Dehydration method of heterogeneous sludge

Abstract

The invention relates to a dehydration method of heterogeneous sludge. According to the dehydration method, firstly, mixed sludge is pre-dehydrated by a chamber type filter press and crushed by a crusher, and then crushed sludge filter cakes are put into a steel belt filter press for secondary crushing through a middle hopper bin. The dehydration method disclosed by the invention can effectively solve the problem about intermittent work mode of an existing filter press, changes intermittent work into continuous work by effectively combining the chamber type filter press with the steel belt filter press, and integrates the characteristics that a plate frame type filter press realizes rapid dehydration when treating low-concentration mixed sludge and the steel belt filter press realizes rapid dehydration when treating high-concentration mixed sludge, so that the dehydration time is effectively saved and the production speed is increased; meanwhile, due to the dehydration process, the usage amounts of additives can be saved and the virtuous circle of enterprise production is guaranteed.

Description

technical field [0001] The invention relates to a sludge dehydration method, in particular to a dehydration method in which sludge with different components is mixed together, that is, a heterogeneous sludge dehydration method. Background technique [0002] With the continuous development of urbanization and the continuous increase of industrial output, the discharge of sewage is also increasing day by day, and new requirements are put forward for the harmless treatment of sludge. [0003] At present, the water content of various sludges is generally above 97%, but to make the sludge useful, the water content must be reduced to below 50%, so the sludge needs to be dehydrated. At present, the dehydration of sludge on the market mainly adopts the following methods: (1) thermal drying method: add dehydrating agent or dry materials to the sludge, supplemented by high-heat baking, so as to reduce the moisture content of the sludge However, this method consumes a lot of energy an...

AI Technical Summary

Problems solved by technology

At present, the dehydration of sludge on the market mainly adopts the following methods: (1) thermal drying method: add dehydrating agent or dry materials to the sludge, supplemented by high-heat baking, so as to reduce the moisture content of the sludge However, this method consumes a lot of energy and is costly to use. After reaching the use standard, the sludge generated in the end will be incinerated to realize its use value.

(2) Plate and frame filter press dehydration method: The plate and frame filter press has obvious dehydration effect when dehydrating low-concentration sludge with a moisture content of 98% to a moisture content of 60%. When the sludge with a water content of 50% is limited by the machine structure and process method, the efficiency is not high and the production capacity is low

(3) Belt filter press dehydration method: The dehydration of belt filter press is characterized by continuous operation and easy maintenance of the machine, but when low-concentration sludge enters the filter belt, it is easy to run mud, the filter cake particles are relatively thin, and the output It is relatively low, but when the water content of the sludge is 60%-70%, it has high treatment efficiency, which limits the adaptability of the machine. The composition of heterogeneous mixed sludge is complex, the concentration is low, and dehydration is difficult.

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