Activated persulfate, method for degrading pollutants, and application of EDTA-VC

Abstract

The invention provides ferrous coordination system activated persulfate, a method of deeply degrading pollutants by using same, and an application of EDTA-VC. The ferrous coordination system activatedpersulfate is mainly composed of ascorbic acid, EDTA, Fe<2+> and persulfate. The method of deeply degrading pollutants by using the persulfate includes: adding the ferrous coordination system activated persulfate to to-be-treated wastewater containing the organic pollutants and nitrogen pollutants, controlling the pH of the reaction system to be 3-6, and performing degradation for 5-60 min at 15-50 DEG C. The ferrous coordination system activated persulfate can form a composite activated persulfate system; wherein by means of an effective Fe<2+> protection mechanism, the persulfate is activated without meaningless consumption of the persulfate.

Description

technical field [0001] The invention relates to the field of pollutant treatment, in particular to a method for activating persulfate with a ferrous coordination system and its deep degradation of pollutants, and the application of EDTA-VC. Background technique [0002] In recent years, the protection and restoration of the ecological environment have attracted much attention, especially the treatment of water pollution is the most urgent. The COD value is "chemical oxygen demand", which is the basic comprehensive index of water quality monitoring. The higher the COD value in the water body, the more serious the organic pollution, which will affect the surrounding environment and seriously endanger human health; the serious excess of nitrogen will make the water body rich. Nutritization, leading to a large number of algae, reducing the dissolved oxygen content in water, causing a large number of aquatic animals to die. In addition, nitrate nitrogen also has a potential impa...

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Problems solved by technology

The biological denitrification process is green and the degradation effect is good, but the conditions are strict, the treatment cost is high, and the effect on the system with high electrolyte content or low BOD value is very poor; catalytic reduction denitrification method: mainly photocatalytic method, using titanium dioxide As a carrier, the nitrate nitrogen is removed under ultraviolet light; the electrocatalytic method is used to remove the nitrate nitrogen in the water by applying an electric field. Although the catalytic reduction method has a good denitrification effect, it cannot be catalyzed in the actual sewage treatment. The reaction conditions required by the reduction method are difficult to achieve the desired degradation effect; the chemical reduction method is the easiest way, and active metals such as Fe, Mg, etc. are often used as reducing agents to reduce nitrate nitrogen or nitrite nitrogen. Wide range, low price, the ferrous iron generated after the reaction has no poisonous effect on the environment, and it is easy to be re-reduced and utilized by the reducing agent, so it is favored.

However, the system of reducing nitrate nitrogen with iron is greatly affected by the pH value. It has been reported that when the pH value is > 4, the reaction between Fe and nitrate stops, and if the amount of iron is not properly controlled, it is easy to generate ammonium ions, which cannot achieve real significance. Removal of nitrate nitrogen on

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