CN102732425B - Method for producing microalgae through utilizing livestock and poultry excrement primary wastewater - Google Patents
Method for producing microalgae through utilizing livestock and poultry excrement primary wastewater Download PDFInfo
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Abstract
The invention discloses a method for producing microalgae through utilizing livestock and poultry excrement primary wastewater. The method comprises the following steps: 1, wastewater processing: flocculating the livestock and poultry excrement primary wastewater, taking the resulting supernatant, adding water to dilute to the COD being below 1000mg/L, letting ozone in to carry out aeration disinfection, and allowing the obtained mixture to stand; and 2, microalga culture: inoculating alga strains into the liquid obtained in step 1, carrying out illumination culture, letting air in during the culture process, and letting CO2 in to maintain the pH value of the liquid at 5-7. The preprocessing method of the livestock and poultry excrement primary wastewater allows the microalgae to be cultured through using the primary wastewater without wastewater anaerobic digestion, and complex florae in the wastewater to be removed through ozone disinfection, so the culture system stably runs, the culture cost of the microalgae is reduced, the biomass of the microalgae is improved, and it is in favor of the realization of the scale culture of the microalgae, and the resource utilization of the livestock and poultry excrement wastewater.
Description
Technical field
The present invention relates to a kind of method of utilizing feces of livestock and poultry primary wastewater to produce micro-algae.
Background technology
Our times energy system is being faced with to the rapid transformation of the energy supply system of low-carbon (LC), efficient, environmental protection.But there is lack of raw materials serious its mass-producing of restriction and industrialization, raw material has become the principal element that determines biofuel price.For ensureing that the development of Future in China biofuel has great significance, and uses micro-algae resource to become the study hotspot of current field of biodiesel oil as the oil sources object of biofuel.
Micro-algae is that a class is made a living with freshwater, and growth and breeding is rapid, and biomass is large, can utilize photoautotrophy, sustainable supply biomass resource, and utilizing waste water of livestock poultry cultivating microalgae is the fabulous bridge of realizing the production of biomass low-cost industrial and discharge of wastewater resource utilization.It is advantageous that: 1. micro-algae has high photosynthesis ability, can effectively utilize sun power fixation of C O
2, inorganics is converted into hydrogen, high unsaturated alkane, grease equal energy source material.2. the oleaginousness of micro-algae is higher, and the grease that production of units area is produced is generally higher than oil crops; 3. in waste water of livestock poultry, cultivating microalgae can effectively reduce costs; The renewable energy resources technology of waste water of livestock poultry cultivating microalgae has environmental protection and economy, meets the unique advantage of nature circulation.
Present stage micro-algae cultivation mainly in synthetic medium, take carbonic acid gas as carbon source, under the condition of illumination and mix and blend; Cost is higher; Micro-algae can be used for the deep purifying of secondary waste water traditionally, and adopt through the livestock and poultry of anaerobic treatment and the secondary waste water of sanitary wastewater and carry out both culturing microalgae, to overcome higher organic content, the inhibition to micro algae growth of complicated flora and water turbidity.In this area, feces of livestock and poultry primary wastewater refers to the waste water obtaining after the feces of livestock and poultry of its feeding field staticly settles, and secondary waste water refers to that primary wastewater carries out the waste water after anaerobic treatment.Because anaerobic digestion needs very large reaction volume and investment, more domestic middle-size and small-size its feeding fields do not have anaerobic processing device, thereby need development effectively, simple and can utilize the method for pig farm primary wastewater cultivating microalgae, realize micro-algae and in feces of livestock and poultry primary wastewater, utilize abundant organic matter, be converted into biomass and accumulate the resource utilization of grease.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method of utilizing feces of livestock and poultry primary wastewater to produce micro-algae, comprise the steps:
1) wastewater treatment: feces of livestock and poultry primary wastewater is carried out to flocculation treatment, get supernatant liquor, being diluted with water to COD is below 1000mg/L, passes into ozonation aerated sterilizing, then standing;
2) micro-algae is cultivated: algae kind is inoculated in step 1) gained liquid, carries out illumination cultivation, pass into air in culturing process, and pass into CO
2to maintain liquid pH value 5 ~ 7.
As optimal technical scheme, the above-mentioned feces of livestock and poultry primary wastewater of utilizing is produced the method for micro-algae, in step 1), pass into ozonation aerated sterilizing, make more than ozone concn in liquid reaches 2.8 mg/L, then standing ozone concn to liquid is down to below 0.1mg/L.
As optimal technical scheme, the above-mentioned feces of livestock and poultry primary wastewater of utilizing is produced the method for micro-algae, and step 1) be take chitosan and feces of livestock and poultry primary wastewater carried out to flocculation treatment as coagulant aids as flocculation agent, the sodium alginate of take.Preferably, chitosan and sodium alginate add feces of livestock and poultry primary wastewater to carry out flocculation treatment with the ratio of 5 ~ 10g/L respectively.
As optimal technical scheme, the above-mentioned feces of livestock and poultry primary wastewater of utilizing is produced the method for micro-algae, and step 1) is carried out flocculation treatment to feces of livestock and poultry primary wastewater, gets supernatant liquor, and being diluted with water to COD is 500 ~ 1000mg/L.
As optimal technical scheme, the above-mentioned feces of livestock and poultry primary wastewater of utilizing is produced the method for micro-algae, step 2) the micro-algae that is cultured to logarithmic phase is inoculated in step 1) gained liquid with 5 ~ 20% inoculum size.
As optimal technical scheme, the above-mentioned feces of livestock and poultry primary wastewater of utilizing is produced the method for micro-algae, step 2) the micro-algae temperature of cultivating is 25 ℃ ~ 35 ℃.
As optimal technical scheme, the above-mentioned feces of livestock and poultry primary wastewater of utilizing is produced the method for micro-algae, step 2) intensity of illumination of illumination cultivation is 2000 lux ~ 4000 lux.
As optimal technical scheme, the above-mentioned feces of livestock and poultry primary wastewater of utilizing is produced the method for micro-algae, step 2) incubation time cultivated of micro-algae is 10 ~ 15 days.
As optimal technical scheme, the above-mentioned feces of livestock and poultry primary wastewater of utilizing is produced the method for micro-algae, step 2) algae kind is inoculated in step 1) gained liquid, carry out illumination cultivation, in culturing process, successively pass into air, intermittently pass into carbonic acid gas, passing into by pH controller of carbonic acid gas controlled, and pH passes into the constant cultivation that carbonic acid gas maintains pH value 5 ~ 7 while raising.
The invention has the beneficial effects as follows:
The present invention utilizes feces of livestock and poultry primary wastewater to produce the method for micro-algae, walks around the anaerobic digestion of elementary feces of livestock and poultry waste water.Because investment is huge and residence time water treatment is too high, make a lot of middle-size and small-size its feedings field there is no the anaerobic treatment equipment of feces of livestock and poultry primary wastewater, and the pretreatment process of elementary feces of livestock and poultry waste water of the present invention, can be in the situation that not possessing wastewater anaerobic digestive, use primary wastewater cultivating microalgae, ozone sterilization can be removed flora complicated in waste water, make cultivating system stable, reduce the cultivation cost of micro-algae, improve the biomass of micro-algae, be conducive to realize the scale cultivation of micro-algae and the resource utilization of feces of livestock and poultry waste water.
Accompanying drawing explanation
Fig. 1 is the liquid of different COD initial values after pig manure primary wastewater flocculation in the specific embodiment of the invention, supernatant liquor dilution, after ozone sterilization, aeration, and COD change procedure figure in micro-algae culturing process.
Fig. 2 is the liquid of different COD initial values after pig manure primary wastewater flocculation in the specific embodiment of the invention, supernatant liquor dilution, after ozone sterilization, aeration, and total nitrogen content change procedure figure in micro-algae culturing process.
Fig. 3 is the liquid of different COD initial values after pig manure primary wastewater flocculation in the specific embodiment of the invention, supernatant liquor dilution, after ozone sterilization, aeration, and total phosphorous change procedure figure in micro-algae culturing process.
Fig. 4 is the liquid of different COD initial values after pig manure primary wastewater flocculation in the specific embodiment of the invention, supernatant liquor dilution, after ozone sterilization, aeration, and ammonia-nitrogen content change procedure figure in micro-algae culturing process.
Fig. 5 is related to schematic diagram between ozone concn and sterilization rate in liquid in embodiment.
Fig. 6 passes into gas with various, the figure of the cell density of chlorella and fat content in culturing process in embodiment.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described, can be implemented, but illustrated embodiment is not as a limitation of the invention so that those skilled in the art can better understand the present invention also.
Below describe an embodiment (utilizing pig manure primary wastewater) who utilizes the method that livestock and poultry primary wastewater produces micro-algae provided by the invention in detail, specifically comprise the following steps:
1) pretreatment mode of pig manure primary wastewater: add flocculation agent chitosan and coagulant aids sodium alginate with the ratio of 5-10g/L in pig manure primary wastewater respectively, carry out flocculation treatment, the pH of flocculation is between 5.0 ~ 7.0.In the supernatant liquor obtaining after flocculation, not to the virulent composition of the growth of micro-algae, can make algae normal growth.The elementary waste liquid of supernatant pig manure obtaining is diluted to initial COD value and is respectively 500 mg/L ~ 1000 mg/L.Pass into more than ozone to its concentration reaches 2.8mg/L, after ozonize, sterilization rate reaches more than 97%.After standing, make the ozone concn in liquid be reduced to 0.1mg/L following (ozone concn does not affect the growth of micro-algae at 0.1mg/L).
2) micro-algae is cultivated: the chlorella that is cultured to logarithmic phase is inoculated into respectively in step 1 gained liquid by 5 ~ 20% inoculum size (being preferably 10% inoculum size), carries out aerated culture, the temperature of cultivation is 25 ℃ ~ 35 ℃.In culturing process, with pneumatic pump, pass into the air (speed that passes into that is air in the nutrient solution of 1L is 100 mL/min) of 100mL/minL always, passing into by pH controller of carbonic acid gas controlled, pH can pass into the constant cultivation that carbonic acid gas maintains pH value 5 ~ 7 while raising, to avoid the passing into growth that carbonic acid gas can cause the acidifying of nutrient solution and affect micro-algae always, avoid the waste of carbonic acid gas simultaneously.Intensity of illumination 2000lux ~ 4000lux, is preferably 2000lux ~ 3000lux, and incubation time is 10 ~ 15 days.
In the specific implementation, the algae kind that the present embodiment adopts is
chlorella pyrenoidosa, aeration after 24 hours the ozone concn in liquid manure be 0.1mg/L, the growth of chlorella is not exerted an influence, can tolerate 1000mg COD/L pig manure primary wastewater, the raising of COD can cause the raising of nutrient solution turbidity and affect the normal growth of micro-algae.In the pig manure water without ozone sterilization, the growth of chlorella is unstable, usually causes the chlorella dead phenomenon of turning to be yellow, through many experiments result, prove, after ozone sterilization, culture system is stable, and incubation time is generally 10 ~ 13 days can gather in the crops frond, and water purification process also reaches balance.
In the specific implementation, in the present embodiment, with pH, control the intake of carbonic acid gas, compare with the conventional method that passes into 5% carbonic acid gas and air Mixture in culturing process always, biomass and the fat content of final frond are close, the decontamination effect improving of waste water is also similar, but effectively utilized carbonic acid gas, utilized the organic matter in pig manure waste water simultaneously, the biomass of acquisition is 3 ~ 4 times that in synthetic medium, cultivate.
Embodiment 1
1) pretreatment mode of pig manure primary wastewater: add flocculation agent chitosan work and coagulant aids sodium alginate with the ratio of 10g/L in pig manure primary wastewater respectively, carry out flocculation treatment, the pH of flocculation is between 5.0 ~ 7.0.The elementary waste liquid of supernatant pig manure obtaining is diluted to initial COD value and is respectively 500mg/L, 700mg/L, 800mg/L, 1000mg/L.Pass into more than ozone to its concentration reaches 2.8mg/L, after ozonize, sterilization rate reaches more than 97%.Aeration makes the ozone concn in liquid be reduced to 0.072mg/L.
2) micro-algae is cultivated: the chlorella that is cultured to logarithmic phase is inoculated in step 1 gained liquid by 10% inoculum size, carries out aerated culture, the temperature of cultivation is 25 ℃ ~ 35 ℃.In culturing process, with pneumatic pump, pass into the air of 100mL/minL always, passing into by pH controller of carbonic acid gas controlled, pH can pass into the constant cultivation that carbonic acid gas maintains pH value 5 ~ 7 while raising, to avoid the passing into growth that carbonic acid gas can cause the acidifying of nutrient solution and affect micro-algae always, avoid the waste of carbonic acid gas simultaneously.Intensity of illumination 2000lux ~ 4000lux, incubation time is 14 days.
Detect the change procedure of the waste water indices of different COD initial values in micro-algae culturing process.Shown in Fig. 1 ~ 4, follow the cultivation of chlorella, COD value, total nitrogen content, total phosphorous and the ammonia-nitrogen content of waste water constantly reduce, cultivate chlorella after 12 ~ 13 days, initial COD value is the waste water of 500mg/L, 700mg/L, 800mg/L, 1000mg/L: COD value is all reduced to 300mg/L left and right, total nitrogen content is all down to below 20 mg/L, and total phosphorous is all down to below 5 mg/L, and ammonia-nitrogen content is all down to below 5mg/L.Illustrate that utilizing method of the present invention to cultivate chlorella can carry out recycling treatment to feces of livestock and poultry primary wastewater effectively.
Embodiment 2
The pretreatment mode of pig manure primary wastewater: add flocculation agent chitosan work and coagulant aids sodium alginate with the ratio of 5 g/L in pig manure primary wastewater respectively, carry out flocculation treatment, the pH of flocculation is between 5.0 ~ 7.0.The elementary waste liquid of supernatant pig manure obtaining is diluted to initial COD value for 800mg/L.Pass into ozone to its concentration and reach respectively 2.58 mg/L, 2.86 mg/L, 3.1 mg/L, detect sterilization rate.
As shown in Figure 5, passing into ozone to concentration is that after 2.58 mg/L, sterilization rate is only 60% left and right, and pass into ozone to concentration, is that after 2.86 mg/L or 3.1 mg/L, sterilization rate can reach more than 97%.For economy principle, ozone sterilization of the present invention preferably passes into ozone concn more than 2.8mg/L.
Embodiment 3
1) pretreatment mode of pig manure primary wastewater: add flocculation agent chitosan work and coagulant aids sodium alginate with the ratio of 8 g/L in pig manure primary wastewater respectively, carry out flocculation treatment, the pH of flocculation is between 5.0 ~ 7.0.The elementary waste liquid of supernatant pig manure obtaining is diluted to initial COD value and is respectively 1000 mg/L.Pass into more than ozone to its concentration reaches 2.8mg/L, after ozonize, sterilization rate reaches more than 97%.Aeration is reduced to below 0.1mg/L the ozone concn in liquid.
2) micro-algae is cultivated: the chlorella that is cultured to logarithmic phase is inoculated into respectively in step 1 gained liquid by the inoculum size of 15 %, carries out aerated culture, the temperature of cultivation is 25 ℃ ~ 35 ℃.In culturing process, with passing in the following manner respectively gas: a., only with pneumatic pump, pass into continuously air always; B. pass into continuously the gas mixture of carbonic acid gas and air, with gas mixing device, making the wherein volume percent of carbonic acid gas is 5%; C. with pneumatic pump, pass into continuously air, passing into by pH controller of carbonic acid gas controlled, pH passes into the constant cultivation that carbonic acid gas maintains pH value 5 ~ 7 while raising, and to avoid the passing into growth that carbonic acid gas can cause the acidifying of nutrient solution and affect micro-algae always, avoids the waste of carbonic acid gas simultaneously.Intensity of illumination is 2000lux ~ 3000lux, and incubation time is 10 ~ 15 days.
Result as shown in Figure 6, when only passing into air with mode a, the very low about 1.1g/L of biomass, oil quantity is 22% left and right; And while passing into continuously the gas mixture of carbonic acid gas and air with mode b, biomass is about 1.9 g/L, oil quantity is 30% left and right; With mode c pneumatic pump, pass into continuously air, passing into by pH controller of carbonic acid gas controlled, and pH passes into the constant cultivation that carbonic acid gas maintains pH value 5 ~ 7 while raising, biomass is about 1.8 g/L, oil quantity is 30% left and right, and it can reach the effect of mode b, has avoided the waste of carbonic acid gas simultaneously.
To sum up, core of the present invention is to make feces of livestock and poultry primary wastewater to cultivate micro-algae becomes possibility, reduces the cost that micro-algae is cultivated, and reduces every sewage index of feces of livestock and poultry primary wastewater simultaneously, carries out the recycling treatment of waste water.
The present invention considers that many middle-size and small-size its feedings factory does not have the treatment facility of processing excrement and urine water, provide simply and effectively to feces of livestock and poultry primary wastewater carry out with pre-treatment after cultivate micro-algae method, effectively reduce the COD of feces of livestock and poultry waste water, total nitrogen, total phosphorus and ammonia nitrogen, obtain micro-algae of resourcebility simultaneously, be conducive to the development of the industrialization of micro-algae and the processing engineering of pig manure waste water.
The above embodiment is only the preferred embodiment for absolutely proving that the present invention lifts, and protection scope of the present invention is not limited to this.Being equal to that those skilled in the art do on basis of the present invention substitutes or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (4)
1. utilize feces of livestock and poultry primary wastewater to produce a method for micro-algae, it is characterized in that, comprise the steps:
1) wastewater treatment: the chitosan of take carries out flocculation treatment to feces of livestock and poultry primary wastewater as coagulant aids as flocculation agent, the sodium alginate of take, wherein, chitosan adds feces of livestock and poultry primary wastewater with the ratio of 5 ~ 10g/L, sodium alginate adds feces of livestock and poultry primary wastewater with the ratio of 5 ~ 10g/L, get supernatant liquor, being diluted with water to COD is below 1000mg/L, pass into ozonation aerated sterilizing, make more than ozone concn in liquid reaches 2.8 mg/L, then standing ozone concn to liquid is down to below 0.1mg/L;
2) micro-algae is cultivated: algae kind is inoculated in step 1) gained liquid, intensity of illumination with 2000lux ~ 4000lux is carried out illumination cultivation, incubation time is 10 ~ 15 days, in culturing process, successively pass into air, intermittently pass into carbonic acid gas, passing into by pH controller of carbonic acid gas controlled, and pH passes into the constant cultivation that carbonic acid gas maintains pH value 5 ~ 7 while raising.
2. the method for utilizing feces of livestock and poultry primary wastewater to produce micro-algae according to claim 1, is characterized in that, step 1) is carried out flocculation treatment to feces of livestock and poultry primary wastewater, gets supernatant liquor, and being diluted with water to COD is 500 ~ 1000mg/L.
3. the method for utilizing feces of livestock and poultry primary wastewater to produce micro-algae according to claim 1, is characterized in that step 2) the micro-algae that is cultured to logarithmic phase is inoculated in step 1) gained liquid with 5 ~ 20% inoculum size.
4. the method for utilizing feces of livestock and poultry primary wastewater to produce micro-algae according to claim 1, is characterized in that step 2) incubation time cultivated of micro-algae is 10 ~ 15 days.
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| CN107151055B (en) * | 2017-06-01 | 2021-01-01 | 中国农业大学 | Value-added utilization method for livestock and poultry wastewater environment |
| CN107384832B (en) * | 2017-08-28 | 2020-06-09 | 中国科学院水生生物研究所 | Method for culturing nitrogen-fixing blue algae in large quantity at low cost |
| CN110408544A (en) * | 2019-09-02 | 2019-11-05 | 浙江海洋大学 | Utilize the method for aquiculture waste water culture microalgae |
| CN112028251A (en) * | 2020-09-03 | 2020-12-04 | 上饶师范学院 | Method for improving ammonia nitrogen removal effect of microalgae on livestock and poultry breeding wastewater |
| CN111944735B (en) * | 2020-09-03 | 2023-07-04 | 上饶师范学院 | Method for promoting microalgae to grow in livestock and poultry breeding wastewater |
| CN112159261A (en) * | 2020-10-10 | 2021-01-01 | 天津科技大学 | Method for producing liquid concentrated fertilizer from livestock and poultry manure |
| CN112795486B (en) * | 2020-12-30 | 2023-09-19 | 兴源环境科技股份有限公司 | Method for synchronously producing ethanol by livestock and poultry manure microalgae cultivation |
| CN113698462A (en) * | 2021-08-13 | 2021-11-26 | 上海藻翰生物科技有限公司 | Method for producing phycoerythrin and porphyridium polysaccharide by coupling wastewater purification |
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