in the incineration process, a large amount of dioxin will be produced, so the mud cake obtained by dehydration after conditioning by the above method is mostly disposed of in landfill, which not only cannot realize the effective utilization of resources , and undoubtedly increased the cost of sludge treatment

Images