Method for synchronously removing nitrate and phosphate in water by adopting three-dimensional electrolysis device

Abstract

The invention provides a method for synchronously removing nitrate and phosphate in water by adopting a three-dimensional electrolysis device. A diaphragm-free electrolytic system is formed by takinga copper/graphene oxide modified titanium electrode plate as a cathode and taking a chlorine evolution electrode plate as an anode; and meanwhile, iron carbon is added into water to form a three-dimensional electrode of a three-dimensional electrode electrolysis system to electrolyze water. Under the action of the current of the electrodes, a large amount of nitrate nitrogen is reduced by utilizing the copper/graphene oxide modified titanium electrode plate, and zero-valent iron of iron-carbon microelectrolysis can also be used for reducing the nitrate nitrogen, wherein the reduction product is ammonia nitrogen; the chlorine evolution electrode is adopted as the anode, and chlorine ions are used as a supporting electrolyte to carry out oxidization at the anode to generate chlorine; then the chlorine is dissolved in water to generate strong oxidant hypochlorous acid, wherein the hypochlorous acid can oxidize the reduction product ammonia nitrogen of nitrates into nitrogen; meanwhile, iron ions generated during a process that the nitrates are reduced by iron elementary substance are precipitated with phosphorus; and further adsorption is conducted by activated carbon, so that the removal effect of total phosphorus is enhanced.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a method for synchronously removing nitrate and phosphate in water by using a three-dimensional electrolysis device. Background technique [0002] Phosphorus, nitrogen and other elements in the water exceed the standard, which will accelerate the eutrophication of the water body. This phenomenon is more serious in our country, and it has brought great harm to industry, aquaculture, agriculture and tourism. The increase in the concentration of nitrogen, phosphorus and other nutrients is the cause of algal blooms, and phosphorus is the key factor. At the same time, excessive nitrate content will also cause harm to the human body and the natural environment. According to the current national regulations, it is mainly applicable to the discharge standards of Class IV water in general industrial water areas and recreational water areas in which the human body does not directly co...

AI Technical Summary

Problems solved by technology

However, the shorter the sludge age during the simultaneous denitrification and phosphorus removal of the traditional biological method, the higher the phosphorus content in the sludge, so it must be operated under a high load, but the sludge age is required to be longer in the denitrification process, and nitrification can only be performed in It can only be carried out in a low-load system with a long sludge age, so there is a certain contradiction in the sludge age of biological nitrogen and phosphorus removal, and this contradiction is more obvious when the water temperature is low

And when chemical phosphorus removal is added at the same time, it will have a certain impact on the growth of microorganisms

The remaining sludge produced by the use of biological methods is also a major hidden danger for environmental protection

Images