CN219752089U - Resource continuous treatment system for purifying biogas slurry based on energy chlorella - Google Patents

Resource continuous treatment system for purifying biogas slurry based on energy chlorella Download PDF

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CN219752089U
CN219752089U CN202320820362.XU CN202320820362U CN219752089U CN 219752089 U CN219752089 U CN 219752089U CN 202320820362 U CN202320820362 U CN 202320820362U CN 219752089 U CN219752089 U CN 219752089U
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chlorella
biogas slurry
energy
tank
treatment system
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尹志红
李江
万洪叶
张峰衔
覃林
张云涛
何大海
万胜明
陈浩男
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Guizhou University
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Guizhou University
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Abstract

The utility model discloses a recycling continuous treatment system for purifying biogas slurry based on energy chlorella, which consists of a sewage pretreatment unit, a biogas slurry pretreatment unit, a chlorella culture unit, a chlorella flotation harvesting unit, a filtrate recycling unit and a chlorella biomass dehydration drying unit which are sequentially connected together through pipelines. The utility model combines the traditional sewage treatment with the culture of the chlorella, can obtain a high-added-value biomass product while treating the biogas slurry, and can be used for preparing nutrition additives, pharmacy and raw materials for producing biodiesel through dehydration, drying and transesterification of the collected chlorella, thereby realizing low-cost treatment of the biogas slurry and generating economic and social benefits.

Description

Resource continuous treatment system for purifying biogas slurry based on energy chlorella
Technical Field
The utility model belongs to the technical field of biogas slurry recycling, and particularly relates to a recycling continuous treatment system for purifying biogas slurry based on energy chlorella.
Background
The biogas slurry is used as a main product of anaerobic digestion, has the characteristics of large yield, complex components, difficult storage, high chromaticity, high organic matters, high nitrogen and phosphorus, other pollutants and the like, belongs to high-concentration organic wastewater, and can not be directly discharged without proper treatment. In addition, according to the organic fertilizer regulation issued by the agricultural rural department 2021, a large amount of toxic and harmful substances are contained in the sludge, and the sludge cannot be used as a raw material of the organic fertilizer, so that anaerobic digestion biogas slurry cannot be used as a liquid organic fertilizer. Traditional treatment technologies of biogas slurry comprise membrane separation, flocculation, advanced oxidation, an activated sludge method and the like, and the methods have the advantages of low efficiency, high price, easy blockage, high energy consumption, low nitrogen and phosphorus removal rate, easy secondary pollution and release of a large amount of greenhouse gases.
Microalgae are widely distributed on the earth, including land, river, lake and reservoir, ocean and various water environments, and can utilize sunlight and CO 2 And organic matters, nitrogen, phosphorus and microelements are used for realizing growth and reproduction. Microalgae are regarded as one of the most potential sources of biodiesel, and the microalgae cultured by using biogas slurry not only can recover carbon, nitrogen and phosphorus with low cost and high efficiency, but also can produce biomass with high added value, and can be used as raw materials of biodiesel, feed, fertilizer and cosmetics.
Therefore, the biogas slurry after anaerobic fermentation is treated by using the chlorella, the purification of the biogas slurry can be realized by the metabolism of the chlorella with low cost, and the dehydrated and dried chlorella can also be used as raw materials of biodiesel, feed, fertilizer and cosmetics by processing, thereby having economic and social benefits.
Disclosure of Invention
The utility model aims to provide a recycling continuous treatment system for purifying biogas slurry based on energy chlorella, which effectively solves the pollution problem of the biogas slurry by combining a traditional sewage treatment system with a recycling low-cost culture process of chlorella, and does not cause secondary pollution.
In order to achieve the above effects, the utility model adopts the following specific technical scheme: a recycling continuous treatment system for purifying biogas slurry based on energy chlorella is composed of a sewage pretreatment unit, a biogas slurry pretreatment unit, a chlorella culture unit, a chlorella flotation harvesting unit, a filtrate recycling unit and a chlorella biomass dehydration drying unit which are sequentially connected together through pipelines.
Further, the sewage pretreatment unit comprises a grid, a regulating tank, an anaerobic reactor and an MBR membrane bioreactor which are sequentially connected together through pipelines.
Further, the biogas slurry pretreatment unit comprises a flocculation sedimentation tank, a biogas slurry decoloring tank and a pH regulating tank which are sequentially connected together through pipelines.
Furthermore, the flocculation sedimentation tank and the pH adjusting tank are provided with a pH intelligent measuring instrument.
Further, the chlorella culture unit comprises a runway pool, wherein two feed inlets are arranged on the runway pool and are respectively used for allowing chlorella culture solution to enter and receiving biogas slurry discharged from a biogas slurry decoloring tank.
Further, the chlorella flotation harvesting unit comprises a mechanical stirring type flotation machine, the mechanical stirring type flotation machine is connected with a discharge port of the runway pool, two discharge ports are arranged on the mechanical stirring type flotation machine, one discharge port is connected with the filtrate pool, and the other discharge port is connected with the chlorella biomass dehydration drying unit.
Further, the filtrate recycling unit comprises a filtrate tank, two discharge ports are arranged on the filtrate tank, one discharge port is connected with the runway tank, and the other discharge port is connected with the urban green plant irrigation system;
further, the chlorella biomass dehydration drying unit comprises a plate-and-frame filter press and a low-temperature drying machine which are sequentially connected together through pipelines, and three discharge ports are formed in the low-temperature drying machine.
Due to the adoption of the technical scheme, the utility model has the beneficial effects that:
1. the utility model utilizes the biogas slurry to cultivate the chlorella, solves the problem of biogas slurry pollution, solves the problem of partial energy supply to a certain extent, and provides powerful support for the sustainable development of economy;
2. the utility model combines the traditional sewage treatment with the culture of the chlorella, can obtain a high added value biomass product while treating the biogas slurry, and the collected chlorella can be used for preparing nutrition additives, pharmacy and raw materials for producing biodiesel through dehydration, drying and transesterification, thereby realizing low-cost treatment of the biogas slurry and generating economic and social benefits;
3. the pretreated biogas slurry is used as a nutrient source of the chlorella, so that the efficiency of utilizing the biogas slurry by the chlorella is improved, the growth rate of the chlorella is improved, and the treatment time of the biogas slurry is reduced;
4. the utility model has the advantages of low construction cost, low running cost and the like, and is an economical and green development treatment technology.
5. The utility model uses the biogas slurry decoloring tank, thereby avoiding the influence of excessive deep color of the biogas slurry on photosynthesis of chlorella.
Drawings
FIG. 1 is a block diagram of a connection structure of the present utility model;
FIG. 2 is a graph showing the change in concentration of contaminants in biogas slurry in the examples.
The figure shows: 1-grille, 2-regulating tank, 3-anaerobic reactor, 4-MBR membrane bioreactor, 5-flocculation sedimentation tank, 6-biogas slurry decoloring tank, 7-pH regulating tank, 8-runway tank, 9-mechanical stirring type flotation machine, 10-filtrate tank, 11-plate-and-frame filter press and 12-low temperature desiccator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail with reference to the accompanying drawings and examples.
Examples
Referring to fig. 1, the recycling continuous treatment system based on energy chlorella purifying biogas slurry in the embodiment comprises a sewage pretreatment unit, a biogas slurry pretreatment unit, a chlorella culture unit, a chlorella flotation harvesting unit, a filtrate recycling unit and a chlorella biomass dewatering and drying unit which are sequentially connected together through pipelines.
The sewage pretreatment unit comprises a grid 1, a regulating tank 2, an anaerobic reactor 3 and an MBR membrane bioreactor 4 which are sequentially connected together through pipelines.
The biogas slurry pretreatment unit comprises a flocculation sedimentation tank 5, a biogas slurry decoloring tank 6 and a pH regulating tank 7 which are sequentially connected together through pipelines. And the flocculation sedimentation tank 5 and the pH adjusting tank 7 are respectively provided with a pH intelligent measuring instrument.
The chlorella culture unit comprises a runway pool 8, and two feed inlets are arranged on the runway pool 8 and are respectively used for allowing chlorella culture solution to enter and receiving biogas slurry discharged by the biogas slurry decoloring tank 6. The chlorella is metabolized and propagated in the runway pool 8 under the action of natural light, so that biogas slurry is purified.
The chlorella flotation harvesting unit comprises a mechanical stirring type flotation machine 9, the mechanical stirring type flotation machine 9 is connected with a discharge port of the runway pool 8, two discharge ports are arranged on the mechanical stirring type flotation machine 9, one discharge port is connected with the filtrate pool 10, and the other discharge port is connected with the chlorella biomass dehydration drying unit. And separating the chlorella from the purified biogas slurry by using a mechanical floatation stirring technology.
The filtrate recycling unit comprises a filtrate tank 10, wherein two discharge ports are arranged on the filtrate tank 10, one discharge port is connected with the runway tank 8, and the other discharge port is connected with the urban green plant irrigation system 13.
The chlorella biomass dehydration drying unit comprises a plate-and-frame filter press 11 and a low-temperature drier 12 which are sequentially connected together through pipelines, and three discharge ports are arranged on the low-temperature drier 12. The dehydrated and dried chlorella biomass is recycled, and the treated chlorella biomass can be conveyed to different processing factories through three discharge ports, for example, the treated chlorella biomass is conveyed to a health-care product production factory for being used as a nutritional additive of food, and can be conveyed to a pharmaceutical factory and a biodiesel manufacturing factory at the same time.
The working process of the utility model comprises the following steps:
step one, sewage is discharged into the grid 1, the grid 1 intercepts floaters and larger suspended solids in the sewage, and prevents a water pump unit, an aerator, a pipeline valve, a treatment structure water distribution facility and a water inlet and outlet from being blocked and wound, so that scum generated in subsequent treatment is reduced, and the normal operation of the sewage treatment facility is ensured.
And step two, the treated sewage is discharged into the regulating tank 2 through a pipeline, and the water quantity is regulated and the water quality is balanced. Wherein the specific functions are as follows: provides buffering capacity for organic matter load and prevents abrupt change of biological treatment system. The pH is controlled to reduce the amount of neutralizing chemicals. The flow fluctuation of the physicochemical treatment system is reduced, so that the chemical adding rate is suitable for the quota of the feeding equipment. When the factory is stopped, the wastewater can still be continuously input into the biological treatment system. And controlling the discharge of wastewater to the municipal system so as to relieve the change of the wastewater load distribution and prevent the high-concentration toxic substances from entering the biological treatment system.
Step three, after pretreatment, the wastewater flows into an anaerobic reactor 3, meanwhile, activated sludge flowing back from a secondary sedimentation tank flows into the anaerobic reactor, phosphorus is released by phosphorus accumulating bacteria under anaerobic environment conditions, meanwhile, COD which is easy to degrade is converted into PHB by VFA, and part of nitrogen-containing organic matters are aminated. Sewage flows into the anaerobic reactor and then enters the anoxic reactor, and the primary function of the reactor is to perform denitrification. The nitrate nitrogen is transferred from the aerobic reactor through the internal circulation of the mixed solution, the internal reflux quantity is generally 2-4 times of the original sewage flow, and partial organic matters are degraded and removed by using nitrate as a single-element receptor under the action of denitrifying bacteria. And (3) the mixed solution enters an aerobic reaction zone from the anoxic reaction zone, if the denitrification reaction is basically carried out completely, the COD concentration of the mixed solution is basically close to the emission standard, the nitrification of ammonia nitrogen and the absorption of phosphorus are mainly carried out in the aerobic reaction zone except for further degrading organic matters, the nitrate nitrogen in the mixed solution flows back to the anoxic reaction zone, and the excessive absorbed phosphorus in the sludge is discharged through the residual sludge.
And step four, the treated sewage enters an MBR membrane bioreactor 4 through a lifting pump, an aerator is started to oxygenate through a PLC controller, the effluent of the MBR membrane bioreactor 4 enters a membrane treatment unit through a circulating pump, the concentrated water returns to an adjusting tank, and the water separated by the membrane enters a reclaimed water reservoir after being subjected to chlorination disinfection through a rapid mixing method. The back flushing pump uses the treated water in the cleaning tank to back flush the membrane treatment unit, and the back flushing sewage returns to the regulating tank. The on-off of the lift pump is controlled by the water level in the MBR membrane bioreactor 4. The filtration operation and the back flushing operation of the membrane treatment unit can be controlled automatically or manually. When the membrane treatment unit needs chemical cleaning operation, the water inlet valve and the sewage circulating valve are closed, the medicine washing valve and the medicine circulating valve are opened, and the medicine circulating pump is started to perform chemical cleaning operation.
Step five, the biogas slurry is obtained after treatment by the MBR membrane bioreactor 4, the biogas slurry flows into the flocculation sedimentation tank 5, and after the flocculant is added, the flocculating constituent grows to a certain volume and is separated from the water phase sediment under the action of gravity, so that the suspended matters, sediment, organic matters and other pollutants in the turbid flow are reduced to a certain concentration level, the water quality is improved, and the water treatment effect is achieved.
And step six, the treated biogas slurry flows into a biogas slurry decoloring tank 6 through a pipeline, and pigments or other impurities in the biogas slurry are adsorbed through activated carbon or activated clay and the like, so that the purposes of decoloring, deodorizing, degreasing, impurity removal, purifying, refining and the like are achieved.
And step seven, after the decoloring tank 6 is treated, the wastewater flows into a PH regulating tank 7, the PH is regulated to a proper growth PH range of the needed cultured microorganisms, and the growth of other microorganisms is inhibited. After PH is regulated, the chlorella flows into the runway pool 8 for culturing chlorella, water in the runway pool 8 flows when the runway pool 8 works, and the chlorella cultured in the runway pool 8 performs photosynthesis through illumination, so that the growth of the chlorella is accelerated, and the purpose of culturing the chlorella is achieved.
Step eight, microalgae harvesting is performed by adopting a mechanical stirring type flotation machine 9, and the chlorella and the purified biogas slurry are separated by utilizing a mechanical flotation stirring technology, so that the microalgae harvesting efficiency is higher, the method is a very promising low-cost large-scale harvesting method, and the surfactant (N, N' -bis (hexadecyldimethyl) -1, 4-butane diammonium dibromide, BCBD for short) has better flotation harvesting performance. The mechanical stirring type flotation machine 9 is connected with a discharge port of the runway pool 8, two discharge ports are arranged on the mechanical stirring type flotation machine 9, one discharge port is connected with the filtrate pool 10, and the other discharge port is connected with the chlorella biomass dehydration drying unit. As shown in FIG. 2, the removal rate of COD, TN and NH, which are main pollutants in biogas slurry, reaches 65.48% by chlorella culture 4 + The removal rates of-N reached 58.36% and 83.27%, respectively, TP and PO 4 3- The removal rate of P reaches 70.48% and 84.17%, respectively.
Step nine, be provided with two discharge gates on the filtrate pond 10, one of them discharge gate is connected with runway pond 8, carries out the part of breeding the algae again, and another one discharge gate is connected with urban green irrigation system 13 of planting, and urban green intelligent irrigation system (13) of planting is connected to another delivery port, irrigates the green planting in city, this water pressure that has also reduced the city.
And step ten, the plate-and-frame filter press 11 in the chlorella biomass dehydration drying unit adopts a plate-and-frame filter pressing dehydration technology, and the working principle is that the solid-liquid separation is carried out by utilizing the action of pressure difference and filter cloth. In the dehydrator, liquid enters a filtering area through a filtering medium, and after the liquid is subjected to pressure, solid particles reaching a certain concentration gradually accumulate on a filter cloth to form a layer of solid filter cake. The low temperature dryer 12 adopts a low temperature drying process, which is a special process for evaporating water from the material at a lower temperature, in this way, thermal damage to the material due to high temperature can be avoided, thereby maintaining the original color, taste and nutrition of the material. The temperature of low temperature drying is usually between 40 and 80 ℃, and the temperature does not change the chemical property of the material, so that the quality of the material can be maintained. The low temperature drying process usually adopts an air flow or vacuum drying mode to accelerate the evaporation rate of the moisture. The chlorella biomass is dehydrated and dried and then sent to a processing plant for use, wherein the low-temperature dryer 12 is provided with three discharge ports, the first discharge port is used for transporting the microalgae to a health product production factory for serving as a nutritional additive of food, and the chlorella biomass has high protein, high amino acid and the like, and can be manufactured into health products for reducing blood pressure and blood fat, enhancing immunity and resisting oxidation; the second discharging port is used for conveying the chlorella to a pharmaceutical factory and has the effects of detoxification, radiation resistance, tumor resistance and the like; and the third discharge hole conveys the chlorella to a biodiesel manufacturing plant, and the microalgae can be prepared into biodiesel to relieve the national energy problem. The treatment and application of microalgae are solved in three modes, and the microalgae are treated in three treatment modes, so that the cost is further reduced.
Through the embodiment, the biogas slurry can be efficiently treated by the chlorella, so that the recycling of waste water is realized, the benefit of the microalgae can be maximized, the environmental protection is greatly realized, and the national energy problem is relieved. The utility model reduces the cost of biogas slurry treatment to a very low stage and lightens the economic pressure. The treatment process of the utility model is not complex, has fewer steps, higher stability, less construction time and high popularization degree.

Claims (8)

1. A recycling continuous treatment system for purifying biogas slurry based on energy chlorella is characterized in that: the system consists of a sewage pretreatment unit, a biogas slurry pretreatment unit, a chlorella culture unit, a chlorella flotation harvesting unit, a filtrate recycling unit and a chlorella biomass dehydration drying unit which are sequentially connected together through pipelines.
2. The energy-based chlorella purification biogas slurry-based recycling continuous treatment system according to claim 1, wherein the system is characterized in that: the sewage pretreatment unit comprises a grid (1), an adjusting tank (2), an anaerobic reactor (3) and an MBR membrane bioreactor (4) which are sequentially connected together through pipelines.
3. The energy-based chlorella purification biogas slurry-based recycling continuous treatment system according to claim 1, wherein the system is characterized in that: the biogas slurry pretreatment unit comprises a flocculation sedimentation tank (5), a biogas slurry decoloring tank (6) and a pH regulating tank (7) which are sequentially connected together through pipelines.
4. The energy-based chlorella purification biogas slurry-based recycling continuous treatment system according to claim 3, wherein the system comprises: and the flocculation sedimentation tank (5) and the pH adjusting tank (7) are respectively provided with a pH intelligent measuring instrument.
5. The energy-based chlorella purification biogas slurry-based recycling continuous treatment system according to claim 1, wherein the system is characterized in that: the chlorella culture unit comprises a runway pool (8), wherein two feed inlets are formed in the runway pool (8) and are respectively used for allowing chlorella culture solution to enter and receiving biogas slurry discharged from a biogas slurry decoloring tank (6).
6. The energy-based chlorella purification biogas slurry-based recycling continuous treatment system according to claim 1, wherein the system is characterized in that: the chlorella flotation harvesting unit comprises a mechanical stirring type flotation machine (9), wherein the mechanical stirring type flotation machine (9) is connected with a discharge hole of the runway pool (8), two discharge holes are formed in the mechanical stirring type flotation machine (9), one discharge hole is connected with the liquid filtering pool (10), and the other discharge hole is connected with the chlorella biomass dewatering and drying unit.
7. The energy-based chlorella purification biogas slurry-based recycling continuous treatment system according to claim 1, wherein the system is characterized in that: the filtrate recycling unit comprises a filtrate tank (10), two discharge ports are arranged on the filtrate tank (10), one discharge port is connected with the runway tank (8), and the other discharge port is connected with the urban green plant irrigation system (13).
8. The energy-based chlorella purification biogas slurry-based recycling continuous treatment system according to claim 1, wherein the system is characterized in that: the chlorella biomass dehydration drying unit comprises a plate-and-frame filter press (11) and a low-temperature drier (12) which are sequentially connected together through pipelines, and three discharge ports are formed in the low-temperature drier (12).
CN202320820362.XU 2023-04-13 2023-04-13 Resource continuous treatment system for purifying biogas slurry based on energy chlorella Active CN219752089U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117535123A (en) * 2023-10-31 2024-02-09 浙江中科沃尔德生物科技有限公司 System for preparing natural gas by high-efficiency biomass medium-high temperature anaerobic fermentation and process for preparing natural gas by using same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117535123A (en) * 2023-10-31 2024-02-09 浙江中科沃尔德生物科技有限公司 System for preparing natural gas by high-efficiency biomass medium-high temperature anaerobic fermentation and process for preparing natural gas by using same

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