Device and method for treatment and recovery of nitrogen and phosphorus in wastewater by utilizing seawater desalination concentrate

Abstract

The invention provides a device and a method for treatment and recovery of nitrogen and phosphorus in wastewater by utilizing a seawater desalination concentrate. The device comprises a housing, wherein an inclined plate settling device and a clear water outlet are arranged at the upper part of the housing, a water inlet pipe is arranged at the lower part of the housing, a diversion plate for segmenting a housing channel into a diversion area and a circulation area is arranged in the housing, a baffle plate is arranged above the diversion area, a sedimentation area is arranged above the baffle plate, an outlet of the water inlet pipe is opposite to the bottom of the diversion area, an inlet of the water inlet pipe is connected with sewage and the concentrated wastewater produced by desalination of seawater, a sludge hopper and a sludge discharge pipe are arranged at the bottom of the housing, and a first circulation pump is arranged between the sludge discharge pipe and the water inlet pipe. The invention relates to the device and the method for nitrogen removal, phosphorus removal and recovery of the nitrogen and the phosphorus by taking a technology of using the concentrated wastewater produced by desalination of the seawater and reutilizing the reaction with phosphate ions to generate magnesium ammonium phosphate and hydroxyapatite crystals to achieve the recovery of the nitrogen and the phosphorus as the core, so that the treatment problem of the concentrated wastewater produced by a seawater desalination device can be solved, and the waste of resources and energy consumption can be further reduced.

Description

technical field [0001] The invention relates to a sewage treatment device, and the invention also relates to a sewage treatment method. Specifically, it is a device and a method for treating nitrogen and phosphorus in waste water by using seawater desalination concentrate. Background technique [0002] Among the many water pollution problems facing the world today, water eutrophication has always been a major environmental problem that plagues mankind. Due to the discharge of a large amount of nutrients rich in ammonia nitrogen and phosphate, algae and other plankton in rivers, lakes and oceans can multiply rapidly, resulting in the outbreak of "algae bloom" or "red tide", a large number of fish and shrimp deaths, and water quality problems to varying degrees deterioration. Not only will it cause huge economic losses to industrial and agricultural production, but it will also reduce the biodiversity of rivers, lakes, oceans and coastal areas, seriously threatening human he...

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Problems solved by technology

[0003] Since the 1950s, seawater desalination technology has been accelerated with the intensification of the water resource crisis. Among the more than 20 desalination technologies that have been developed, distillation, electrodialysis, and reverse osmosis have all reached industrial scales. The level of modernized production is widely used all over the world, but the concentrated wastewater produced by seawater desalination devices is often directly discharged back into the sea, which has not been effectively used, resulting in a great waste of resources

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