Treatment system and method for hydroxyl free radicals to kill bloom microalgae and mineralize organic pollutants

Abstract

The invention discloses a treatment system for killing water bloom microalgae and minimalized organic pollutants by a hydroxyl free radical and a method thereof. The treatment system is provided witha hydroxyl free radical strong oxidization pre-treatment system, a hydroxyl free radical mineralized organic pollutant system, a sodium hypochlorite sterilizing unit, a central control system, a residual chlorine online monitor, a coagulative precipitation tank, a sand filter pool, a clean water pool, a sodium hypochlorite storage tank, a mechanical pump, a controller, a water flowmeter, a magnetic valve and a unit water outlet valve. The hydroxyl free radical strong oxidization pre-treatment system is provided with a hydroxyl free radical strong oxidization pre-treatment device, a first waterjet flow cavitation liquid-liquid dissolving device and a first residual chlorine online monitor. The hydroxyl free radical mineralized organic pollutant system comprises a hydroxyl free radical mineralized organic pollutant device, a second water jet flow cavitation liquid-liquid dissolving device and a second residual chlorine online monitor.

Description

technical field [0001] The invention relates to the treatment of water bloom microalgae and organic pollutants, in particular to a treatment system and method for killing water bloom microalgae and mineralizing organic pollutants by hydroxyl radicals. Background technique [0002] Lake water or river reservoir water is an important source of drinking water for surface water in my country. With the development of economy, the nutrient load of drinking water source for surface water is increasing day by day. The main pollution indicators in water bodies are chemical oxygen demand, total phosphorus and ammonia nitrogen. Elevation of the algal blooms in spring and summer. In recent years, my country's Dianchi Lake, Chaohu Lake, Taihu Lake and other large freshwater lakes are basically in a state of eutrophication. A large number of algae blooms broke out in the lake, and the water body smelled abnormally and was dark brown. The death of algae led to further deterioration of wate...

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Problems solved by technology

[0005] Chinese patent CN106044875A discloses a treatment method and system for high-algae water, which uses the method of adding different filter materials to filter out high-algae, but this method requires frequent replacement of the membrane, and the cost is high

Chinese patent CN104176839A discloses a treatment system using membrane treatment and powdered activated carbon dosing, but the membrane used needs to be chemically cleaned, and the added powdered activated carbon adsorbed on the membrane surface may also aggravate membrane fouling

However, damage to the algal cell wall may cause the overflow of solutes in the algae, releasing algal toxins

Chinese patent CN101948153A discloses an ultrasonic-ultraviolet coupling pretreatment device for high-algae raw water, but the treatment capacity of this method is only 3m 3 / h, it is difficult to realize the application of waterworks

[0006] Comprehensive analysis of the above high-algae water treatment technologies shows that although the physical method will not cause the algae cells to rupture and release intracellular solutes, the filter membrane needs to be replaced frequently, and the cost is relatively high

Although traditional chemical methods can effectively kill algae, it is easy to cause secondary pollution and produce toxic disinfection by-products

Hydroxyl radicals generated by advanced oxidation technologies such as ultraviolet method can quickly kill algae and mineralize organic pollutants, but most of the advanced oxidation technologies have a small water treatment volume and cannot be applied in large-scale water plants

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