Microalga-based multi-technology coupled high-salinity water purification system

Abstract

The invention relates to a microalga-based multi-technology coupled high-salinity water purification system. A high-salinity water pretreatment device, a photo-bioreactor and a concentrated tank are sequentially connected with one another; a liquid output end of the concentrated tank is connected with a desalting chamber of a photo-biological desalting battery; an alga solution output end of a cathode chamber is connected with an inlet of the concentrated tank; an alga output end of the concentrated tank, a solid waste pretreatment device and a sewage pretreatment device are connected to a pulping mixer for mixing; the outlet of the pulping mixer is connected with a material inlet of a reactor in a supercritical water oxidation reaction system; a supercritical steam outlet of the supercritical water oxidation reaction system is connected with a hot steam inlet of an evaporator; and a strong brine outlet of the supercritical water oxidation reaction system and a concentrated solution outlet of the photo-biological desalting battery are connected with a cold water inlet of the evaporator. According to multiple processes for treating wastes and wastewater by the coupled photo-bioreactor, the photo-biological desalting battery and the supercritical water oxidation reaction system, products and energy in various processes can be subjected to internal recycling, and nitrogen and phosphorus can be effectively removed.

Description

technical field [0001] The invention relates to a high-salt water desalination system and various waste water treatment systems, in particular to a microalgae-based multi-tech coupling purification high-salt water system. Background technique [0002] High salt water purification mainly refers to the desalination treatment of seawater. As the shortage of freshwater resources is increasingly affecting the sustainable development of the national economy and society, desalination of seawater is an effective way to solve the problem of water shortage in coastal areas. At present, seawater desalination methods widely used in industry are mainly divided into two types: membrane method (reverse osmosis RO) and thermal method (multi-stage flash evaporation MSF and low-temperature multi-effect MED). The water recovery rate of seawater desalination is the main factor affecting its cost. The system recovery rate of traditional reverse osmosis seawater desalination projects is generally...

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Problems solved by technology

[0003] However, the improvement of the recovery rate of the RO system generally requires a higher operating pressure, which leads to faster membrane fouling and frequent cleaning and replacement of membrane elements, while the improvement of the recovery rate of the thermal desalination system requires a higher operating temperature. This brings scaling on the heat exchange tube wall and a decrease in heat exchange efficiency

At the same time, the energy consumption of the above two methods is also quite large, which increases the operating cost and reduces the yield of seawater desalination, and even the investment is higher than the benefit, which limits the use of seawater desalination

In addition, the RO system only plays the role of filtration and concentration, and discharges a large amount of high-salt, high-oxidation-enriched concentrated water. The discharge of concentrated water will cause secondary pollution and effluent with high nutrient content such as nitrogen and phosphorus. question

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