Concentrated salt waste water atomizing concentration cyclic crystallization zero discharge system and process

Abstract

The invention belongs to technical field of water treatment and particularly relates to a concentrated salt waste water atomizing concentration cyclic crystallization zero discharge system and a concentrated salt waste water atomizing concentration cyclic crystallization zero discharge process. The concentrated salt waste water atomizing concentration cyclic crystallization zero discharge system and the concentrated salt waste water atomizing concentration cyclic crystallization zero discharge process are characterized in that the process comprises the following steps: (1) reducing the hardness of calcium and magnesium ions of to-be-treated concentrated salt waste water; (2) performing softening treatment on the concentrated salt waste water; (3) performing atomizing concentration on the waste water subjected to softening treatment; (4) performing cooling crystallization on supersaturated salt water after atomizing concentration; (5) performing multistage separation on the salt water after cooling crystallization; and (6) mixing the salt slurry after separation and heavy metal ion sludge generated in the step (1), performing crystal and liquid separation, and curing salt into sludge to form a mud cake. The concentrated salt waste water atomizing concentration cyclic crystallization zero discharge system and the concentrated salt waste water atomizing concentration cyclic crystallization zero discharge process have the following beneficial effects: the system and the process are low in investment, low in operation cost, high in operation reliability, large in operation elastic range and easy, flexible and reliable to operate.

Description

(1) Technical field [0001] The invention belongs to the technical field of water treatment, in particular to a zero-emission system and process for atomization, concentration, circulation and crystallization of concentrated salt wastewater. (2) Background technology [0002] Pollution prevention and control technology policies for thermal power plants: water pollution prevention and control in thermal power plants should follow the principles of classified treatment and multiple uses of one water, and encourage thermal power plants to realize the recycling of wastewater without discharge; desulfurization wastewater should be treated with lime, flocculation, clarification, neutralization and other processes Reuse after treatment; encourage the use of flue gas waste heat evaporative drying or evaporative crystallization and other treatment processes to prevent desulfurization wastewater from being discharged outside. [0003] Feasible Technical Guidelines for Pollution Prevent...

AI Technical Summary

Problems solved by technology

If the fouling equipment cannot continue to be used, and the power consumption of the MVR process is high, the process investment is high, and the cost of wastewater treatment per ton is high, reaching 60 yuan / cubic meter

[0009] MED process (multi-effect forced circulation evaporation and crystallization process) has low investment, but the process has high steam consumption, high power consumption, high operating costs, and high cost per ton of wastewater treatment, exceeding 80 yuan / m3

[0010] Multi-stage membrane concentration technology process has high reliability, low energy consumption and low investment when the liquid concentration is low and the concentrated concentration is low. When the concentration exceeds 10%, the investment and operating costs will increase significantly, and the operating reliability will be reversed. dramatically drop

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