Membrane separation combination zero-emission system for deeply treating desulfurization wastewater with whole membrane method

Abstract

The invention belongs to the technical field of treatment of desulfurization wastewater and particularly provides a membrane separation combination zero-emission system for deeply treating desulfurization wastewater with a whole membrane method. The system comprises a pretreatment water tank, a water quality regulating water tank, a first reaction tank, a sedimentation water tank, a second reaction tank, a concentrated water tank, an TMF (tubular micro-filtration) assembly, a produced water tank and an NF (nanofiltration) assembly which are sequentially communicated through a pipeline, wherein a produced water outlet of the NF assembly is connected and communicated with an SWRO (seawater reverse osmosis) assembly through a pipeline, a concentrated water outlet of the SWRO assembly is connected and communicated with a DTRO (disk tubular reverse osmosis) assembly through a pipeline, and a concentrated water outlet of the NF assembly is communicated with a wastewater collecting tank through a pipeline. With the adoption of the membrane separation combination zero-emission system for deeply treating desulfurization wastewater with the whole membrane method, the pure water recovery rate is higher, the occupied area is small, the cost is low, resource utilization is realized, membrane assemblies cannot be blocked by dirt, stable operation of the membrane system is guaranteed, the wastewater treatment efficiency is improved, resource waste is avoided, and meanwhile, unnecessary environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of desulfurization wastewater treatment, and in particular relates to a membrane separation combined zero discharge system for advanced treatment of desulfurization wastewater by a full-membrane method. Background technique [0002] The types of metal ions in desulfurization wastewater include conventional heavy metals (Cd, Cu, Cr, Ni, Pb, Zn, etc.), as well as some other non-heavy metal ions, such as As, Ba, Mo, Fe, Al, Sn, Ra, etc., while There are also features such as high salt content and high suspended solids. The common feature of these pollutants is that adding some chemicals can form precipitates. The traditional desulfurization wastewater treatment method adopts the chemical precipitation method. This treatment method needs to set up a sedimentation tank. Considering that the sedimentation water cannot completely remove the suspended solids SS and heavy metal suspended solids in the water quality,...

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Problems solved by technology

Hollow fiber membrane has the advantages of smaller equipment footprint and low price, but the biggest problem with fiber membrane technology is the engineering risk caused by broken filaments and membrane clogging, especially the problem of membrane clogging, which makes it suitable for heavy metal wastewater with high solid concentration. During processing, the frequency of cleaning and downtime for maintenance is too high to be of practical value

Tubular microfiltration membrane technology is relatively mature. Tubular microfiltration membranes use thicker membrane elements than fiber membranes. However, the water quality after treatment fluctuates greatly, and the salt content is high, so it is easy to crystallize and precipitate, resulting in scaling and fouling of the membrane. Phenomenon

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