CN104086011B - Be applicable to the technique of zero discharge of viscose fibre industry acid station waste water - Google Patents

Be applicable to the technique of zero discharge of viscose fibre industry acid station waste water Download PDF

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CN104086011B
CN104086011B CN201410319255.4A CN201410319255A CN104086011B CN 104086011 B CN104086011 B CN 104086011B CN 201410319255 A CN201410319255 A CN 201410319255A CN 104086011 B CN104086011 B CN 104086011B
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water
acid
acid station
cooling
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CN104086011A (en
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殷宗正
龙国强
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Yibin Grace Group Co Ltd
Chengdu Grace Fiber Co Ltd
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Yibin Grace Group Co Ltd
Chengdu Grace Fiber Co Ltd
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Abstract

The invention discloses the technique of zero discharge being applicable to viscose fibre industry acid station waste water, comprise the steps: to set up circulating water reclamation pond, the total water of cooling after the process of acid station is delivered to circulating water reclamation pond, and regulates the pH value of this circulating water reclamation Chi Neixunhuanshui to be 6 ~ 8; The recirculated water that steps A obtains is carried out shunting deliver to acid station and spin between practice and carry out processing and reuse, overcome existing acid station waste water directly to deliver to water resource waste that sewage works may cause, produce the defects such as load is large, by the batch treatment carried out acid station waste water and reuse, finally reach the processing requirement of zero release, there is good promotional value.

Description

Be applicable to the technique of zero discharge of viscose fibre industry acid station waste water
Technical field
The present invention is the technique of zero discharge being applicable to viscose fibre industry acid station waste water, and be specifically related to be that acid station waste water in production process of viscose fiber is carried out Treated sewage reusing, stage treatment finally reaches acid station wastewater zero discharge, belongs to viscose staple fibre technical field.
Background technology
In the production process of viscose fiber, acid station is responsible for the acid bath meeting processing requirement to deliver in spinning-drawing machine bath, and viscose glue, after the maturation of raw material workshop, to be entered in spinning-drawing machine bath by spinning nozzle duct and solidifies formation tow in spinning workshop.Wherein, the task at acid station mainly contains three: make acid bath carry out circulating, allocating acid bath and reclaim acid bath, when reality uses, due to the chemical transformation that spinning process occurs, the composition of acid bath also can great changes will take place thereupon, such as: viscose glue is brought large quantity of moisture and neutralization reaction into and generated moisture acid bath is diluted, in neutralization reaction, consume sulfuric acid, make sulfuric acid concentration of component in acid bath thinning, have simultaneously and generate too much sodium sulfate; The a series of side reactions occurred in viscose glue forming process, the impurity such as the half fine and ash content that the colloid sulphur produced, sulfide and viscose glue are brought into, the blob of viscose that produces in viscose glue forming process enter acid bath, there is a small amount of hydrogen sulfide simultaneously, carbon disulfide gas is dissolved in acid bath, acid bath is made to become muddy, therefore, in order to ensure normally carrying out of spinning, acid bath must keep certain degree of cleaning and stable processing condition.Existing situation is: often produce one ton of viscose fiber in reaction process by the waste water of generation 5 side in acid bath, acid bath gets back to acid station through returning acid tube, need degassed through multiple-effect, allocate, filter by reaction produce waste water be separated, on the one hand, waste water directly enters sewage works after cooling temperature adjustment, the water yield about 1500 side of discharge every day, water temperature about 40 degree, acidity is about 500mg/l; On the other hand, acid bath continues to deliver to spinning-drawing machine bath from acid station, then is back to acid station from spinning-drawing machine bath, constantly circulates.
Based on the above-mentioned condition of production, also there is following defect:
(1) water resource waste: the condensation sewage of acid station discharge, though containing a small amount of acid, quality is overall better, more thorough, directly discharge and waste water resource;
(2) increase production load: condensation sewage side's every day about 1500 discharged by acid station, quantity discharged is large, and add the load of sewage works, the unit consumption causing spinning to be produced increases;
(3) pollution is larger: acid station needs 8, clear water backwash every day filter for purifying acid bath, every platform uses clear water 40 side, sewage after cleaning directly discharges, acid bath after cleaning, containing acid and zinc sulfate, containing a large amount of sulfuric acid and zinc sulfate in the sewage after backwash, is the main pollutent of chemical fibre industry, directly be disposed to sewage works, need drop into more medicament and alkali, treatment process difficulty strengthens, cost up.
The existing viscose fiber wastewater process side method disclosed, as: CN102351379, CN100494087C are all a kind of comprehensive processing techniques for viscose fibre industry waste water, although it is effective for processing trade effluent on the whole, but and the unresolved above-mentioned condition of production bring as: water resource waste, produce the defects such as load is large, therefore, the present invention arises at the historic moment.
Summary of the invention
The object of the present invention is to provide the technique of zero discharge being applicable to viscose fibre industry acid station waste water, this processing method overcomes existing acid station waste water and directly delivers to water resource waste that sewage works may cause, produces the defects such as load is large, acid station waste water is carried out batch treatment and reuse, finally reach the processing requirement of zero release, there is good promotional value.
The present invention is achieved through the following technical solutions: the technique of zero discharge being applicable to viscose fibre industry acid station waste water, comprises the steps:
A: set up circulating water reclamation pond, delivers to circulating water reclamation pond by the total water of cooling after the process of acid station, and regulates the pH value of this circulating water reclamation Chi Neixunhuanshui to be 6 ~ 8;
B: the recirculated water that steps A is obtained, wherein 1% ~ 99% or whole recirculated water send into hollow type water cooling tower and process, and then return the operation that step C or D step are carried out in acid station; The recirculated water of 0% ~ 99% returns the operation spun and carry out E step between practice;
C: described 1% ~ 99% or whole recirculated water send into acid station multiple-effect de-gassing vessel, the water coolant as this acid station multiple-effect de-gassing vessel uses.
D: described 1% ~ 99% or whole recirculated water comprise: send into acid station multiple-effect de-gassing vessel, for water coolant the stand acid bath filter sour with feeding that this acid station multiple-effect de-gassing vessel carries out cooling, and for acid bath filter cleaning backwash water, its usage quantity is counted in mass ratio, water coolant: backwash water=(8 ~ 12): (3 ~ 5).
Water and plasticizing water send into the plasticizing workshop section spun between practice to the recirculated water of E: described 0% ~ 99% in the lump as a supplement.
The present invention is by self-built circulating water reclamation pond, effectively acid station waste water can be carried out batch treatment and reuse, and finally reach the processing requirement of zero release, when reality uses, according to concrete processing condition, major part adopts the using forestland of 24 hours, that is: recirculated water send into acid station multiple-effect de-gassing vessel and as a supplement water send into the process spun between practice be 24 hours of operation, the operation that feeding acid bath filter serves as backwash water is then determined on a case-by-case basis, it is very reasonable to design, wherein, the principle of work of acid station multiple-effect de-gassing vessel is: utilize water in the air pressure characteristic that more lower boiling is lower, under the condition of the least possible use steam, the moisture content in acid bath is separated, backwash is then carry out opposite direction cleaning, mainly in order to remove the impurity in acid bath with water and air to acid bath filter.
Described hollow type water cooling tower also comprises collecting tank, is also provided with the reuse pipe be connected with circulating water reclamation pond bottom described collecting tank.
Described D step also comprises: arrange reverse osmosis unit, carries out reverse osmosis to the sewage produced after the acid bath filter backwash of acid station, through the filtered water reuse of reverse osmosis to soft water system; Mother liquor is then removed after impurity and sour mud through microporous filter and is obtained filtered liquid, and be finally back to acid bath system, described reverse osmosis unit is the polymer ceramic film of molecular weight 50, ratio of desalinization 99.7%.
In aforesaid operations, the principle of reverse osmosis is: use polymer ceramic film, passed through only for water molecules by pressure difference, unsanctioned material all gets back to mother liquor, the water molecules (water after namely filtering) passed through is to reach the requirement of soft water, therefore, be back to soft water system, can be used for the allotment of fiber or glassine paper production plant stone nearby, and main cellulose in the impurity removed and sour mud, therefore, also can send into boiler house temporarily and mix coal combustion, improve the utilization ratio of acid station waste water.
In described steps A, the method of circulating water PH value is regulated to comprise: acidometer to be installed respectively in circulating water reclamation pond and line mixer is set on cooling water-main road, in the total water of cooling, add alkali lye by line mixer, then by acidometer, on-line monitoring and adjustment are carried out to circulating water PH value.
For better realizing aforesaid operations, described alkali lye is the sodium hydroxide of concentration 50 ~ 70g/L.
In described steps A, the volume in circulating water reclamation pond is 700 ~ 900L, and the temperature cooling total water is 35 ~ 45 DEG C, and the flow velocity delivering to circulating water reclamation pond is 50 ~ 80L/h.
Optimize, the volume in described circulating water reclamation pond is 800L, and the temperature cooling total water is 40 DEG C.
In described step B, the recirculated water flow velocity sending into hollow type water cooling tower is 1200 ~ 1500L/h, and the circulating water temperature after the process of hollow type water cooling tower is 30 ~ 35 DEG C.
Spinning between practice is product cell viscose glue reaction being generated fiber production, its plasticizing workshop section carries out boiling to the fiber strand silk generated, need in the process constantly to supplement plasticizing water, the present invention adopts impeller pump recirculated water to be delivered to plasticizing workshop section, that is: described step B also comprises: be arranged at the impeller pump spinning front end between practice, the recirculated water of described 0% ~ 99% is then back to by impeller pump and spins between practice, when reality uses, except for plastifying except water make up water, also can be used for cleaning floor water, the scope of application is wider.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention is reasonable in design, existing viscose fibre industry waste water is all disposed to sewage works, and then adopts the method for the comprehensive regulation to process, but for acid station waste water, all be disposed to the waste that sewage works causes water resources first, second can strengthen the working load of sewage works, therefore, the present invention establishes circulating water reclamation pond for acid station waste water specially, targetedly acid station waste water is processed, effect is very good, meanwhile, also meets the requirement of environmental protection.
(2) the present invention adopts alkali lye to carry out PH adjustment to the total water of the cooling of collecting in circulating water reclamation pond, Main Function is: because foul condensate is supplementing always, about recirculated water spontaneous evaporation every day about 600 side, in order to prevent, recirculated water acidity is accumulative to be raised, corrosive acid station condensing equipment, therefore, alkali lye need be added and pH value adjustment is carried out to water of condensation.
(3) object that the present invention is based on zero release is set out, on the basis that acid station waste water is processed, also can realize again utilizing, such as: substitute clear water and do the degassed and vacuum pump water of condensation of acid station multiple-effect, return to spin between practice and do plasticizing water make up water etc., save the usage quantity of clear water, effective loss and the waste reducing water resources.
(4) the present invention also further provides the processing scheme to sewage after the acid bath filter backwash of acid station, the program can effectively be filtered sulfuric acid a large amount of in sewage and zinc sulfate, thus reaching the object reducing sewage works processing cost, improve processing efficiency, result of use is good.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
The present invention is the technique of zero discharge being applicable to viscose fibre industry acid station waste water, be mainly avoid existing acid station waste water directly to deliver to sewage works and cause water resource waste, produce the defects such as load is large, adopt the mode of batch treatment and reuse, realize the technique of zero discharge of acid station waste water, environmental protection is practical, and specific implementation is as follows:
Collect waste water: set up volume to be the circulating water reclamation pond of 700L in the below of acid station (acid station workshop), and in this circulating water reclamation pond, acidometer is installed, the total water of cooling being 35 DEG C by temperature after the process of acid station delivers to circulating water reclamation pond with the flow velocity of 50L/h, and in the total water of cooling, add alkali lye by the line mixer be arranged on cooling water-main road, if concentration is the sodium hydroxide of 50 ~ 70g/L, in advance neutrality is adjusted to the total water of cooling, and then regulated by the pH value of acidometer to recirculated water, regulate circulating water PH value to be 6.
Effluent segregation: according to concrete technology condition, shunts the recirculated water of the existing 1500L of having a daily output of, and wherein 950L recirculated water delivers to acid station, 550L recirculated water delivers to and spin between practice, carries out respectively processing or recycling, is specifically summarized as follows:
Acid station: 1500L recirculated water is sent into hollow type water cooling tower with the flow velocity of 1200L/h and carries out cooling process, and send into collecting tank, reuse pipe is provided with bottom collecting tank, the top at acid station is all located at by collecting tank and hollow type water cooling tower, recirculated water after cooling adopts two position difference to flow automatically to enter multiple-effect and reuse to circulating water reclamation pond, energy consumption is low, after cooling, the temperature of this recirculated water is 30 DEG C, and then deliver to acid station multiple-effect de-gassing vessel and acid bath filter two place, acid station respectively with the ratio of quality proportioning 8:3, wherein, to deliver to the recirculated water of acid station multiple-effect de-gassing vessel for major portion, usual employing continues conveying in 24 hours, and based on the principle of work of acid station multiple-effect de-gassing vessel: utilize water in the air pressure characteristic that more lower boiling is lower, under the condition of the least possible use steam, the moisture content in acid bath is separated, at this, then the water coolant of the recirculated water delivering to acid station multiple-effect de-gassing vessel as this acid station multiple-effect de-gassing vessel is used, the recirculated water delivering to acid station acid bath filter uses usually used as backwash water, in the acid bath filter of acid station, the principle of backwash carries out opposite direction cleaning with water and air to acid bath filter, mainly in order to remove the impurity in acid bath, therefore, in actual mechanical process, recirculated water is delivered to acid station acid bath filter as backwash water clear up, usually will depending on processing condition, carry out just need enabling when needs are cleared up acid station acid bath filter, during not enabled, 700L recirculated water is then all delivered to acid station multiple-effect de-gassing vessel and is used as water coolant, flexible design, convenient.
For further improving the reclamation rate of acid station waste water, acid station acid bath filter is provided with reverse osmosis unit, mainly reverse osmosis is carried out to the sewage produced after the acid bath filter backwash of acid station, its principle is: molecular weight 50, the polymer ceramic film of ratio of desalinization 99.7%, passed through only for water molecules by pressure difference, unsanctioned material all gets back to mother liquor, the water molecules (water after namely filtering) passed through is to reach the requirement of soft water, therefore, be back to soft water system, can be used for the allotment of fiber or glassine paper production plant stone nearby, mother liquor is then removed after impurity and sour mud through microporous filter and is obtained filtered liquid, finally be back to acid bath system, and main cellulose in the impurity removed and sour mud, therefore, also can send into boiler house temporarily and mix coal combustion, improve the utilization ratio of acid station waste water, practical effect is good, the reclamation rate of sewage is up to 98%.
Spin between practice: spinning between practice is product cell viscose glue reaction being generated fiber production, its plasticizing workshop section carries out boiling to the fiber strand silk generated, therefore, need constantly to supplement plasticizing water, at this, the present invention arranges impeller pump spinning front end between practice, adopts the mode continuing conveying for 24 hours, by 550L recirculated water by centrifugal pumping to spinning between practice, as a supplement water and plasticizing water send into the plasticizing workshop section spun between practice in the lump.
Measure the reclamation rate of the recirculated water after above-mentioned shunting, recirculated water reclamation rate is 95%, substantially can reach the processing requirement of acid station wastewater zero discharge, is suitable for extensively promoting the use of.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is, concrete operating parameters is different, and specific implementation is as follows:
Collect waste water: set up volume to be the circulating water reclamation pond of 800L in the below of acid station (acid station workshop), and in this circulating water reclamation pond, acidometer is installed, the total water of cooling being 40 DEG C by temperature after the process of acid station delivers to circulating water reclamation pond with the flow velocity of 65L/h, and in the total water of cooling, add alkali lye by the line mixer be arranged on cooling water-main road, if concentration is the sodium hydroxide of 50 ~ 70g/L, in advance neutrality is adjusted to the total water of cooling, and then regulated by the pH value of acidometer to recirculated water, regulate circulating water PH value to be 7.
Effluent segregation: according to concrete technology condition, shunts the recirculated water of the existing 1500L of having a daily output of, and wherein 950L recirculated water delivers to acid station, 550L recirculated water delivers to and spin between practice, carries out respectively processing or recycling, is specifically summarized as follows:
Acid station: 1500L recirculated water is sent into hollow type water cooling tower with the flow velocity of 1200L/h and carries out cooling process, and send into collecting tank, reuse pipe is provided with bottom collecting tank, the top at acid station is all located at by collecting tank and hollow type water cooling tower, after cooling, the temperature of this recirculated water is 33 DEG C, and then deliver to acid station multiple-effect de-gassing vessel and acid bath filter two place, acid station respectively with the ratio of quality proportioning 5:2, the recirculated water delivering to acid station multiple-effect de-gassing vessel uses as water coolant, the recirculated water delivering to acid station acid bath filter uses as backwash water, owing to being provided with reverse osmosis unit, mainly reverse osmosis is carried out to the sewage produced after the acid bath filter backwash of acid station, therefore, the sewage produced after the acid bath filter backwash of acid station is through molecular weight 50, the polymer ceramic film of ratio of desalinization 99.7% filters, water after filtration by reuse to soft water system, can be used for the allotment of fiber or glassine paper production plant stone nearby, mother liquor is then removed after impurity and sour mud through microporous filter and is obtained filtered liquid, finally be back to acid bath system, and the impurity removed and sour Fender can be sent into boiler house temporarily and mix coal combustion, improve the utilization ratio of acid station waste water, wherein, the reclamation rate of sewage is up to 98%.
In the process, clear up due to recirculated water is delivered to acid station acid bath filter as backwash water, usually will depending on processing condition, carry out just need enabling when needs are cleared up acid station acid bath filter, therefore, during not enabled, 950L recirculated water is then all delivered to acid station multiple-effect de-gassing vessel and is used as water coolant, flexible design, convenient.
Spin between practice: adopt 24 hours continue conveying mode, by 550L recirculated water by centrifugal pumping to spinning between practice, as a supplement water and plasticizing water send into the plasticizing workshop section spun between practice in the lump.
Measure the reclamation rate of the recirculated water after above-mentioned shunting, recirculated water reclamation rate is 95%, substantially can reach the processing requirement of acid station wastewater zero discharge, is suitable for extensively promoting the use of.
Embodiment 3:
The difference of the present embodiment and embodiment 1 and embodiment 2 is, concrete operating parameters is different, and specific implementation is as follows:
Collect waste water: set up volume to be the circulating water reclamation pond of 900L in the below of acid station (acid station workshop), and in this circulating water reclamation pond, acidometer is installed, the total water of cooling being 45 DEG C by temperature after the process of acid station delivers to circulating water reclamation pond with the flow velocity of 80L/h, and in the total water of cooling, add alkali lye by the line mixer be arranged on cooling water-main road, as the sodium hydroxide that concentration is 50 ~ 70 grams, in advance neutrality is adjusted to the total water of cooling, and then regulated by the pH value of acidometer to recirculated water, regulate circulating water PH value to be 8.
Effluent segregation: according to concrete technology condition, shunts the recirculated water of the existing 1500L of having a daily output of, and wherein 950L recirculated water delivers to acid station, 550L recirculated water delivers to and spin between practice, carries out respectively processing or recycling, is specifically summarized as follows:
Acid station: 1500L recirculated water is sent into hollow type water cooling tower with the flow velocity of 1200L/h and carries out cooling process, and send into collecting tank, reuse pipe is provided with bottom collecting tank, the top at acid station is all located at by collecting tank and hollow type water cooling tower, after cooling, the temperature of this recirculated water is 35 DEG C, and then deliver to acid station multiple-effect de-gassing vessel and acid bath filter two place, acid station respectively with the ratio of quality proportioning 12:5, the recirculated water delivering to acid station multiple-effect de-gassing vessel uses as water coolant, the recirculated water delivering to acid station acid bath filter uses as backwash water, owing to being provided with reverse osmosis unit, mainly reverse osmosis is carried out to the sewage produced after the acid bath filter backwash of acid station, therefore, the sewage produced after the acid bath filter backwash of acid station is through molecular weight 50, the polymer ceramic film of ratio of desalinization 99.7% filters, water after filtration by reuse to soft water system, can be used for the allotment of fiber or glassine paper production plant stone nearby, mother liquor is then removed after impurity and sour mud through microporous filter and is obtained filtered liquid, finally be back to acid bath system, and the impurity removed and sour Fender can be sent into boiler house temporarily and mix coal combustion, improve the utilization ratio of acid station waste water, wherein, the reclamation rate of sewage is up to 98%.
In the process, clear up due to recirculated water is delivered to acid station acid bath filter as backwash water, usually will depending on processing condition, just need enable when needs are cleared up acid station acid bath filter, therefore, during not enabled, 700L recirculated water is then all delivered to acid station multiple-effect de-gassing vessel and is used as water coolant, flexible design, convenient.
Spin between practice: adopt 24 hours continue conveying mode, by 550L recirculated water by centrifugal pumping to spinning between practice, as a supplement water and plasticizing water send into the plasticizing workshop section spun between practice in the lump.
Measure the reclamation rate of the recirculated water after above-mentioned shunting, recirculated water reclamation rate is 95%, substantially can reach the processing requirement of acid station wastewater zero discharge, is suitable for extensively promoting the use of.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.

Claims (7)

1. be applicable to the technique of zero discharge of viscose fibre industry acid station waste water, it is characterized in that: comprise the steps:
A: set up circulating water reclamation pond, delivers to circulating water reclamation pond by the total water of cooling after the process of acid station, and regulates the pH value of this circulating water reclamation Chi Neixunhuanshui to be 6 ~ 8;
B: the recirculated water that steps A is obtained, wherein 1% ~ 99% or whole recirculated water send into hollow type water cooling tower and process, and then return the operation that step C is carried out at acid station; The recirculated water of 0% ~ 99% returns the operation spun and carry out D step between practice;
C: described 1% ~ 99% or whole recirculated water comprise: send into acid station multiple-effect de-gassing vessel, for water coolant the stand acid bath filter sour with feeding that this acid station multiple-effect de-gassing vessel carries out cooling, and for acid bath filter cleaning backwash water, its usage quantity is counted in mass ratio, water coolant: backwash water=(8 ~ 12): (3 ~ 5);
The recirculated water of D: described 0% ~ 99% as a supplement water and plasticizing water sends into the plasticizing workshop section spun between practice in the lump,
Described hollow type water cooling tower also comprises collecting tank, the reuse pipe be connected with circulating water reclamation pond is also provided with bottom described collecting tank, described step C also comprises: arrange reverse osmosis unit, reverse osmosis is carried out to the sewage produced after the acid bath filter backwash of acid station, through the filtered water reuse of reverse osmosis to soft water system; Mother liquor is then removed after impurity and sour mud through microporous filter and is obtained filtered liquid, and be finally back to acid bath system, described reverse osmosis unit is polymer ceramic film.
2. the technique of zero discharge being applicable to viscose fibre industry acid station waste water according to claim 1, it is characterized in that: in described steps A, the method of circulating water PH value is regulated to comprise: acidometer to be installed respectively in circulating water reclamation pond and line mixer is set on cooling water-main road, in the total water of cooling, add alkali lye by line mixer, then by acidometer, on-line monitoring and adjustment are carried out to circulating water PH value.
3. the technique of zero discharge being applicable to viscose fibre industry acid station waste water according to claim 2, is characterized in that: described alkali lye is the sodium hydroxide of concentration 50 ~ 70g/L.
4. the technique of zero discharge being applicable to viscose fibre industry acid station waste water according to claim 1, it is characterized in that: in described steps A, the volume in circulating water reclamation pond is 700 ~ 900L, the temperature cooling total water is 35 ~ 45 DEG C, and the flow velocity delivering to circulating water reclamation pond is 50 ~ 80L/h.
5. the technique of zero discharge being applicable to viscose fibre industry acid station waste water according to claim 4, it is characterized in that: the volume in described circulating water reclamation pond is 800L, the temperature cooling total water is 40 DEG C.
6. the technique of zero discharge being applicable to viscose fibre industry acid station waste water according to any one of claim 4 or 5, it is characterized in that: in described step B, the recirculated water flow velocity sending into hollow type water cooling tower is 1200 ~ 1500L/h, and the circulating water temperature after the process of hollow type water cooling tower is 30 ~ 35 DEG C.
7. the technique of zero discharge being applicable to viscose fibre industry acid station waste water according to claim 1, it is characterized in that: described step B also comprises: be arranged at the impeller pump spinning front end between practice, the recirculated water of described 0% ~ 99% is then back to by impeller pump and spins between practice.
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