CN105084681A - Process for treating livestock slaughter wastewater - Google Patents
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Abstract
The invention relates to a process for treating livestock slaughter wastewater, and belongs to the technical field of wastewater treatment. The process for treating livestock slaughter wastewater is realized through the following technical scheme: firstly, the wastewater is filtered by passing through a mechanical grid, so that the slag is removed; then, the obtained wastewater is subjected to oil separation and sedimentation treatments by passing through an oil separator and a coagulating sedimentation tank in sequence; then, the obtained wastewater is subjected to anaerobic and aerobic treatments by entering an anaerobic inner circulation biological fluidized bed and a three-phase inner circulation biological fluidized bed in sequence, so that the macromolecule and refractory organic matters are decomposed into inorganic matters; finally, sedimentation treatment is carried out, the sludge enters a sludge chamber, and the upper-layer clean water after treatment can be discharged in line with the standards. According to the invention, the anaerobic inner circulation biological fluidized bed and the three-phase inner circulation biological fluidized bed are used in a combined manner to treat the slaughter wastewater, and the characteristics of being environment-friendly, efficient, inexpensive, and high in operating flexibility are realized; the wastewater treatment process is simple, and high in stability and treatment capability, facilitates the realization of integration, standardization and serialization, and solves the problems that the conventional treatment method is restricted by scale, capital and technical conditions.
Description
Technical field
The invention belongs to environment-protection wastewater processing technology field, particularly livestock class wastewater processing technology, be specially a kind for the treatment of process of livestock class slaughterhouse wastewater.
Background technology
Butchering is water consumption rich and influential family in meat-processing industry, and along with the raising of people's living standard, to the increase of meat product demand, the wastewater discharge of slaughterhouse, meat processing combine also increases increasingly.The waste water that livestock class butchers processing industry generation is many in brown, and with unpleasant fishy smell, wherein containing a large amount of suspended solids such as greasy dirt, grease matter, hair, meat bits, bone bits, internal organ foreign material, non-digest food and ight soil, the outflow of these foreign material can cause very large pollution to environment, even destructive impact, therefore needs to set up a kind of effective method of wastewater treatment.
Slaughterhouse wastewater is mostly high chroma, the organic waste water of high density, there is the features such as suspended sediment concentration is high, COD concentration is high, biodegradability is good, but wherein high-concentration organic matter is not easily degraded, intractability is larger, and such waste water affects by dull and rush season and production discontinuity, wastewater flow rate and change of water quality larger.
At present to the improvement of butchering class waste water, adopt the treatment process based on biological process more, mainly comprise the treatment processs such as aerobic, anaerobism and double oxygen, but due to such waste water fat content higher, settling property is poor, can not reach desirable treatment effect.Often scale is less to add meat producing plant, distribution also comparatively disperses, and traditional treatment process receives the restriction of scale, fund, technology and condition, makes waste water can not carry out advanced treatment before eliminating, thorough removing objectionable impurities wherein, causes great pollution to environment.
Summary of the invention
For solving the problem, the present invention proposes the slaughtering animal waste water treatment process that a kind of cost is low, processing power is large, shock resistance is good, for middle-size and small-size livestock class meat producing plant provides the method for wastewater treatment of a kind of economy, efficient, simple to operate, easy realization.The present invention is realized by following technical proposals:
A treatment process for livestock class slaughterhouse wastewater, mainly comprises the following steps:
1) waste water is carried out filter cleaner by mechanical grille;
2) oil trap is flowed into successively through the waste water of grid bulk processing and coagulative precipitation tank carries out oil removal precipitation process;
3) waste water through oil removal precipitation process enters anaerobism inner loop fluidized bed reactor, decomposes larger molecular organics and hardly degraded organic substance;
4) waste water after anaerobic treatment enters Three-phase internal circulation biological fluidized bed and carries out aerobic treatment, and oxidation operation in sewage is resolved into more stable inorganics;
5) precipitation process is carried out in the water outlet after aerobic treatment, and mud enters sludge sump, upper strata clear water qualified discharge after treatment.
Preferred as one, described mechanical grille is two groups, and wherein coarse grid is front, and thin grid is rear, and the gap that coarse rack deletes bar is 20mm, and the gap that fine fack deletes bar is 4mm.
Preferred as one, reciprocal oil-scraping device is installed on described oil trap top.
Preferred as one, described coagulative precipitation tank need add coagulation medicine and precipitate.
Preferential as one, described coagulation medicine is polymerize aluminum chloride.
Preferred as one, described Three-phase internal circulation biological fluidized bed Aerobic is also provided with fan jet flow aeration.
Preferred as one, described sedimentation processing technology need add high-molecular biologic flocculation agent.
Preferred as one, described high-molecular biologic flocculation agent is one or more in polyglutamic acid, polycysteine.
Preferred as one, described upper strata clear water need carry out disinfection by chlorine dioxide process up to standard after could discharge.
First slaughterhouse wastewater carried out filter cleaner by mechanical grille; its objective is the thick foreign material such as fur, meat bits, bone bits in removing waste water; to protect subsequent pipeline equipment; convenient subsequent processes; prevent subsequent disposal pipeline by thick material damage, affect service efficiency and device processes life-span.
Contained by undressed butchering in raw wastewater, foreign material kind is many, and foreign material size range is wider, except also including the various instruments of butchering use, the materials such as support containing butchering thing itself, in order to prevent, foreign material are assorted at grid place to be piled, improve grid screening efficiency, arrange two groups of grids and carry out preliminary treatment to waste water, and coarse rack is front, fine fack is rear, the gap that coarse rack deletes bar is 20mm, and the gap that fine fack deletes bar is 4mm.The object of such setting is the batch treatment in order to realize waste water impurity, waste water is first filtered by the material that coarse rack is larger to particle diameter, and then carry out filtration removal by the material that fine fack is less to particle, the processing efficiency of impurity can be improved like this, make contaminant filter more thoroughly clean, can prevent again impurity from mixing and pile quality problems that grid is caused, reach economical and practical object.
Waste water inflow oil trap through grid bulk processing carries out grease process, in order to collect the grease swimming in surface, installing reciprocal oil-scraping device, be sent to professional factory and process after Grease Collection on oil trap top.Waste water, then from flowing into coagulative precipitation tank, being removed the residual foreign material such as grease, hair further, being removed the pollution substance that proportion is greater than water.In order to improve the coherency of impurity, more removing the large impurity of pollution in waste water, coagulation medicine should be added help impurity phase mutual coagulation precipitation in coagulative precipitation tank.Oil removal and coagulating sedimentation operation had both played oil removal precipitating action to obtain oleaginousness and the lower sewage of solid suspension substrate concentration, also can carry out adjustment and average to sewage by oil trap and settling tank simultaneously, reduce the fluctuation of the sewage water yield, water quality, for subsequent disposal provides best steady running condition.
After oil trap and coagulative precipitation tank, waste water enters anaerobism inner loop fluidized bed reactor, and fill the carrier of porous, large specific area in fluidizer, advantage anaerobion is evenly attached on carrier, forms microbial film.Wherein, anaerobion is bacterium, actinomycetes and mycoplasma.Waste water flows through carrier with the speed of 1.5 ~ 2.5m/h, by vehicle fluidizes, anaerobic species is attached on carrier at fluidized-bed internal recycle, and not easily run off with waste water, and by sulfuration, waste water is fully contacted with anaerobion, enhance the effect of mass transmitting between organism and microbial film, between particle, make because colliding frequently, rubbing microbial film not easily long thick, larger molecular organics and hardly degraded organic substance obtain sufficient decomposition, and waste water COD effectively reduces.For maintaining higher fluidizing velocity, improve anaerobion and organic reaction efficiency, need adopt reflux ratio be 1 ~ 3 larger reflux ratio.
Waste water after anaerobic treatment enters Three-phase internal circulation biological fluidized bed treater, and the carrier of placing porous, large specific area in fluidized-bed, aerobic microbiological is attached on carrier and forms microbial film.Wherein, aerobic microbiological refers to growth and breeding in aerobic environment, the production capacity metabolic process of oxidation of organic compounds or inorganics, is final electron acceptor(EA), carries out aerobic repiration, comprise bacterium, actinomycetes and fungi with molecular oxygen.Under the effect of air, biofilm surface is constantly updated, microorganism in device maintains the growth vigorous stage, and the abundant contact of air, waste water, microorganism three-phase is realized by sulfuration, organic pollutant in microorganism panning sewage on microbial film is as nutrition, oxidation operation in waste water is resolved into more stable inorganics, sewage is purified, reduce waste water COD index further.
Three-phase internal circulation biological fluidized-bed reactor compact construction, floor space is little, and up-flow district and Jiang Liu district combine, and containing fan jet flow aeration, to provide enough tolerance and required gas speed.In fluidized-bed, carrier fluidizing performance is good, and the mass transfer rate of oxygen is high, and the residence time is extended and controlled microorganism in the reactor, and in waste water, oxidation operation rate of decomposition is high, and impurity treatment efficiency is fast, totally thoroughly.
" anaerobism inner loop fluidized bed reactor " and " Three-phase internal circulation biological fluidized bed " combines and carries out innovative point that slaughterhouse wastewater treatment is this technique and greatest improvement point, anaerobic-aerobic methods combining is adopted to carry out wastewater treatment, high to useless Organic substance in water, ammonia nitrogen removal efficiency, also there is the effect of certain denitrogenation dephosphorizing.Anaerobism inner loop fluidized bed reactor and aerobic Three-phase internal circulation biological fluidized bed are connected in series, and anaerobism inner loop fluidized bed reactor dissolved oxygen is not more than 0.2mg/L, and aerobic Three-phase internal circulation biological fluidized bed maintains 2 ~ 4mg/L dissolved oxygen.Anaerobism inner loop fluidized bed reactor heterotrophic bacterium, the suspended contaminant such as the starch in sewage, fiber, carbohydrate and dissolved organic matter are hydrolyzed to organic acid, larger molecular organics is made to be decomposed into small organic molecule, insoluble organism changes into dissolved organic matter, when these products through anaerobic hydrolysis enter Three-phase internal circulation biological fluidized bed carry out aerobic treatment time, biodegradability and the oxidation efficiency of sewage can be improved.In anaerobism section, the pollutent such as protein, fat is carried out ammonification (N in organic chain or the amino in amino acid) and to dissociate ammonia (NH3, NH4+) by heterotrophic bacterium, under sufficient oxygen supply condition, NH3-N (NH4+) is oxidized to NO3-by the nitrification of autotrophic bacteria, anaerobism inner loop fluidized bed reactor is back to by backflow control, NO3-is reduced to molecular nitrogen (N2) and completes C, N, O circulation in ecology by the denitrification of heterotrophic bacteria, realizes sewage harmless treatment.As can be seen from the above the method for anaerobic-aerobic combination, anaerobism is front, process macromolecule contaminant in waste water, for Three-phase internal circulation biological fluidized bed effectively reduces organic loading, be there is by the circulation of mud the function of denitrogenation dephosphorizing, higher to the waste water removal efficiency containing the macromolecule contaminant such as protein, fat than single aerobic or Anaerobic cultural methods, also there is the effect of denitrogenation dephosphorizing.Anaerobism inner loop fluidized bed reactor and aerobic Three-phase internal circulation biological fluidized bed are all fluidised principle combined with sewage disposal, mainly solve the problem liquid-solid in sewage treatment process, gas liquid contacting efficiency is low.
After Three-phase internal circulation biological fluidized bed aerobic treatment, water outlet enters settling tank, upper strata clear water qualified discharge after disinfection by chlorine dioxide.Sedimentation processing technology adds some high-molecular biologic flocculation agents, and as polyglutamic acid, polycysteine etc. can biodegradable flocculation agent, reduces the sludge quantity produced, and reduces secondary pollution, and the mud that precipitation is formed is delivered to sludge sump.
Beneficial effect of the present invention:
1. sewage treatment technology process of the present invention is simple, and operation is reliable, good stability, solves scale that medium and small sized enterprises are subject to when adopting traditional treatment method, fund, technical qualification restriction.
2. the feature that waste water treatment process of the present invention changes greatly for slaughterhouse wastewater water quality and quantity, COD, ammonia nitrogen, SS are high, adopt anaerobism inner loop fluidized bed reactor and Three-phase internal circulation biological fluidized bed combination treatment slaughterhouse wastewater, combine biological process energy-conserving and environment-protective and three-phase fluidized bed reaction efficiency is high, turndown ratio is strong feature, adopt porous, bigger serface particle, film forming is stablized, the bio-carrier that biomembrane area is large carries out wastewater treatment, ensureing that useless Organic substance in water is achieved the harmless process of sewage while effectively decomposing, reach the effect of environmental protection.
3. waste water treatment process of the present invention shortens the wastewater treatment time, capacity of resisting impact load is strong, compact arrangement of equipment, have processing power large, floor space is little, flexible operation, adaptable advantage, and be convenient to realize integrated, stdn, seriation, production cost is low, construction period is short, is applicable to middle-size and small-size meat producing plant wastewater treatment.
Accompanying drawing explanation
Fig. 1 is livestock class slaughterhouse wastewater treatment process flow sheet of the present invention.
Embodiment
Butcher class waste water treatment process below in conjunction with specific embodiment to one of the present invention to be described in detail, but following embodiment is not limited to technical solution of the present invention.
Livestock class slaughterhouse wastewater treatment technique of the present invention mainly comprises the steps:
Untreated inlet effluent COD content is 2200 ~ 6500mg/L, and ammonia-nitrogen content is 105 ~ 185mg/L, SS>10000mg/L, fat content >3000mg/L.
1. the mechanical grille that first slaughterhouse wastewater is made by grizzly bar is carried out filter cleaner; thick to fur in waste water, meat bits, bone bits etc. foreign material are removed; to protect subsequent pipeline equipment, prevent subsequent pipeline equipment from being destroyed by thick foreign material, convenient subsequent processes.Wherein mechanical grille is divided into coarse rack and fine fack, and waste water, first by coarse rack, except the foreign material that degranulation is larger, and then removes the less foreign material of degranulation by fine fack.The gap that coarse rack deletes bar is 20mm, and the gap that fine fack deletes bar is 4mm, and waste water fluid stream speed is less than 0.5m/s.
2. the waste water through grid bulk processing flows into oil trap, under installing the effect of reciprocal oil-scraping device, collects the grease swimming in surface, and the grease collected is sent to professional treatment carries out factory on oil trap top.Oil trap inlet effluent oleaginousness >3000mg/L in the present embodiment, outlet oleaginousness is reduced to <200mg/L, wherein, waste water oleaginousness testing tool adopts OiL-8 type infrared rays oil content analyzer to perform according to " the mensuration infrared spectrophotometry of water-quality petroleum and vegetable and animals oils " (GB/T16488-1996) national standard.Waste water through oil trap process flows into coagulative precipitation tank, and adds coagulation medicine polymerize aluminum chloride (PAC) and precipitate, and removes the residual foreign material such as grease, hair further, removes the pollution substance that proportion is greater than water.The treatment time of coagulative precipitation tank is 1.5 hours, and settling tank surface area water Flow Velocity is less than 1.5m
3/ m
2h).Coagulative precipitation tank ingress suspension content SS>10000mg/L in the present embodiment, outlet suspension content SS<850mg/L.Wherein, in waste water, the measurement of suspension content performs according to the gravimetry method of GB/T11901-1989 water quality suspended substance.
3. the waste water after oil removal precipitation process enters anaerobism inner loop fluidized bed reactor and carries out anaerobic treatment, under the sulfuration of waste water, carrier is at fluidized-bed internal recycle, the anaerobion be attached on carrier fully contacts with waste water, by the organic substance decomposing of larger molecular organics and difficult degradation, waste water COD effectively reduces, and reaches the cleaning effect of waste water.The anaerobic treatment time, carrier granule volume ratio was 15% generally more than 12 hours, and waste water flow velocity is 1 ~ 2.5m/h.In the present embodiment, anaerobism Internal Circulating Fluidized Bed inlet effluent COD is 2200 ~ 6500mg/L, outlet waste water COD <1800mg/L.
4. the waste water after anaerobic treatment enters Three-phase internal circulation biological fluidized bed treater and carries out aerobic treatment, aerobic microbiological is attached on carrier and forms microbial film, fan jet flow aeration, the abundant contact of air, waste water, microorganism three-phase in fluidized-bed, organic pollutant in aerobic microbiological picked-up sewage on microbial film is as nutrition, oxidation operation in waste water is resolved into more stable inorganics, sewage is purified, reduce waste water COD index further.Treatment time of itching well is 8 hours, and carrier granule volume ratio is 10%, and in aerobic Three-phase internal circulation, fluidisation power is mainly from blower fan, and blower fan tolerance is less than 300L/h, and hydraulic detention time is less than 10 hours.Aerobic Three-phase internal circulation biological fluidized bed outlet waste water COD <120mg/L in the present embodiment.
5., through aerobic treatment, the water outlet of Three-phase internal circulation biological fluidized bed treater enters settling tank, and supernatant water is qualified discharge after disinfection by chlorine dioxide.Sedimentation processing technology adds high-molecular biologic flocculation agent, and as polyglutamic acid, the flocculation agents such as polycysteine, reduce the sludge quantity produced, and reduce secondary pollution, the mud wherein precipitating formation is delivered to sludge sump.Wherein, the settling tank treatment time is approximately 1.5 hours, and the concentration of high-molecular biologic flocculation agent is 0.2g/L, and chlorine dioxide concentration is 3g/m
3, disinfecting time is 10 ~ 20 minutes.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a treatment process for livestock class slaughterhouse wastewater, is characterized in that, comprises the following steps:
1) waste water is carried out filter cleaner by mechanical grille;
2) oil trap is flowed into successively through the waste water of grid bulk processing and coagulative precipitation tank carries out oil removal precipitation process;
3) waste water through oil removal precipitation process enters anaerobism inner loop fluidized bed reactor, decomposes larger molecular organics and hardly degraded organic substance;
4) waste water after anaerobic treatment enters Three-phase internal circulation biological fluidized bed and carries out aerobic treatment, and oxidation operation in sewage is resolved into more stable inorganics;
5) precipitation process is carried out in the water outlet after aerobic treatment, and mud enters sludge sump, upper strata clear water qualified discharge after treatment.
2. the treatment process of a kind of livestock class slaughterhouse wastewater as claimed in claim 1, it is characterized in that, described mechanical grille is two groups, and coarse grid is front, and thin grid is rear, and the gap that coarse rack deletes bar is 20mm, and the gap that fine fack deletes bar is 4mm.
3. the treatment process of a kind of livestock class slaughterhouse wastewater as claimed in claim 1, it is characterized in that, reciprocal oil-scraping device is installed on described oil trap top.
4. the treatment process of a kind of livestock class slaughterhouse wastewater as claimed in claim 1, it is characterized in that, described coagulative precipitation tank need add coagulation medicine and precipitate.
5. the treatment process of a kind of livestock class slaughterhouse wastewater as claimed in claim 4, it is characterized in that, described coagulation medicine is polymerize aluminum chloride.
6. the treatment process of a kind of livestock class slaughterhouse wastewater as claimed in claim 1, it is characterized in that, described Three-phase internal circulation biological fluidized bed Aerobic is also provided with fan jet flow aeration.
7. the treatment process of a kind of livestock class slaughterhouse wastewater as claimed in claim 1, it is characterized in that, in described step 5, sedimentation processing technology need add high-molecular biologic flocculation agent.
8. the treatment process of a kind of livestock class slaughterhouse wastewater as claimed in claim 7, it is characterized in that, described high-molecular biologic flocculation agent is one or more in polyglutamic acid, polycysteine.
9. the treatment process of a kind of livestock class slaughterhouse wastewater as claimed in claim 1, is characterized in that, described upper strata clear water need carry out disinfection by chlorine dioxide process up to standard after could discharge.
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Cited By (4)
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| CN106116062A (en) * | 2016-08-29 | 2016-11-16 | 武汉东川自来水科技开发有限公司 | The processing system of a kind of oil-polluted water and processing method |
| CN110104828A (en) * | 2019-05-07 | 2019-08-09 | 沭阳利民畜禽无害化处理有限公司 | A kind of dead livestock and poultry harmless treatment waste water treatment process |
| CN110550739A (en) * | 2019-09-29 | 2019-12-10 | 上海师范大学 | aerobic and anaerobic VBBR (viable but anaerobic) series coupling device and sewage treatment method |
| CN111606502A (en) * | 2020-05-18 | 2020-09-01 | 成都市科农动物无害化处置有限公司 | Harmless wastewater treatment process and system for livestock and poultry died of diseases |
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Cited By (4)
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| CN106116062A (en) * | 2016-08-29 | 2016-11-16 | 武汉东川自来水科技开发有限公司 | The processing system of a kind of oil-polluted water and processing method |
| CN110104828A (en) * | 2019-05-07 | 2019-08-09 | 沭阳利民畜禽无害化处理有限公司 | A kind of dead livestock and poultry harmless treatment waste water treatment process |
| CN110550739A (en) * | 2019-09-29 | 2019-12-10 | 上海师范大学 | aerobic and anaerobic VBBR (viable but anaerobic) series coupling device and sewage treatment method |
| CN111606502A (en) * | 2020-05-18 | 2020-09-01 | 成都市科农动物无害化处置有限公司 | Harmless wastewater treatment process and system for livestock and poultry died of diseases |
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Application publication date: 20151125 |