Treatment device and method for wastewater containing ammonia nitrogen and phosphorus

Abstract

The invention discloses a treatment device and method for wastewater containing ammonia nitrogen and phosphorus. The device comprises a wastewater tank, a pH regulation unit, a high-position tank, anelectrolyte preparation device and an electrolytic catalytic oxidation unit; the wastewater tank is connected with the pH regulation unit through a water pump; the pH regulation unit is connected withthe high-position tank; the high-position tank is connected with the electrolyte preparation device and a water inlet in the lower portion of one end of the electrolytic catalytic oxidation unit; theelectrolyte preparation device is connected with the water inlet in the lower portion of one end of the electrolytic catalytic oxidation unit; a water outlet of the electrolytic catalytic oxidation unit is formed in the upper portion of the other end of the electrolytic catalytic oxidation unit. The invention also discloses a treatment method for wastewater containing ammonia nitrogen and phosphorus. The device is simple in structure, resistant to corrosion and convenient to operate; in the method, the emission concentration of ammonia nitrogen is smaller than or equal to 3 mg / L, the emissionconcentration of phosphorus is smaller than or equal to 0.25 mg / L, and the integrated wastewater discharge standard of the Ministry of Environmental Protection is met; the process is simple, the costis low, and no waste gas is emitted.

Description

technical field [0001] The invention relates to a wastewater treatment device and method, in particular to a wastewater treatment device and method containing ammonia nitrogen and phosphorus. Background technique [0002] The smelting or processing of zinc, manganese, tungsten and other metals will produce a large amount of wastewater containing ammonia nitrogen and phosphorus. If it is directly discharged, it will cause eutrophication in a large area of ​​the water body, leading to the deterioration of the water environment and directly threatening human health. In particular, the ammonia nitrogen and phosphorus wastewater discharged by some industries has complex components, strong toxicity, and strong carcinogenicity, thereby further deepening the pollution of water bodies. At the same time, it also brings great difficulties to the water supply project, such as the deterioration of water quality, the formation of biofouling to block pipes and equipment, and the impact of ...

AI Technical Summary

Problems solved by technology

Although the operating cost of the biological method is low, microorganisms need to be cultivated and domesticated, and the biological treatment occupies a large area and has strict temperature requirements; while the chemical precipitation method and stripping method have high costs and are difficult to meet the standards; the membrane interception method has high requirements for water quality and is easy to accumulate. Scale blockage increases treatment costs; although the electrolytic catalytic oxidation method occupies a small area, the ammonia nitrogen treatment reaction speed, the ammonia nitrogen or total phosphorus index after wastewater treatment can be stably below 0.5mg / L, but the process is difficult to control and the treatment cost High, the cathode material is not corrosion-resistant, and the ammonia nitrogen or total phosphorus indicators are difficult to meet the standards at the same time.

[0004] CN108751325A discloses an ammonia nitrogen wastewater treatment system and ammonia nitrogen wastewater treatment method, CN108793518A discloses an ammonia nitrogen wastewater treatment method and device, CN108249645A discloses an ammonia nitrogen wastewater treatment system, and CN104230061A discloses a ammonia nitrogen wastewater catalytic oxidation treatment method, both It is a device or method that uses electrolysis to treat ammonia nitrogen wastewater. They have common technical defects: the cathode material is not corrosion-resistant, the cost is high, and the electrolytic cell is not completely sealed, causing the generated waste gas to spread outward and pollute the environment.

CN107857426A discloses a comprehensive treatment method for phosphorus-containing wastewater, which is to use potassium permanganate to oxidize organic phosphorus substances in wastewater into inorganic phosphorus, and filter to remove impurities, but the biggest technical defect is high cost

However, the disadvantage is that the process is long, waste residue will be generated, and the waste water needs to be heated to 75°C, which consumes a lot of energy.

However, the disadvantage of the above-mentioned method is that it needs to consume metal iron, aluminum or magnesium, the cost is high, and it can only treat wastewater containing orthophosphate. If the wastewater contains phosphorous acid or hypophosphite, this method cannot handle it, and it cannot Removal of ammonia nitrogen; as for the electrolysis of heavy metal ions, there will also be problems, because the electrolytic method of removing heavy metal wastewater cannot meet the discharge standards, and must be further treated with alkali and chemical precipitation to filter before the discharge can meet the standards

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