CN107935314A - Soybean wastewater micro-organism treatment process - Google Patents
Soybean wastewater micro-organism treatment process Download PDFInfo
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- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F3/30—Aerobic and anaerobic processes
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- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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Abstract
The present invention relates to field of waste water treatment, and in particular to soybean wastewater micro-organism treatment process.Including following processing step：Waste water sequentially flows through membrane bioreactor, hydrolysis acidification pool, anaerobic pond, biological synchronous degradation pond and sludge-water separating system.Membrane bioreactor degrades the macro-molecular protein in waste water, accelerates sequential hydrolysis speed；Particulate matter and macromolecular are hydrolyzed into solable matter and the COD that degrades by hydrolysis acidification pool；Degrade COD while anaerobic pond generation methane；Biological synchronous degradation pond is using low dissolved oxygen aeration synchronous degradation COD and N；Biological synchronous degradation pond end mixed-liquor return arrives sludge-water separating system to water inlet end, part lifting；Clear water qualified discharge after mud-water separation, the water inlet end of sludge reflux to hydrolysis acidification pool；Excess sludge is discharged into sludge treatment system.The technique saves the time, solve return flow time-consuming, N is exceeded, sludge quantity is big and it is of high cost the problems such as, processing water outlet reach《Integrated wastewater discharge standard》(GB8978 1996) first discharge standard.
Description
【Technical field】
The present invention relates to a kind of waste water treatment process field, more particularly to soybean wastewater micro-organism treatment process, is profit
With the technique of microbial synchronous degraded soybean wastewater COD and N.
【Background technology】
The characteristics of soybean wastewater is that the big organic concentration of discharge capacity of waste water is high, complicated component.By taking bean curd produces as an example,
Yellow swill COD is up to 20000 and arrives 30000mg/L, and soaking bean water COD arrives 8000mg/L for 4000, and wash rinse tax COD arrives for 500
1500mg/L.The main component of soaking bean water has the organic acid such as oligosaccharides, citric acid such as water-soluble nonprotein nitrogen, tax threose, raffinose
And water soluble vitamin, mineral matter etc., in addition, the also colors such as isoflavones.The composition of yellow swill is increasingly complex, removes
Beyond all the components containing soaking bean water, also containing protein (soy whey, soybean lectin, trypsin ihhibitor
Deng), amino acid, lipid etc..Contain soy whey, carbohydrate, bean dregs and detergent etc. in bean curd production water for cleaning.Bean product
Wastewater treatment not qualified discharge, can cause body eutrophication, anoxic, fishes and shrimps disappearance, water quality deterioration, smelly, seriously impurely
Table underground water.
Return flow, technique most widely used at present is " sedimentation basin or flotation tank+anaerobic pond+aerobic tank+air supporting
Pond ", water outlet CODCr100~200mg/L, 40~90mg/L of ammonia nitrogen after processing.Control《Integrated wastewater discharge standard》(GB8978-
1996) first discharge standard, COD and N are exceeded, and the particularly exceeded phenomenons of N are commonplace, and sludge volume in wastewater treatment process
Greatly, time-consuming, and processing cost is high.Its major technique reason is：
Traditional A/O techniques and its extension process and device are to high concentration COD and N and the return flow deposited, office
It is sex-limited very big：First, nitrification and denitrification is placed in different spaces or time, technological process is caused to be grown, waste water is degraded in BOD5
(30mg/L) below certain value, just carries out nitration reaction, it is necessary to which the biochemical pool volume of configuration is big, wastewater treatment under-capitalization will
Removal efficiency is caused not reach design requirement；Second, biological denitrificaion restraining factors are more, total nitrogen removal efficiency is low (being less than 80%), makes
Water outlet N index exceeding standards after into processing.
The grease and SS contents of soybean wastewater are very high, can cause the blocking or damage of follow-up anaerobic pond three phase separator,
Therefore physico-chemical precipitation or pneumatically supported method are utilized before biochemical treatment, grease and SS is removed, water quality is met three phase separator
Inflow requirement, this just produces substantial amounts of sludge, and sludge components are mainly grease and materialization flco, 4~8 tons of dirts of sludge discharge
Mud/kiloton waste water (moisture content~80%).
The medicament such as feeding lime, coagulant, PAM, liquid caustic soda in wastewater treatment process, causes medicament expense increase and sludge
Disposal costs increase, generally reflects wastewater treatment 2.5~3.0 yuan/ton of waste water of expense.
Synchronous nitration and denitrification theory (SND) and low oxygen dissolving control technology, new theoretical foundation is provided to biological denitrificaion
And technological means；The country such as last century the nineties Holland and Belgium have developed corresponding CANON techniques and OLAND techniques.
Its core is：Biochemistry pool controls low dissolved oxygen environments, realized in biochemistry pool short distance nitration and Anammox, aerobic nitrification and
The biochemical reactions such as aerobic denitrification, i.e., with pond simultaneous denitrification.But due to the low dissolved oxygen scope of these technology controlling and process it is narrow (0.1~
0.5mg/L), high concentration COD and N and deposit return flow when, the degradation efficiency of COD and N are not ideal enough.
【The content of the invention】
In view of the above, it is necessary to provide a kind of degradation efficiency of COD and N high soybean wastewater microbiological treatment work
Most of macro-molecular protein is hydrolyzed by microbial pretreatment skill, the technique, and in high concentration COD and N and is deposited
It is same in same pond by improving the aeration mode of biological simultaneous denitrification technique and improving low dissolved oxygen scope during return flow
On the basis of walking denitrogenation, strengthen COD degradation function, realize COD and N with pond synchronous degradation.
To reach above-mentioned purpose, the technical solution adopted in the present invention comprises the following steps：
(1) pre-process：Waste water enters after the membrane bioreactor based on micro-organisms bacillus processing is reacted and enters
Regulating reservoir, the membrane bioreactor reaction time based on micro-organisms bacillus processing is 32-48h, the regulating reservoir
Hydraulic detention time is 8~12h；
(2) particulate matter and macromolecular are hydrolyzed into solable matter and dropped by the adjusted pond lifting of waste water to hydrolysis acidification pool
Solve COD, the hydrolysis acidification pool, biochemical 8~12h of residence time；
(3) anaerobic pond is flowed into, produces methane degraded COD, then flows into biological synchronous degradation pond, synchronous degradation COD and N, institute
The anaerobic pond stated, biochemical 24~36h of residence time, water inlet end add lye, control inlet flow-patterm 6.5~7.5；The biology is same
Walk degraded pond, dissolved oxygen scope 0.1~1.2mg/L, biochemical 36~48h of residence time；
(4) the mixed liquor partial reflux of biological synchronous degradation pond end arrives sludge-water separating system to water inlet end, part lifting,
Clear water qualified discharge after mud-water separation, sludge reflux to hydrolysis acidification pool, the mixed-liquor return, reflux ratio 20~30
Times；
(5) excess sludge produced in wastewater treatment process is discharged into sludge treatment system.
The invention has the advantages that：
1. saving the time, sludge discharge is small.Whole biochemical processing process, drops macro-molecular protein in pretreatment stage
Solution, accelerates sequential hydrolysis speed, saves the time, and makes existing physico-chemical precipitation pond or flotation tank into hydrolysis acidification pool, at the same time
Using biological synchronous degradation technology, biochemistry pool control sludge concentration is high, per kiloton waste water production 0.7~1.2 ton of (moisture content of mud
80%), more than 75% is reduced compared with traditional handicraft.
2.COD and N is with pond synchronous degradation, and degradation efficiency is lifted：CODCr removal rates are more than 90%, and ammonia nitrogen removal frank is big
In 91%, nitrogen removal rate is more than 83%, and effluent quality reaches《Integrated wastewater discharge standard》(GB8978-1996) first grade discharging
Standard.
3. cost for wastewater treatment is low：The medicaments such as feeding lime, coagulant, PAM are not required in technique, and are exposed using low dissolved oxygen
Gas, 1.5~2.0 yuan/ton of waste water of cost for wastewater treatment, more than 42% is reduced compared with traditional handicraft.
【Brief description of the drawings】
Fig. 1 is the flow diagram of soybean wastewater micro-organism treatment process embodiment of the present invention.
For a better understanding of the technical solution of the present invention, it is illustrated with reference to embodiment.
【Embodiment】
Referring to Fig. 1 soybean wastewater micro-organism treatment process, the step of handling waste water, is as follows：
(1) pre-process：Waste water enters the membrane bioreactor based on micro-organisms bacillus processing and is reacted, with laggard
Enter regulating reservoir；
(2) particulate matter and macromolecular are hydrolyzed into solable matter and dropped by the adjusted pond lifting of waste water to hydrolysis acidification pool
Solve COD；
(3) anaerobic pond is flowed into, produces methane degraded COD, then flows into biological synchronous degradation pond, synchronous degradation COD and N；
(4) the mixed liquor partial reflux of biological synchronous degradation pond end arrives sludge-water separating system to water inlet end, part lifting,
After mud-water separation in system, clear water qualified discharge, sludge reflux to hydrolysis acidification pool；
(5) excess sludge produced in wastewater treatment process is discharged into sludge treatment system.
The membrane bioreactor reaction time based on micro-organisms bacillus processing of step (1) is 32-48h, its
Effect is the macro-molecular protein in waste water is effectively degraded；The regulating reservoir hydraulic detention time is 8~12h, its
Effect is regulating pondage and uniform water quality.Mechanical grille machine and web plate Microfilter are set before regulating reservoir, pass through mechanical grille machine
The rubbish and beans shell in waste water are removed, cracked soybeans and bean dregs are removed by web plate Microfilter.
Hydrolysis acidification pool described in step (2), selects UBF (compound anaerobic fluidized bed), biochemical 8~12h of residence time,
It is that the particulate matter in waste water and macromolecular are hydrolyzed into solable matter that it, which is acted on, and degrade COD, reduces mud discharging.With hydrolysis
Acidification pool substitutes traditional physico-chemical precipitation pond or flotation tank, and the soybean cellulose and polysaccharide hydrolysis in waste water are glucose, lipid
Aliphatic acid is changed into, hydrolysate is all dissolved in water, and water outlet SS meets the three phase separator requirement of follow-up anaerobic pond.Hydrolysis acidification pool
Intake for bottom, 0.8~1.2m/h of control current upflow velocity；CODCr removes 3~5KgC of volumetric loading OD/m3.d；Hydrolysis
High 10~the 12m in pond of acidification pool, top set waste gas disposal system, and top sets inclined tube or inclined plate, intermediate hanging biologic packing material, bottom
Portion sets bucket and mud line, and using gravity type intermittence spoil disposal, excess sludge is discharged into sludge treatment system, converts into dewatered sludge
0.2~0.4 ton/kiloton waste water (moisture content 80%)；Water outlet gravity stream enters anaerobic pond.
Anaerobic pond described in step (3), selects EGSB (anaerobic expanded granular sludge bed), biochemical 24~36h of residence time,
It acts on the COD that degrades while being and produce methane.By the water outlet of leading portion hydrolysis acidification, anaerobic reaction is completed most in anaerobic pond
Latter stage, methanogen produce methane gas using acetic acid, hydrogen and carbon dioxide, and degrade COD.On the top of anaerobic pond
Portion, gas, solid, liquid three-phase are separated, and methane recovery utilizes, and water outlet part circulation, another part enters subsequent biochemical system, remains
Hydrolysis acidification pool is taken out or be discharged into remaining sewage sludge storage.High 13~the 15m in pond of anaerobic pond, Chi Ding have lid, and supporting collecting methane, place
Reason, utilize device；The decarbonization for being conducive to methane-producing bacteria into water pH value is properly increased, controls pH6.5~7.5, supporting liquid
Alkali adds and pH robot control system(RCS)s；Anaerobic pond is intake for bottom, and the appropriate waste water inner recirculation flow speed that increases can improve muddy water mixing, control
2~4m/h of current upflow velocity processed；CODCr removes 5~10KgCOD/m3.d of volumetric loading；Water part pump lifting circulation,
Circulating pump head is more than 24m；Water outlet gravity flows to biological synchronous degradation pond；Hydrolysis acidification is taken out or is discharged into excess sludge storage
Pond.
Biological synchronous degradation pond described in step (4), the water inlet end of aeration zone are mixed using multiple spot water distribution with backflow mixed liquor
Close, dissolved oxygen scope 0.1~1.2mg/L, biochemical 36~48h of residence time, MLSS are controlled by the online dissolved oxygen meter in aeration zone
7000~8500mg/L, CODCr remove 0.8~1.6KgCOD/m3.d of volumetric loading, ammonia nitrogen removal volumetric loading O.1~0.4Kg
Ammonia nitrogen/m3.d.The effect in biological synchronous degradation pond is synchronous degradation COD and N.Biological simultaneous denitrification technique and low dissolved oxygen control skill
" low dissolved oxygen " scope of art setting is narrow (0.1~0.5mg/L of value), in return flow, due to supplying oxygen total amount
Deficiency, the oxidation to high concentration COD is not abundant enough, and COD degradation efficiency is low, it is necessary to extend the biochemical residence time or increase is biochemical
Tankage, therefore, under low dissolved oxygen level, properly increases aeration zone dissolved oxygen control range (0.1~1.2mg/L), that is, ensures
While simultaneous denitrification, and improve COD degradation.The low dissolved oxygen control in biological synchronous degradation pond, shows that microorganism is in " and oxygen "
In the critical environment of " aerobic ", microbial population enriches, the mechanism of degradation more diversification to organic matter.In " and oxygen " environment：
And the macromoleculars such as organic carbon and azacyclo- are hydrolyzed into small molecule by oxygen heterotroph, NO2- and NO3- are reduced into by anoxic denitrification bacterium
N2, anaerobic ammonia oxidizing bacteria are by ammoxidation into N2；In " aerobic " environment：Organic carbon is oxidized to CO2, aerobic nitrification by aerobic heterotroph
Bacterium by ammoxidation into NO2- with a small amount of NO3-, aerobic denitrifying bacteria by ammoxidation into N2.Reacted by above-mentioned array of biochemical, it is real
Existing COD and N is the same as pond synchronous degradation.
Mixed-liquor return described in step (4), 20~30 times of reflux ratio.The mixed-liquor return of biological synchronous degradation pond end
To water inlet end, it is to improve flow condition that it, which is acted on, increases sludge concentration.Microorganism characterizes obvious, the removal of raising COD and N
Rate, reduces sludge discharge capacity.
Sludge-water separating system described in step (4), selects ultrafiltration membrane, ultrafiltration membrane clear water qualified discharge, sludge part reflux
Enter the dehydration outward transport of sludge treatment system to hydrolysis acidification pool water inlet end, small part, convert into dewatered sludge 0.6~0.8 ton/kiloton
Waste water (moisture content 80%).Soybean wastewater COD and N concentration are high, and wastewater biodegradability is good, and sludge yield is big, and sludge concentration is high,
MLSS7000~8500mg/L, the method clarified using inclined tube or inclined plate, water outlet band mud phenomenon select ultrafiltration than more serious
UF membrane, film process clear water COD stablize.
Embodiment, certain Bean Products Factory's wastewater treatment
Wastewater treatment original technique and device are " regulating reservoir+physico-chemical precipitation pond+anaerobic pond+aerobic tank+materialization flotation tank ", are gone out
Water ammonia nitrogen and total nitrogen are exceeded, and sludge yield is big, and processing cost is high.Technique adjustment practice is carried out using the present invention.
Technique after adjustment：" membrane bioreactor+regulating reservoir+UBF pond+EGSB ponds+biology synchronous degradation pond ".
Technological parameter after adjustment：Membrane bioreactor：Reaction time：48h, macro-molecular protein percent hydrolysis 50%
More than；UBF ponds：Biochemical residence time 12h, water outlet CODCr8450mg/L, CODCr removal rate 16%, CODCr remove volume and bear
Lotus 3.1KgCOD/m3.d；EGSB ponds：Biochemical residence time 26h, pH6.8, water outlet CODCr1960mg/L, CODCr removal rate
77%, CODCr remove volumetric loading 6.0KgCOD/m3.d；Biological synchronous degradation pond：Biochemical residence time 46h, dissolved oxygen scope
0.1~1.2mg/L, MLSS 7600~8360mg/L, CODCr removal rate 96%, CODCr remove volumetric loading 1.0KgCOD/
M3.d, ammonia nitrogen removal frank 99%, ammonia nitrogen removal volumetric loading 0.2Kg ammonia nitrogens/m3.d；Mixed-liquor return equipment is air lift water pump,
24 times of reflux ratio；Mud-water separation uses external pipe type ultrafiltration membrane.Indexes Comparison is referring to table 1 before and after technique adjustment.
Certain the Bean Products Factory's waste water treatment process adjustment of table 1 is compared
Upper table shows that present invention process CODCr removal rates height (99%), ammonia nitrogen removal frank is high (99%), nitrogen removal rate
High (92%), effluent quality reaches《Integrated wastewater discharge standard》(GB8978-1996) first discharge standard, and sludge (contains
Water rate~80%) discharge capacity reduction 75%, cost for wastewater treatment reduces by 42%.
Described above is the detailed description for the present invention preferably possible embodiments, but embodiment is not limited to this hair
Bright patent claim, equal change or the modification change completed under the technical spirit suggested by all present invention, should all belong to
Cover the scope of the claims in the present invention.
Claims (6)
1. soybean wastewater micro-organism treatment process, it is characterised in that including following processing step：
(1) pre-process：Waste water, which enters after the membrane bioreactor based on micro-organisms bacillus processing is reacted to enter, to be adjusted
Pond；
(2) particulate matter and macromolecular are hydrolyzed into solable matter and degraded by the adjusted pond lifting of waste water to hydrolysis acidification pool
COD；
(3) anaerobic pond is flowed into, produces methane degraded COD, then flows into biological synchronous degradation pond, synchronous degradation COD and N；
(4) the mixed liquor partial reflux of biological synchronous degradation pond end arrives sludge-water separating system, muddy water to water inlet end, part lifting
Clear water qualified discharge after separation, sludge reflux to hydrolysis acidification pool；
(5) excess sludge produced in wastewater treatment process is discharged into sludge treatment system.
2. soybean wastewater micro-organism treatment process according to claim 1, it is characterised in that：The step (1) it is anti-
It is 32-48h between seasonable.
3. soybean wastewater micro-organism treatment process according to claim 1, it is characterised in that：The water of the step (2)
Solve acidification pool, biochemical 8~12h of residence time.
4. soybean wastewater micro-organism treatment process according to claim 1, it is characterised in that：Step (3) detest
Oxygen pond, biochemical 24~36h of residence time, water inlet end add lye, control inlet flow-patterm 6.5~7.5.
5. soybean wastewater micro-organism treatment process according to claim 1, it is characterised in that：The life of the step (3)
Thing synchronous degradation pond, dissolved oxygen scope 0.1~1.2mg/L, biochemical 36~48h of residence time.
6. soybean wastewater micro-organism treatment process according to claim 1, it is characterised in that：The step (4) is mixed
Close liquid reflux, 20~30 times of reflux ratio.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115072942A (en) * | 2022-07-25 | 2022-09-20 | 威海蓝创环保设备有限公司 | Combined treatment process for aquatic product processing wastewater and domestic sewage |
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