CN106039984B - Sewage plant waste gas cleaning system based on pretreatment and biofilter group technology - Google Patents
Sewage plant waste gas cleaning system based on pretreatment and biofilter group technology Download PDFInfo
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- CN106039984B CN106039984B CN201610586971.8A CN201610586971A CN106039984B CN 106039984 B CN106039984 B CN 106039984B CN 201610586971 A CN201610586971 A CN 201610586971A CN 106039984 B CN106039984 B CN 106039984B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/95—Specific microorganisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/304—Hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/306—Organic sulfur compounds, e.g. mercaptans
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a kind of based on the sewage plant waste gas cleaning system pre-processed with biofilter group technology, including gas sampling and transportation system, pretreatment and biofilter group technology, transportation system purifies the group technology that the exhaust gas of collection is transported to pretreatment and biofilter, cleaning solution spray tube is respectively equipped at the top of pretreatment and biofilter, bottom is respectively equipped with gas distribution system, middle part is respectively equipped with the biological filter bed of material, biofilter left bottom is equipped with the air inlet pipe being connected to pretreating zone, biofilter right hand top is equipped with the escape pipe being connected to biological treatment zone, the ventilation pipe for communicating pretreatment top and biofilter is equipped between pretreatment top and biofilter bottom.The present invention increases in group technology leading portion to be pre-processed, and is recycled using alkali, is improved the pH of exhaust gas, ensured the effect in subsequent biochemical filter tank, dominant bacteria is cultivated in biological treatment, and the pollutant in exhaust gas of targetedly degrading realizes the qualified discharge of exhaust gas.
Description
Technical field
The present invention relates to exhaust-gas treatment, in particular to a kind of sewage plant based on pretreatment and biofilter group technology is useless
Gas purification system.
Background technique
Sewage treatment plant's main process is to adjust section, anaerobism section and aerobic section and Treatment of Sludge section, these techniques
Section generates certain foul gas, and main foul gas is H2S, ammonia, mercaptan, CH4、CO2The air having more than needed with aerobic aeration.
The above structures are sealed, are delivered on waste gas cleaning system after gas sampling, chemistry and biochemical reaction occurs, reaches
To purifying malodorous gas purpose, and make tail gas qualified discharge.
Summary of the invention
Object of the present invention is to: a kind of sewage plant waste gas purification system based on pretreatment and biofilter group technology is provided
System, structure is simple, and purification efficiency is high, and tail gas qualified discharge, power consumption, operating cost is low, and operational administrative is simple.
The technical scheme is that
Sewage plant waste gas cleaning system based on pretreatment and biofilter group technology, including gas sampling and delivery system
The exhaust gas of collection is transported to pretreatment and biofilter combination system by system, pretreatment and biofilter combined system, transportation system
System is purified, and the pretreatment and biofilter combined system include the pretreating zone and biofilter divided side by side, pre- to locate
It is respectively equipped with cleaning solution spray tube at the top of reason area and biofilter, bottom is respectively equipped with gas distribution system, and middle part is respectively equipped with life
Object filter material layer, pretreating zone left bottom are equipped with the air inlet pipe being connected to pretreating zone, and biofilter right hand top is equipped with and life
The escape pipe of object filter tank connection, being equipped between pretreating zone top and biofilter bottom makes pretreating zone and biofilter phase
Logical ventilation pipe.
Preferably, between the pretreating zone and the biological filter bed of material and gas distribution system of biofilter by filler supporting plate every
It opens, the filler supporting plate uses glass fiber reinforced grid-like panel, and for flase floor with a thickness of 25mm, plate body is evenly distributed with several 20*20mm
Through-hole.
Preferably, pretreatment cyclic water tank and biofilter are also separately installed on the outside of the sewage plant waste gas cleaning system
Cyclic water tank；The water inlet of the pretreatment cyclic water tank is the clear liquid of aerobic tank, and circulation fluid is liquid alkaline, and outlet pipe passes through recirculated water
Pump is transported to the cleaning solution spray tube at top, after the filtering of the biological filter bed of material of pretreating zone, pretreating zone bottom water outlet
It is connected with cyclic water tank, pretreatment cyclic water tank is equipped with filter screen, emptying and overflow pipe；The water inlet of the biofilter is preferably
Oxygen pond mud mixture and middle water, outlet pipe is transported to the cleaning solution spray tube at top by water circulating pump, by biofilter
The biological filter bed of material purification after, biofilter bottom water outlet is connected with cyclic water tank, biofilter cyclic water tank set filter screen,
Emptying and overflow pipe.
Preferably, the pretreatment cyclic water tank connection aerobic tank clear liquid and liquid alkaline pipeline, are sprayed by cleaning solution spray tube
Liquid is drenched, the pH of exhaust gas is adjusted, biofilter cyclic water tank connects aerobic tank mud mixture and intermediate water pipeline, supplements biological filter
The biological bacteria in pond and the water of cyclic water tank.
Preferably, the escape pipe of the biofilter connection connects exhaust tube, the exhaust tube bottom by centrifugal blower
Portion is also connected to exhausting pipeline, discharges the hydrops in exhaust tube.
Preferably, the filtrate of the biological filter bed of material of the pretreating zone is the spherical volcanic rock of 20-30mm, by aerobic tank
Clear liquid and lye are sprayed on volcanic rock, the pH of exhaust gas are adjusted by the gap of volcanic rock, and absorb by the clear liquid of aerobic tank
Hydrogen sulfide and ammonia in exhaust gas reach by the organic matter in volcanic rock absorption, degradation exhaust gas and adjust wastewater pH and initial breakdown
The Effect of Pretreatment of exhaust gas pre-processes 304 sieves for placing 10 mesh on flase floor, is laid with filtrate above sieve, filtrate height exists
1.2-1.5m。
Preferably, the filtrate of the biological filter bed of material of the biofilter is sponge ball, coke, and the muddy water of aerobic tank is mixed
Object is sprayed on sponge ball and coke, and the surface of sponge ball and coke and internal aufwuch bacterium, pollutant enter from filtrate
It is attached in the biomembrane of filter material surface, hydro carbons and other organic components are oxidized and are decomposed into CO2And H2O, containing sulfur reduction at
Divide and is oxidized to S, SO4 2-, nitrogen containing component, which is oxidized, resolves into NH4 -、NO2 -And NO3 -；By in biological bacteria biodegrade exhaust gas
Pollutant supplements the water level of cyclic water tank by middle water.
The invention has the advantages that
Sewage plant bad smell biological purification system provided by the present invention increases in equipment leading portion and pre-processes, ensures subsequent life
Change the effect of processing.Dominant bacteria is cultivated in biological treatment, the pollutant in exhaust gas of targetedly degrading is removed compared to tradition
Smelly technique, treatment effect and operation stability are more preferable, specific manifestation are as follows: the pressure loss is small, and equipment operation energy consumption is low, operating cost
Lower than other methods, such as absorbent charcoal method, incineration method；Real green method --- do not use harmful chemicals, energy
Source demand is cheap, does not generate secondary pollution, and last product is benign；Automatic Control, all weather operations need to only patrol
Depending on stable and reliable operation adapts to the operation conditions of different condition；Treatment effeciency is high, removal effect is obvious, easy maintenance, satisfaction
Different operating environment.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and embodiments:
Fig. 1 is the structural schematic diagram of sewage plant bad smell biological purification system of the present invention.
Specific embodiment
As shown in Figure 1, the disclosed sewage plant waste gas purification based on pretreatment and biofilter group technology
System, including gas sampling and transportation system, pretreatment and biofilter group technology, transportation system convey the exhaust gas of collection
Group technology to pretreatment and biofilter is purified, and cleaning solution spray is respectively equipped at the top of pretreatment and biofilter
Pipe, bottom are respectively equipped with gas distribution system, and middle part is respectively equipped with the biological filter bed of material, and biofilter left bottom is equipped with and pretreating zone
The air inlet pipe of connection, biofilter right hand top are equipped with the escape pipe being connected to biological treatment zone, pretreatment top and biology
The ventilation pipe for communicating pretreatment top and biofilter is equipped between the bottom of filter tank.
The cabinet material of the exhaust gas biological purifying system is 304 square steel frames, PP plate or frp lining, outer 30-
The heat preservation of 50mm heat-preservation cotton and 304 plate external decorations, waste gas delivery pipeline road are PP material or glass steel material, prevent the acidity of exhaust gas
Gas attack pipeline.Liner is that PP plate or glass reinforced plastic prevent exhaust gas from corroding material, while preventing biological bacteria degradation inner lining material.
It is separated between the pretreatment, the biological filter bed of material and gas distribution system by filler supporting plate, the filler supporting plate is adopted
With glass fiber reinforced grid-like panel, flase floor is with a thickness of 25mm, Kong Wei 20*20mm.
It is described to be separately installed with pretreatment cyclic water tank and biofilter cyclic water tank.It is described pretreatment cyclic water tank into
Water is the clear liquid of aerobic tank, and alkali circulation is liquid alkaline (liquid sodium hydroxide), and outlet pipe is transported to washing for top by water circulating pump
Liquid spray tube is washed, after pretreated media filtration, pretreatment bottom water outlet is connected with cyclic water tank, pre-processes recirculated water
Case is equipped with filter screen, emptying and overflow pipe.
The water inlet of the pretreatment cyclic water tank is the clear liquid of aerobic tank, and the pH of clear liquid is 7.5 ~ 8.5, passes through aerobic tank
Clear liquid reduces the liquid feeding alkali number for neutralizing exhaust gas pH, and the pH of control loop water tank is 7.0 ~ 8.0, when the pH of cyclic water tank is lower than 7.0
When liquid feeding alkali, improve pH to 8.0, when the pH of cyclic water tank reaches 8.0, stop liquid feeding alkali, entered by continuous exhaust gas pre-
In processing, the pH of cyclic water tank is gradually reduced, and when reaching 7.5 to pH, adds aerobic tank clear liquid, continues into pre- place with exhaust gas
In reason, the pH of cyclic water tank is dropping to 7.0, stops the clear liquid for adding aerobic tank at this time, starts to add liquid alkaline.Pass through above-mentioned chemistry
It reacts, hydrogen sulfide, ammonia and the mercaptan etc. in exhaust gas are fully dissolved in the water of cyclic water tank, reach the pretreatment of alkali cleaning exhaust gas
Purpose realizes the removal of hydrogen sulfide and 90% or more ammonia, the removal of 95% or more mercaptan.Odor concentration in exhaust gas is from 5000
~ 8000 are reduced to 2500 ~ 4000, realize the removal rate of 50% or more foul smell.When the conductivity of cyclic water tank reaches 5000 ~
When 8000us/cm, the water of cyclic water tank is drained into the conditioning tank of sewage treatment plant by exhausting pipeline, is further handled.
The spherical volcanic rock that the pretreatment filtrate is 20-30mm, filtrate height pre-process lattice in 1.2-1.5m or so
304 sieves of 10 mesh are placed on screen, filtrate is laid with above sieve, and filtrate service life is 12 ~ 15 years.
The dust in removal foul smell is realized in the pretreatment, prevents dust from entering subsequent bio trickling filter and pressure drop is caused to increase
Greatly, to avoid the increase of the operating cost even failure of operation.By washing, keep the foul smell into subsequent biological treatment device wet
Degree reaches degree of saturation, meets strict demand of the biological treatment to humidity.By washing with water, it is useless that part solubility can also be removed
Gas composition mitigates impact load caused by causing smelly ingredient mutation to a certain extent, guarantees the phase of subsequent biological treatment foul smell load
To stabilization.
6.8 ~ 7.2 or so of the biofilter cyclic water tank, odor concentration are reduced to 20 hereinafter, real from 2500 ~ 4000
The qualified discharge of existing foul smell.When the conductivity of cyclic water tank reaches 2000 ~ 3000us/cm, by the water of cyclic water tank by putting
Vacant duct drains into the conditioning tank of sewage treatment plant, and water in supplement, supplement is primary within the mud mixture of aerobic tank every 3 days, and control follows
The biomass of ring water tank is 5% or so after being precipitating 30min.The temperature of control loop Water in Water Tanks guarantees biology at 20 ~ 30 DEG C
The production and breeding of bacterium.
The sulphur such as hydrogen sulfide, methyl mercaptan, methyl sulfide, ethyl sulfide, methyl disulfide, carbon disulfide system is disliked the biofilter
Sordes matter is handled, and the odor pollutant into microbial cell is decomposed benefit as the movable energy of microbial life or nutrient
With so that pollutant be enable to remove.The gaseous pollutant of class containing organic sulfur in exhaust gas, in biological treatment section by being attached to biology
The composite bacterias such as grate sulfur thiobacillus, Thiobacillus thioxidans on filler carry out biodegrade, and gas and filler is appropriately extended
Organic sulfur class gaseous contamination is degraded to SO by effective time of contact4 2-, S2-, SO3 2-Deng.
The specific transforming principle in the biofilter is as follows: entering the intracorporal organic matter of microbial cell, in various cells
Under the catalytic action of interior enzyme (dehydrogenase, oxidizing ferment etc.), microorganism carries out oxygenolysis to it, while carrying out anabolism generation
New microbial cell.A part of organic matter is eventually converted into H by oxygenolysis2O and CO2Etc. stable inorganic substances, and from
Energy required for middle acquisition synthesis neoblast substance (plasm).This process can be as follows with formula:
。
At the same time, microorganism is synthesized using generated energy in another part organic matter and catabolic process
Metabolism is to form new cellular material.This process can be represented by the formula:
。
In above-mentioned conversion process, when the content abundance of organic substrates, microorganism is in Fast growth phase, will have a large amount of
New cell synthesis, but with the continuous growth of the continuous oxygenolysis of substrate and microorganism and cellular material quantity, microorganism is raw
Production is gradually not being met to the demand of organic substrates, and microorganism will go into the endogenous respiration stage.Microorganism is to certainly at this time
Body cellular material carries out oxygenolysis, and generates energy, becomes and its growth and breeding is maintained to provide the major way of energy, see below formula
。
The process of the biofilter biological treatment mainly divides three steps: pollutant is adsorbed on filtrate by the first step.This
One process is determined by the good adsorbent performance of filtrate.The hydrophobicity of its coating enhances absorption slightly solubility organic pollutant
Ability.This adsorption process ensure that and degrade to greatest extent to pollutant, while but also biofilter is transported in system
Capable has fairly good treatment effect at the very start.Furthermore suction-operated can guarantee that higher impact load energy is resisted in filter tank
Power, good treatment effect can also be reached by fluctuating big foul smell for flow and pollutant concentration.Second step, pollutant is from filter
Enter on material and is attached in the biomembrane of filter material surface.Third step, reduced sulphur compound are oxidized to water under the action of microorganism,
CO2And H2SO4。
The escape pipe of the biofilter connection connects exhaust tube by centrifugal blower, and the exhaust tube bottom is also connected to
Exhausting pipeline discharges the hydrops in exhaust tube, realizes the qualified discharge of exhaust gas.The technology of above-described embodiment only to illustrate the invention
Design and feature can not its object is to allow person skilled in the art to can understand the content of the present invention and implement it accordingly
It is limited the scope of the invention with this.The modification that the Spirit Essence of all main technical schemes according to the present invention is done, should all contain
Lid is within protection scope of the present invention.
Claims (5)
1. the sewage plant waste gas cleaning system based on pretreatment and biofilter group technology, including gas sampling and delivery system
The exhaust gas of collection is transported to pretreatment and biofilter combination system by system, pretreatment and biofilter combined system, transportation system
System is purified, and the pretreatment and biofilter combined system include the pretreating zone and biofilter divided side by side, pre- to locate
It is respectively equipped with cleaning solution spray tube at the top of reason area and biofilter, bottom is respectively equipped with gas distribution system, and middle part is respectively equipped with life
Object filter material layer, pretreating zone left bottom are equipped with the air inlet pipe being connected to pretreating zone, and biofilter right hand top is equipped with and life
The escape pipe of object filter tank connection, being equipped between pretreating zone top and biofilter bottom makes pretreating zone and biofilter phase
Logical ventilation pipe；It is also separately installed with pretreatment cyclic water tank on the outside of the sewage plant waste gas cleaning system and biofilter is followed
Ring water tank；The water inlet of the pretreatment cyclic water tank is the clear liquid and liquid alkaline of aerobic tank, and outlet pipe is conveyed by water circulating pump
To the cleaning solution spray tube at top, after the filtering of the biological filter bed of material of pretreating zone, pretreating zone bottom water outlet and circulation
Water tank is connected, and pretreatment cyclic water tank is equipped with pH meter, liquidometer, filter screen, emptying and overflow pipe；The biofilter
Water inlet is aerobic tank mud mixture and middle water, and outlet pipe is transported to the cleaning solution spray tube at top by water circulating pump, is passed through
After the biological filter bed of material purification of biofilter, biofilter bottom water outlet is connected with cyclic water tank, biofilter cyclic water tank
If pH meter, liquidometer, thermometer, filter screen, emptying and overflow pipe；The pretreatment cyclic water tank connects aerobic tank clear liquid
The pH of exhaust gas is adjusted by cleaning solution spray tube ejecting liquid with liquid alkaline pipeline, biofilter cyclic water tank connects aerobic tank mud
Aqueous mixtures and intermediate water pipeline supplement the biological bacteria of biofilter and the water of cyclic water tank；It is described pretreatment cyclic water tank into
Water is the clear liquid of aerobic tank, and the pH of clear liquid is 7.5 ~ 8.5, and the liquid feeding alkali number for neutralizing exhaust gas pH is reduced by the clear liquid of aerobic tank,
The pH for controlling the pretreatment cyclic water tank is 7.0 ~ 8.0, the liquid feeding alkali when the pH of the pretreatment cyclic water tank is lower than 7.0,
PH to 8.0 is improved, when the pH of the pretreatment cyclic water tank reaches 8.0, stops liquid feeding alkali, is entered by continuous exhaust gas pre-
In treatment region, the pH of the pretreatment cyclic water tank is gradually reduced, and when pH reaches 7.5, adds aerobic tank clear liquid, with exhaust gas
It continues into pretreatment, the pH of cyclic water tank is dropping to 7.0, stops the clear liquid for adding aerobic tank at this time, starts to add liquid alkaline.
2. sewage plant waste gas cleaning system according to claim 1, it is characterised in that: the pretreating zone and biofilter
The biological filter bed of material and gas distribution system between separated by filler supporting plate, the filler supporting plate use glass fiber reinforced grid-like panel, lattice
For screen with a thickness of 25mm, plate body is evenly distributed with the through-hole of several 20*20mm.
3. sewage plant waste gas cleaning system according to claim 1, it is characterised in that: the biofilter connection goes out
Tracheae connects exhaust tube by centrifugal blower, and the exhaust tube bottom is also connected to exhausting pipeline, discharges the hydrops in exhaust tube.
4. sewage plant waste gas cleaning system according to claim 1, it is characterised in that: the biofilter material of the pretreating zone
The filtrate of layer is the spherical volcanic rock of 20-30mm, and aerobic tank clear liquid and lye are sprayed on volcanic rock, volcanic rock is passed through
Gap adjusts the pH of exhaust gas, and absorbs hydrogen sulfide and ammonia in exhaust gas by the clear liquid of aerobic tank, passes through volcanic rock absorption, degradation
Organic matter in exhaust gas reaches the Effect of Pretreatment for adjusting wastewater pH and initial breakdown exhaust gas, pre-processes and places 10 on flase floor
304 sieve of purpose is laid with filtrate above sieve, and filtrate height is in 1.2-1.5m.
5. sewage plant waste gas cleaning system according to claim 1, it is characterised in that: the biofilter material of the biofilter
The filtrate of layer is sponge ball, coke, and the mud mixture of aerobic tank is sprayed on sponge ball and coke, sponge ball and coke
Surface and internal aufwuch bacterium, pollutant enters from filtrate to be attached in the biomembrane of filter material surface, and hydro carbons has with other
Machine object ingredient, which is oxidized, is decomposed into CO2And H2O, ingredient containing sulfur reduction are oxidized to S, SO4 2-, nitrogen containing component, which is oxidized, to be resolved into
NH4 -、NO2 -And NO3 -；By the pollutant in biological bacteria biodegrade exhaust gas, the water level of cyclic water tank is supplemented by middle water.
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