Reverse osmosis membrane concentration combined device and reverse osmosis membrane concentration combined technology for desulfurization wastewater

Abstract

The invention discloses a reverse osmosis membrane concentration combined device. The reverse osmosis membrane concentration combined device is characterized in that an outlet of a reverse osmosis membrane system raw water tank is connected with a security filter, an outlet of the security filter is connected with an inlet of a high-pressure pump and an inlet of an energy recovery device, an outlet of the high-pressure pump is connected with an inlet of a first circulating pump, an outlet of the first circulating pump is connected with an inlet of a first reverse osmosis membrane component, an outlet of the first reverse osmosis membrane component is connected with the inlet of the first circulating pump and an inlet of a second circulating pump, an outlet of the second circulating pump is connected with an inlet of a second reverse osmosis membrane component, an outlet of the second reverse osmosis membrane component is connected with the inlet of the second circulating pump and the inlet of the energy recovery device, an outlet of the energy recovery device is connected with an inlet of a booster pump, and an outlet of the booster pump is connected with the inlet of the first circulating pump. The invention further discloses a reverse osmosis membrane concentration combined technology. The reverse osmosis membrane concentration combined device and the reverse osmosis membrane concentration combined technology for the desulfurization wastewater have the advantages that desulfurization wastewater concentration effects are improved effectively, resource utilization is achieved and environment pollution, investment cost and operation cost are reduced.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater treatment, in particular to a desulfurization wastewater reverse osmosis membrane concentration combination device and process. Background technique [0002] SO 2 Exhaust pollution has become an important factor restricting thermal power construction. Among the existing desulfurization technologies for thermal power generation, limestone / gypsum wet flue gas desulfurization technology is mature and widely used. as desulfurization wastewater. Desulfurization wastewater contains a large amount of suspended solids, Cl - , F - , SO 4 2- , Ca 2+ , Mg 2+ and other substances, while containing trace amounts of heavy metal ions, highly polluting. [0003] The conventional treatment method for desulfurization wastewater is the chemical precipitation method, which is relatively simple to operate, but it occupies a large area, the effluent is unstable, and the effluent has a high sa...

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Problems solved by technology

[0003] The conventional treatment method for desulfurization wastewater is the chemical precipitation method, which is relatively simple to operate, but it occupies a large area, the effluent is unstable, and the effluent has a high salt content and is difficult to recycle, and the effluent will cause secondary pollution; direct use of evaporation technology or electrodialysis technology, high investment cost and operating cost, it is difficult to further promote, and the effluent of electrodialysis technology is difficult to meet the reuse requirements; membrane technology is a high-efficiency separation technology without phase change, the equipment is small in size and simple in structure, and can achieve low cost of wastewater Purification and desalination, while direct use of membrane technology requires strict pretreatment of desulfurization wastewater. Therefore, how to effectively combine membrane technology with other wastewater treatment technologies is the key to the advanced treatment of desulfurization wastewater and the realization of zero discharge requirements

[0004] The application number is 201510275955.2 Chinese patent, desulfurization wastewater zero discharge process and system, desulfurization wastewater is softened and hardened by adding medicine, then filtered by tubular ultrafiltration membrane, the water produced by the tubular ultrafiltration membrane is subjected to nanofiltration and salt separation, and the nanofiltration produced water enters seawater Reverse osmosis SWRO one-step concentration, because desulfurization wastewater is affected by various factors, the water quality changes greatly, when using SWRO one-step concentration, the requirements for influent water are strict, the requirements for pretreatment are high, and the cost of pretreatment chemicals is high

[0005] The application number is 201610189904.2 Chinese patent, a full-membrane method for the advanced treatment of desulfurization wastewater membrane separation combination zero discharge system, desulfurization wastewater is added to soften and harden, then TMF filtration is performed, TMF produced water is subjected to nanofiltration and salt separation, and nanofiltration produced water enters first After SWRO is concentrated, it enters DTRO for concentration. The SWRO concentrated water is firstly pressure-released and collected into the SWRO concentrated water tank, and then pressurized by a high-pressure pump into the DTRO concentrated water. The DTRO concentrated water is also directly pressure-released and collected into the DTRO concentrated water tank for subsequent evaporation treatment. The high pressure energy of SWRO concentrated water and DTRO concentrated water is not utilized, resulting in energy loss

[0006] The application number is 201310555063.9 Chinese patent, a zero-discharge treatment device and method for desulfurization wastewater. After the desulfurization wastewater is softened and hardened by adding drugs, it is filtered by a circulating membrane. The energy recovery device recovers the concentrated water pressure of the seawater membrane and the pollution-resistant high-pressure membrane, but there are two energy conversions of pressure energy-mechanical energy-pressure energy in the energy recovery process, there is energy loss, and the amount of membrane concentrated water is small, the energy of the turbine energy recovery device Recycling efficiency is low

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