CN103739156A - Method for performing biological denitrification of wastewater by using residual sludge and biological denitrification system for implementing same - Google Patents
Method for performing biological denitrification of wastewater by using residual sludge and biological denitrification system for implementing same Download PDFInfo
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Abstract
The invention discloses a method for performing biological denitrification on wastewater by using residual sludge and a biological denitrification system for implementing the method. The method comprises the steps of (1) performing sequencing batch internal circulation A/O biological denitrification on the wastewater to be treated, and taking the residual sludge discharged after denitrification; (2) performing ultrasonic treatment on the residual sludge to obtain a sludge mixed solution; (3) performing anaerobic fermentation on the sludge mixed solution to obtain fermentation broth, and refluxing the fermentation froth to the wastewater to be treated; and (4) repeating the steps (1)-(3). A filling material is added in an aerobic tank to improve the degradation efficiency of functional microbes to pollutants; tubificidae are loaded on the filling material to prey active sludge so as to realize effective reduction of the residual sludge; and the discharged residual sludge is further treated to obtain fermentation broth serving as a carbon source, so that an additional carbon source does not need to be added, the problem of insufficient denitrification carbon source is solved, and secondary reduction of the residual sludge is realized.
Description
Technical field
The invention belongs to Disposal Technology of Residual Sludge field, be specifically related to a kind of method of utilizing excess sludge to carry out wastewater biological denitrificaion and the biological denitrification system of implementing the method.
Background technology
Municipal effluent is processed the BOD that generally can only remove approximately 25～30 ℅ by the precipitator method
5, the colloid in sewage and dissolved organic matter can not utilize intermediate processing to remove, and chemical process should not adopt because medicament expense is very high and the effect of chemical coagulation removal dissolved organic matter is bad.Adopting biological treatment (activated sludge process) is to remove organic most economical the most effectively selection in waste water.
Nitrogen in waste water generally exists with four kinds of forms such as organonitrogen, ammonia nitrogen, nitrite nitrogen and nitrate nitrogens.In common sequence batch (internal recycle A/O biological denitrification process, anoxic pond, Aerobic Pond and second pond often need be set, utilize the effect of nitrobacteria in Aerobic Pond, by ammonia nitrogen by being converted into nitrite nitrogen, nitric nitrogen, utilize the effect of denitrifying bacterium in anoxic pond, nitrite nitrogen and nitric nitrogen are converted into nitrogen and overflow from waste water.
After Aerobic Pond is located at anoxic pond, can make the residual organism of denitrification further be removed, improve effluent quality.Anoxic pond, before Aerobic Pond, on the one hand because denitrification has consumed a part of carbon source organism, can alleviate the organic loading of Aerobic Pond, on the other hand, also can play the effect of biological selector, is conducive to control sludge bulking; Meanwhile, the basicity that denitrification process produces also can the consumption of compensated part nitrifying process to basicity.In anoxic pond-Aerobic Pond after internal recycle is repeatedly processed, water outlet, to second pond, is discharged after excess sludge sedimentation.
Initial several wheel processed the excess sludge that sedimentation goes out and can be back in anoxic pond or Aerobic Pond, supplements active mud content wherein.But through too much producing the excess sludge that cannot again utilize in a large number after wheel processing, along with wastewater treatment rate and emission standard improve day by day, excess sludge production and day sharp increase.Excess sludge treatment and disposal cost is very high, accounts for 40%～65% of municipal sewage plant's total expenses.With regard to Zhejiang Province, the annual excess sludge production of the whole province also position occupies the leading place in the whole country, and how so a large amount of excess sludges this dispose the focus that also becomes government department and investigator's concern.
Conventional excess sludge facture (as dehydration, burning and landfill etc.) is often costly or land occupation is many, and nonideal excess sludge is disposed approach.In recent years, studies have found that Annelita Oligochaeta Tubificidae merogenesis worm (being commonly called as Limnodrilus hoffmeisteri), the mud of ingesting in a large number, the food mud amount of every day can reach 8-9 times of own volume.Based on this feature, there is researchist that Limnodrilus hoffmeisteri is introduced in Sewage treatment systems, to process surplus mud, effectively reduce sludge discharge." Limnodrilus hoffmeisteri-microorganisms symbiosis " system sludge Decrement Technique is as the mud decrement new technology of a kind of low cost, efficient, non-secondary pollution, with its incomparable advantage gradually studied person pay close attention to.
It's a pity, research finds Limnodrilus hoffmeisteri to introduce after Sewage treatment systems, although realized the decrement discharge of mud, system denitrification effect but declines to some extent.Holland Ratsak etc. has carried out the Limnodrilus hoffmeisteri Sludge Reduction Technologies research of different process, discovery Limnodrilus hoffmeisteri is grown and is had the effect of mud decrement in Aerobic Pond, but because the metabolism of Limnodrilus hoffmeisteri makes nitrate, discharged in a large number, making to process water outlet nitrogen index substantially can not be up to standard.
But to make TN qualified discharge, be faced with again the problem of former water carbon source deficiency.And after Limnodrilus hoffmeisteri predation, excess sludge has subtracted appearance and has subtracted matter, is difficult to again for sewage disposal.To process excess sludge or adding outer carbon source all can increase the working cost of sewage work.Recycling how to realize excess sludge is the great difficult problem that current sewage disposal faces.
Summary of the invention
The invention provides a kind of method of utilizing excess sludge to carry out wastewater biological denitrificaion, to the excess sludge recycling of discharging in sequence batch (internal recycle A/O biological denitrification process.
Utilize excess sludge to carry out a method for wastewater biological denitrificaion, comprising:
(1) pending waste water is carried out to sequence batch (internal recycle A/O biological denitrificaion, get the excess sludge of discharge;
(2) described excess sludge is carried out to supersound process, obtain mud mixed liquid;
(3) described mud mixed liquid is carried out to anaerobically fermenting, after having fermented by fermentation liquor backflow in described pending waste water;
(4) repeating step (1)-(3).
Described sequence batch (internal recycle A/O biological denitrificaion is that pending waste water is passed in anoxic pond-Aerobic Pond, through being repeatedly disposed in second pond after internal recycle processing, treats excess sludge sedimentation, discharges.Supersound process makes part bacterial cell disruption in excess sludge, and large amount of organic, as strippings such as protein, polysaccharide, lipids, obtains mud mixed liquid; Again this mud mixed liquid is placed in to fermentor tank and carries out anaerobically fermenting, fermented in secondary fermentation liquid and contained a large amount of less materials of short chain fatty acid equimolecular quantity, these materials are as the carbon source of denitrifying bacterium in anoxic pond, solve the problem of denitrification process carbon source deficiency, in denitrification process, without adding Additional carbon sources, saved cost; Also for how to process excess sludge provide one effectively, the new way of environmental protection, realized the recycling to excess sludge.
In step (1), described pending waste water is first intake to anoxic pond, after consuming a part of carbon source, denitrifying bacterium in active sludge flow in Aerobic Pond, nitrite bacteria in active sludge and nitrobacteria are by aerobic nitrification effect, ammonia nitrogen in pending waste water is oxidized to nitrite nitrogen or nitrate nitrogen, obtains nitrification liquid; This Digestive system is back in anoxic pond, denitrifying bacterium is reduced to nitrite nitrogen and nitrate nitrogen nitrogen and overflows again.After repeatedly anoxic pond-Aerobic Pond internal recycle is processed, then water outlet is to second pond, after excess sludge sedimentation, discharges.
In anoxic pond and Aerobic Pond, each function yeast is constantly bred, and for controlling the content of active sludge, alleviates the processing load of subsequent step to excess sludge, in the present invention, in described Aerobic Pond, is hung with filler, carry Limnodrilus hoffmeisteri on described filler.Limnodrilus hoffmeisteri can be preyed on active sludge in a large number, realizes effective decrement of excess sludge.
It is the hollow out baton round of 7～9 centimetres that described filler can be selected diameter, accounting rate is housed is 30%～60% 40～100 order filter clothes in ball.If without specified otherwise, in the present invention, the accounting rate of filter cloth refers to that filter cloth occupies the ratio of baton round internal volume, and calculation formula is:
Accounting rate (%)=(filter cloth volume/baton round internal volume) × 100%.
If the accounting rate of the interior filter cloth of hollow out baton round is excessive or aperture is too small, Limnodrilus hoffmeisteri is difficult to activity, if the accounting rate of the interior filter cloth of hollow out baton round is too small or aperture is excessive, Limnodrilus hoffmeisteri is easily washed away.
As preferably, in 1L treatment sewage, the mount volume of described Limnodrilus hoffmeisteri is 2～10kg, more preferably 5kg.The residual cognition of the metabolic activity of Limnodrilus hoffmeisteri and the death of Limnodrilus hoffmeisteri increases the content of nitrate in Aerobic Pond, and therefore the mount volume of Limnodrilus hoffmeisteri is unsuitable too high, in order to avoid affect denitrification effect.
As further preferred, described Limnodrilus hoffmeisteri is Huo Fu water silk earthworm, positive tubificid and is mingled with at least one in band silk earthworm.These three kinds of Limnodrilus hoffmeisteri are comparatively general, and are of moderate size, and are convenient to carry.
As preferably, in step (2), the solid content of described excess sludge is 2～4%.Enrichment step is at conventional sludge thickener.If solid content is less than 2%, in excess sludge, water ratio is too high, makes the content of fermented liquid Short-Chain Fatty Acids on the low side, cannot meet the demand of denitrifying bacterium; If solid content is greater than 4%, need to adopt the equipment such as pressure filter to concentrate excess sludge, increased cost.
Preferably, in step (2), the ultrasonic frequency of described supersound process is 20～30KHz, and ultrasonic time is 15～20min.More preferably, ultrasonic frequency is 25KHz, and ultrasonic time is 15min.Under this supersound process condition, both guaranteed that the thalline in excess sludge can be all not broken, can make again bacterial cell disruption discharge enough organism, for anaerobically fermenting.
Preferably, in step (3), the condition of described anaerobically fermenting is: 20～30 ℃ of temperature, pH6～7,5～10 days time.When room temperature is 20～30 ℃, anaerobically fermenting temperature is controlled at room temperature, if room temperature is lower than 20 ℃, anaerobically fermenting temperature is controlled at 20 ℃, if room temperature higher than 30 ℃, anaerobically fermenting temperature is controlled at 30 ℃, so that control, be as the criterion, the control method of pH is identical with temperature.
The method of calculation of anaerobically fermenting time are: t=(7/3) * (T/pH)-(5/3), wherein t is fermentation number of days, and T is leavening temperature, and pH is fermentation pH.The concrete time can, according to sludge quality, be revised by on-the-spot lab scale.
Most preferably, the condition of described anaerobically fermenting is: 25 ℃ of temperature, pH6.5,6 days time.Under this fermentation condition, the organism in mud mixed liquid can be effectively degraded into the small molecules carbon sources such as short chain fatty acid.
To a certain extent, the quantity of reflux of fermented liquid is larger, and in waste water, carbon source is more sufficient, is more conducive to improve nitric efficiency.But quantity of reflux is crossed conference and caused COD to improve too much, is unfavorable for decarburization, can make on the contrary in water outlet COD content not up to standard.
As preferably, in step (3), the fermented liquid of backflow and the volume ratio of waste water are preferably 1～5:500, more preferably 1:200.After both mix under this volume ratio, the carbon source content such as waste water Short-Chain Fatty Acids are suitable, can meet the demand of denitrifying bacterium in anoxic pond, and nitric efficiency is the highest.
It is a kind of for implementing the wastewater biological denitrificaion system of described method that the present invention also provides, comprise the anoxic pond, Aerobic Pond and the second pond that connect successively, anoxic pond is provided with water-in, between Aerobic Pond and anoxic pond, be provided with internal reflux device, second pond is provided with water outlet and mud relief outlet, between mud relief outlet and water-in, be provided with excess sludge treatment unit, described excess sludge treatment unit comprises the sludge thickener, ultrasonic processor and the anaerobic fermentation tank that connect successively.
Anoxic pond, Aerobic Pond and second pond are the equipment in conventional A/O biological denitrification process, the present invention based on this, between mud relief outlet and water-in, be provided with excess sludge treatment unit, wherein, sludge thickener is for concentrating the excess sludge of discharging from second pond, making its solid content is 2～4%, in ultrasonic processor, the excess sludge after concentrated is carried out to supersound process, obtain mud mixed liquid, in anaerobic fermentation tank, mud mixed liquid is carried out to anaerobically fermenting, the fermentation liquor backflow obtaining is to anoxic pond or anoxic pond front end, mix with pending waste water, carry out A/O biological denitrificaion.
Compared with prior art, beneficial effect of the present invention is:
(1) on the basis of conventional sequence batch (internal recycle A/O biological denitrification process, in Aerobic Pond of the present invention, be added with filler, be conducive to extend the duration of contact of functional microorganism and pending waste water in active sludge, improve the degradation efficiency of functional microorganism to pollutent;
(2) the present invention's carry Limnodrilus hoffmeisteri on filler, utilizes Limnodrilus hoffmeisteri predation active sludge, realizes effective decrement of excess sludge;
(3) on the basis of excess sludge reduction; further the excess sludge of discharging is carried out obtaining fermented liquid as carbon source after a series of processing; without adding Additional carbon sources; the problem that has not only solved denitrifying carbon source deficiency, has improved biological denitrificaion efficiency, has also realized the secondary decrement of excess sludge; reduced the processing costs of excess sludge; cost-saving, protection of the environment, unnecessary fermented liquid can be used for agricultural pouring etc.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of biological denitrification method for wastewater of the present invention.
Embodiment
Embodiment 1
Wastewater biological denitrificaion system as shown in Figure 1, comprises the anoxic pond, Aerobic Pond and the second pond that connect successively, and anoxic pond is provided with water-in, is provided with whipping appts in anoxic pond; Aerobic Pond bottom is provided with boring aeration pipe, hangs hollow out baton round in Aerobic Pond, and filter cloth is housed in ball; Between Aerobic Pond and anoxic pond, be provided with internal reflux device, second pond is provided with water outlet and mud relief outlet, between Aerobic Pond and second pond, is provided with water quality testing meter; Between mud relief outlet and water-in, be connected with sludge thickener, ultrasonic processor and anaerobic fermentation tank in turn.
A kind of present embodiment method of utilizing excess sludge to carry out wastewater biological denitrificaion, is the wastewater biological denitrificaion system implementation that utilizes Fig. 1, comprises the following steps:
(1) get Canal in Hangzhou City section sanitary sewage (hereinafter to be referred as canal sewage), intake to anoxic pond, every crowd of water inlet 30L, controls the interior DO of anoxic pond at 0.4mg/L, reaction times 2h in anoxic pond;
Hang the hollow out baton round of diameter 8cm in Aerobic Pond, accounting rate is housed is 50% 70 order filter clothes in ball, carry Limnodrilus hoffmeisteri in filter cloth, the mount volume of Limnodrilus hoffmeisteri is 5kg/L canal sewage; Control the interior DO of Aerobic Pond at 4～6mg/L, after reaction 6h, nitrification liquid is back in anoxic pond, nitrification liquid reflux ratio (return flow/flooding velocity) is 100%, treats in nitrification liquid that total nitrogen content is lower than 30mg/L, in time, is expelled in second pond, water outlet after excess sludge sedimentation;
In the present embodiment, each wastewater flow rate of processing is less, and carries out in batches, so without carrying out sludge reflux, will be according to different waste water different designs if large continuous.
(2) excess sludge of step (1) sedimentation is transferred in sludge thickener, being concentrated into solid content is 4%; Transfer in ultrasonic reactor, ultrasonic 15min under 25KHz, obtains mud mixed liquid;
(3) mud mixed liquid is flowed in 10L anaerobic fermentation tank, anaerobically fermenting 6 days under 25 ℃, pH6.5, then by fermentation liquor backflow to anoxic pond front end, after the fermented liquid of backflow mixes with volume ratio 1:200 with canal sewage, then intake to anoxic pond;
(4) repeating step (1)-(3); Detect the content of COD, ammonia nitrogen and total nitrogen in water outlet.
Embodiment 2
A kind of present embodiment method of utilizing excess sludge to carry out wastewater biological denitrificaion, is also the wastewater biological denitrificaion system implementation that utilizes Fig. 1, comprises the following steps:
(1) get Canal in Hangzhou City section sanitary sewage (hereinafter to be referred as canal sewage), intake to anoxic pond, every crowd of water inlet 30L, controls the interior DO of anoxic pond at 15mg/L, reaction times 2h in anoxic pond;
Hang the hollow out baton round of diameter 7cm in Aerobic Pond, accounting rate is housed is 70% 40 order filter clothes in ball, carry Limnodrilus hoffmeisteri in filter cloth, the mount volume of Limnodrilus hoffmeisteri is 2kg/L canal sewage; Control the interior DO of Aerobic Pond at 4～6mg/L, after reaction 6h, nitrification liquid is back in anoxic pond, nitrification liquid reflux ratio (return flow/flooding velocity) is 100%, is expelled in second pond water outlet after excess sludge sedimentation when total nitrogen content is lower than 30mg/L in nitrification liquid;
(2) excess sludge of step (1) is transferred in sludge thickener, being concentrated into solid content is 2%; Transfer in ultrasonic reactor, ultrasonic 20min under 20KHz, obtains mud mixed liquid;
(3) mud mixed liquid is flowed in 10L fermentor tank, anaerobically fermenting 10 days under 20 ℃, pH7, then by fermentation liquor backflow to anoxic pond front end, after the fermented liquid of backflow mixes with volume ratio 1:500 with canal sewage, then intake to anoxic pond;
(4) repeating step (1)-(3); Detect the content of COD, ammonia nitrogen and total nitrogen in water outlet.
Embodiment 3
A kind of present embodiment method of utilizing excess sludge to carry out wastewater biological denitrificaion, is also the wastewater biological denitrificaion system implementation that utilizes Fig. 1, comprises the following steps:
(1) get Canal in Hangzhou City section sanitary sewage (hereinafter to be referred as canal sewage), intake to anoxic pond, every crowd of water inlet 30L, controls the interior DO of anoxic pond at 0.4mg/L, reaction times 2h in anoxic pond;
Hang the hollow out baton round of diameter 7cm in Aerobic Pond, accounting rate is housed is 60% 40 order filter clothes in ball, carry Limnodrilus hoffmeisteri in filter cloth, the mount volume of Limnodrilus hoffmeisteri is 2kg/L canal sewage; Control the interior DO of Aerobic Pond at 4～6mg/L, after reaction 6h, nitrification liquid is back in anoxic pond, nitrification liquid reflux ratio (return flow/flooding velocity) is 100%, is expelled in second pond water outlet after excess sludge sedimentation when total nitrogen content is lower than 30mg/L in nitrification liquid;
(2) excess sludge of step (1) is transferred in sludge thickener, being concentrated into solid content is 2%; Transfer in ultrasonic reactor, ultrasonic 15min under 30KHz, obtains mud mixed liquid;
(3) mud mixed liquid is flowed in 10L fermentor tank, anaerobically fermenting 5 days under 30 ℃, pH7, then by fermentation liquor backflow to anoxic pond front end, after the fermented liquid of backflow mixes with volume ratio 1:500 with canal sewage, then intake to anoxic pond;
(4) repeating step (1)-(3); Detect the content of COD, ammonia nitrogen and total nitrogen in water outlet.
Embodiment 4
A kind of present embodiment method of utilizing excess sludge to carry out wastewater biological denitrificaion, is also the wastewater biological denitrificaion system implementation that utilizes Fig. 1, comprises the following steps:
(1) get Canal in Hangzhou City section sanitary sewage (hereinafter to be referred as canal sewage), intake to anoxic pond, every crowd of water inlet 30L, in anoxic pond, DO is controlled at 0.4mg/L, reaction times 2h in anoxic pond;
Hang the hollow out baton round of diameter 8cm in Aerobic Pond, accounting rate is housed is 50% 120 order filter clothes in ball, carry Limnodrilus hoffmeisteri in filter cloth, the mount volume of Limnodrilus hoffmeisteri is 1kg/L canal sewage; In Aerobic Pond, DO is controlled at 4～6mg/L, after reaction 6h, nitrification liquid is back in anoxic pond, nitrification liquid reflux ratio (return flow/flooding velocity) is 100%, is expelled in second pond water outlet after excess sludge sedimentation when total nitrogen content is lower than 30mg/L in nitrification liquid;
(2) excess sludge of step (1) is transferred in sludge thickener, being concentrated into solid content is 1%; Transfer in ultrasonic reactor, ultrasonic 5min under 10KHz, obtains mud mixed liquid;
(3) mud mixed liquid is flowed in 10L fermentor tank, anaerobically fermenting 5 days under 15 ℃, pH5, then by fermentation liquor backflow to anoxic pond front end, after the fermented liquid of backflow mixes with volume ratio 3:200 with canal sewage, then intake to anoxic pond;
(4) repeating step (1)-(3); Detect the content of COD, ammonia nitrogen and total nitrogen in water outlet.
Embodiment 5
A kind of present embodiment method of utilizing excess sludge to carry out wastewater biological denitrificaion, is also the wastewater biological denitrificaion system implementation that utilizes Fig. 1, comprises the following steps:
(1) get the emerald green garden sanitary sewage in Hangzhou (hereinafter to be referred as emerald green garden sewage), intake to anoxic pond, every crowd of water inlet 30L, in anoxic pond, DO is controlled at 0.4mg/L, reaction times 2h in anoxic pond;
Hang the hollow out baton round of diameter 8cm in Aerobic Pond, accounting rate is housed is 50% 120 order filter clothes in ball, carry Limnodrilus hoffmeisteri in filter cloth, the mount volume of Limnodrilus hoffmeisteri is the emerald green garden of 5kg/L sewage; In Aerobic Pond, DO is controlled at 4～6mg/L, after reaction 6h, nitrification liquid is back in anoxic pond, nitrification liquid reflux ratio (return flow/flooding velocity) is 100%, is expelled in second pond water outlet after excess sludge sedimentation when total nitrogen content is lower than 30mg/L in nitrification liquid;
(2) excess sludge of step (1) sedimentation is transferred in sludge thickener, being concentrated into solid content is 4%; Transfer in ultrasonic reactor, ultrasonic 15min under 25KHz, obtains mud mixed liquid;
(3) mud mixed liquid is flowed in 10L fermentor tank, anaerobically fermenting 6 days under 25 ℃, pH6.5, then by fermentation liquor backflow to anoxic pond front end, after the fermented liquid Yu Cui garden sewage of backflow mixes with volume ratio 1:200, then intake to anoxic pond;
(4) repeating step (1)-(3); Detect the content of COD, ammonia nitrogen and total nitrogen in water outlet.
Comparative example 1
A kind of present embodiment method of utilizing excess sludge to carry out wastewater biological denitrificaion, is also the wastewater biological denitrificaion system implementation that utilizes Fig. 1, but carry Limnodrilus hoffmeisteri not in Aerobic Pond comprises the following steps:
(1) get the emerald green garden sanitary sewage in Hangzhou (hereinafter to be referred as emerald green garden sewage), intake to anoxic pond, every crowd of water inlet 30L, in anoxic pond, DO is controlled at 0.4mg/L, reaction times 2h in anoxic pond;
In Aerobic Pond, DO is controlled at 4～6mg/L, after reaction 6h, nitrification liquid is back in anoxic pond, nitrification liquid reflux ratio (return flow/flooding velocity) is 100%, is expelled in second pond water outlet after excess sludge sedimentation when total nitrogen content is lower than 30mg/L in nitrification liquid;
(2) excess sludge of step (1) sedimentation is transferred in sludge thickener, being concentrated into solid content is 4%; Transfer in ultrasonic reactor, ultrasonic 15min under 25KHz, obtains mud mixed liquid;
(3) mud mixed liquid is flowed in 10L fermentor tank, anaerobically fermenting 6 days under 25 ℃, pH6.5, then by fermentation liquor backflow to anoxic pond front end, after the fermented liquid Yu Cui garden sewage of backflow mixes with volume ratio 1:200, then intake to anoxic pond;
(4) repeating step (1)-(3); Detect the content of COD, ammonia nitrogen and total nitrogen in water outlet.
Comparative example 2
The method of a kind of wastewater biological denitrificaion of present embodiment, is conventional A/O biological denitrification method, comprises the following steps:
(1) get Canal in Hangzhou City section sanitary sewage, intake to anoxic pond, every crowd of water inlet 30L, in anoxic pond, DO is controlled at 0.4mg/L, reaction times 2h in anoxic pond;
In Aerobic Pond, DO is controlled at 4～6mg/L, after reaction 6h, nitrification liquid is back in anoxic pond, nitrification liquid reflux ratio (return flow/flooding velocity) is 100%, is expelled in second pond water outlet after excess sludge sedimentation when total nitrogen content is lower than 30mg/L in nitrification liquid; Detect the content of COD, ammonia nitrogen and total nitrogen in water outlet.
Detect in each embodiment the content of COD, ammonia nitrogen and total nitrogen before processing, in waste water after treatment, surplus sludge volume after treatment, and nitric efficiency relatively.
The nitric efficiency comparison of waste water in the each embodiment of table 1
Note: the corresponding comparative example 1～2 of 1～5 corresponding embodiment 1～5,6～7; Nitric efficiency is nitrogen removal rate.
From table 1, earthworm content is higher, and surplus sludge volume is fewer, still, due to the metabolic process of earthworm, can cause water body COD slightly to raise, and therefore the mount volume of earthworm need to be controlled at 2kg/L left and right; Within the specific limits, ultrasonic time is longer, and in mud mixed liquid, the amount of organism stripping is larger, is more conducive to the carrying out of fermentation; Fermentation is at 25 ℃, and during pH meta-acid, ferment effect is best; And within the specific limits, fermentation secondary fermentation liquid quantity of reflux is large, can improve C/N ratio, improve nitric efficiency, but quantity of reflux too conference cause COD to improve too much, be unfavorable for decarburization.
Claims (9)
1. utilize excess sludge to carry out a method for wastewater biological denitrificaion, comprising:
(1) pending waste water is carried out to sequence batch (internal recycle A/O biological denitrificaion, get the excess sludge of discharge;
(2) described excess sludge is carried out to supersound process, obtain mud mixed liquid;
(3) described mud mixed liquid is carried out to anaerobically fermenting, after having fermented by fermentation liquor backflow in described pending waste water;
(4) repeating step (1)-(3).
2. the method for claim 1, is characterized in that, the solid content of described excess sludge is 2～4%.
3. the method for claim 1, is characterized in that, the ultrasonic frequency of described supersound process is 20～30KHz, and ultrasonic time is 15～20min.
4. the method for claim 1, is characterized in that, the condition of described anaerobically fermenting is: 20～30 ℃ of temperature, pH6～7,5～8 days time.
5. the method for claim 1, is characterized in that, the fermented liquid of backflow and the volume ratio of waste water are 1～5:500.
6. method as claimed in claim 5, is characterized in that, the fermented liquid of backflow and the volume ratio of waste water are 1:200.
7. the method as described in as arbitrary in claim 1～6, is characterized in that, described sequence batch (internal recycle A/O biological denitrificaion is that pending waste water is passed in anoxic pond-Aerobic Pond, through internal recycle repeatedly, after processing, is disposed in second pond, treats excess sludge sedimentation, discharges; In described Aerobic Pond, be hung with filler, carry Limnodrilus hoffmeisteri on described filler.
8. method as claimed in claim 7, is characterized in that, described Limnodrilus hoffmeisteri is Huo Fu water silk earthworm, positive tubificid and is mingled with at least one in band silk earthworm.
9. a wastewater biological denitrificaion system, comprise the anoxic pond, Aerobic Pond and the second pond that connect successively, anoxic pond is provided with water-in, between Aerobic Pond and anoxic pond, be provided with internal reflux device, second pond is provided with water outlet and mud relief outlet, it is characterized in that, be provided with excess sludge treatment unit between mud relief outlet and water-in, described excess sludge treatment unit comprises the sludge thickener, ultrasonic processor and the anaerobic fermentation tank that connect successively.
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| CN104386815A (en) * | 2014-12-09 | 2015-03-04 | 南京林业大学 | Sewage denitrification method |
| CN105502655A (en) * | 2014-10-16 | 2016-04-20 | 中国石油化工股份有限公司 | Method utilizing active sludge to process salt containing wastewater |
| CN105906052A (en) * | 2016-06-08 | 2016-08-31 | 广东省工程技术研究所 | Coupling anaerobic sludge acidogenesis mud-film two-phase composite A/A/O system and technology |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105502655A (en) * | 2014-10-16 | 2016-04-20 | 中国石油化工股份有限公司 | Method utilizing active sludge to process salt containing wastewater |
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| CN111333446A (en) * | 2020-03-09 | 2020-06-26 | 广州市环境保护工程设计院有限公司 | Resourceful treatment system and method for sludge |
| CN112174317A (en) * | 2020-07-20 | 2021-01-05 | 北京工业大学 | Device and method for side flow enhanced biological phosphorus removal process based on carbon source development in excess sludge |
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