CN105271610A - Comprehensive processing process of culturing farm cow dung waste water - Google Patents
Comprehensive processing process of culturing farm cow dung waste water Download PDFInfo
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Abstract
The invention relates to a comprehensive processing technique of culturing farm cow dung waste water, and relates to the technical field of culturing farm waste processing. The processing process comprises the following steps: (1) liquid and solid parts of fresh cow dung water are separated primarily by a grating; (2) suspended impurities in the cow dung waste water are removed by further centrifuge and air-float; (3) organic pollutant and major part of nitrogen and phosphor compound are removed by using anaerobes and aerobes after the suspended impurities are removed; (4) biogas produced during the anaerobic treatment is purified to generate electricity, and residual heat from electricity generation is recycled; (5) microbe sludge produced during aerobic treatment is dehydrated and is decomposed; (6) the water, from which the organic compounds and the nitrogen and phosphor compounds are removed, is disinfected and then supplied to the breeding farm to flush cowhouse and irrigate the nearby farm land. The electricity generated in the comprehensive processing process can meet the requirement of a breeding farm; high quality organic fertilizer is produced; the comprehensive processing process needs small areas for processing cow dung; the utilization of waste as resource and harmlessness and zero emission are realized during the processing process.
Description
Technical field
The present invention relates to the technical field of plant's offal treatment, particularly a kind of livestock fecaluria focuses on qualified discharge and method of comprehensive utilization.
Background technology
The fast development of China's Dairy Industry, impel each large Dairy Company to set up the milk cow grassland of oneself one after another, these pasture cowboying population size differ, hundred at least, more than ten thousand at most.The pasture of this mass-producing, can produce a large amount of cow dung urine every day.According to statistics, a cow head average one day 20-25Kg that urinates, discharge feces just 30-40Kg.Cow dung, as a kind of animality fertilizer, itself is a kind of precious resources, can applies farmland and herbage.According to statistics, the cow dung that one cow head produces can meet the fertilizer demand in 5-8 mu farmland, therefore mostly is abroad cultivate corresponding milk cow according to the area of farmland or herbage, but domestic because of the restriction of each side condition, many pastures periphery not enough farmlands or herbage is dissolved the cow dung that milk cow produces.Therefore unnecessary cow dung must do further purifying treatment, is responsible for cause severe contamination to surrounding enviroment.
The mode of current domestic milk cow grassland cow dung process mainly contains compost and prepares biogas, solid part in cow dung can be prepared into fertilizer and take out by compost, prepare biogas and can produce clean energy, but these two kinds of modes all do not solve the liquid portion in cow dung, containing a large amount of organism and nitrogen phosphorus compound in cow manure wastewater, during direct discharge, these high concentrations of compounds can damage ecotope, for this reason, must do further process to waste water.
Mostly current domestic cow manure wastewater process is to adopt the technique of the double oxygen pool+aerobic ponds+wetland to process, the method treatment effect still can, but owing to mainly leaning on the biological degradation in physical environment, so its degraded load is very low, degradation time is also very long, this causes required floor space very large, and most dairy cow farm periphery there is no these pond bodies of Condition Construction.
Summary of the invention
For better solving the processing and utilizing problem of mass-producing milk cattle cultivating base cow dung urine; the invention provides a kind of comprehensive processing technique of cow manure wastewater; cow dung urine is carried out thorough comprehensive treating process and is become clean energy and organic fertilizer; and waste water is carried out keypoint treatment, discharge or reuse after making it to reach certain standard.For realizing above-mentioned functions, processing step of the present invention is as follows:
(1) fresh cow dung water carries out preliminary solid-liquid separation by grid;
(2) cow manure wastewater removes suspended impurity in water further through centrifugal and air supporting;
(3) remove the waste water after suspended impurity and remove organic pollutant and most of the nitrogen phosphorus compound by anaerobism and aerobic microbiological;
(4) biogas produced in anaerobic treatment process carries out purification and generates electricity and recycle generating waste-heat;
(5) microorganism sludge produced in Aerobic is fertile through the laggard windrow that dewaters;
(6) be temporary in clean water basin after the water after organics removal and nitrogen phosphorus compound is sterile-processed, rinse cowshed water and periphery farmland irrigation water for plant;
A kind of plant of the present invention cow manure wastewater integrated conduct method, the cow dung in step (1) is rinsed to collect through water and is imported after one coarse rack tackles non-cow dung foreign material under gravity in storage slag bath by channel; Be provided with diving mixing tank and submersible sewage pump in storage slag bath, cow dung water extraction is risen to twice specular Louvre and filters by the submersible sewage pump in storage slag bath; Twice grid bottom carries screw extrusion and transmitting function, can by filter after the direct extrusion dehydration of solid-state cow dung excrement slag and be sent to stockyard, solid-state cow dung excrement slag through dehydration after water ratio 60%-80%, the filtrate after filtration enters into intermediate pool.Described coarse rack grid gap is between 20-50mm, and specular Louvre grid gap is between 0.1-1mm.
A kind of plant of the present invention cow manure wastewater integrated conduct method, step (2) process is as follows: the filtrate after step (1) filtration enters into intermediate pool, is provided with diving mixing tank and outside pond, is furnished with mud conveying spiral pump in intermediate pool; The spiral pump of intermediate pool by waste water lifting to separating centrifuge, a small amount of coagulating agent PAC is added before spiral pump, inside whizzer, coagulating is there is after pump mixing, the separation of suspended substance is realized under centrifugal action, isolated solid-state cow dung excrement slag sends to compost, and the waste water after centrifugation enters into equalizing tank; Be provided with diving mixing tank and submersible sewage pump in equalizing tank, waste water is delivered to air flotation pool by the submersible sewage pump in equalizing tank; Air flotation pool is furnished with molten gas and chemicals dosing plant, and the most of suspension fiber under air supporting effect in waste water is removed, and scum silica frost sends into sludge thickener; Air supporting water outlet enters into hydrolysis acidification pool, diving mixing tank is provided with in hydrolysis acidification pool, the microorganism in a large number with acidication effect is there is in hydrolysis acidification pool, larger molecular organics in waste water can be converted into small organic molecule after composition Contact-sorption in these microorganisms and waste water, organonitrogen and organophosphorus are converted into ammonia nitrogen and inorganic phosphorus, hydrolysis acidification pool water outlet directly enters into anaerobic pond simultaneously.
A kind of plant of the present invention cow manure wastewater integrated conduct method, diving mixing tank is provided with in step (3) anaerobic pond, a large amount of methanogen floras is there is in anaerobic pond, the small organic molecule in water can be absorbed, be decomposed into the gas such as water and CH4, CO2, these gases are biogas; Anaerobic pond water outlet enters people to settling tank, in settling tank, realize mud-water separation, and the mud precipitated is back to front end hydrolysis acidification pool and anaerobic pond by sludge pump, and to guarantee the microbial biomass in pond, settling tank water outlet directly enters into aerobic treatment unit; Aerobic treatment unit adopts AAO treatment process form, and establish diving mixing tank in A1 and A2 section, establish aerating system and nitrification liquid reflux pump in 0 section, mixed liquid recycle ratio controls at 200%-400%, and aerobic treatment unit 15 water outlet enters into second pond
A kind of plant of the present invention cow manure wastewater integrated conduct method, the biogas that in step (4), anaerobic pond produces generates electricity by directly supplying biogas generator after marsh gas purifying unit desulfurization dewatering after collecting by the road, Suo Fa electrical energy fed plant uses by oneself, and the waste heat that biogas generator produces supplies plant and uses after heat recovery boiler reclaims.
A kind of plant of the present invention cow manure wastewater integrated conduct method, in step (5), the water outlet of aerobic treatment unit is muddy water mixed solution, mud-water separation is realized in second pond, after precipitation, water outlet enters into sterilization pool, the precipitating sludge partial reflux of second pond is to the A1 section of aerobic treatment unit, and another part excess sludge is sent in sludge thickener; Be provided with central transmission concentrator in sludge thickener, scum silica frost air flotation pool and second pond sent here, mud concentrate, and the supernatant liquor overflow of concentration basin is in storage slag bath, and thickened sludge is delivered to water extracter and dewatered; Solid sludges water ratio after dehydration is below 80%, and directly send to the solid-state cow dung excrement slag produced with step 1, step 2 and mix laggard windrow fertilizer and prepare fertilizer, pressing filtering liquid is back in storage slag bath.
A kind of plant of the present invention cow manure wastewater integrated conduct method, second pond described in step (5) adopts vertical sedimentation basin, described water extracter adopts belt filter press, and this belt filter press is furnished with screw-rod delivery pump and dosing pump, and institute's adding medicine is flocculation agent PAM polyacrylamide.
A kind of plant of the present invention cow manure wastewater integrated conduct method, the supernatant water outlet of the second pond in step (6) enters into sterilization pool, this sterilization pool is supporting disinfectant feeding device, adding sterilizing agent is herein NaCl0, the contact sterilizing time is 35-60min, and sterilization pool water outlet enters into clean water basin; Clean water basin to be sterilized water outlet in order to temporary reservoir, and clean water basin pond holds more than 10 times for the system day process water yield, and clean water basin are furnished with reuse water pump, and a part is back to use plant and rinses cowshed, and a part supplies periphery farmland, herbage irrigation water.
A kind of plant of the present invention cow manure wastewater integrated conduct method, sterilization pool described in step (6) adopts uv sterilisation form.
Figure of description
Fig. 1 is each process flow diagram of the present invention
Each Reference numeral implication is as follows: cowshed and milking center 1, coarse rack 2, storage slag bath 3, specular Louvre 4, intermediate pool 5, sleeping spiral shell separating centrifuge 6, equalizing tank 7, air flotation pool 8, sludge thickener 17, hydrolysis acidification pool 9, anaerobic pond 10, clean unit 11, biogas generator 12, heat recovery boiler 13, settling tank 14, aerobic treatment unit 15, second pond 16, sterilization pool 19, sludge thickener 17, water extracter 18, clean water basin 20
Embodiment
Below in conjunction with accompanying drawing, processing step of the present invention is described in detail:
As shown in Figure 1:
1) the cow dung water that in dairy cow farm, cowshed and milking center 1 produce is imported in storage slag bath 3 under gravity by channel after collecting after one coarse rack 2 tackles non-cow dung foreign material, coarse rack grid gap is 50mm, be mainly used to filter out large impurity substances, non-cow dung is part waste just;
2) diving mixing tank and submersible sewage pump is provided with in storage slag bath 3, cow dung water extraction is risen to twice specular Louvre 4 and filters by the submersible sewage pump in storage slag bath 3, for removing most excrement slag, twice specular Louvre grid gap is respectively 1mm and 0.1mm, and grid bottom carries screw extrusion and transmitting function device, the direct extrusion dehydration of filter residue after filtering can be sent to stockyard and directly carry out compost treatment as fertilizer, the filtrate after filtration enters into intermediate pool 5;
3) be provided with diving mixing tank in intermediate pool 5 and outside pond, be furnished with mud conveying spiral pump;
4) spiral pump of intermediate pool 5 is by extremely sleeping for waste water lifting spiral shell separating centrifuge 6, a small amount of coagulating agent PAC is added before spiral pump, inside whizzer, coagulating is there is after pump mixing, the separation of suspended substance is realized under centrifugal action, most of suspension fiber residual in cow manure wastewater after centrifugal can be removed, isolated solid excrement slag sends to compost, and the waste water after centrifugation enters into equalizing tank 7;
5) be provided with diving mixing tank and submersible sewage pump in equalizing tank 7, waste water is delivered to air flotation pool 8 by the submersible sewage pump in equalizing tank 7;
6) air flotation pool 8 is furnished with molten gas and chemicals dosing plant, and the most of suspension fiber under air supporting effect in waste water is removed, and scum silica frost sends into sludge thickener 17;
7) cow manure wastewater after air-flotation process gets rid of suspended substance and fine-fibered substantially, but dissolved organic matter is wherein also very high, also remain the fine-fibered of micron level nearly, need further biological treatment, air supporting water outlet enters into hydrolysis acidification pool 9, diving mixing tank is provided with in hydrolysis acidification pool 9, the microorganism in a large number with acidication effect is there is in hydrolysis acidification pool 9, larger molecular organics in waste water can be converted into small organic molecule after composition Contact-sorption in these microorganisms and waste water, organonitrogen and organophosphorus are converted into ammonia nitrogen and inorganic phosphorus simultaneously, mixed stirring device is provided with in hydrolysis acidification pool 9, acidication effect can be strengthened, hydrolysis acidification pool water outlet directly enters into anaerobic pond 10,
8) be provided with diving mixing tank in anaerobic pond 10, there is a large amount of methanogen floras in anaerobic pond 10, the small organic molecule that can absorb in water is synthesized own cells, is decomposed into the gas such as water and CH4, CO2, and these gases are biogas;
9) water outlet of anaerobic pond 10 is overflow type, part anaerobion can be contained in water outlet, in order to ensure anaerobism effect and reduce follow-up load, anaerobic pond 10 water outlet enters people to settling tank 14, in settling tank 14, realize mud-water separation, the mud precipitated is back to front end hydrolysis acidification pool 9 and anaerobic pond 10 by sludge pump, to guarantee the microbial biomass in pond, ensure biological degradation effect, settling tank 14 water outlet directly enters into aerobic treatment unit 15;
10) aerobic treatment unit 15 adopts AAO treatment process form, diving mixing tank is established in A1 and A2 section, establish aerating system and nitrification liquid reflux pump in 0 section, mixed liquid recycle ratio controls at 200%-400%, and aerobic treatment unit 15 water outlet enters into second pond 16;
11) biogas generates electricity by directly supplying biogas generator 12 after marsh gas purifying unit 11 desulfurization dewatering after collecting by the road, Suo Fa electrical energy fed plant uses by oneself, and it is used that the waste heat that biogas generator 12 produces supplies plant's winter warming after heat recovery boiler 13 reclaims;
12) water outlet of aerobic treatment unit 15 is muddy water mixed solutions, mud-water separation can be realized in second pond 16, this place's second pond 16 adopts vertical sedimentation basin, after precipitation, water outlet enters into sterilization pool 19, the precipitating sludge partial reflux of second pond 16 is to the A1 section of aerobic treatment unit 15, and another part excess sludge is sent in sludge thickener 17;
13) be provided with central transmission concentrator in sludge thickener 17, scum silica frost air flotation pool 8 and second pond 16 can sent here, mud concentrate, and the supernatant liquor overflow of concentration basin 17 is in storage slag bath 3, and thickened sludge is delivered to water extracter 18 and dewatered;
14) this place's water extracter 18 adopts the belt filter press that dehydrating effect is good, this belt filter press is furnished with screw-rod delivery pump and dosing pump, institute's adding medicine is PAM (polyacrylamide), solid sludges water ratio after dehydration is below 80%, directly can send to the solid-state excrement with leading portion to mix laggard windrow fertilizer and prepare fertilizer, pressing filtering liquid is back in storage slag bath 3;
15) indices such as supernatant outlet water organic substance of second pond has reached related request, but excrement colibacillus group wherein and roundworm egg index are still not up to standard, therefore the water outlet of second pond 16 supernatant enters into sterilization pool 19, this sterilization pool is supporting disinfectant feeding device, adding sterilizing agent is herein NaCl0, the contact sterilizing time is 35-60min, and sterilization pool water outlet enters into clean water basin 20;
16) the water outlet indices of sterilization pool 19 reaches " livestock and poultry breeding industry pollutant emission standard " (GB18596-2001) and " urban sewage reutilization farmland irrigation water water quality " (GB20922-2007) requirement, clean water basin 20 are in order to temporary reservoir sterilization water outlet, in order to good regulating pondage, clean water basin 20 pond holds more than 10 times for the system day process water yield, clean water basin 20 are furnished with reuse water pump, a part is back to use plant and rinses cowshed, part supply periphery farmland, herbage irrigation water.
As other embodiments of the present invention, described coarse rack grid gap elects 20mm as, twice specular Louvre grid gap is respectively 0.5mm and 0.2mm, Aerobic biological process unit 15 also can adopt the technique units such as AO, SBR, CASS, oxidation ditch, and the form of the second pond 16 after aerobic treatment unit also can adopt flat flow, width streaming according to the water yield; Sludge dewatering equipment 18 form can be the forms such as belt filter press, butterfly spiral shell water extracter, centrifuge and plate-and-frame filter press; The disinfectant that sterilization pool adds can be chlorine, dioxide peroxide, ozone, clorox, and sterilization pool 19 also can adopt uv sterilisation form, and its processing power all reaches desired result.
Most preferred embodiment of the present invention is illustrated, and the various change made by those of ordinary skill in the art or remodeling all can not depart from the scope of the present invention.
Claims (10)
1. plant's cow manure wastewater integrated conduct method, is characterized in that comprising the following steps:
(1) fresh cow dung water carries out preliminary solid-liquid separation by grid;
(2) cow manure wastewater removes suspended impurity in water further through centrifugal and air supporting;
(3) remove the waste water after suspended impurity and remove organic pollutant and most of the nitrogen phosphorus compound by anaerobism and aerobic microbiological;
(4) biogas produced in anaerobic treatment process carries out purification and generates electricity and recycle generating waste-heat;
(5) microorganism sludge produced in Aerobic is fertile through the laggard windrow that dewaters;
(6) be temporary in clean water basin after the water after organics removal and nitrogen phosphorus compound is sterile-processed, rinse cowshed water and periphery farmland irrigation water for plant.
2. a kind of plant according to claim 1 cow manure wastewater integrated conduct method, is characterized in that the cow dung in step (1) is imported in storage slag bath by channel under gravity through water flushing collection after one coarse rack tackles non-cow dung foreign material; Be provided with diving mixing tank and submersible sewage pump in storage slag bath, cow dung water extraction is risen to twice specular Louvre and filters by the submersible sewage pump in storage slag bath; Twice grid bottom carries screw extrusion and transmitting function, can by filter after the direct extrusion dehydration of solid-state cow dung excrement slag and be sent to stockyard, solid-state cow dung excrement slag through dehydration after water ratio 60%-80%, the filtrate after filtration enters into intermediate pool.
3. a kind of plant according to claim 2 cow manure wastewater integrated conduct method, it is characterized in that described coarse rack grid gap is between 20-50mm, specular Louvre grid gap is between 0.1-1mm.
4. a kind of plant according to claim 3 cow manure wastewater integrated conduct method, it is characterized in that step (2) process is as follows: the filtrate after step (1) filtration enters into intermediate pool, is provided with diving mixing tank and outside pond, is furnished with mud conveying spiral pump in intermediate pool; The spiral pump of intermediate pool by waste water lifting to separating centrifuge, a small amount of coagulating agent PAC is added before spiral pump, inside whizzer, coagulating is there is after pump mixing, the separation of suspended substance is realized under centrifugal action, isolated solid-state cow dung excrement slag sends to compost, and the waste water after centrifugation enters into equalizing tank; Be provided with diving mixing tank and submersible sewage pump in equalizing tank, waste water is delivered to air flotation pool by the submersible sewage pump in equalizing tank; Air flotation pool is furnished with molten gas and chemicals dosing plant, and the most of suspension fiber under air supporting effect in waste water is removed, and scum silica frost sends into sludge thickener; Air supporting water outlet enters into hydrolysis acidification pool, diving mixing tank is provided with in hydrolysis acidification pool, the microorganism in a large number with acidication effect is there is in hydrolysis acidification pool, larger molecular organics in waste water can be converted into small organic molecule after composition Contact-sorption in these microorganisms and waste water, organonitrogen and organophosphorus are converted into ammonia nitrogen and inorganic phosphorus, hydrolysis acidification pool water outlet directly enters into anaerobic pond simultaneously.
5. a kind of plant according to claim 4 cow manure wastewater integrated conduct method, it is characterized in that being provided with diving mixing tank in step (3) anaerobic pond, a large amount of methanogen floras is there is in anaerobic pond, the small organic molecule in water can be absorbed, be decomposed into the gas such as water and CH4, CO2, these gases are biogas; Anaerobic pond water outlet enters people to settling tank, in settling tank, realize mud-water separation, and the mud precipitated is back to front end hydrolysis acidification pool and anaerobic pond by sludge pump, and to guarantee the microbial biomass in pond, settling tank water outlet directly enters into aerobic treatment unit; Aerobic treatment unit adopts AAO treatment process form, and establish diving mixing tank in A1 and A2 section, establish aerating system and nitrification liquid reflux pump in 0 section, mixed liquid recycle ratio controls at 200%-400%, and aerobic treatment unit 15 water outlet enters into second pond.
6. a kind of plant according to claim 5 cow manure wastewater integrated conduct method, it is characterized in that the biogas of anaerobic pond generation in step (4) after collecting by the road by directly supply biogas generator generating after marsh gas purifying unit desulfurization dewatering, Suo Fa electrical energy fed plant uses by oneself, and the waste heat that biogas generator produces supplies plant and uses after heat recovery boiler reclaims.
7. a kind of plant according to claim 6 cow manure wastewater integrated conduct method, it is characterized in that the water outlet of aerobic treatment unit is muddy water mixed solution in step (5), mud-water separation is realized in second pond, after precipitation, water outlet enters into sterilization pool, the precipitating sludge partial reflux of second pond is to the A1 section of aerobic treatment unit, and another part excess sludge is sent in sludge thickener; Be provided with central transmission concentrator in sludge thickener, scum silica frost air flotation pool and second pond sent here, mud concentrate, and the supernatant liquor overflow of concentration basin is in storage slag bath, and thickened sludge is delivered to water extracter and dewatered; Solid sludges water ratio after dehydration is below 80%, and directly send to the solid-state cow dung excrement slag produced with step 1, step 2 and mix laggard windrow fertilizer and prepare fertilizer, pressing filtering liquid is back in storage slag bath.
8. a kind of plant according to claim 7 cow manure wastewater integrated conduct method, it is characterized in that second pond described in step (5) adopts vertical sedimentation basin, described water extracter adopts belt filter press, this belt filter press is furnished with screw-rod delivery pump and dosing pump, and institute's adding medicine is flocculation agent PAM polyacrylamide.
9. a kind of plant according to claim 8 cow manure wastewater integrated conduct method, it is characterized in that the supernatant water outlet of the second pond in step (6) enters into sterilization pool, this sterilization pool is supporting disinfectant feeding device, adding sterilizing agent is herein NaClO, the contact sterilizing time is 35-60min, and sterilization pool water outlet enters into clean water basin; Clean water basin to be sterilized water outlet in order to temporary reservoir, and clean water basin pond holds more than 10 times for the system day process water yield, and clean water basin are furnished with reuse water pump, and a part is back to use plant and rinses cowshed, and a part supplies periphery farmland, herbage irrigation water.
10. a kind of plant according to claim 9 cow manure wastewater integrated conduct method, is characterized in that sterilization pool described in step (6) adopts uv sterilisation form.
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| CN111392965A (en) * | 2020-03-25 | 2020-07-10 | 青岛格瑞盛环保工程有限公司 | Large-scale dairy farm wastewater rapid treatment method |
| CN112661354A (en) * | 2020-12-21 | 2021-04-16 | 西安鼎研科技股份有限公司 | System and method for treating breeding wastewater of dairy farm |
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