CN109796107A - A kind of regeneration water source recirculated cooling water blowdown method for treating water - Google Patents
A kind of regeneration water source recirculated cooling water blowdown method for treating water Download PDFInfo
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- CN109796107A CN109796107A CN201910108168.7A CN201910108168A CN109796107A CN 109796107 A CN109796107 A CN 109796107A CN 201910108168 A CN201910108168 A CN 201910108168A CN 109796107 A CN109796107 A CN 109796107A
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Abstract
The invention discloses a kind of regeneration water source recirculated cooling water blowdown method for treating water, belong to field of waste water treatment.Step are as follows: recirculated cooling water sewerage, which enters after conditioning tank carries out water quality and quantity adjusting, successively to be handled through filter, ozone oxidation pond, buffer pool, the oxygen pond that disappears, anoxic pond, aerobic tank, primary sedimentation tank, dephosphorization mixing pit and fabric filter, wherein, disappear and fills biological rope filler in oxygen pond, anoxic pond and aerobic tank fill filler, anoxic pond supplements additional carbon, aerobic tank end nitrification liquid passes back into disappear oxygen pond and anoxic pond respectively, and Sludge from primary sedimentation tank passes back into the oxygen pond that disappears.The present invention can remove pollutants, the water outlets after processing such as ammonia nitrogen, total nitrogen, total phosphorus and the organic matter difficult to degrade in regeneration water source and meet the mg/L of CODcr≤30, total nitrogen≤15 mg/L, ammonia nitrogen≤1.5mg/L, total phosphorus≤0.3mg/L requirement.
Description
Technical field
The present invention relates to regeneration water source recirculated cooling water blowdown method for treating water, belong to technical field of waste water processing, more
It is a kind of method using advanced oxidation and biochemical combination processing cycle cooling water drainage sewage that body, which is said,.
Background technique
China be freshwater resources there is a serious shortage of one of country, shortage of water resources have become restrict China's Thermal Power Generation Industry can
An important factor for sustainable development.National Development and Reform Committee in 2004 has issued " about coal fired power plant project planning requirement related with construction
Notice ", it is desirable that in north water deficit area, encourage to utilize water or other waste water in municipal sewage plant.Due to Urban Regeneration
Water has the advantages that water is stable, can use on the spot, price is relatively cheap, and more and more thermal power generation corporations use Urban Regeneration
Water is as industrial water make-up water source.
Recycled water needs to meet certain water quality requirement as power plant's industrial water." industrial circulating cooling water processing design
Specification " (GB/T 50050-2017) regulation, when recycled water is directly as cold open system moisturizing, water quality indicator requires CODcr
≤ 60mg/L, ammonia nitrogen≤5.0(1.0) mg/L, total phosphorus≤1.0mg/L." urban sewage reutilization industry water standard " (GB/T
19923-2005) provide, recycled water be used as Open recirling cooling water system supplement water require CODcr≤60mg/L, ammonia nitrogen≤
10.0(1.0) mg/L, total phosphorus≤1.0mg/L.For thermal power generation corporations, since recirculated cooling water water consumption accounts for about entirely
The 50%~90% of Thermal Power Enterprises water consumption, wherein it is again maximum with the cooling water of cooling tower consumption, therefore recycled water is generally as cold
But tower recirculated cooling water supplements water, and cycles of concentration is about 3~5 times, recirculated cooling water blowdown water section water quality indicator such as CODcr,
TP, ammonia nitrogen etc. are up to 80~200mg/L, 1~5mg/L, 10~20mg/L.
Further to improve quality of water environment, part province has been put into effect more stringent local discharge standard successively, has been discharged into
The sewage in river needs to reach the water environment quality standard of respective classes.Such as " water pollutant is comprehensive for Beijing's provincial standard
Close discharge standard " (DB11/307-2013) regulation, it is discharged into the sewage execution B row of Beijing IV, V class water body and its charge for remittance range
Put limit value, it is desirable that the mg/L of CODcr≤30, total nitrogen≤15 mg/L, ammonia nitrogen≤1.5(2.5) mg/L, total phosphorus≤0.3mg/L etc..Again
The far super discharge standard, and presence such as different water index such as CODcr, TN, TP, ammonia nitrogen in the middle part of raw water source recirculated cooling water sewerage
B/C than low, biodegradability is poor, organic matter based on dissolubility hard-degraded substance, C/N ratio imbalance the problems such as, recycled water water source
Recirculated cooling water sewerage processing difficulty it is larger.These standards be embodied as Thermal Power Enterprises discharged wastewater met the national standard propose it is higher
Challenge, and recirculated cooling water sewerage accounts for the 70~80% of power plant's displacement, therefore, using recycled water as the circulating cooling at water source
The processing up to standard of water sewerage is these enterprises problem in the urgent need to address.
Zhang Hongtao etc. (Beijing Guohuan Tsinghua Environmental Engineering Desegn & Research Institute Co., Ltd.) (water supply and drainage, the phase of volume 42 the 5th)
Using water inlet pretreatment-complex biological filter depth denilrification system-coagulation-active filter filtration system-sterilization process processing
The recirculated cooling water sewerage and industrial wastewater at water source are regenerated, 20 mg/L of influent COD, ammonia nitrogen 2.5 mg/L, TP 1.4 are designed
40 mg/L of mg/L, TN, design water outlet 20 mg/L of COD, 10 mg/L of ammonia nitrogen 1.0 mg/L, TP 0.2 mg/L, TN.Using
For sodium acetate as denitrifying carbon source, PAC can be with qualified discharge as Dephosphorization reagent, water outlet.The technique due to water inlet in COD compared with
It is low, mainly by adding outer carbon source for denitrogenation, almost do not consider the removal of organic matter in Industrial Recirculating Cooling Water individually.If
Hardly degraded organic substance content is higher in Industrial Recirculating Cooling Water, then only relies on the technique and be difficult to meet qualified discharge requirement.
Summary of the invention
It is an object of the invention to overcome problems of the prior art, and provide a kind of regeneration water source recirculated cooling water
Blowdown method for treating water, after processing water outlet in CODcr, ammonia nitrogen, total nitrogen and total phosphorus can respectively reach≤30mg/L ,≤
The emission request of 1.5mg/L ,≤15mg/L ,≤0.3mg/L.
Technical solution used by the present invention solves the above problems is: a kind of regeneration water source recirculated cooling water blowdown water process
Method the steps include:
(1) regeneration water source recirculated cooling water sewerage enters conditioning tank, carries out water quality equilibrium and runoff investigation；
(2) conditioning tank water outlet enters ozone oxidation pond after being filtered, and ozone oxidation bottom of pond portion is provided with micropore cloth gas cap,
Material is titanium alloy, and top is provided with ozone tail gas destructor, and ozone oxidation water outlet enters buffer pool；
(3) buffer pool water outlet enters the oxygen pond that disappears, and using activated sludge and biomembrane complex method, bottom of pond is provided with water distribution in the oxygen pond that disappears
Pipe；
(4) the oxygen pond water outlet that disappears enters anoxic pond, and anoxic pond is provided with water distribution using activated sludge and biomembrane complex method, bottom of pond
Pipe, and agitating device is set, outer carbon source is added in anoxic pond；
(5) anoxic pond water outlet enters aerobic tank, and aerobic tank uses moving bed biofilm reactor, and bottom of pond is provided with aerator,
Aerobic tank mixed liquor partial reflux is to oxygen pond and the anoxic pond of disappearing；
(6) aerobic tank water outlet enters primary sedimentation tank, and primary sedimentation tank top clarified solution enters mixing pit, lower part sludge reflux to the oxygen pond that disappears；
(7) Dephosphorization reagent is added in mixing pit, fabric filter is entered after hybrid reaction and is filtered to get processing water outlet.
Filter is self-cleaning filter, and self-cleaning filter mainly removes the suspended matter in recirculating water blowdown water, is reduced
The consumption of ozone, filtering accuracy are 50~300 μm.
Ozone oxidation pond is mainly converted larger molecular organics difficult to degrade in recirculating water blowdown water to using ozone small
Molecular substance improves the biodegradability of waste water.Ozone oxidation pond is closed, to be sufficiently mixed ozone and waste water, takes air water inverse
Hybrid mode is flowed, residual ozone, which enters ozone tail gas destructor from pond top, to be destroyed.It is 5~30mg/ that ozone, which adds concentration,
L, reaction time are 10~60min.
Buffer pool mainly guarantees that remaining ozone can decompose in ozone oxidation water outlet, be reduced to micro- life in subsequent sludge
The influence of object, hydraulic detention time are 0.5~1h.
Oxygen pond disappear using activated sludge and biomembrane complex method, places biological rope in pond, material is polypropylene, Wei Ni
Synthetic fibre, nylon etc., outside fiber constitute fibrae circulares bundle, and 20~45mm of outer diameter, packing ratio 20~40%, main function is to reduce warp
Dissolved oxygen in ozone oxidation waste water and interior backflow mixed liquor, to eliminate excessively high dissolved oxygen to the unfavorable of denitrification denitrogenation effect
It influences, the hydraulic detention time in the oxygen pond that disappears should be 0.5~2h.
Anoxic pond is substantially carried out denitrification denitrogenation.To guarantee being normally carried out for anti-nitration reaction, thrown in anoxic pond water inlet end
Add outer carbon source, the outer carbon source added is one or more of methanol, ethyl alcohol, acetic acid, sodium acetate, grape sugar and starch.Anoxic
Pond uses activated sludge and biomembrane complex method, and filler is added in pond, and packing volume ratio is 10%~30%, and bottom of pond is provided with cloth
Mechanical stirring device is arranged in water pipe, guarantees the fluidisation of floating stuffing, and outlet setting intercepts sieve.By adjusting interior regurgitant volume control
Dissolved oxygen concentration is in 0.5mg/L or less in anoxic pond processed.
Aerobic tank uses moving bed biofilm reactor, is substantially carried out nitration reaction and removes the organic matter in waste water,
Filler is filled in reactor, is conducive to the growth of biomembrane.Packing density is 0.95~0.98g/cm3, specific surface area >=500m2/
m3, packing volume ratio is 20%~50%.Bottom of pond is equipped with micro-hole aerator or perforated pipe, and filler is up and down reciprocatingly transported in reactor
Dynamic, mass transfer effect is preferable, and biomembrane activity is higher.Reactor outlet is provided with mesh screen.Aerobic tank mixed liquor partial reflux is to disappearing
Oxygen pond and anoxic pond, total reflux ratio are 1~5:1, partially enter primary sedimentation tank.Primary sedimentation tank top clarified solution enters mixing pit, lower part
Sludge part is back to the oxygen pond that disappears, and is partially discharged into sludge reservoir.
Dephosphorization reagent is added in mixing pit, mainly includes aluminium salt and molysite, metal ion in dephosphorization amount and aluminium salt or molysite
Molar ratio be 1:1~2.Other medicaments also may be selected to medicament without specific limitation in dephosphorization process in mixing pit.
Compared with prior art, the present invention having the following advantages that and effect:
(1) a kind of processing method for regenerating water source recirculated cooling water sewerage is provided, it can be according to regeneration water source recirculated cooling water
Blowdown water pollutant feature, processing up to standard.
(2) the oxygen pond that disappears is set, enters the oxygen pond that disappears after backflow mixed liquor a part and ozone oxidation water outlet mixing, reduces waste water
In dissolved oxygen concentration, another part enters anoxic pond, adjusts dissolved oxygen concentration in anoxic pond, it is excessively high can both to have eliminated dissolved oxygen
The adverse effect of consumption and anti-nitration reaction to carbon source, and dissolved oxygen concentration in adjustable anoxic pond improve denitrification effect
Rate.
(3) filler is added in anoxic pond, using activated sludge and biomembrane complex method, improved biological in reaction tank
Amount, denitrification effect is good, and anti-load impact ability is strong.
Detailed description of the invention
Fig. 1 is the process flow chart in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment 1.
Certain thermal power plant regenerates in water source recirculating water blowdown water treatment process, and influent COD cr is 80~150mg/L, ammonia
Nitrogen is 8~15mg/L, and total nitrogen is 30~50mg/L, and total phosphorus is 1.5~3.5mg/L.Waste water is through conditioning tank regulating pondage and water quality
Enter self-cleaning filter afterwards, self-cleaning filter water outlet enters ozone oxidation pond, the closed setting in ozone oxidation pond, pond by top
Micropore cloth gas cap is arranged in bottom, and material is titanium alloy, and ozone is diffused into waste water through micropore cloth gas cap, and it is abundant to carry out adverse current with waste water
Ozone tail gas destructor is arranged in contact, ozone dosage 15mg/L, hydraulic detention time 30min, Chi Ding.Ozone oxidation pond
Water outlet enters buffer pool, residence time 45min.Buffer pool water outlet enters the oxygen pond that disappears, and biological rope is placed in pond, and material is dimension Buddhist nun
Synthetic fibre, outer diameter 30mm, packing ratio 20%, hydraulic detention time 1h.The oxygen pond water outlet that disappears from lower part enters anoxic pond, in the oxygen that disappears
Sodium acetate is added on the outlet conduit of pond as denitrifying carbon source, anoxic pond uses activated sludge and biomembrane compounding method,
Hydraulic detention time 2.5h, filler packing volume ratio are 25%, and agitating device is arranged in pool wall, guarantees the normal fluidisation of filler, anoxic
Pond water outlet enters aerobic moving bed biofilm reactor.Filler, packing volume ratio are added in aerobic moving bed biofilm reactor
It is 20%, dissolved oxygen concentration is 2~4mg/L, hydraulic detention time 6h.Aerobic tank mixed liquor a part passes back into the oxygen pond that disappears, reflux
Than for 2:1, another part passes back into anoxic pond, reflux ratio 1:1.Aerobic tank water outlet enters primary sedimentation tank, after precipitation and separation, on
Portion's clarified solution enters mixing pit, and lower part thickened sludge partial reflux enters to disappear oxygen pond, and reflux ratio 0.3:1 is partially discharged into sludge storage
Deposit pond.Waste water into mixing pit adds aluminium polychloride progress dephosphorization, dosage 20mg/L, and mixing pit water outlet enters hole
Modulability fabric filter is filtered.
After above-mentioned process, final outflow water CODcr, ammonia nitrogen, total nitrogen, total phosphorus meet respectively no more than 30mg/L,
The requirement of 1.5mg/L, 15mg/L and 0.3mg/L.
Embodiment 2.
Certain thermal power plant regenerates in water source recirculating water blowdown water treatment process, and influent COD cr is 100~200mg/L, ammonia
Nitrogen is 10~18mg/L, and total nitrogen is 30~65mg/L, and total phosphorus is 1.5~5mg/L.Waste water is after conditioning tank regulating pondage and water quality
Into self-cleaning filter, self-cleaning filter water outlet enters ozone oxidation pond, the closed setting in ozone oxidation pond, bottom of pond by top
Micropore cloth gas cap is set, and material is titanium alloy, and ozone is diffused into waste water through micropore cloth gas cap, carries out adverse current with waste water and sufficiently connects
Ozone tail gas destructor is arranged in touching, ozone dosage 20mg/L, hydraulic detention time 40min, Chi Ding.Ozone oxidation pond goes out
Water enters buffer pool, residence time 50min.Buffer pool water outlet enters the oxygen pond that disappears, and places biological rope in pond, material is vinylon
And polypropylene, outer diameter 45mm, packing ratio 25%, hydraulic detention time 1.5h.The oxygen pond water outlet that disappears from lower part enters anoxic
Pond adds methanol as denitrifying carbon source disappearing on the outlet conduit of oxygen pond, anoxic pond is using activated sludge and the compound place of biomembrane
Reason method, hydraulic detention time 3h, filler packing volume ratio are 35%, and agitating device is arranged in pool wall, guarantees the normal stream of filler
Change, anoxic pond water outlet enters aerobic moving bed biofilm reactor.Filler is added in aerobic moving bed biofilm reactor, is filled
Volume ratio is 30%, and dissolved oxygen concentration is 2~4mg/L, hydraulic detention time 8h.Aerobic tank mixed liquor a part, which passes back into, to disappear
Oxygen pond, reflux ratio 3:1, another portion pass back into anoxic pond, reflux ratio 1:1.Aerobic tank water outlet enters primary sedimentation tank, through precipitating point
From rear, top clarified solution enters mixing pit, and lower part thickened sludge partial reflux enters to disappear oxygen pond, and reflux ratio 0.3:1 is partially discharged into
Sludge storage pool.Into mixing pit waste water add aluminium polychloride carry out dephosphorization, dosage 30mg/L, mixing pit be discharged into
Enter hole modulability fabric filter to be filtered.
After above-mentioned process, final outflow water CODcr, ammonia nitrogen, total nitrogen, total phosphorus meet respectively no more than 30mg/L,
The requirement of 1.5mg/L, 15mg/L and 0.3mg/L.
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (8)
1. a kind of regeneration water source recirculated cooling water blowdown method for treating water, which comprises the following steps:
(1) regeneration water source recirculated cooling water sewerage enters conditioning tank, carries out water quality equilibrium and runoff investigation；
(2) conditioning tank water outlet enters ozone oxidation pond after being filtered, and ozone oxidation bottom of pond portion is provided with micropore cloth gas cap,
Top is provided with ozone tail gas destructor, and ozone oxidation water outlet enters buffer pool；
(3) buffer pool water outlet enters the oxygen pond that disappears, and using activated sludge and biomembrane complex method, bottom of pond is provided with water distribution in the oxygen pond that disappears
Pipe；
(4) the oxygen pond water outlet that disappears enters anoxic pond, and anoxic pond is provided with water distribution using activated sludge and biomembrane complex method, bottom of pond
Pipe, and agitating device is set, outer carbon source is added in anoxic pond；
(5) anoxic pond water outlet enters aerobic tank, and aerobic tank uses moving bed biofilm reactor, and bottom of pond is provided with aerator,
Aerobic tank mixed liquor partial reflux is to oxygen pond and the anoxic pond of disappearing；
(6) aerobic tank water outlet enters primary sedimentation tank, and primary sedimentation tank top clarified solution enters mixing pit, lower part sludge reflux to the oxygen pond that disappears；
(7) Dephosphorization reagent is added in mixing pit, fabric filter is entered after hybrid reaction and is filtered to get processing water outlet.
2. regeneration water source recirculated cooling water blowdown method for treating water according to claim 1, which is characterized in that in step
(2) in, filter is self-cleaning filter.
3. regeneration water source recirculated cooling water blowdown method for treating water according to claim 1, which is characterized in that in step
(2) in~(3), the hydraulic detention time of the buffer pool is 0.5~1h.
4. regeneration water source recirculated cooling water blowdown method for treating water according to claim 1, which is characterized in that in step
(3) in~(4), biological rope is placed in the pond in the oxygen pond that disappears, material is polypropylene, vinylon or nylon, outside fiber
Fibrae circulares bundle is constituted, outer diameter is 20~45mm, and packing volume ratio is 20%~40%, and hydraulic detention time is 0.5~2h.
5. regeneration water source recirculated cooling water blowdown method for treating water according to claim 1, which is characterized in that in step
(4) in, filler has been added in the anoxic pond, filler packing volume ratio is 10%~30%, and outlet is provided with interception sieve.
6. regenerating water source recirculated cooling water blowdown method for treating water according to claim 1 or 5, which is characterized in that in step
Suddenly in (4), the outer carbon source added in anoxic pond is one of methanol, ethyl alcohol, acetic acid, sodium acetate, grape sugar and starch or several
Kind.
7. regeneration water source recirculated cooling water blowdown method for treating water according to claim 1, which is characterized in that in step
(5) in, aerobic tank use moving bed biofilm reactor, filler packing volume ratio be 20%~50%, density be 0.95~
0.98g/cm3, specific surface area >=500m2/m3, for bottom of pond aeration using micro-hole aerator or perforated pipe, upper outlet is provided with interception
Sieve.
8. regeneration water source recirculated cooling water blowdown method for treating water according to claim 1, which is characterized in that in step
(5) in, total reflux ratio that aerobic tank mixed liquor flows back into disappear oxygen pond and anoxic pond respectively is 1~5:1.
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Cited By (2)
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