CN102336498A - Nitrogen-phosphorus wastewater treating method by sequencing batch reactor coupled photobioreactor - Google Patents
Nitrogen-phosphorus wastewater treating method by sequencing batch reactor coupled photobioreactor Download PDFInfo
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Abstract
The invention relates to the field of environmental wastewater treatment, specifically to a nitrogen-phosphorus wastewater treating method by a sequencing batch reactor coupled photobioreactor. The method provided by the invention is characterized in that it comprises the following steps of: removing impurities and sediments of high concentration nitrogen-phosphorus wastewater and then treating the wastewater by using active sludge in the sequencing batch reactor, decanting a supernatant from the sequencing batch reactor, adding the supernatant into a membrane bioreactor for further aerobic treatment, filtering by ultrafiltration membrane in the membrane bioreactor to remove micro-suspension and bacteria, adding a generated ultrafiltration supernatant into a photobioreactor, disinfecting by ozone and adding algae filament as well as a few necessary nutrient salt, filling with carbon dioxide waste gas to perform microalgae cultivation, discharging a algae liquid after a microalgae growth cycle and adding the algae liquid into a flocculating settling pool for sedimentation, standardly discharging or reusing a supernatant liquor, compressing the concentrate algae liquid at the bottom into a microalgae cake by a plate and frame filter press. The invention has advantages of wide range of treated nitrogen-phosphorus wastewater water quality variation and production of economical microalgae with the utilization of nitrogen and phosphorus nutrients in wastewater as more as possible.
Description
[technical field]
The present invention relates to the environment protection sewage process field, specifically a kind of method of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater.
[background technology]
Body eutrophication is meant the too much caused water pollution phenomenons of plant nutrient substance content such as nitrogen, phosphorus.Body eutrophication has restricted lake drainage regional economy and social sustainable development, has become one of global serious ecological environment problem.High concentration N-P sewage such as livestock and poultry cultivation ight soil are the one of the main reasons that causes body eutrophication with the discharging of flushing sewage, human feces sewage, nitrogen fertilizer plant's sewage, Gourmet Powder Factory's sewage, bean product source mill sewage, sewage plant sludge supernatant and filtrating etc.Yet high concentration N-P sewage is source of pollution, also is a kind of resource that can develop.
Because the nitrated/denitrification process of conventional processing high concentration N-P sewage need add expensive carbon sources such as methyl alcohol, glucose usually; Under the insufficient situation of carbon source; COD (COD) can be up to standard often; Nitrogen phosphorus then is difficult to up to standard, still contains nutritive substances such as more nitrogen, phosphorus in the water outlet, causes body eutrophication easily.In addition; SBR, Anammox technology commonly used are the effects through nitrifier; With ammonia nitrogen through nitrated nitrite nitrogen, the nitric nitrogen of being converted into; And then utilize denitrifying bacteria that nitric nitrogen is converted into nitrogen, reach the purpose of denitrogenation from waste water, yet this mode has directly caused the loss of nitrogenous fertilizer; And the means of dephosphorization are very limited especially, and phosphor-removing effect is not ideal.
In view of the high nutritive value of economic little algae, to the sorption of nitrogen phosphorus; In bioreactor, utilize nitrogen, the little algae of phosphorus nutrition composition culturing economic in the nitrogen-phosphorus wastewater; Make high little algae slurry or microalgae powder and the deep processed product thereof of nutritive value after gathering; Both administer the eutrophication pollution problem of nitrogen-phosphorus wastewater, produced economic little algae product of animal, human needs again.Yet; The condition of the little algae of culturing economic is relatively harsher; And the situation of nitrogen-phosphorus wastewater is ever-changing; Unprocessed and be not suitable for cultivating microalgae, need carry out pre-treatment targetedly to intending the nitrogen-phosphorus wastewater that utilizes, just can be used for cultivating microalgae after making the physical and chemical index of sewage meet the basic demand of both culturing microalgae.
Nitrogen-phosphorus wastewater is carried out pre-treatment should adopt sequencing batch reactor, its principle is that sewage gets into reactor drum in batches, reacts, precipitates, discharges upper clear supernate and idle process then in order, accomplishes an operation cycle.This reactor drum integrates reconciles pond, aeration tank and second pond function; Can carry out water quality and quantity adjusting, microbiological deterioration and solid-liquid separation; Can carry out intermittence or successive is aerobic and anaerobic treatment to waste water again, have that structure of reactor is simple, technology processing system arrange compact, save occupation of land, capital construction and working cost is low, the biochemical reaction impellent greatly, the anti impulsion load ability by force, effectively prevents advantages such as sludge bulking, sludge settling property is good, operation is flexible.In addition; Sequencing batch reactor can adopt the restriction aeration respectively, partly limit aeration, the abundant various combination operation scheme of aeration; On time series, realize the combination of aerobic/anaerobic or anaerobic/anoxic/aerobic and control the suitable time scale of each part, can access the denitrogenation dephosphorizing effect of artificial control.
[summary of the invention]
The objective of the invention is to design a kind of nitrogen-phosphorus wastewater, different environmental conditions that can be directed against different quality, with the method for sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater.
To achieve these goals, the present invention designs a kind of method of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater, it is characterized in that may further comprise the steps:
A, high concentration N-P sewage get into settling pit after grid is removed big swimmer and mechanical impurity, get in the sequencing batch reactor behind the removal silt and use active sludge treatment sewage;
B, the clear liquid that hydrophone drains strained in sequencing batch reactor get into membrane bioreactor and do further aerobic treatment; And remove various fine suspended substances and bacterium behind the ultrafiltration membrance filter in membrane bioreactor; Created basic condition for supporting the algae denitrogenation dephosphorizing, the mud discharging that sequencing batch reactor and membrane bioreactor produce is to mud storage pond;
The ultrafiltration clear liquid that c, membrane bioreactor produce joins in the bioreactor; Feeding ozone carries out disinfection; In bioreactor, add algae kind and a small amount of necessary nutritive salt then; And the feeding CO 2 waste gas, carry out the little algae of closed smooth autotrophy high-density breeding, absorb the nitrogen phosphorus in the nutrient solution with little algae simultaneously;
D, through micro algae growth week after date from bioreactor, discharges algae liquid and enters into flocculation sedimentation tank, in flocculation sedimentation tank, add flocculation agent and flocculate after little algae and the sedimentation water reuse in upper clear supernate qualified discharge or the conduct;
E, effusive concentrated algae liquid is compressed into little algal biscuit with plate-and-frame filter press from flocculation sedimentation tank bottom, can be used as the fodder additives of livestock and poultry diet immediately, or spray-dried tower is dried to microalgae powder with long preservation period.
The treatment process of the total nitrogen of said nitrogen-phosphorus wastewater when 50～280mg/L is: the time of aeration is 1 hour simultaneously in the water inlet of control sequencing batch reactor; Stopping into, the time of water continued aeration is 1～3 hour; ST is 1 hour; Water discharge time is 1 hour, and the preface batch operation cycle or the reactor drum waterpower residence time are 4～6 hours.
Treatment process when the total nitrogen of said nitrogen-phosphorus wastewater is higher than 280mg/L adopts the operating method of sequencing batch reactor segmental influent, the denitrogenation of stage aeration implementation part; The concrete operations mode is: the flooding time of control sequencing batch reactor is 1 hour; Stop into that aeration time is 1 hour behind the water, stop behind the aeration once more that flooding time is 1 hour, stopping into, the water afterreaction time is 1～2 hour; Aeration time is 1 hour once more; ST is 1 hour, and water discharge time is 1 hour, and the preface batch operation cycle or the reactor drum waterpower residence time are 7～8 hours.
Said nitrogen-phosphorus wastewater is in that the treatment process when poisonous adopts sequencing batch reactor to remove the toxicity in the nitrogen phosphorus organic sewage earlier to little algae; The concrete operations mode is: the flooding time of control sequencing batch reactor is 1 hour; Stop into that the anaerobism time of repose is 2 hours behind the water, the time of carrying out aeration then is 5～7 hours, and the ST is 1 hour; Water discharge time is 1 hour, and the preface batch operation cycle or the reactor drum waterpower residence time are 10～12 hours.
The treatment process of said nitrogen-phosphorus wastewater when envrionment conditions is unfavorable for micro algae growth must be carried out the part denitrogenation earlier with sequencing batch reactor; Sequencing batch reactor should adopt the operating method of segmental influent, stage aeration; The concrete operations mode is: flooding time is 1 hour, stops into that aeration time is 1～3 hour behind the water, and stopping behind the aeration once more, flooding time is 1 hour; Stopping into behind the water once more, aeration time is 1～3 hour; ST is 1 hour, and water discharge time is 1 hour, and the preface batch operation cycle or the reactor drum waterpower residence time are 6～10 hours.
Described high concentration N-P sewage adopts livestock and poultry cultivation ight soil and flushing sewage, human feces sewage, nitrogen fertilizer plant's sewage, Gourmet Powder Factory's sewage, bean product source mill sewage, sewage plant sludge supernatant and filtrating.
Said sequencing batch reactor is traditional sbr reactor device, ICEAS reactor drum, CASS reactor drum, CAST reactor drum, two sections sbr reactor devices, DAT-IAT reactor drum, UNITANK reactor drum, MSBR reactor drum, SBBR reactor drum, ASBR reactor drum, UniFed reactor drum, IDEA reactor drum, LUCUS reactor drum, AICS reactor drum, CWSBR reactor drum.
Said membrane bioreactor is polymeric membrane bio-reactor or ceramic membrane bioreactor.
Said bioreactor is duct type bioreactor or flat bioreactor or column airlift photobioreactor or vertical Pig or closed shallow annular pond.
Described little algae is adopted chlorella or scenedesmus obliquus or tenaculat Habenaria.
The present invention compared with prior art; Its advantage is: the advantage of giving full play to these two reactor drums of sequencing batch reactor and bioreactor; Remedy defective separately, can reach processing nitrogen-phosphorus wastewater change of water quality scope and utilize the dp that nitrogen phosphorus nutrient is produced economic little algae product in the sewage extensively, as far as possible.
[description of drawings]
Fig. 1 is a schema of the present invention;
Fig. 2 is the change of water quality table of the sewage purification process in nitrogen fertilizer plant of the present invention March～November;
Fig. 3 is the change of water quality table of the sewage purification process in nitrogen fertilizer plant of the present invention December～February next year.
[embodiment]
Below in conjunction with accompanying drawing, the present invention is further specified, production technology of the present invention is to implement easily to this professional people.
China's synthetic ammonia chemical fertilizer industry recent two decades is developed rapidly, YO row No. 1 in the world.Nitrogenous fertilizer enterprises has also been discharged and has been contained ammonia-nitrogen sewage in a large number when the industrial or agricultural desired product is satisfied in production, becomes the sewage discharge rich and influential family.For administer and utilize in nitrogen fertilizer plant's technology can't recycle concentration be lower than the ammonia-nitrogen sewage of 500mg/L; Near a tame nitrogen fertilizer plant, build waste disposal plant, both culturing microalgae and processing units; Adopt the method for sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater; The sewage purification Cheng Zhongshui and the reuse that produce nitrogen fertilizer plant are water of productive use, produce the fine chlorella powder simultaneously, referring to Fig. 1.
This nitrogen fertilizer plant produces about 1000m every day
3High concentration N-P sewage, these sewage get into 100m remove mechanical impurity such as big swimmer through grid maker after
3Settling pit, get into 600m after removing silt
3The sbr reactor device in use active sludge treatment sewage, the clear liquid that hydrophone drains strained in the sbr reactor device gets into that day to handle a water yield be 1000m
3Plate membrane bioreactor do further aerobic treatment, when sewage saw through the aperture and is the flat sheet membrane of 0.1 μ m, bacterium and most fine suspended substance all were retained down, for next step foster algae denitrogenation dephosphorizing has been created basic condition.The mud discharging that sbr reactor device and plate membrane bioreactor produce is to 600m
3Six lattice mud storages pond in, mud is transported to the refuse landfill landfill outside after gravity settling and natural mummification.Ultrafiltration clear liquid to plate membrane bioreactor produces is used the light bioreactor for treatment by one-period circulation in 6 days, promptly adopts 60 100m
3Bioreactor, join wherein 10 to the ultrafiltration clear liquid every day successively, feed ozone and carry out disinfection, kill harmful organisms wherein.This bioreactor for the inventor applied for patent of invention the aeration type bioreactor (aeration type bioreactor and application method thereof. Chinese invention patent, application number: 200910047898.7).Then, in the aeration type bioreactor, insert chlorella algae kind, press 3.3g/m
3Concentration add ironic citrate, press 0.15g/m
3Concentration add VITMAIN B1, and feed the CO 2 waste gas that nitrogen fertilizer plant's conversion section produces, carry out closed smooth autotrophy high-density breeding chlorella, absorb the nitrogen phosphorus in the nutrient solution with chlorella simultaneously.Foster algae is discharged algae liquid and enters into 250m from bioreactor after 6 days
3Flocculation sedimentation tank in, in the pond, add flocculate with chitosan chlorella and sedimentation after, upper clear supernate is collected 600m
3Middle pond in, recycle as producing reuse water.After pumping up from the effusive concentrated algae liquid in flocculation sedimentation tank bottom, get into spray-drying tower and be dried to the bead algae powder.
Different by season; The annual nitrogen fertilizer plant's sewage of handling is divided into two stages; To sequencing batch reactor and the bioreactor in the accompanying drawing 1 described flow process, adopt following coupling process to handle nitrogen-phosphorus wastewater respectively, the change of water quality of sewage purification process is referring to Fig. 2 and Fig. 3.
(1) March～November
Nitrogen fertilizer plant is during March～November, and the change of water quality of sewage purification process is seen Fig. 2,250 tons of bead algae powders of symbiosis output.Temperature is higher during this period, is adapted at culturing in the bioreactor chlorella, and the function of sbr reactor device is the COD in the reduction sewage, and the nitrated one-tenth nitrate of ammonia nitrogen.In the concrete operations be control sbr reactor device water inlet simultaneously the time of aeration be 1 hour, stop into that the time of water continued aeration is 2 hours, the ST is 1 hour, water discharge time is 1 hour, a preface batch operation cycle is 5 hours.
(2) December～February next year
Nitrogen fertilizer plant is during December～February next year, and the change of water quality of sewage purification process is seen Fig. 3,50 tons of bead algae powders of symbiosis output.Temperature is lower during this period, and the ability of in bioreactor, culturing the chlorella denitrogenation dephosphorizing is restricted, and must bring into play the denitrogenation dephosphorizing function of sbr reactor device, removes a part of nitrogen phosphorus in the sewage earlier.This moment, the sbr reactor device should adopt the operating method of segmental influent, stage aeration; The concrete operations mode is: flooding time is 1 hour, stops into that aeration time is 2 hours behind the water, and stopping behind the aeration once more, flooding time is 1 hour; Stopping into behind the water once more, aeration time is 2 hours; ST is 1 hour, and water discharge time is 1 hour, and a preface batch operation cycle is 8 hours.
Claims (10)
1. the method for a sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater is characterized in that may further comprise the steps:
A, high concentration N-P sewage get into settling pit after grid is removed big swimmer and mechanical impurity, get in the sequencing batch reactor behind the removal silt and use active sludge treatment sewage;
B, the clear liquid that hydrophone drains strained in sequencing batch reactor get into membrane bioreactor and do further aerobic treatment; And remove various fine suspended substances and bacterium behind the ultrafiltration membrance filter in membrane bioreactor; Created basic condition for supporting the algae denitrogenation dephosphorizing, the mud discharging that sequencing batch reactor and membrane bioreactor produce is to mud storage pond;
The ultrafiltration clear liquid that c, membrane bioreactor produce joins in the bioreactor; Feeding ozone carries out disinfection; In bioreactor, add algae kind and a small amount of necessary nutritive salt then; And the feeding CO 2 waste gas, carry out the little algae of closed smooth autotrophy high-density breeding, absorb the nitrogen phosphorus in the nutrient solution with little algae simultaneously;
D, through micro algae growth week after date from bioreactor, discharges algae liquid and enters into flocculation sedimentation tank, in flocculation sedimentation tank, add flocculation agent and flocculate after little algae and the sedimentation water reuse in upper clear supernate qualified discharge or the conduct;
E, effusive concentrated algae liquid is compressed into little algal biscuit with plate-and-frame filter press from flocculation sedimentation tank bottom, can be used as the fodder additives of livestock and poultry diet immediately, or spray-dried tower is dried to microalgae powder with long preservation period.
2. the method for a kind of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater as claimed in claim 1; The treatment process of total nitrogen when 50～280mg/L that it is characterized in that said nitrogen-phosphorus wastewater is: the time of aeration is 1 hour simultaneously in the water inlet of control sequencing batch reactor; Stopping into, the time of water continued aeration is 1～3 hour; ST is 1 hour, and water discharge time is 1 hour, and the preface batch operation cycle or the reactor drum waterpower residence time are 4～6 hours.
3. the method for a kind of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater as claimed in claim 1; Treatment process when the total nitrogen that it is characterized in that said nitrogen-phosphorus wastewater is higher than 280mg/L adopts the operating method of sequencing batch reactor segmental influent, the denitrogenation of stage aeration implementation part; The concrete operations mode is: the flooding time of control sequencing batch reactor is 1 hour; Stop into that aeration time is 1 hour behind the water, stop behind the aeration once more that flooding time is 1 hour, stopping into, the water afterreaction time is 1～2 hour; Aeration time is 1 hour once more; ST is 1 hour, and water discharge time is 1 hour, and the preface batch operation cycle or the reactor drum waterpower residence time are 7～8 hours.
4. the method for a kind of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater as claimed in claim 1; It is characterized in that said nitrogen-phosphorus wastewater is in that the treatment process when poisonous adopts sequencing batch reactor to remove the toxicity in the nitrogen phosphorus organic sewage earlier to little algae; The concrete operations mode is: the flooding time of control sequencing batch reactor is 1 hour; Stop into that the anaerobism time of repose is 2 hours behind the water, the time of carrying out aeration then is 5～7 hours, and the ST is 1 hour; Water discharge time is 1 hour, and the preface batch operation cycle or the reactor drum waterpower residence time are 10～12 hours.
5. the method for a kind of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater as claimed in claim 1; It is characterized in that the treatment process of said nitrogen-phosphorus wastewater when envrionment conditions is unfavorable for micro algae growth must carry out the part denitrogenation earlier with sequencing batch reactor; Sequencing batch reactor should adopt the operating method of segmental influent, stage aeration; The concrete operations mode is: flooding time is 1 hour, stops into that aeration time is 1～3 hour behind the water, and stopping behind the aeration once more, flooding time is 1 hour; Stopping into behind the water once more, aeration time is 1～3 hour; ST is 1 hour, and water discharge time is 1 hour, and the preface batch operation cycle or the reactor drum waterpower residence time are 6～10 hours.
6. the method for a kind of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater as claimed in claim 1 is characterized in that described high concentration N-P sewage adopts livestock and poultry cultivation ight soil and flushing sewage, human feces sewage, nitrogen fertilizer plant's sewage, Gourmet Powder Factory's sewage, bean product source mill sewage, sewage plant sludge supernatant and filtrating.
7. the method for a kind of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater as claimed in claim 1 is characterized in that said sequencing batch reactor is traditional sbr reactor device, ICEAS reactor drum, CASS reactor drum, CAST reactor drum, two sections sbr reactor devices, DAT-IAT reactor drum, UNITANK reactor drum, MSBR reactor drum, SBBR reactor drum, ASBR reactor drum, UniFed reactor drum, IDEA reactor drum, LUCUS reactor drum, AICS reactor drum, CWSBR reactor drum.
8. the method for a kind of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater as claimed in claim 1 is characterized in that said membrane bioreactor is polymeric membrane bio-reactor or ceramic membrane bioreactor.
9. the method for a kind of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater as claimed in claim 1 is characterized in that said bioreactor is duct type bioreactor or flat bioreactor or column airlift photobioreactor or vertical Pig or closed shallow annular pond.
10. the method for a kind of sequencing batch reactor coupling light bioreactor for treatment nitrogen-phosphorus wastewater as claimed in claim 1 is characterized in that described little algae employing chlorella or scenedesmus obliquus or tenaculat Habenaria.
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