Concentrated salt waste water composite zero discharge system and process

Abstract

The invention belongs to the technical field of water treatment and particularly relates to a concentrated salt waste water composite zero discharge system and a concentrated salt waste water composite zero discharge process. The concentrated salt waste water composite zero discharge process is characterized by comprising the following steps: (1) reducing the hardness of calcium and magnesium ionsof to-be-treated concentrated salt waste water; (2) performing softening treatment on the concentrated salt waste water; (3) performing twice membrane concentration crystallization treatment on the soft water part of the treated water; (4) performing evaporation crystallization treatment on the concentrated salt water subjected to the first-time membrane concentration crystallization treatment; and (5) performing spraying crystallization on concentrate salt slurry and recovering the crystal salt after spraying crystallization into smoke. The system and the process have the following beneficial effects: the system is low in energy consumption, low in system investment, reliable in operation, low in treatment cost and small in sewage quantity, the operation of the subsequent dust-removing equipment is not influenced, mixed salt products are not generated, the crystal salt does not need to be subjected to one-step treatment, and the operation stability of the whole system is guaranteed.

Description

(1) Technical field

[0001] The invention belongs to the technical field of water treatment, in particular to a compound zero-discharge system and process for 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 Prevention and Control in Thermal Power Plants: In addition ...

Examples

Embodiment Construction

[0030] Accompanying drawing is a kind of specific embodiment of the present invention. This embodiment includes a triple box, the triple box is connected with an integrated precipitation filtration nanofiltration softener, the integrated precipitation filtration nanofiltration softener is connected with a membrane concentration device, and the membrane concentration device is provided with a STRO reverse osmosis device and a BWRO reverse osmosis device connected in sequence , the membrane concentration device is connected with the multi-effect evaporation concentrator of the evaporation concentration device, and the multi-effect evaporation concentrator is connected with the flue atomization injector of the spray crystallization device. The integrated sedimentation filtration nanofiltration softener is connected to the brine buffer tank of the membrane concentration device, the brine buffer tank is connected to the STRO reverse osmosis device through a brine pump, the STRO reve...

(1) Technical field

[0001] The invention belongs to the technical field of water treatment, in particular to a compound zero-discharge system and process for 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 Prevention and Control in Thermal Power Plants: In addition ...

Examples

Embodiment Construction

[0030] Accompanying drawing is a kind of specific embodiment of the present invention. This embodiment includes a triple box, the triple box is connected with an integrated precipitation filtration nanofiltration softener, the integrated precipitation filtration nanofiltration softener is connected with a membrane concentration device, and the membrane concentration device is provided with a STRO reverse osmosis device and a BWRO reverse osmosis device connected in sequence , the membrane concentration device is connected with the multi-effect evaporation concentrator of the evaporation concentration device, and the multi-effect evaporation concentrator is connected with the flue atomization injector of the spray crystallization device. The integrated sedimentation filtration nanofiltration softener is connected to the brine buffer tank of the membrane concentration device, the brine buffer tank is connected to the STRO reverse osmosis device through a brine pump, the STRO reve...

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