CN105923832A

CN105923832A - Make-up water treatment method, system and application for circulating water

Info

Publication number: CN105923832A
Application number: CN201610422957.4A
Authority: CN
Inventors: 汪洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-06-15
Filing date: 2016-06-15
Publication date: 2016-09-07

Abstract

The invention discloses a make-up water treatment method for circulating water. The make-up water treatment method includes the steps: (1) adjusting the pH (potential of hydrogen) value of used raw make-up water; (2) removing suspended matters and total dissolved solid matters in the raw water by a physic-chemical method; (3) adjusting ammonia-nitrogen indexes of the raw water by a physical method, the physic-chemical method or a biological method; (4) adjusting the iron content of the raw water by an oxidation method or the biological method; (5) adjusting the hardness of recycled water by a water softening method. The turbidity of the raw water is smaller than or equal to 10NTU, and electric conductivity of the raw water is smaller than or equal to 600MuS/cm. The iron content of the raw water is smaller than or equal to 0.3mg/L. The hardness of the recycled water is smaller than or equal to 120mg/L. The invention further discloses a make-up water treatment system implementing the method for the circulating water, and an application of the make-up water treatment system to central air-conditioning circulating water system. By the method, the raw make-up water is treated to meet the water quality requirement of make-up water for the circulating water, the recycled water is sufficiently used, and waste of water resources is avoided.

Description

A kind of supplementary method for treating water, system and application for recirculated water

Technical field

The present invention relates to water treatment technical field, particularly relate to a kind of supplementary water for recirculated water Processing method, system and application.

Background technology

China's water resource is not enriched, and is one of Ge Pin land that abounds in rivers and lakes of the world 13, and average annual precipitation only has 630mm, Less than the precipitation (880mm) of Global land area, average water total resources is 2.81 trillion m³, occupy The 6th, the world, but the per capita water yield only 2251m³, it is 1/4th of world average level, occupies National the 110th in 149, the world.As can be seen here, China belongs to the country of shortage of water resources.Entirely In 666 cities of state, having nearly 400 hydropenias, hydropenia causes water rate to go up, such as city of Weihai in Shandong province, Urbanite now presses 2.0m³/ the moon, quota supplied water, and overage presses 40 yuan/m³Charge.Therefore, the whole nation It is inevitable trend that major part urbanite's use water water rate goes up.

On the one hand water resource critical shortage, on the other hand water resource pollution is day by day serious, and nineteen ninety-five is national Wastewater discharge reaches 365.2 hundred million m³, account for the 9% of world's total amount of sewage discharge, cause the whole nation more than 700 bars Big-and-middle river is affected, and nearly 1/2 is polluted, and wherein more than 70 bar rivers lose because of seriously polluted Use value, the urban groundwater of 50% is contaminated, and therefore water resource pollution is the most serious.

Along with China's Urbanization Construction and the needs of industrial development, heating air-conditioner recirculated water and industrial cycle The water yield of the supplementary water of water accounts for the water yield for building and more than the 50% of industrial process waters amount.Along with China The enforcement of water-saving policy, heating air-conditioner and industrial circulating water make-up water source from traditional municipal administration from the beginning Water the most progressively turns to the recycled waters such as draining and the architectural intermediate water of surface water, subsoil water or sewage treatment plant to make For water source.And the water quality of surface water, subsoil water and recycled water all can not meet the water of practical application area Matter requirement.As promoted more universal middle water at present as heating air-conditioner recirculated cooling water moisturizing, its water Matter is analyzed as follows:

With reference to national standard " architectural intermediate water design specification " (GB50336 2002) design influent quality, Such as table 1.

Water design specification data in the different purposes of table 1

Effluent quality is designed with reference to national standard " heating and air-conditioning system water quality " GB/T29044-2012, Such as table 2.

Table 2 central air conditioning indirect cooling open cycle cooling water system recirculated water and supplementary water water quality requirement

According to Tables 1 and 2, Jiang Zhongshui directly applies to central air conditioning indirect cooling open circulation The supplementary water of cooling water system, it is impossible to meet the requirements, then need to carry out each index item of middle water used Detection, when the water quality of middle water used exceedes this standard, need to make corresponding water treatment to it.

The present invention is exactly on this basis, and the former water being applied to circulation and supplementing water is carried out water quality The method and system processed so that it is application standard can be reached.Energy-conservation, water saving height for circulation Effect stable operation provides technical guarantee.For the technical support that the deep exploitation offer of recycled water is feasible.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of supplementary method for treating water for recirculated water, Make it after processing, meet circulation and supplement the requirement of water, it is achieved the process reducing circulation is born Lotus, promotes that energy-conservation, the water saving of circulation run.

For solving above-mentioned technical problem, the present invention provides a kind of supplementary method for treating water for recirculated water, Described method comprises the following steps that

(1) pH value regulation uses chemical method to be adjusted to meet institute by the former water pH value of described supplementary water State the pH indication range of supplementary water, and meet the subsequent processing steps scope to pH value requirement；

(2) turbidity and electrical conductivity process the float using physico-chemical process to remove in the described former water of supplementary water With total dissolubility solid content so that it is turbidity is less than or equal to 10NTU, electrical conductivity is less than or equal to 600 μ S/cm, Meet described supplementary water to water turbidity and the requirement of electrical conductivity；

(3) NH_3-N treating uses Physical, physico-chemical process or the bioanalysis ammonia to the described former water of supplementary water Nitrogen processes so that it is ammonia nitrogen index is less than or equal to 5mg/L, meets described supplementary water and refers to Water quality ammonia nitrogen Target requirement；

(4) water that removing of iron and manganese exceeds standard for iron ion content in the described former water of supplementary water, uses oxygen Change method or bioanalysis carry out removing of iron and manganese process to the described former water of supplementary water so that it is iron manganese content meets described Supplement the water requirement to water quality ferrimanganic index；

(5) hardness processes and uses chemical method to be adjusted the described former hardness of water of supplementary water, makes Its hardness meets the requirement to water hardness index of the described supplementary water.

As a modification of the present invention, also include before described step (2) using physical filtering method to go Except the step of float in the described former water of supplementary water；Described method also includes described step (1) to (5) The step of the supplementary self-cleaning protection of water water quality after process.

Improving further, the pH adjusting agent used in described step (1) includes alkaline solution and acidity Solution, described alkaline solution includes sodium bicarbonate solution, sodium carbonate liquor, sodium hydroxide solution or oxygen Changing calcium solution, described acid solution includes sulphuric acid or hydrochloric acid solution.

Improving further, in described step (2), physico-chemical process is coagulation and filtration method, and this coagulation and filtration method is adopted The compositions that flocculant is polymer alumina or polymer alumina and polyacrylamide.

Improving further, in described step (3), Physical is membrane separation technique, physico-chemical process be blow-off method, Break point chlorination, zeolite deamination method or the MAP sedimentation method.

Improving further, in described step (4), oxidizing process is autoxidation process or contact oxidation method, makes Its iron content is less than or equal to 0.3mg/L.

Improve further, described step (5) uses water softening device described supplementary water is carried out water quality Sofening treatment so that it is hardness is less than or equal to 120mg/L.

The present invention also provides at a kind of supplementary water for recirculated water realizing above-mentioned supplementary method for treating water Reason system, the described supplementary water treatment system for recirculated water includes passing sequentially through described in pipeline communication Supplement water former water regulating reservoir, pH regulator device, pH detection device, flocculant adding apparatus, flocculation anti- Answer device, precise filtering device, ammonia nitrogen handling arrangement, removing of iron and manganese device, water softening device and clear water reserviors.

Improve further, described supplementary water treatment system also include the water tank that is connected with described clear water reserviors from Clean device.

It addition, the present invention also provides for a kind of supplementary water treatment system for central air conditioning circulation, This supplementary water treatment system being used for central air conditioning circulation includes the above-mentioned benefit for recirculated water Water-filling processing system.

Using above-mentioned technical scheme, the present invention at least has the advantage that

1, the present invention is by using pH regulator method, coagulation and filtration method, NH_3-N treating method, removing of iron and manganese side The supplementary water of recirculated water is processed by method and softening method for treating water so that it is can meet national standard and want The central air conditioning circulation asked supplements the water quality requirement of water, especially realizes the abundant profit to recycled water With, it is to avoid the waste of water resource, it is provided that technical guarantee reliably and process route.

2, according to the water quality index of benefit water filling source, under conditions of ensureing main process order, rationally Selection process section is combined, and the processing section of item up to standard for raw water quality can be cancelled or in the process phase Between use bypass mode to enter directly into next to process process section, reduce and run and processing cost.Can To realize adapting to the water that the supplementary water of recirculated water is different under conditions of minimum cost of investment with operating cost Source, such as subsoil water, surface water, recycled water etc., strong adaptability.

3, whole processing method combines with Physical and physico-chemical process, can realize fully automatic operation, operation Simply, operation maintenance is convenient.

Accompanying drawing explanation

Above-mentioned is only the general introduction of technical solution of the present invention, in order to better understand the technology of the present invention Means, below in conjunction with accompanying drawing, the present invention is described in further detail with detailed description of the invention.Supplement Water in the former hydromining of water, the water after process supplements water for central air conditioning open type recirculated cooling water.

Fig. 1 is the present invention schematic flow sheet for the supplementary method for treating water of recirculated water.

Fig. 2 is the present invention structural representation for the supplementary water treatment system of recirculated water.

Detailed description of the invention

According to background technology introduction, it is cold that Jiang Zhongshui directly applies to central air conditioning indirect cooling open circulation But the supplementary water of water system, it is impossible to meet the requirements, then need middle water used is carried out water treatment, make It meets central air conditioning open cycle cooling water system and supplements the requirement of water water standard.The present embodiment is As a example by the supplementary method for treating water being applied to central air conditioning indirect cooling open cycle cooling water system, Wherein water in the former hydromining supplementing water used, should not be understood as any limitation of the invention, its It is specifically described as follows.

Referring to the drawings shown in 1, the present invention comprises the steps: for the supplementary method for treating water of recirculated water

1, pH regulator

In used, the pH value of water (i.e. supplementing the former water of water) is 6.0～9.0, and central air conditioning circulating cooling Water supplements the pH value of water requires to be 6.5～9.5, if because the pH value of cooling water is the lowest, it is right to accelerate The corrosion of central air conditioning cooling recirculation system, if the pH value of cooling water is the highest on the contrary, can accelerate to collect hollow Adjust the recirculated water fouling of cooling recirculation system, reduce heat exchange efficiency, therefore need for recirculated cooling water The middle water pH value supplementing water carries out on-line monitoring and regulation control, so that the pH value of middle water used meets Requirement.In the present embodiment, pH adjusting agent includes alkaline solution and acid solution, and this alkaline solution includes carbon Acid hydrogen sodium solution, sodium carbonate liquor, sodium hydroxide solution or calcium oxide solution etc., described acid solution Including sulphuric acid or hydrochloric acid solution etc..

2, total dissolubility solid content and turbidity process

In used, water turbidity is 20NTU, and total dissolubility solid content is 1500mg/L, and central air conditioning circulation The turbidity of the supplementary water of water requires to be 10NTU, therefore needs the middle water turbidity to the supplementary water for recirculated water Process.Polymer alumina (PAC) or PAC is added with poly-in pH adjusted middle water up to standard The compositions of acrylamide (PAM), makes medicine be diffused into rapidly and uniformly in water so that it is hydrolysis is produced Thing is fully contacted with the colloidal particles in former water, and it is bigger that the suspended solid making granule small is condensed into granule Floccule body, filtered by disc filter or more medium filter and separate.Thus realize middle water Turbidity index processes below 10NTU, and total dissolved solid TDS index is reduced to below 1000mg/L. When in the present embodiment, the compositions of employing PAC Yu PAM is flocculant, this PAC and PAM adds matter Amount concentration is respectively 300mg/L and 15mg/L.

3, electrical conductivity regulation

Owing to electrical conductivity is relevant to total dissolubility solid content, it is possible to by controlling total dissolubility solid Thing regulates electrical conductivity.

In used, total dissolved solid of water is 1500mg/l, according to formula (1):

Total dissolved solid=0.6 of electrical conductivity ÷ (1)

Available middle electrical conductivity of water used is 900 μ S/cm, and the supplementary water of central air conditioning recirculated water Electrical conductivity require should≤600 μ S/cm.Therefore need total dissolubility solid content of middle water used is adjusted Joint, so that its electrical conductivity meets the requirements.TDS index is reduced to by the present embodiment by step (2) Below 1000mg/l, thus indirectly realize supplementary electrical conductivity of water is dropped to 600 below μ S/cm.

4, ammonia nitrogen regulation

In used, the ammonia nitrogen index of water is 20mg/L, and central air conditioning recirculated cooling water supplements the ammonia nitrogen of water Index request is 5mg/L.Because if ammonia nitrogen enters recirculating cooling water system, particularly more slow at flow velocity In slow cooling tower and condenser, easily cause algae and the amount reproduction of other microorganisms in water, produce Biological sludge in industrial, causes compound scale, has a strong impact on heat exchange efficiency；And ammonia nitrogen also makes water disinfection and work Industry circulating water sterilizing processing procedure increases chlorine dosage；Also to some metal, particularly to condenser copper Pipe has corrosivity；If so middle Water Sproading used being used for central air conditioning recirculated cooling water when supplementing water, The ammonia nitrogen of middle water used need to be adjusted, so that its index meets the requirements.

In the present embodiment, the minimizing technology of ammonia nitrogen can use the membrane separation technique of pure physical treatment, at materialization The blow-off method of reason, break point chlorination, zeolite deamination method, the MAP sedimentation method, and biological denitrificaion method etc..

Wherein, membrane separation technique: utilize the selective penetrated property of film to carry out a kind of method of ammonia nitrogen removal. This method is easy to operate, and the ammonia nitrogen response rate is high, non-secondary pollution.Such as: gas-water separation film removes Ammonia nitrogen.Ammonia nitrogen also exists ionic dissociation equilibrium in water, and along with PH raises, ammonia is NH in water₃Form ratio Raise, under uniform temperature and pressure, NH₃Gaseous state and liquid two reach balance.Put down according to chemistry Weighing apparatus movement principle i.e. Lu. look into Delhi (A.L.LE Chatelier) principle, in nature all Balance is all relative and temporary transient.Chemical equilibrium simply could keep under certain condition " if changing Flatten one of condition of balance system, and such as concentration, pressure or temperature, balance is just to weakening this change Direction move." defer to this principle to have carried out following design concept in the side of film being high strength ammonia Nitrogen waste water, opposite side is acidic aqueous solution or water.When left side temperature T1 > 20 DEG C, PH1 > 9, P1 > P2 protects Hold certain pressure differential, then the free ammonia NH in waste water⁴⁺, just become amino molecule NH₃, and through material liquid Side interface diffuses to film surface, under the effect of film surface difference of partial pressure, passes through fenestra, enters absorbing liquid, H rapidly and in acid solution⁺Reaction generates ammonium salt.

Blow-off method: in the basic conditions, utilizes the gas-liquid between the phase concentrations of ammonia nitrogen and liquid concentration Equilibrium relation carries out a kind of method separated, and stripping efficiency and temperature, PH, gas liquid ratio are relevant.

Break point chlorination is: is passed through in middle water by chlorine and reaches certain point, free chlorine contents in water when this Relatively low, and the concentration of ammonia reduces to zero.When chlorine intake exceedes this, the free chlorine in water will increase, This point is referred to as break.Chlorination under this state is referred to as breakpoint chlorination.This break point chlorination is except the mechanism of ammonia Reacting for chlorine and ammonia and generate harmless nitrogen, its chlorination ratio is 8:l～10:1.When ammonia nitrogen concentration is little When 20mg/L, denitrification percent is more than 90%, and the pH value of middle water is relatively big, during pH value height on its impact Produce NO^3-, when pH value is low, produce NCl₃, the consumption of chlorine will be strengthened, generally control the pH of middle water used Value is between 6～8.This break point chlorination denitrification percent is high, equipment investment is few, it is complete to be swift in response, and There is the effect of sterilization.

Zeolite deamination method: utilize the cation in zeolite to swap to reach denitrogenation with the NH4+ in waste water Purpose.Application zeolite deamination method must take into the regeneration issues of zeolite, generally has regenerated liquid method and burns Burning method.When using burning method, the ammonia of generation must process.

The MAP sedimentation method: mainly by following chemical reaction: Mg²⁺+NH⁴⁺+PO₄ ^3-=MgNH₄PO₄

In the waste water containing ammonia nitrogen in high density, then add microcosmic salt and magnesium salt, when [Mg²⁺][NH⁴⁺][PO₄ ^3-]>2.5×10^-13Time can generate ammoniomagnesium phosphate (MAP), remove the ammonia in waste water Nitrogen.

Biological denitrificaion method: have A/O, two sections of activated sludge processes, Strong oxdiative Aerobic biological process, short distances Nitration denitrification, ultrasonic stripping process ammonia nitrogen method method.

Wherein, leading portion anoxia section and back segment aerobic section are cascaded by (1) A/O technique, A section DO It is not more than 0.2mg/L, O section DO=2～4mg/L.Anoxia section heterotrophic bacteria by the starch in sewage, fibre The suspended contaminant such as dimension, carbohydrate and dissolved organic matter are hydrolyzed to organic acid, make macromole have Machine thing is decomposed into small organic molecule, and insoluble Organic substance changes into dissolved organic matter, when these When the product entrance Aerobic Pond of anaerobic hydrolysis carries out Aerobic Process for Treatment, improve the biodegradability of sewage, carry The efficiency of hyperoxia；Anoxia section heterotrophic bacteria, the pollutant such as protein, fat are carried out ammonification (organic chain On N or amino in aminoacid) dissociate ammonia (NH₃、NH⁴⁺), under sufficient oxygen supply condition, from The Nitrification of bacteria is by NH₃-N(NH⁴⁺) it is oxidized to NO^3-, it is back to A pond by backflow control, Under anoxia condition, the Denitrification of heterotrophic bacteria is by NO^3-It is reduced to molecular nitrogen (N₂) complete C, N, O circulation in ecology, it is achieved sewage harmless treatment.Be characterized in anoxic pond front, in sewage Organic carbon is utilized by denitrifying bacterium, can alleviate the organic loading of Aerobic Pond thereafter, and anti-nitration reaction produces Raw basicity can compensate and carry out the nitration reaction demand to basicity in Aerobic Pond.Aerobic anoxic pond it After, the organic pollution that denitrification can be made to remain is removed further, improves effluent quality.BOD5 Clearance higher up to 90～more than 95%, but Nitrogen/Phosphorus Removal is slightly worse, nitric efficiency 70～80%, Dephosphorization only has 20～30%.While it is true, owing to A/O technics comparing is simple, also have its prominent feature.

(2) two sections of effective organics removal of activated sludge process energy and ammonia nitrogen, wherein the second level is in and prolongs Time aeration phase, the time of staying, concentration of wastewater, at below 2g/L, can not be arranged at about 36 hours Mud or few spoil disposal thus reduce Treatment of Sludge expense.

(3) its Typical Representative of Strong oxdiative Aerobic biological process has a Powdered Activated Carbon method (PACT technique): Being mainly characterized by of powder activated carbon method adds Powdered Activated Carbon (PAC) in Aeration tank and utilizes powder to live Property the extremely flourishing microcellular structure of charcoal and bigger absorbability, make dissolved oxygen and nutrient substance at its table Face is enriched with, and provides good living environment for absorption microorganism on PAC thus improves organic Degradation rate.

5, iron manganese content regulation

The metallicity ion indexs such as ferrimanganic are not the most done respective handling by middle water, and central air conditioning circulates Cooling water supplements the content of ferrum in water and answers≤0.3mg/L.In the present embodiment, the effective treating method of ferrum can be adopted With autoxidation process, contact oxidation method and bioanalysis it is processed,.

Wherein, (1) autoxidation process

Autoxidation process deferrization and demanganization is exactly that subsoil water is through overcharging using the oxygen in air as oxidant After the aeration aerating divided, by Fe²⁺It is oxidized to Fe³⁺, and separate out with the form of hydroxide precipitation, then lead to Cross precipitation, filter and removed, except iron oxidation reaction is shown in formula (2):

4Fe²⁺+O₂+2H₂0=4Fe³⁺+OH^- (2)

During autoxidation demanganization, due to Mn²⁺Oxidation-reduction potential higher than Fe²⁺, at pH > 9.0 time, Oxidation rate is the most substantially accelerated, and the pH value of general water is 6.O～7.5, only removes C0 by aeration₂With The conventional method improving pH value is difficult to the pH of water be brought up to more than 9.O, so demanganization must be additionally Add alkali.

(2) contact oxidation method

Water, after aeration, is directly entered filter, along with the lengthening of the time of operation, on filtrate progressively It is coated with by iron and manganese oxides and is formed Fe in subsoil water²⁺、M²⁺Oxidation have autocatalysis " activity Filter membrane ".Contact oxidation method refers to Fe by the catalysed oxidn of active filter film²⁺、Mn²⁺Oxidation Technical process.

(3) bioanalysis

Bioanalysis is i.e. to utilize iron bacteria biological oxidation, good to obtaining the manganese being difficult to aoxidize Removal effect, and step reduction construction investment and the water producing cost that spout.

In filtration, reach to go the purpose of removing of iron and manganese by low intensity aeration simultaneously, and iron bacteria is to ring Border dissolved oxygen (DO), pH tolerance range wider；Bioanalysis can be greatly lowered aeration intensity, reduction Back washing strength and extend filter cycle, thus reduces water producing cost.

6, hardness regulation

It is 900 μ S/cm according to electrical conductivity of water middle used by above-mentioned drawing, further according to formula (3):

1 μ s/cm electrical conductivity=0.5ppm hardness (3)

Can converse middle hardness of water used is 450mg/L, and central air conditioning recirculated cooling water supplements water Hardness requirement is≤120mg/L.Therefore need middle hardness of water used is adjusted.In the present embodiment firmly The effective treating method of degree regulation is for using a kind of hardness adjustable type water demineralization system (patent No. 201520033127.3) it is carried out sofening treatment, according to this patent, this hardness adjustable type water Matter melded system uses cation exchanger or zwitterion mixed bed exchanger to enter middle hardness of water used Row regulation.

7, water quality keeps

Each index of middle water used is processed by above-mentioned steps 1～6 so that it is place after all meeting the requirements In reuse clear water reserviors standby, when stopping in these reuse clear water reserviors, for avoiding water quality deterioration, need to be Arranging water tank self-cleaning device in reuse clear water reserviors, the supplementary water after holding processes meets the requirements.Water tank is certainly Clean device uses jet rich behind magnetic field or ultraviolet lamp disinfection again after being promoted by the water in reuse clear water reserviors The mode of oxygen returns to reuse clear water reserviors, not only acts as and kills the disinfective action supplementing water in reuse clear water reserviors, And field of flow can be formed, it is achieved " operating condition that Running water never becomes putrid " to reuse clear water reserviors oxygenation, from And realize the function that water quality keeps.

In middle water before and after processing above-mentioned steps, each index contrasts, its result such as table 3 below.

The comparing result of each index in water during table 3 present invention is used before and after the supplementary method for treating water of recirculated water

Can be seen that through upper table 3, the present invention for the supplementary method for treating water of recirculated water include pH regulator method, Coagulation and filtration method, break point chlorination, removing of iron and manganese method and softening method for treating water, through above-mentioned processing method Rear middle water used disclosure satisfy that " heating and air-conditioning system water quality " GB/T29044-2012 and " municipal sewage Regeneration urban reclaimed water water standard " GB/T18920-2002 water quality requirement, it is achieved to recycled water Make full use of, it is to avoid the waste of water resource.

Referring to the drawings shown in 2, the present invention supplements the supplementary water for recirculated water used by method for treating water Processing system includes that the regulating reservoir 1 being sequentially communicated, pH regulator device 2, pH detect device 3, flocculant Adding set 4, flocculation reactor 6, precise filtering device 7, break point chlorination device 8, chlorination react Device 9, removing of iron and manganese device 10, water softening device 12 and clear water reserviors 11.

This regulating reservoir 1, is used for depositing middle water used (the supplementary former water of water i.e. used) and at this supplementary water Reason system provides water source.

This pH regulator device 2 matches with pH detection device 3, for realizing the PH to middle water used Value regulation so that it is pH value is 6.5～9.5.

This flocculant adding apparatus 4, for throwing in appropriate flocculant in middle water used；This flocculation is anti- Answering device 6, for making the flocculant of above-mentioned input, total dissolubility solid content reacts with middle water used, Produce precipitation；This precise filtering device 7, for carrying out precision to the precipitation produced in above-mentioned middle water used Filtering, so this flocculant adding apparatus 4, flocculation reactor 6 and precise filtering device 7 matches energy Realize the turbidity in middle water used and electrical conductivity all meets the requirements.

This break point chlorination device 8 and chlorination reactor 9 match, for being passed through chlorine in middle water used Gas, and make this chlorine react with ammonia, reduce the ammonia nitrogen index in middle water used so that it is meet the requirements.

This removing of iron and manganese device 10, is used for removing the metallicity ion such as ferrum, manganese in middle water used so that it is symbol Close the requirement of the supplementary water of recirculated water.

This water softening device 12, uses a kind of hardness adjustable type melded system, be used for reducing used in Hardness of water so that it is meet the supplementary hardness of water requirement of central air conditioning recirculated water.

These clear water reserviors 11, water in storing after the process that the supplementary water meeting recirculated water requires, in case After use.

In order to avoid satisfactory water quality is deteriorated by secondary in clear water reserviors 11, supplementing of this recirculated water Water treatment system also includes the water tank self-cleaning device being connected with these clear water reserviors 11, makes in clear water reserviors 11 Standby supplementary water can persistently keep qualified water.

It addition, the supplementary water treatment system of recirculated water of the present invention is additionally provided with on the connection pipeline of each device Elevator pump 5, for handled supplementary water is carried out pump liquid according to demand, makes the supplementary water of this recirculated water Processing system smoothly completes the process to supplementary water used.

The supplementary water treatment system of recirculated water of the present invention is reasonable in design, saves floor occupying area, and saves and runs Expense, compares tradition MBR biomembrance process, and investment and operating cost are low, simple to operate, is suitable for promoting.

The above, be only presently preferred embodiments of the present invention, and the present invention not makees any form On restriction, those skilled in the art utilize the technology contents of the disclosure above make a little simple modification, Equivalent variations or modification, all fall within protection scope of the present invention.

Claims

1. the supplementary method for treating water for recirculated water, it is characterised in that described method includes step Rapid as follows:

Supplementary method for treating water the most according to claim 1, it is characterised in that described step (2) The most also include using physical filtering method to remove the step of float in the described former water of supplementary water；Described side Method also includes the step of the supplementary self-cleaning protection of water water quality after processing described step (1) to (5).

The supplementary method for treating water of recirculated water the most according to claim 1, it is characterised in that institute State the pH adjusting agent used in step (1) and include alkaline solution and acid solution, described alkaline solution Including sodium bicarbonate solution, sodium carbonate liquor, sodium hydroxide solution or calcium oxide solution, described acidity Solution includes sulphuric acid or hydrochloric acid solution.

The supplementary method for treating water of recirculated water the most according to claim 1, it is characterised in that institute Stating physico-chemical process in step (2) is coagulation and filtration method, and the flocculant that this coagulation and filtration method uses is polymeric oxygen Change the compositions of aluminum or polymer alumina and polyacrylamide.

The supplementary method for treating water of recirculated water the most according to claim 1, it is characterised in that institute Stating Physical in step (3) is membrane separation technique, and physico-chemical process is blow-off method, break point chlorination, zeolite Deamination method or the MAP sedimentation method.

The supplementary method for treating water of recirculated water the most according to claim 1, it is characterised in that institute Stating oxidizing process in step (4) is autoxidation process or contact oxidation method so that it is iron content is less than or equal to 0.3mg/L。

The supplementary method for treating water of recirculated water the most according to claim 1, it is characterised in that institute State and step (5) uses water softening device described supplementary water is carried out water demineralization process so that it is hardness Less than or equal to 120mg/L.

8. one kind realize as described in any one of claim 1 to 7 supplement method for treating water be used for circulate The supplementary water treatment system of water, it is characterised in that the described supplementary water treatment system bag for recirculated water Include pass sequentially through the described supplementary water former water regulating reservoir of pipeline communication, pH regulator device, pH detection device, Flocculant adding apparatus, flocculation reactor, precise filtering device, ammonia nitrogen handling arrangement, removing of iron and manganese fill Put, water softening device and clear water reserviors.

Supplementary water treatment system the most according to claim 8, it is characterised in that described supplementary water Processing system also includes the water tank self-cleaning device being connected with described clear water reserviors.

10. the supplementary water treatment system for central air conditioning circulation, it is characterised in that The described supplementary water treatment system for central air conditioning circulation includes such as claim 8 or 9 institute The supplementary water treatment system for recirculated water stated.