Treatment method and equipment of high-salt waste water

Abstract

The invention provides a treatment method and equipment of high-salt waste water. The treatment method comprises the steps that A, agents are added to the high-salt waste water for pretreatment to reduce hardness, and then nanofiltration softening treatment is carried out to obtain a first separating medium and a first concentrated solution; B, the first separating medium is further purified to obtain pure water to be reused, and the first concentrated solution is returned to the step A to carry out agent adding pretreatment on the high-salt waste water as part of the agents to reduce the hardness. The treatment equipment comprises an agent adding pretreatment device, a nanofiltration softening device and a purifying device. The nanofiltration softening device comprises a first water inlet, a first concentrated solution outlet and a first separating medium outlet, the first concentrated solution outlet is connected with the agent adding pretreatment device, and the first separating medium outlet is connected with the purifying device. The treatment method has the advantages that the method is simple and convenient to operate, water produced through nanofiltration is recycled, the quantity of the added agents is reduced, pollution caused by discharging to environment is avoided, full environment friendliness is achieved, the waste water treatment capacity is high, and waste water zero discharging can be achieved.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a treatment method and equipment for high-salt wastewater. Background technique [0002] Wastewater produced in industrial production processes such as electric power, metallurgy, chemical industry, seawater desalination, printing and dyeing, and papermaking usually contains higher hardness and higher salt content. Higher hardness mainly refers to the high total concentration of calcium and magnesium ions in sewage , If such waste water is discharged directly without treatment, it will cause salinization of water and soil and endanger the natural environment. [0003] At present, the softening methods for such high-salt wastewater mainly include chemical methods and ion exchange methods. Chemical methods are the most common in the practical application of various high-salt wastewater to remove calcium and magnesium. The main mechanism is to add a certain amount of w...

AI Technical Summary

Problems solved by technology

The ion exchange method can effectively remove calcium and magnesium scaling ions, but there are regeneration problems in the resin or carrier during use

Regeneration agents are generally required in the regeneration process, which is expensive and causes secondary pollution to the environment. It is not suitable for the softening of high-hardness wastewater.

[0004] It can be seen that the treatment methods for high-salt wastewater in the prior art mainly combine chemical methods and thermal concentration methods, but this combination method not only consumes a large amount of chemicals and steam, but also increases operating costs virtually, and also polluted environment

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