Method for simultaneously removing organic pollutants and ammonia in waste water and reactor

Abstract

A method for simultaneously removing organic pollutants and ammonia in waste water and a reactor. The method provided by the invention simultaneously accomplishes the degradation of organic pollutants by the activated oxygen catalytic oxidation and the removal of ammonia by spraying and air-stripping in the same reactor. The reactor, which comprises an upper part for stripping and removing ammonia and a lower part for the activated oxygen catalytic oxidation, is mainly composed of a housing, a water distributor, atomizing nozzles, a catalyst, a power pump, porous trays, a microporous aeration plate, air pumps and an air intake. The method provided by the invention is characterized in that waste water undergoes the pH value adjustment and flows into the atomizing nozzles from the upper water distributor; air flows into the reactor from the microporous aeration plate or the air intake; ammonia is stripped and removed during the fogdrop dripping process on one hand and through porous trays on the other hand; ammonia gas flows out of an outlet on the top and then is sent for a next treatment; fogdrop drips into an activated oxygen catalytic oxidation pool on the bottom; air flows from the microporous aeration plate on the bottom and reacts with the catalyst in the catalytic oxidation pool so as to produce oxygen-containing free radicals to remove organic pollutants in the waste water. The method for simultaneously removing organic pollutants and ammonia in waste water and the reactor in the invention are suitable for the treatment of diversified ammonia-containing organic waste water.

Description

technical field [0001] The invention relates to a method and a reactor for simultaneously removing organic pollutants and ammonia in waste water, belonging to the technical field of water pollution control. Background technique [0002] As a widely used advanced oxidation technology for water treatment, Fenton oxidation is especially suitable for the treatment of some refractory or biologically toxic industrial wastewater such as phenols, aromatic amines, aromatic hydrocarbons, pesticides and nuclear waste. The reason why Fenton's reagent has a very strong oxidation ability is that hydrogen peroxide can generate hydroxyl radicals (OH) under the catalysis of iron ions, and OH has a stronger oxidation electrode potential (2.8V ), than ozone (O 3 , 2.07V), and hydrogen peroxide (hydrogen peroxide, 1.77V) are 35% and 59% higher respectively, and the oxidation ability is second only to fluorine; in addition, OH also has high electronegativity (electrophilicity), and its electron...

AI Technical Summary

Problems solved by technology

Although the ammonia nitrogen removal rate of the ion exchange method is high, when the ammonia nitrogen concentration is high, the resin regeneration is frequent and the operation is difficult, and the regeneration liquid is still high ammonia nitrogen wastewater, the consumption of chemicals is large, and the treatment cost is high; There is a difference between the actual concentration of volatile substances such as ammonia nitrogen and the equilibrium concentration. Under alkaline conditions, air stripping or steam stripping is used to continuously transfer volatile substances such as ammonia nitrogen in the wastewater from the liquid phase to the gas phase. In order to achieve the purpose of removing ammonia nitrogen in wastewater, the stripping method can remove ammonia nitrogen, and the removal rate can reach 60% to 95%. The process flow is simple and the treatment effect is stable. As a mother liquor, it can also be absorbed by water to produce ammonia water or by sulfuric acid to produce ammonium sulfate by-product according to market demand, and the tail gas is returned to the stripping tower, but when the water temperature is low, the stripping efficiency is low, so it is not suitable for use in cold winter; chemical precipitation method It is a method to reduce the concentration of dissolved pollutants in water by adding a certain chemical agent to ammonia nitrogen wastewater to make it react with some soluble pollutants in the wastewater to form insoluble salts and precipitate them. Treatment of various concentrations of ammonia nitrogen wastewater, especially suitable for the treatment of high concentration ammonia nitrogen wastewater; the breakpoint chlorination method is to add excessive chlorine or sodium hypochlorite, and the ammonia in the wastewater is completely oxidized to N 2 This method has a fast reaction speed and requires less equipment, but the safe use and storage requirements of liquid chlorine are high, and the treatment cost is also high; catalytic cracking provides a comprehensive treatment of ammonia / ammonium-containing wastewater generated in the catalyst production process and recycling method

However, the current methods for removing ammonia from wastewater cannot effectively remove organic pollutants in wastewater without exception.

[0004] At present, there are few reports on the methods and reactors for simultaneous removal of organic pollutants and ammonia in wastewater

"Journal of Fudan University" (Volume 45, No. 3, 2006) reported a research paper entitled "Influencing Factors of Ammonia Nitrogen Removal by Electrochemical Oxidation". The concentration dropped from 26.8 to 6.1mg / L, and the concentration of ammonia nitrogen dropped from 19.9 to 0.1mg / L after the effluent treatment of the secondary sedimentation tank. At the same time, this process can remove organic matter in urban sewage to a certain extent; In China, there are only related patents on the removal of organic pollutants in wastewater by Fenton oxidation and the removal of ammonia by stripping method, such as the utility model invention patent of CN2937066Y, which is entitled " High-dispersion spray ammonia removal tower" patent, this utility model provides a high-dispersion spray ammonia removal tower, its high-dispersion elements are arranged in the tower body of the ammonia removal tower, located above the air inlet distributor, and the high-dispersion elements are formed by atomization Composed of nozzles and distribution water pipes, the atomizing nozzles are set up or down, and communicate with the feed water pump through the distribution water pipes and water inlet pipes; the tower uses high dispersion components to highly disperse the ammonia nitrogen wastewater, increasing the specific surface area of ​​​​the liquid, and improving the solubility in water. The rate at which free ammonia escapes from the liquid phase, so as to achieve the purpose of ammonia nitrogen removal in the solution

Images