Sludge treatment process

A sludge treatment and sludge technology, which is applied in dewatering/drying/concentrating sludge treatment, sewage/sludge fertilizer, cement production, etc., can solve the problems of excessive heavy metal content in grains and vegetables, human health hazards, and high operating costs. , to achieve the effect of no secondary pollution, no pollution to the atmospheric environment, and low operating costs
CN102167489AInactive Publication Date: 2011-08-31郑建国
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
郑建国
Publication Date
2011-08-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a sludge treatment process which comprises the following steps of: (1) diluting sludge with water; (2) pouring the diluted sludge to a stirring tank, and then adding a sludge modifier according to the weight before the sludge is diluted and then stirring, wherein the sludge modifier is prepared from the following raw materials: 40-70 percent of modified dolomite and 30-60 percent of magnesium chloride; (3) pumping the sludge in the step (2) to a plate-and-frame filter press and carrying out filter pressing and dewatering, wherein a spring is arranged between every two filter frames of the plate-and-frame filter press, the springs are uniformly distributed around the filter frames, and a feeding valve is arranged on a feeding pipe; (4) naturally drying the sludge dewatered in the step (3) at normal temperature; and (5) taking sludge as a combustion raw material, a cement raw material or a fertilizer raw material and bagging. By adopting additives and the mechanical filter pressing method, moisture in the sludge is removed, the moisture content in the sludge is lower than 45 percent, and heavy metals are solidified in the sludge and cannot be absorbed by root systems of plants, therefore damages to soil and human bodies cannot be caused.
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Description

technical field technical field

[0001] The invention relates to waste treatment, which is a sludge treatment process. Background technique

[0002] The sludge produced after the treatment of domestic water and industrial wastewater contains extremely complex heterogeneous bodies such as organic debris, bacterial cells, inorganic particles, and colloids. Since the water content of the sludge is as high as 85%, it is very easy to rot. Smelly, seriously polluting the environment. Since the dehydration of sludge is an extremely difficult technology, countries all over the world initially used the landfill method for sludge treatment. However, with the advancement of technology, it was found that the landfill of sludge did not eliminate pollution and caused serious damage to water. Resources and crops have serious harm. After entering the 1980s, the treatment of sludge has been greatly improved. At present, the better method that can really dehydrate and treat the sludge is:...

Claims

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