Device and method for chemical wastewater reverse osmosis advanced desalination treatment without adding scale inhibitor

Abstract

The invention relates to a device for chemical wastewater reverse osmosis advanced desalination treatment without adding scale inhibitor. A raw water tank is communicated with a nanofiltration membrane component through a pipeline; a nanofiltration water inlet pump and a nanofiltration water inlet control valve are arranged on the pipeline of the raw water tank and the nanofiltration membrane component; a water-producing pipeline which passes through the nanofiltration membrane component is connected with a reverse osmosis membrane component; a reverse osmosis membrane component is connected with a reverse osmosis water-producing tank through a pipeline; the nanofiltration membrane component is also connected with a nanofiltration high-salinity water drain tank through a nanofiltration high-salinity water drain valve; and the reverse osmosis membrane component is also connected with a reverse osmosis high-salinity water drain tank through a reverse osmosis high-salinity water drain valve. The nanofiltration pretreatment can effectively lighten the pressure of the reverse osmosis desalination, and prevent scaling on the surface of the reverse osmosis membrane; and the scale inhibitor is not needed in the operation process. The device for the chemical wastewater reverse osmosis advanced desalination treatment has the advantages of simple process and reliable operation, can change the loading capacity based on the water yield, and is particularly applied to the wastewater treatment needing the recovery of salts.

Description

technical field [0001] The invention belongs to the technical field of desalination of water treatment, and relates to a device and method for reverse osmosis deep desalination treatment of chemical wastewater without adding scale inhibitors. Background technique [0002] Chemical wastewater has complex water quality components, high COD, high salinity, toxicity to microorganisms, poor biodegradability, and belongs to refractory wastewater. At present, chemical wastewater treatment is mostly combined with physical and chemical biochemical treatment and advanced treatment. Among them, biochemical treatment can reduce the content of organic matter in wastewater, and advanced treatment is mainly aimed at desalination. Chemical precipitation, multi-effect distillation and reverse osmosis desalination are generally used for desalination of chemical wastewater. Among them, the chemical precipitation method has high treatment costs, and the traditional distillation method consumes ...

AI Technical Summary

Problems solved by technology

However, due to the small pores of the reverse osmosis membrane, the surface of the membrane is easy to be fouled and blocked, and the influent water needs to be strictly pretreated. If antiscalants are added to prevent fouling, the concentrated water cannot be directly reused, and the mechanical strength of the membrane itself is poor. , so many drawbacks of reverse osmosis membranes have greatly limited the wide application of reverse osmosis membrane desalination in the deep desalination of chemical wastewater

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