CN201250135Y

CN201250135Y - Disposing device capable of efficiently removing the ammonia nitrogen in ammonia-nitrogen wastewater

Info

Publication number: CN201250135Y
Application number: CNU200820045336XU
Authority: CN
Inventors: 黄海明; 肖贤明; 晏波
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: 2009-06-03
Anticipated expiration: 2018-03-25

Abstract

The utility model relates to a disposing device capable of efficiently removing the ammonia nitrogen in ammonia-nitrogen wastewater, which is an environmental protection and control device capable of recycling ammonia nitrogen remover (magnesium salt or phosphate) and recovering ammonia water for production. The disposing device has the following characteristics: the disposing device has a framework structure and is designed into three layers; wherein, a reaction tank and a filter press are arranged at the upper layer; a pyrolysis chamber and an ammonia absorption chamber are arranged at the middle layer; a filter-pressing solid inlet pipe located on the top of the pyrolysis chamber is connected with the upper-layer filter press; the decomposed solid is conveyed into lower-layer units through a pipeline; a dissolving tank and a solution storage tank connected with the dissolving tank are arranged at the lower layer; and by means of a sludge pump, the solution in the solution storage tank enters into the reaction tank from an ammonia nitrogen remover-feeding inlet in order to be recycled. The disposing device occupies little area, can be conveniently operated, requires little investment, can be flexibly designed according to the quantity of wastewater and has a good wastewater-disposing effect; the ammonia nitrogen-removing rate can reach more than 95 percent; the disposal cost is low; the reaction is quick; and moreover, the disposing device cannot be affected by climatic conditions, cannot cause the secondary ammonia pollution problem and can dispose the wastewater on a large scale in a short time.

Description

The efficient removal of ammonia and nitrogen treatment of ammonia nitrogen in wastewater of a kind of energy device

Affiliated technical field

The utility model relates to a kind of treatment unit that can efficiently handle ammonia nitrogen in the ammonia nitrogen waste water.

Background technology

The a large amount of high-concentration ammonia nitrogenous wastewaters of the common discharging of industries such as metallurgy, chemical industry, pharmacy, food (〉=500mg/L).Ammonia nitrogen waste water is a kind of more unmanageable trade effluent, especially as the waste water of industries such as metallurgy, chemical industry dischargings, and the ammonia nitrogen concentration height, organic content is few, and wastewater biodegradability is poor, even ammonia nitrogen concentration is reduced to very low, also is difficult to realize biochemical treatment.At present mainly adopt the ammonia stripping at the processing of such waste water, this facture is subjected to many factor affecting, as design of water body stripping temperature, vapour-liquid ratio, wastewater pH and stripping tower etc., ammonia nitrogen removal frank is usually in 50%-90% scope, investment cost and processing cost are higher, and the ammonia behind the stripping causes secondary pollution etc. easily.Chemical precipitation method (magnesium ammonium phosphate sediment method) is the more a kind of ammonia nitrogen removal method of Recent study, ammonia nitrogen there is extraordinary removal effect (greater than 90%), technology is simple, be not subjected to temperature limitation, removal for ammonia nitrogen in the waste water of can't the applying biological method handling, this method can play good effect, but because ammonia nitrogen removal agent (magnesium salts, phosphoric acid salt) cost height, its high expense of processing for high-concentration ammonia nitrogenous wastewater causes this method to be difficult to real practicality, though the magnesium ammonium phosphate that reclaims can be used as chemical fertilizer, but not practical application in the agriculture production now, how it is pushed that market is extensive uses and purifying is prepared into that can to sell product be present urgent problem, magnesium ammonium phosphate commercialization research at present and recycle thereof have become new research focus, because processing cost problem, the magnesium ammonium phosphate sediment method does not obtain large-scale practical application so far, can realize the magnesium ammonium phosphate recycle and can reclaim the complete device of ammoniacal liquor reuse and not see appearance as yet.

Summary of the invention

The purpose of this utility model is to overcome the deficiency of above-mentioned magnesium ammonium phosphate sediment method, provide a kind of can realize ammonia nitrogen removal agent recycle, greatly reduce processing cost, can efficiently remove in the high-concentration ammonia nitrogenous wastewater ammonia nitrogen and reclaim the device that ammoniacal liquor is back to production.

The technical solution of the utility model: the efficient removal of ammonia and nitrogen treatment of ammonia nitrogen in wastewater of a kind of energy device is characterized in that this device is skeleton construction, divide three layers of design, the upper strata is provided with retort, the retort top has agitator, pH regulator agent to add inlet, the ammonia nitrogen removal agent adds inlet, pH meter probe, water-in, the lower end is provided with water outlet, tank base is a cone, is provided with sludge outlet, and the sludge outlet pipe links to each other with pressure filter on placing bracing or strutting arrangement; The middle level is provided with thermal degradation chamber and ammonia absorption chamber, and thermal degradation chamber top press filtration solid inlet pipe links to each other with pressure filter, and gas is by the absorption of off-gas pump suction ammonia absorption chamber after decomposing in the thermal degradation chamber for the press filtration solid, and solid imports bed device down into through pipeline after decomposing; There are dissolving vessel and coupled container for storing liquid in lower floor, and the lysate in the container for storing liquid adds inlet by sludge pump from the ammonia nitrogen removal agent and enters retort realization recycle.

Its retort aspect ratio of device of the present utility model H:D=0.7～2:1, the bottom cone height is according to the water yield and ammonia nitrogen concentration and flexible design, the material of retort can be carbon steel, stainless steel, clad steel plate or carbon steel line with rubber etc., and support and support platform are steel or reinforced concrete structure.

Ammonia nitrogen handling arrangement of the present utility model, its sludge outlet links to each other with the pressure filter of lower end, and mud relies on gravity to import the thermal degradation chamber into by pipeline after dewatering.One agitator is arranged at top, thermal degradation chamber, can make heat solid be heated evenly and help simultaneously the effusion of ammonia by the stirring that does not stop, so that magnesium ammonium phosphate can decompose in the fixed temperature range, the ammonia of generation enters the ammonia absorption chamber by suction opening by thermostatically heating chamber thermostatically heating in the outside.

The utility model is provided with degradation production dissolving chamber in lower floor, owing to can produce by product such as Mg (OH) in the decomposition course ₂, Mg ₃(PO ₄) ₂Deng, by in the dissolving chamber, adding appropriate hydrochloric acid dissolving degradation production, being provided with a conservation tank simultaneously in lower floor, denitrfying agent carries out following batch of wastewater treatment in the conservation tank so that the new magnesium ammonium phosphate that produces when decomposing, can utilize, and accelerates the processing cycle.

Principle of work of the present utility model is: waste water is entered in the jar by retort top water-in, denitrfying agent is squeezed in the retort by pump, starting agitator and adding medicament adjusting pH by pH regulator agent dosing pump is 9, reacted 20 minutes, leave standstill then about 1 hour, the magnesium ammonium phosphate that produces will be sink to the awl end, and supernatant liquor is discharged by water outlet.The main reaction that takes place of this step:

Mg ²⁺+NH ₄ ⁺+PO ₄ ^3-+6H ₂O＝MgNH ₄PO ₄·6H ₂O↓

The magnesium ammonium phosphate sediment that produces enters decomposition chamber behind filter-press dehydration, the alkali lye by the decomposition chamber top adds inlet and adds an amount of NaOH solution, 90 ℃ of-100 ℃ of following thermal degradation about 2 hours, and the main reaction that takes place of this step:

MgNH ₄PO ₄+NaOH→MgNaPO ₄+NH ₃↑+H ₂O

After entering dissolving vessel, product after decomposing, goes to then in the conservation tank in order to recycle by adding the appropriate hydrochloric acid dissolving.In said process, in the waste water ammonia nitrogen by with Mg ²⁺, PO ₄ ^3-Generate magnesium ammonium phosphate and be fixed, be removed with precipitated crystal, this process reaction is rapid, and the magnesium ammonium phosphate sediment crystallization of generation is fast, the clearance height.Product after the decomposition discharges Mg once more after dissolving ²⁺, PO ₄ ^3-And the realization recycle.

The beneficial effects of the utility model: concentration is that 2000-4000mg/L high-concentration ammonia nitrogenous wastewater water outlet ammonia nitrogen concentration after the utility model device is handled can be reduced to below the 100mg/L, clearance reaches more than 95%, both can keep and stablized the ammonia nitrogen removal effect by suitably replenishing a small amount of magnesium salts and phosphoric acid salt in the denitrfying agent recycle process, when simultaneously processing cost can be reduced to magnesium ammonium phosphate without recycle below 1/10, under same concentrations, adopt ammonia stripping processing cost low slightly; This utility model ammonia nitrogen removal device is simple to operate, running maintenance is convenient stable, less investment, save space, and can be according to actual waste water amount flexible design size, the ammonia that produces after decomposing can fully be absorbed, and does not cause secondary pollution to environment, the ammoniacal liquor that obtains can be used as product and is back to production, has realized that really the recovery of wastewater treatment and resource combines.

Description of drawings

Fig. 1 is the utility model structural representation

Fig. 2 is a thermal degradation cell structure synoptic diagram

Fig. 3 is an ammonia absorption chamber structural representation

Embodiment

In Fig. 1, ammonia nitrogen waste water enters in the jar from retort 3 top water-ins 10, the sludge pump 19 of opening to a certain amount of back to be added pumps into jar with the lysate in the conservation tank 18, start agitator 1, add inlet 9 by pH regulator agent dosing pump 15 by the pH regulator agent and add medicament adjusting pH, the pH meter 11 continuous monitoring wastewater pH of popping one's head in reach signal pH meter 16 then to regulate pH to set(ting)value, leave standstill after reaction for some time, the complete post precipitation supernatant liquor of product to be generated is emitted by water outlet 4, the precipitated crystal thing relies on gravity to enter pressure filter 13 filter-press dehydrations by sludge outlet 12, solid after pressing dry relies on gravity to reach in the decomposition jar 24 of thermal degradation chamber 14 from press filtration solid inlet 21 by pipeline, add inlet 22 from alkali lye then and add a certain proportion of sodium hydroxide, turn on agitator 20 and constent temperature heater 25, the ammonia that produces is evacuated to tourie 31 in the ammonia absorption chamber 7 through off-gas pump 8, because ammonia is soluble in water, be provided with anti-suck safety can 27 in the tourie upper end, the ammonia that part does not absorb fully in the tourie reaches ammonia absorber 29 and further absorbs deposit in storage ammonia jar 32, and storage ammonia jar 32 upper ends are provided with ammonia excretion mouth 30.Solid product after the decomposition relies on gravity to reach dissolving vessel 17 adding appropriate hydrochloric acid dissolving degradation productions, then in the transposition container for storing liquid 18, it mainly is that the denitrfying agent that enables two cover equivalent is handled waste water in turn that container for storing liquid 18 is set, to improve the wastewater treatment cycle to greatest extent.Pressure filter is a belt filter press in the ammonia nitrogen waste water treatment unit of the present utility model, its big I is selected to be provided with according to producing sludge quantity, the online pH monitor that pH meter adopts Hangzhou Ke Lier environmental protection science and technology Engineering Co., Ltd to produce, model is Jenco3679N, other equipment are according to practical situation processing or select suitable product for use, support platform 6 in the above-mentioned device is reinforced concrete or structure of steel product, there are stair to connect between each layer, can be for personnel's operation of walking about up and down, the support 28 in the ammonia absorption chamber 7 is the steel skeleton construction.

Above-mentioned ammonia nitrogen waste water treatment unit is applied to a Rare Earth Separation factory ammonia nitrogen in high density washes (1500mg/L) handles this device reaction jar aspect ratio 1.5:1, designing treatment water yield 30m ³/ h presses Mg ²⁺: NH ₄ ⁺: PO ₄ ^3-=1.2:1:1 adds denitrfying agent, because denitrfying agent has small loss in handling, therefore needs in time to add an amount of medicament and replenish to keep this ratio in the recycle process, presses NH in the magnesium ammonium phosphate decomposition course ₄ ⁺: OH ^-=1:1～1.1 add sodium hydroxide and decompose, degradation production dissolves with appropriate hydrochloric acid, after waste water is handled in recycle, the water outlet ammonia nitrogen is reduced to below the 70mg/L, ammonia nitrogen removal frank reaches more than 95%, greatly reduce ammonia nitrogen in waste water concentration, and make ammonia nitrogen obtain reclaiming and returning production and utilize once more with the ammoniacal liquor form.

Claims

1, the efficient removal of ammonia and nitrogen treatment of ammonia nitrogen in wastewater of a kind of energy device, it is characterized in that: it is skeleton construction, divide three layers of design, the upper strata is provided with retort, the retort top has agitator, pH regulator agent to add inlet, the ammonia nitrogen removal agent adds inlet, pH meter probe, water-in, and the lower end is provided with water outlet, and tank base is a cone, be provided with sludge outlet, the sludge outlet pipe links to each other with pressure filter on placing brace table; The middle level is provided with thermal degradation chamber and ammonia absorption chamber, and thermal degradation chamber top press filtration solid inlet pipe links to each other with pressure filter, and gas is by the absorption of off-gas pump suction ammonia absorption chamber after decomposing in the thermal degradation chamber for the press filtration solid, and the decomposition after product imports bed device down into through pipeline; There are dissolving vessel and coupled container for storing liquid in lower floor, and the lysate in the container for storing liquid adds inlet by sludge pump from the ammonia nitrogen removal agent and enters retort realization recycle.

2, ammonia nitrogen waste water treatment unit according to claim 1, it is characterized in that: the outdoor layer of thermal degradation is constant temperature heating device, inside is provided with decomposes jar, and decomposing the tank top has an agitator and be provided with press filtration solid inlet pipe, alkali liquor inlet pipe, ammonia outlet pipe simultaneously.

3, ammonia nitrogen waste water treatment unit according to claim 1, it is characterized in that: the ammonia absorption chamber is made up of tourie, anti-suck safety can, ammonia absorber, storage ammonia jar, do not absorb completely ammonia in the tourie and absorb through ammonia absorber and be stored in storage ammonia jar, storage ammonia tank top is provided with an ammonia excretion mouth.

4, ammonia nitrogen waste water treatment unit according to claim 1, its feature is as for retort aspect ratio H: D=0.7～2: 1, the bottom cone height is according to the water yield and ammonia nitrogen concentration and flexible design, the material of retort can be carbon steel, stainless steel, clad steel plate or carbon steel line with rubber etc., and support and support platform are steel or reinforced concrete structure.