Flue gas washing wastewater reusing-processing device adopting STRO device and method thereof

Abstract

The invention discloses a flue gas washing wastewater reusing-processing device adopting an STRO device and a method thereof. The device comprises following components connected to flue gas washing wastewater in sequence: a heat exchanger, a wastewater regulating tank, a first reaction tank, a first precipitation tank, a second reaction tank, a microfiltration concentration tank, a tube type microfiltration device, a pH neutralization tank, a microfiltration produced water tank, an STRO device, an STRO produced water tank, a RO device, and a reused water tank. A circulation loop, which comprises a circulation pump, is arranged between the microfiltration concentration tank and the tube type microfiltration device. The wastewater in the microfiltration concentration tank is delivered to thetube type microfiltration device through the circulation pump to carry out solid-liquid separation. Wastewater circularly flows in the tube type microfiltration device. The filter membrane produced water enters a next stage unit. Concentrated water flows back to the microfiltration concentration tank. The conventional technologies are reasonably integrated, the discharged water can completely meet the reuse standards or discharge requirements, the wastewater recovery rate can reach 60% or more, and the operation of the device is stable.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to the treatment and recycling of smoke washing waste water produced by wet desulfurization in waste incineration power plants and other industries. Background technique [0002] Smoke washing wastewater (deacidification wastewater) refers to the flue gas washing wastewater generated in the process of flue gas purification (wet desulfurization) of incinerators in waste incineration power plants and other industries. [0003] With the improvement of the level of urbanization and industrialization, the shortage of water resources and the aggravation of water pollution have become global problems that need to be solved urgently. The shortage of water resources has become an important restrictive factor for my country's economic and social development. The regeneration and reuse of industrial wastewater has been paid more and more attention, and the relevant st...

AI Technical Summary

Problems solved by technology

[0007] Disadvantages of the existing technology: Since the existing technology only uses a single flocculation sedimentation + filtration process, and there are fewer types of chemicals added, it has a good removal effect on some pollutants in the waste water from washing smoke. Standards are raised, some pollutants cannot be removed (such as chloride, sulfate, TDS, etc.), and some pollutants (such as COD, ammonia nitrogen, total nitrogen, etc.) are not completely removed

In addition, after repeated recycling of tobacco washing wastewater, the salt and hardness in the water are getting higher and higher, which will eventually lead to crystallization and fouling of the washing tower, which cannot continue to be recycled in the alkali washing tower

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