CN201276469Y

CN201276469Y - Apparatus for processing difficult biochemical treatment ammonia nitrogen wastewater by break-point chlorination

Info

Publication number: CN201276469Y
Application number: CNU2008200453336U
Authority: CN
Inventors: 黄海明; 肖贤明; 晏波; 陈启华
Original assignee: Guangzhou Institute of Geochemistry of CAS
Current assignee: Guangzhou Institute of Geochemistry of CAS
Priority date: 2008-03-25
Filing date: 2008-03-25
Publication date: 2009-07-22
Anticipated expiration: 2018-03-25

Abstract

A breakpoint chlorination device for refractory ammonia nitrogen wastewater treatment, characterized in that the oxidation reaction tank is supported by a bracket and is located above the reduction reaction tank, the oxidation reaction tank and the reduction reaction tank are connected through a connecting pipe with a valve, and the top of the oxidation reaction tank has Stirrer, pH meter, oxidant inlet, pH regulator inlet, waste water inlet, inlet pipe and aerator connected to it at the bottom, the chlorine leaked from the reaction in the tank is absorbed by the chlorine absorption device and stored in the reserve tank; The top of the reduction tank is equipped with an agitator and a reducing agent inlet, and a waste water outlet at the bottom. The beneficial effect of the utility model is that the device occupies less land, is simple to operate, is convenient, safe and stable to operate, is not affected by climate conditions, does not cause chlorine gas leakage pollution, and has extremely fast waste water treatment speed, and a small device can handle large batches Wastewater treatment requires less equipment investment and low treatment cost. After treatment, the ammonia nitrogen concentration in the effluent is less than 2mg/L, the total nitrogen is less than 3mg/L, and does not contain residual chlorine.

Description

A kind of breakpoint chlorination is handled difficult biochemical treatment ammonia nitrogen waste water device

Technical field

The utility model relates to a kind of device that adopts break point chlorination to handle difficult biochemical treatment ammonia nitrogen waste water.

Background technology

Ammonia nitrogen is industry and one of sanitary wastewater major pollutants discharged, because of it is a kind of nutritive substance, can cause pasture and water and algae grows in a large number in being discharged into water body, and seriously the oxygen in the consume water is a principal element that causes body eutrophication.More for the selectable treatment process of high-concentration ammonia nitrogenous wastewater, as reverse osmosis, magnesium ammonium phosphate (MAP) chemical precipitation method, ammonia stripping etc., but aforesaid method all be difficult to accomplish disposable with wastewater treatment to wastewater discharge standard, even reach emission standard, processing cost is also higher, but now the method that usually adopts be adopt earlier pre-treatment such as ammonia stripping with the near biochemical treatment scope of ammonia nitrogen in waste water concentration (≤200mg/L), realize discharged wastewater met the national standard by biochemical treatment then.Biochemical processing is comparatively ripe at present, effluent quality is more stable, but this method needs in the waste water carbon source that biological growth can be provided is arranged, few to organic content, the waste water of biodegradability difference is difficult to use, and harsh to the influent quality conditional request, is unfavorable for the biological self reproducing growth as higher salinity, need suitable temperature, pH etc., so biochemical processing exists many restricted conditions; Simultaneously to handle floor space big for biochemical process, invests higher and the wastewater treatment cycle is longer.

Breakpoint chlorination is a kind of treatment technology at low-concentration ammonia-nitrogen waste water, be mainly used in drinking water disinfection, its ultimate principle is: a certain amount of chlorine or clorox are put in the waste water, when input amount reaches certain when a bit, cl content is lower in the waste water, and ammonia nitrogen goes to zero; Free cl content rising in the water when continuing to add chlorine above this.Breakpoint chlorination has and not disturbed by salts contg, the few more ammonia nitrogen treatment effect of organic content is good more, do not produce mud, the processing efficiency advantages of higher, also rarely found its application in the Industrial Wastewater Treatment at present, and adopt uncovered pond formula to handle more, cause chlorine to overflow, also residual a large amount of chlorine residue in the waste water, the device that adopts break point chlorination to handle ammonia nitrogen waste water specially yet there are no application report.

Summary of the invention

The purpose of this utility model provides a kind of ammonia nitrogen waste water device of the difficult biochemical treatment of processing that can be rapidly and efficiently, high-concentration ammonia nitrogenous wastewater is handled through this device after pre-treatment reduces concentration again can realize once being removed to emission standard, and do not contain chlorine residue, can not cause chlorine to overflow.

Difficult biochemical treatment ammonia nitrogen waste water treatment unit of the present utility model is characterized in that the oxidizing reaction jar is positioned on the reduction reaction can by stent support, and the oxidizing reaction jar links to each other with the pipe connecting of reduction reaction can by the band valve; The oxidizing reaction tank top has agitator, pH meter, oxidant inlet, pH regulator agent to add inlet, waterwater entrance, the bottom is provided with inlet pipe and coupled aerator, contains a spot of chlorine in the gas that produces in jar and absorbs by the chlorine absorption unit and be stored in the conservation tank; The reduction tank top is provided with agitator and reductive agent inlet, and wastewater outlet is arranged at the bottom.

Ammonia nitrogen waste water treatment unit of the present utility model, its oxidizing reaction jar is identical with volume with the reduction reaction can size, and used material is carbon steel, stainless steel, clad steel plate etc., inside lining anti-corrosive glass.

Ammonia nitrogen waste water treatment unit of the present utility model, its oxidizing reaction pot bottom is covered with aerator, and question response finishes the back makes chlorine residue and generation in the waste water by the blower fan air-blowing gas blow-out.Having small amounts of chlorine during oxidizing reaction jar internal reaction overflows with generated reactive gas, the chlorine of overflowing absorbs by the chlorine absorption unit and is stored in the conservation tank, overflow owing to also have small amounts of chlorine in the conservation tank, an alkali lye tourie is being set in case chlorine causes secondary environmental pollution thereafter.

Ammonia nitrogen waste water treatment unit of the present utility model can be used for the processing of various concentration ammonia nitrogen waste waters, but mainly be applicable to lower concentration (≤200mg/L), organism is few, the ammonia nitrogen waste water of difficult biochemical treatment is handled.

Principle of work of the present utility model is: a certain amount of chlorine or clorox are put in the waste water, and when input amount reaches certain when a bit, cl content is lower in the waste water, and ammonia nitrogen goes to zero; Free cl content rises in the water when continuing to add chlorine above this.Chlorine or clorox and water reaction generate HOCl, the NH in HOCl and the water ₄ ⁺Reaction below main the generation:

NH ₄ ⁺+HOCl→NH ₂Cl+H ₂O+H ⁺

NH ₂Cl+HOCl→NHCl ₂+H ₂O

NH ₂Cl+2HOCl→NCl ₃+2H ₂O

NH ₄ ⁺+4HOCl→HNO ₃+5H ⁺+4Cl ^-+H ₂O

NH ₂Cl+0.5HOCl→0.5N ₂+0.5H ₂O+1.5H ⁺+4Cl ^-

Net reaction is: NH ₄ ⁺+ 1.5HOCl → 0.5N ₂↑+2.5H ₂O+2.5H ⁺+ 1.5Cl ^-

The beneficial effects of the utility model are: plant area is few, simple to operate, operation is convenient, safety, stable, is not subjected to weather influence, can not cause chlorine to reveal pollutes, wastewater treatment speed is exceedingly fast, and less device just can be competent at wastewater treatment in enormous quantities, and plant investment is few, processing cost is low, and handle back water outlet ammonia nitrogen concentration less than 2mg/L, total nitrogen does not contain chlorine residue less than 3mg/L.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present utility model.

The 1-agitator, 2-pH meter, 3-oxidant inlet, the 4-waterwater entrance, 5-oxidizing reaction jar, 6-aerator, the 7-inlet pipe, 8-support, 9-reductive agent inlet, the 10-reduction reaction can, 11-wastewater outlet, 12-pipe connecting, the 13-valve, 14-container for storing liquid, 15-alkali lye tourie, 16-chlorine residue resorber, the 17-pH conditioning agent adds inlet.

Embodiment

As shown in Figure 1, ammonia nitrogen waste water enters in the oxidizing reaction jar [5] from waterwater entrance [4], opens the agitator [1] at oxidizing reaction jar [5] top, presses effective Cl and NH by oxidant inlet [3] then ₄ ⁺The ratio of mass concentration, i.e. Cl/NH ₄ ⁺Be 8: 1～9: 1 adding clorox, adding inlet [17] by the pH regulator agent adds medicament adjusting pH and monitors pH=7 by pH meter [2], stop after question response 15-20 minute stirring, by blower fan by inlet pipe [7] and coupled aerator [6] in a large number in waste water about air-blowing 5-10 minute, containing the chlorine that a spot of chlorine and stripping go out in the gas that jar internal reaction produces absorbs by chlorine resorber [16], and be stored in the conservation tank [14], because conservation tank [14] also may have small amounts of chlorine gas and overflow, be provided with the chlorine that an alkali lye tourie [15] passes through the sodium hydroxide solution absorption effusion of splendid attire in the jar thereafter, open in waste water after valve [13] oxide treatment flows into reduction reaction can [10] under support [8] from pipe connecting [12], open the agitator [1] at reduction reaction can [10] top then, add an amount of reductive agent Na by reductive agent inlet [9] ₂SO ₃Waste water discharges through water outlet [11] behind the stoichiometric number minute.Described aerator is a tube aerator, and described pH meter is the online pH determinator of P53 type that U.S. HACH company produces.

The size of ammonia nitrogen waste water treatment unit of the present utility model can be determined as required, because breakpoint chlorination is swift in response, can finish the processing of one jar of waste water in 30 minutes, makes small device sizes just can be competent at wastewater treatment in enormous quantities like this.

Above-mentioned ammonia nitrogen waste water treatment unit is applied to a Rare Earth Separation factory ammonia nitrogen waste water to be handled, waste water elder generation ammonia nitrogen concentration after the pre-treatment of ammonia stripping is reduced to about 200mg/L, this waste water salinity height, and organism is few, be difficult to biochemical treatment, be applicable to and adopt the utility model device to handle.This device oxidizing reaction jar design volume is 20m ³, waste water designing treatment amount is 800m ³/ d is by effective Cl and NH ₄ ⁺The ratio of mass concentration is to add clorox at 8: 1, regulates pH=7, react after 15 minutes again aeration after 5 minutes Open valve waste water enter reduction reaction can, press effective chlorine residue and Na then ₂SO ₃Mol ratio is 〉=2: 1 adding Na ₂SO ₃, reacting discharging after 5 minutes, ammonia nitrogen concentration is 1.5mg/L in the waste water, and TN is 2.4mg/L, and chlorine residue does not detect, and reaches wastewater discharge standard.

Claims

1, a kind of breakpoint chlorination is handled difficult biochemical treatment ammonia nitrogen waste water device, it is characterized in that the oxidizing reaction jar is positioned on the reduction reaction can by stent support, and the oxidizing reaction jar links to each other with the pipe connecting of reduction reaction can by the band valve; The oxidizing reaction tank top has agitator, pH meter, oxidant inlet, pH regulator agent to add inlet, waterwater entrance, the bottom is provided with inlet pipe and coupled aerator, contains a spot of chlorine in the gas that produces in jar and absorbs by the chlorine absorption unit and be stored in the conservation tank; The reduction tank top is provided with agitator and reductive agent inlet, and wastewater outlet is arranged at the bottom.

2, difficult biochemical treatment ammonia nitrogen waste water treatment unit as claimed in claim 1 is characterized in that: the oxidizing reaction jar is identical with volume with the reduction reaction can size, and used material is carbon steel, stainless steel, clad steel plate etc., inside lining anti-corrosive glass.

3, difficult as claimed in claim 1 or 2 biochemical treatment ammonia nitrogen waste water treatment unit, it is characterized in that: the oxidizing reaction pot bottom is covered with inlet pipe and aerator.

4, difficult biochemical treatment ammonia nitrogen waste water treatment unit as claimed in claim 1, it is characterized in that: the small amounts of chlorine of overflowing in the oxidizing reaction jar absorbs by connected chlorine absorption unit and is stored in the conservation tank, and conservation tank is connected with an alkali lye tourie thereafter.