CN105461155A - Advanced treatment process of sewage - Google Patents
Advanced treatment process of sewage Download PDFInfo
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- CN105461155A CN105461155A CN201410439905.9A CN201410439905A CN105461155A CN 105461155 A CN105461155 A CN 105461155A CN 201410439905 A CN201410439905 A CN 201410439905A CN 105461155 A CN105461155 A CN 105461155A
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Abstract
The invention discloses an advanced treatment process of sewage. The process is a combined process where an efficient settling pond is additionally arranged between a secondary sedimentation tank and a disinfecting tank of an original process of a sewage treatment plant with a vertical fiber filter cloth filter tank. The efficient settling pond is composed of two modules: a rapid mixing region and an efficient settling region; in the rapid mixing region, a FeCl3 agent is input to be stirred and reacted with sewage, wherein the input amount of the FeCl3 agent is 5-8 mg/L, and the standing time in the rapid mixing region is 1.5-2 minutes; the standing time in the efficient settling pond is 15-20 minutes; the standing time in the vertical fiber filter cloth filter tank is 8-12 minutes; effluent in the secondary sedimentation tank is firstly treated in the efficient settling pond, is then treated in the vertical fiber filter cloth filter tank, and is finally treated in the disinfecting pond. The process disclosed by the invention effectively solves the problems that SS in the effluent is unstable as the efficient settling pond process is independently used and phosphorous cannot be removed as the filter cloth filter tank is independently used, so that the dosing cost is greatly lowered, and contamination on a probe of an online monitoring instrument by inputting PAM is avoided.
Description
Technical field
The invention belongs to environmental technology field, relate to a kind of sewerage advanced treatment process.
Background technology
The ripe technical process of existing municipal wastewater process is: water inlet → coarse rack → fine fack → settling pit (preliminary sedimentation tank) → biochemical reaction tank → second pond → sterilization pool → water outlet, this technique can only reach original one-level B standard effluent index, present one-level A standard effluent index can not be reached, cannot meet and propose the effluent quality requirement after being marked with, reason is:
1, existing municipal wastewater processing item mainly relies on the phosphorus bacterium that bites in biochemical process section sewage to be enriched in mud by the phosphorus in sewage for the technique of dephosphorization, then enters sedimentation in secondary sedimentation tank, removes with the form of excess sludge.The shortcoming of this method dephosphorization is: along with influent quality fluctuation, and phosphor-removing effect is also unstable, cannot meet the effluent index of 0.5mg/L; If the excess sludge residence time is longer, the phosphorus in mud can discharge again.
2, in existing municipal wastewater processing item removal water, technique+two gravitational settling methods of sinking of mainly just sinking of suspended particulate (SS) are removed.The dewater shortcoming of middle suspended particulate (SS) of this method is: sewage in water after twice precipitation, still have a large amount of proportion and water is close, particle diameter at the suspended particulate of 10 ~ 100um, these suspended substances cannot be removed by the method for gravitational settling.Suspended particulate (SS) is caused in the water in sewage to be just difficult to afterwards eliminate dropping to certain value (usually at about 20mg/L).
High-rate sedimentation pool process and filtering cloth filtering pool technique all have a large amount of actual motion cases as independently sewage treatment process in sewage treatment industry, and are all the advanced treatment process in respective field.
The principle of work of efficient sedimentation tank is by successively adding coagulant aids (as PAC) and flocculation agent (as PAM) stirring, soluble phosphate in sewage (PO43-) and Fe3+ or Al3+ are fully reacted, forms FePO4 ↓ and AlPO4 ↓ and form floc sedimentation, accelerate the process of precipitation.Suspended substance in water controls at about 80mg/L by the treatment process of---stirring---precipitation that usually designs the preliminary sedimentation tank position at sewage treatment process when this technique is used alone, by dosing, and effectively can control the total P content in water.But this method cannot remove proportion in water and water is close, particle diameter is at the suspended particulate of 10 ~ 100um, therefore between second pond and sterilization pool, be used alone the words of High-rate sedimentation pool process, although the municipal one-level A index of water outlet total P content≤0.5mg/L can be stablized, but water outlet suspended particulate (SS) content because of the impact of the environmental factorss such as the fluctuation of water quality, the water yield and weather, can cannot be stabilized in below 10mg/L.In addition, for guaranteeing that effluent quality is up to standard, often need when being used alone efficient sedimentation tank excessively to add medicament, operation like this not only can cause the waste of medicament; Excessive adds the viscosity that PAM flocculation agent can increase water quality, and the equipment flowed through is more prone to adhere to dirt, the equipment of rear end, instrument (as effluent quality monitoring instrument etc.) is popped one's head in more easily stained.
The principle of work in riser fiber filter cloth filter tank effluent stream is crossed the filter cloth of high compactness, utilizes filter cloth to retain, suspended substance in absorption effluent, thus reach reduction, stablize the object of SS in water.Because existing Sewage Plant substantially all needs to carry out dephosphorization by dosing, this process can make the SS in water raise, if be used alone the advanced treatment process of filtering cloth filtering pool as Sewage Plant, filter cloth can rinse filter cloth frequently because water inlet SS is higher, service efficiency and the life-span in filter tank can be reduced like this, rinse the running cost that also can increase technique frequently simultaneously.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, there is provided one can solve dephosphorization and this two hang-up of oil removal in former technique simultaneously, dosing cost can be reduced, and can avoid adding PAM and cause stained sewage disposal to carry mark transformation sewerage advanced treatment process to on-line monitoring instrument probe.
Technical scheme of the present invention is as follows:
It is as follows that mark transformation sewerage advanced treatment process is carried in a kind of sewage disposal: water inlet → coarse rack → fine fack → settling pit (preliminary sedimentation tank) → biochemical reaction tank → second pond → efficient sedimentation tank → riser fiber filter cloth filter tank → sterilization pool → water outlet, namely by the former technique of sewage work: based on water inlet → coarse rack → fine fack → settling pit (preliminary sedimentation tank) → biochemical reaction tank → second pond → sterilization pool → water outlet, increase the combination process in one section of efficient sedimentation tank+riser fiber filter cloth filter tank between the second pond and sterilization pool of former technique;
Described efficient sedimentation tank is made up of short mix district and 2, High-rate sedimentation district functional module; In short mix district, add FeCl3 medicament and sewage stirring reaction, FeCl3 added amount of chemical is 5 ~ 8mg/L; Sewage is at the residence time 1.5 ~ 2min in short mix district; Sewage is 15 ~ 20min in the residence time in High-rate sedimentation district;
The residence time of sewage in riser fiber filter cloth filter tank is 8 ~ 12min;
Secondary clarifier effluent is first through efficient sedimentation tank process, process through riser fiber filter cloth filter tank again, after sterilization pool, the total TP content≤0.5mg/L of water outlet, ss suspended solid≤10mg/L, COD≤50mg/L, indices all can reach sewage disposal one-level emission standard A (i.e. " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level A standard).The pond body of 2 groups of parallel connections is designed in riser fiber filter cloth filter tank, often organizes the pond body residence time 4 ~ 6min.
Beneficial effect of the present invention:
Mark transformation sewerage advanced treatment process is carried in sewage disposal of the present invention, for former technique dephosphorization and oil removal effect this present situation bad, have employed the back segment at traditional municipal wastewater treatment process (water inlet → coarse rack → fine fack → settling pit (preliminary sedimentation tank) → biochemical reaction tank → second pond → sterilization pool → water outlet)---increase the combination process (that is: water inlet → coarse rack → fine fack → settling pit (preliminary sedimentation tank) → biochemical reaction tank → second pond → efficient sedimentation tank → riser fiber filter cloth filter tank → sterilization pool → water outlet) in one section of efficient sedimentation tank+riser fiber filter cloth filter tank between second pond and sterilization pool, by the improvement of technique, solve dephosphorization and these two problems up to standard the most difficult of oil removal in former technique.Meanwhile, the novel process that efficient sedimentation tank+riser fiber filter cloth filter tank is combined by the present invention, efficiently solve High-rate sedimentation pool process be used alone that the unstable and filtering cloth filtering pool of water outlet SS is used alone cannot the problem of dephosphorization.
Sewage disposal of the present invention is carried mark transformation sewerage advanced treatment process (efficient sedimentation tank+riser fiber filter cloth filter tank combination process) tool and is had the following advantages:
1, only make an amendment for former project last part technology, do not need to change whole technical process (that is: water inlet → coarse rack → fine fack → settling pit (preliminary sedimentation tank) → biochemical reaction tank → second pond → efficient sedimentation tank → riser fiber filter cloth filter tank → sterilization pool → water outlet.Only need to change the pipeline between second pond to sterilization pool in transformation project.)
2, by the mode dephosphorization of dosing+stirring precipitation, chemical feeding quantity can be regulated according to practical situation.Usually the FeCl3 solution that mass concentration is 2% ~ 5% is added, the dosage of FeCl3 solution is according to the concrete water quality of project, the water yield and determining, the dosage of the FeCl3 solution of usual 2% ~ 5% is 3 ~ 5% of sewage volume, and water outlet phosphorus content Absorbable organic halogens is at below 0.5mg/L.
3, after efficient sedimentation tank is combined with riser fiber filter cloth filter tank, it is larger that the function of efficient sedimentation tank in removal water in suspended substance only needs to consider to remove particle diameter, the suspended substance of free settling, can suitably shorten when designing the residence time of settling tank like this, thus the pond of reducing efficient sedimentation tank holds, reduce civil engineering cost (when being usually used alone efficient sedimentation tank as advanced treatment process, the design residence time after dosing stirring all will at more than 30min, and after efficient sedimentation tank is combined with riser fiber filter cloth filter tank, the design residence time only needs at 15 ~ 20min.) work of removing the not suspended substance of free settling in water come by follow-up riser fiber filter cloth filter tank, after fiber filter cloth adsorption filtration, in water, suspended substance (SS) can be stabilized in below 10mg/L.
4, after efficient sedimentation tank being combined with riser fiber filter cloth filter tank, originally becoming no longer needed for coagulation, the PAM that accelerate precipitation, avoid add PAM to on-line monitoring instrument pop one's head in stained.
The PAC that 5, originally will add can make the cheaper FeCl3 of price into, because after efficient sedimentation tank is combined with riser fiber filter cloth filter tank, just not need PAC help solidifying in purposes, only need the chemical feeding quantity considering dephosphorization when adding medicament simultaneously, and need not add after amount the medicament accelerating suspended substance flocculation sediment in water, greatly reduce dosing cost.
Embodiment
The present invention is further illustrated below.
Embodiment 1
Mark transformation sewerage advanced treatment process is carried in a kind of sewage disposal of the present invention, it is by former technique: based on water inlet → coarse rack → fine fack → settling pit (preliminary sedimentation tank) → biochemical reaction tank → second pond → sterilization pool → water outlet, increase the combination process in one section of efficient sedimentation tank+riser fiber filter cloth filter tank between the second pond and sterilization pool of former technique.
Certain sewage work's sewage disposal scale 40,000 tons/day, variation factor 1.2, design maximum treatment capacity 4.8 ten thousand tons/day, effluent quality requires to reach one-level A standard.
The original design efficient sedimentation tank of selecting of this project as the treatment process after secondary clarifier effluent,
Design influent quality: COD≤60mg/L, SS≤30mg/L, TP≤2mg/L;
Design effluent quality: COD≤50mg/L, SS≤10mg/L, TP≤0.5mg/L.
Intrinsic efficient sedimentation tank is divided into 3 functional modules: rapidly miscible pool+flocculation tank+efficient sedimentation tank.
Rapidly miscible pool design residence time 2min, size 4.2m × 4.2m × 4.9m;
Flocculation tank design residence time 11min, size 8.8m × 7.0m × 7.1m;
Efficient sedimentation tank uses inclined tube-type precipitation, controls upflow velocity at 12-18m/h, design residence time 35min, size 14.0m × 14.0m × 7.1m.
The investment of project in equipment about 1,300,000 yuan, installed power 56kw, ton water power consumption 0.026kw, adds medicament and is respectively PAC (15 ~ 20mg/L) and PAM (0.7 ~ 2mg/L), regulate according to former regimen condition and the fluctuation of water outlet total phosphorus, ton water medicine consumption about 0.15 yuan.(wherein PAC unit price about 5000 yuan/ton, PAM unit price about 56000 yuan/ton)
This project now uses efficient sedimentation tank+riser fiber filter cloth filter tank combination process process instead: originally design the PAM medicament added and become and no longer need, and the reaction times that the stirring reaction time contrast adding FeCl3 adds PAM want short many (FeCl3 along with adding of solution instant, it is generally acknowledged the time < 10S adding FeCl3 and react while stirring), therefore mixing functions can be completed in rapidly miscible pool, former efficient sedimentation tank flocculation reaction functional module can be cancelled, the pond body bulk in intrinsic flocculation reaction district can all save (that is: the 11min residence time shortening design flocculation reaction), simultaneously, because this part work of removing suspended substance in water has come primarily of follow-up riser fiber filter cloth filter tank, the precipitating action played is needed greatly to reduce in efficient sedimentation tank, therefore the pond in High-rate sedimentation district holds and can reduce 1/3 ~ 1/2, and the residence time foreshortens to 15 ~ 20min by original more than 30min, the design residence time of design rapidly miscible pool only needs to consider that pond holds size and enough places agitator, and the design residence time ranges of rapidly miscible pool is 1.5 ~ 2min.Efficient sedimentation tank subsequent technique---riser fiber filter cloth filter tank, designs the pond body of the size 12.0m × 4.0m × 3.1m of 2 groups of parallel connections, often organizes pond body residence time 6min.
When efficient sedimentation tank is used as Sewage Plant advanced treatment process section or put forward mark improvement and design, its front end water inlet and secondary clarifier effluent are normally according to premised on satisfied municipal one-level B standard.Before and after this project reconstruction, water outlet indices all can meet and be stabilized in municipal water outlet one-level A index, namely reaches " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level A standard.
When transformation project is run, generally in the short mix district of efficient sedimentation tank, add the FeCl3 solution stirring reaction that mass concentration is 2% ~ 5%, the dosage of FeCl3 solution is according to the concrete water quality of project, the water yield and determining, generally, the dosage of the FeCl3 solution of mass concentration 2% ~ 5% is 3 ~ 5% of sewage volume; And in practical engineering application, normally choose the FeCl3 commercial solution of mass concentration 30%, directly add in the short mix stirring area of efficient sedimentation tank by dosing pump, although add better effects if again because first dilute, but need additionally to increase equipment investment (air mix facilities, cache pool etc.) and running cost (diluting water, pump horsepower strengthen).
Can find out according to above-mentioned modification scheme, although use the contrast of the combination process in efficient sedimentation tank+riser fiber filter cloth filter tank to be used alone High-rate sedimentation pool process will make filter tank structures more, but, can find from the total residence time of sewage, (being used alone High-rate sedimentation pool process total residence time is: 2min+11min+35min=48min; Use efficient sedimentation tank+riser fiber filter cloth filter tank combination process total residence time is: 2min+20min+6 × 2min=34min), in sewage process section after combining, the residence time does not increase, reduce significantly on the contrary, illustrate that the total pond of technique after improving holds less, civilwork engineering quantity is lower.
Facility investment after retrofit scheme about 2,000,000 yuan, installed power is still about 56kw, and ton water power consumption 0.026kw, adds medicament and change FeCl3 (5 ~ 8mg/L) into, regulates, ton water medicine consumption about 0.03 yuan according to former regimen condition and the fluctuation of water outlet total phosphorus.(FeCl3 solid unit price about 3500 yuan/ton)
Sum up: contrast visible, although use the combination process in efficient sedimentation tank+riser fiber filter cloth filter tank can increase in facility investment, but the contrast of the design residence time of whole technique does not only increase with the process program of efficient sedimentation tank, reduce to some extent on the contrary, consider that the pond dark more efficient settling tank in riser fiber filter cloth filter tank is shallow simultaneously, the pond body wall in filter tank is thick thin, therefore the amount of concrete that the structures that same pond holds need and quantity of reinforcement all will lack, difficulty of construction also can decline, therefore efficient sedimentation tank is reduced and the scheme increasing riser fiber filter cloth filter tank is more reasonably select on civilwork engineering quantity, in addition, the object of efficient sedimentation tank dosing adds precipitation function by original dephosphorization and has changed simple dephosphorization into, and amount and the kind of dosing reduce all to some extent, greatly reduce operating dosing cost.
More than to invention has been exemplary description; obvious realization of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that technical solution of the present invention is carried out; or design of the present invention and technical scheme directly applied to other occasion, all in protection scope of the present invention without to improve.
Claims (3)
1. a sewerage advanced treatment process, it is characterized in that, by the former technique of sewage work: based on water inlet → coarse rack → fine fack → preliminary sedimentation tank → biochemical reaction tank → second pond → sterilization pool → water outlet, increase the combination process in one section of efficient sedimentation tank+riser fiber filter cloth filter tank between the second pond and sterilization pool of former technique;
Described efficient sedimentation tank is made up of short mix district and 2, High-rate sedimentation district functional module; In short mix district, add FeCl3 medicament and sewage stirring reaction, FeCl3 added amount of chemical is 5 ~ 8mg/L; Sewage is at the residence time 1.5 ~ 2min in short mix district; Sewage is 15 ~ 20min in the residence time in High-rate sedimentation district;
The residence time of sewage in riser fiber filter cloth filter tank is 8 ~ 12min;
Secondary clarifier effluent first through efficient sedimentation tank process, then processes through riser fiber filter cloth filter tank, after sterilization pool, and water outlet water outlet TP content≤0.5mg/L, ss suspended solid≤10mg/L, COD≤50mg/L.
2. a kind of sewerage advanced treatment process according to claim 1, is characterized in that, the pond body of 2 groups of parallel connections is designed in riser fiber filter cloth filter tank, often organizes the pond body residence time 4 ~ 6min.
3. a kind of sewerage advanced treatment process according to claim 1 and 2, is characterized in that, efficient sedimentation tank uses inclined tube-type precipitation, controls upflow velocity at 12-18m/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410439905.9A CN105461155A (en) | 2014-09-01 | 2014-09-01 | Advanced treatment process of sewage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410439905.9A CN105461155A (en) | 2014-09-01 | 2014-09-01 | Advanced treatment process of sewage |
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| CN105461155A true CN105461155A (en) | 2016-04-06 |
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| CN201410439905.9A Pending CN105461155A (en) | 2014-09-01 | 2014-09-01 | Advanced treatment process of sewage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830404A (en) * | 2017-03-24 | 2017-06-13 | 苏州林信源自动化科技有限公司 | A kind of water treatment facilities of many filters |
| CN107585954A (en) * | 2017-09-20 | 2018-01-16 | 苏州科技大学 | Suitable sewage plant carries the sewage water treatment method of mark transformation |
-
2014
- 2014-09-01 CN CN201410439905.9A patent/CN105461155A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830404A (en) * | 2017-03-24 | 2017-06-13 | 苏州林信源自动化科技有限公司 | A kind of water treatment facilities of many filters |
| CN107585954A (en) * | 2017-09-20 | 2018-01-16 | 苏州科技大学 | Suitable sewage plant carries the sewage water treatment method of mark transformation |
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Application publication date: 20160406 |