Dewatering water advanced treatment softening system and process

Abstract

The invention discloses a dewatering water advanced treatment softening system and process. The process flow comprises the following steps: dewatering water from a mine, crystallizing and granulatinga fluidized bed, carrying out solid-liquid separation on the fluidized bed, and cleaning with a clean water tank. After being softened by the process, the total hardness of the water is effectively removed, the removal rate reaches 90%, the effluent turbidity is less than 5NTU, and the inflow requirement of the subsequent pre-desalination process is met. The system is high in equipment operation load, small in occupied area, compact in arrangement, easy to operate and adjust, stable in effluent quality, low in maintenance workload and high in automation degree. Compared with a traditional limeand soda ash softening process, the process has the advantages that the occupied area of a lime storage room is reduced, and the common problem of excessive addition of chemicals in lime treatment issolved; the problems of powder leakage, blockage and the like in the lime milk preparation process are eliminated, the operation site is pollution-free, and the management is convenient; calcium carbonate particles generated by crystallization and granulation can be recycled in a desulfurization system, so that the sludge output of the system is greatly reduced, and the operation cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment of drained water, and in particular relates to a softening system and process for advanced treatment of drained water. Background technique [0002] In recent years, for the treatment of drained water with low salinity and high suspended solid content, coagulation, sedimentation, filtration, disinfection and other processes are generally used to treat the effluent water quality to basically meet the requirements of production and living drinking standards. For the treatment of drained water with high salinity, coagulation, clarification and filtration with lime treatment are generally adopted, and the equipment selected is basically a clarification tank (or high-density clarification tank) plus a filter treatment method. [0003] At present, the common process adopts the lime softening and filtering process, by adding lime milk in the mechanically accelerated clarification tank (or high...

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Problems solved by technology

[0004] The lime softening and filtering reaction equipment is simple, and the lime agent required in the operation process is relatively cheap, but the lime treatment system occupies a large area, and the lime dosing system is prone to powder leakage, pipe blockage, etc. during operation, and water inflow When the content of suspended solids in the medium is low, the operation is more difficult, and the effluent water quality is prone to fluctuations

In addition, due to the addition of lime, the system produces a large amount of sludge, which increases the cost of sludge disposal

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