Production device for culturing microalgae from kitchen biogas slurry

Abstract

The utility model discloses a production device for cultivating microalgae by kitchen biogas slurry, which belongs to the technical field of kitchen biogas slurry purification treatment and comprises an aeration system, a pretreatment system, a membrane dialysis system, a photo-biological reaction system and a control cabinet, the aeration system comprises an aeration fan and an aerator connected through an aeration air pipe; the pretreatment system comprises a pretreatment aeration tank, a pretreatment sludge settling tank and a pretreatment water producing tank which are sequentially communicated, and aerators are correspondingly arranged in the pretreatment aeration tank; the membrane dialysis system comprises a dialysis membrane reactor, a plurality of groups of dialysis membrane assemblies are arranged in the dialysis membrane reactor, and the dialysis membrane assemblies are circularly communicated with the pretreatment water producing pool; the photo-biological reaction system comprises a photo-bioreactor, and the inlet end and the outlet end of the photo-bioreactor are respectively communicated with the shell pass of the dialysis membrane reactor; and the control cabinet is connected with each execution device and issues a control instruction. The device has the advantages of high automation degree and high carbon sequestration efficiency, and can be used for culturing microalgae at low cost by utilizing the kitchen biogas slurry.

Description

TECHNICAL FIELD

[0001] The utility model relates to kitchen biogas liquid purification treatment technical field especially relates to a kind of production device for kitchen biogas liquid cultivation microalgae. BACKGROUND

[0002] In the current CCUS technology system, biological carbon fixation and utilization have high sustainable development potential. In the biological carbon fixation method, microalgae, as a kind of microalgae that can fix CO2 through photosynthesis widely existing in nature, have always been high in production price, which is a restrictive factor for the commercialization and popularization of this technology. Currently, the focus is on utilizing nutrients in waste or wastewater to realize resource utilization and reduce microalgae breeding costs.

[0003] In the kitchen waste purification treatment method, anaerobic treatment is a common treatment method. The kitchen biogas liquid produced by anaerobic reaction contains the nutrients required for microalgae cultivation, but how to convert the kitchen biogas liquid into nutrient solution and sustainably use it for microalgae production is an industry difficulty. SUMMARY

[0004] The technical problem to be solved is that the utility model provides a production device for kitchen biogas liquid cultivation of microalgae, which has high automation, can utilize kitchen biogas liquid, and has high carbon fixation efficiency. The device can cultivate microalgae at low cost using kitchen biogas liquid, and realize the popularization of microalgae biological carbon fixation technology.

[0005] Technical solution: The utility model discloses a production device for kitchen biogas liquid cultivation of microalgae, which comprises:

[0006] An aeration system, which comprises an aeration fan and an aeration air pipe connected with the aeration fan, and an aerator arranged at the end of the aeration air pipe;

[0007] A pretreatment system, which comprises a pretreatment aeration tank, a pretreatment sludge settling tank, and a pretreatment water production tank arranged in sequence; the aerator is arranged in the pretreatment aeration tank, and the pretreatment aeration tank is connected with a biogas liquid inlet pipe; the bottom of the pretreatment sludge settling tank is provided with a sludge outlet pipe, and the bottom of the pretreatment water production tank is provided with a water outlet pipe;

[0008] A membrane dialysis system, which comprises a dialysis membrane reactor, and a plurality of dialysis membrane assemblies arranged in the dialysis membrane reactor in communication; the dialysis membrane assemblies are connected with the water outlet pipe through a dialysis inlet pipe and a dialysis inlet pump, and the dialysis membrane assemblies are connected with the pretreatment water production tank through a dialysis circulation pipe;

[0009] A photobiological reaction system comprises a photobioreactor, which is connected with the shell side of a dialysis membrane reactor through a photobioreactor water inlet pipe and a photobioreactor circulation pipe; the photobioreactor is provided with an algal liquid discharge pipe;

[0010] A control cabinet is connected with each actuator through a connecting cable and issues control instructions.

[0011] Preferably, the sludge discharge pipe of the sludge tank is connected with a pretreatment circulation pump, a pretreatment sludge discharge pipe and an aeration tank backflow pipe connected with the pretreatment aeration tank; the pretreatment sludge discharge pipe is connected with a pretreatment sludge discharge valve.

[0012] Preferably, the bottom of the pretreatment aeration tank is provided with a sludge tank water inlet pipe connected with the pretreatment sludge tank, and the pretreatment sludge tank is provided with a plurality of baffle plates; the pretreatment sludge after water separation flows into the pretreatment water production tank from the top of the pretreatment sludge tank.

[0013] Preferably, the dialysis circulation pipe is connected with a circulation control valve; the dialysis circulation pipe at the front end of the circulation control valve is connected with a dialysis effluent pipe, and the dialysis effluent pipe is connected with a dialysis effluent valve.

[0014] Preferably, the photobioreactor water inlet pipe is connected with a photobioreactor circulation pump.

[0015] Preferably, the algal liquid discharge pipe is connected with an algal liquid discharge valve.

[0016] Preferably, the aeration fan is a Roots blower with an air volume of 20 m 3 / min and an air pressure of 5 mH2O; the aerator is a microporous plate aerator.

[0017] Preferably, the flow of the pretreatment circulation pump is 10 m 3 / h, and the lift is 15 m.

[0018] Preferably, the flow of the dialysis water inlet pump is 5 m 3 / h, and the lift is 8 m.

[0019] Preferably, the flow of the photobioreactor circulation pump is 5 m 3 / h, and the lift is 8 m.

[0020] Compared with the prior art, the photobiological reaction system has the following beneficial effects:

[0021] The production device aims at low-cost microalgae breeding, and through oxygen aeration pretreatment, mud setting, dialysis membrane material exchange and other modes, nutrient salts such as N / P in kitchen biogas liquid are transferred to microalgae culture solution through dialysis of dialysis membrane, so that the biogas liquid treatment system and the microalgae breeding system are isolated, the N / P nutrient solution in the biogas liquid is returned to other end treatment process for standard discharge after being used, the microalgae culture process does not contact the biogas liquid, and there is no excess macromolecular organic matter in the microalgae culture solution, so that the quality of microalgae products is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a production device structure schematic view of the utility model.

[0023] The drawing mark: 100, production device;

[0024] 1, aeration system;11, aeration fan;12, aeration air pipe;13, aerator;

[0025] 2, pretreatment system;21, pretreatment aeration tank;22, biogas liquid inlet pipe;23, aeration tank backflow pipe;24, pretreatment sludge discharge valve;25, pretreatment sludge discharge pipe;26, pretreatment sludge setting tank;27, mudguard;28, sludge setting tank water inlet pipe;29, sludge setting tank sludge outlet pipe;210, pretreatment circulating pump;211, pretreatment water production tank;212, water production tank drain pipe;

[0026] 3, membrane dialysis system;31, dialysis membrane reactor;32, dialysis membrane assembly;33, dialysis water inlet pump;34, dialysis circulating pipe;35, dialysis water inlet pipe;36, circulating control valve;37, dialysis water outlet valve;38, dialysis water outlet pipe;

[0027] 4, light biological reaction system;41, light biological reactor;42, light reactor water inlet pipe;43, light reactor circulating pump;44, light reactor circulating pipe;45, algae liquid discharge pipe;46, algae liquid discharge valve;

[0028] 5, control cabinet. DETAILED DESCRIPTION

[0029] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, specific implementation will be described below in combination with the attached Figure 1 The technical scheme of the embodiments of the utility model is clearly and completely described. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art belong to the scope of protection of the utility model.

[0030] As Figure 1The utility model discloses a production device for kitchen biogas liquid cultivation microalgae, and the production device 100 includes aeration system 1, pretreatment system 2, membrane dialysis system 3, light biological reaction system 4 and control cabinet 5.

[0031] Aeration system 1 includes aeration fan 11 and aeration air pipe 12 in communication with aeration fan 11, and aeration air pipe 12 is provided with aerator 13 at the end, and aerator 13 is correspondingly arranged in pretreatment aeration tank 21, and aeration fan 11 is exposed to air in pretreatment aeration tank 21 through aeration air pipe 12, and aerobic biochemical reaction occurs in pretreatment aeration tank 21 after kitchen biogas liquid is poured in. 3 / min, and the wind pressure is 5mH2O; the aeration form is microporous plate aeration, and the material of aerator 13 is plastic.

[0032] Pretreatment system 2 includes pretreatment aeration tank 21, pretreatment sludge tank 26 and pretreatment water production tank 211 arranged in sequence in communication, and aerator 13 is correspondingly arranged in pretreatment aeration tank 21, and pretreatment aeration tank 21 is connected with biogas liquid inlet pipe 22, and kitchen biogas liquid is pumped into pretreatment aeration tank 21 through biogas liquid inlet pipe 22 and external water supply. 3 / h, and the flow part is made of 304 stainless steel material, and the lift is 15m. The bottom of pretreatment water production tank 211 is provided with water production tank drain pipe 212. When working, kitchen biogas liquid is reacted in pretreatment aeration tank 21, and then enters pretreatment sludge tank 26 through sludge tank inlet pipe 28, and mud-water separation is carried out, and sludge enters pretreatment circulating pump 210 through sludge tank outlet pipe 29, and is pumped to pretreatment aeration tank 21 through aeration tank backflow pipe 23 for circulating aeration treatment, and part of sludge is discharged to the system outside through pretreatment sludge discharge pipe 25, and the sludge discharge process is controlled through pretreatment sludge discharge valve 24.

[0033] The pretreatment aeration tank 21, the pretreatment sludge tank 26 and the pretreatment water tank 211 are all made of carbon steel corrosion-resistant structure tank bodies, and the baffle in the pretreatment sludge tank 26 is made of PP material. The pretreatment aeration tank 21 is designed to have a hydraulic retention time of 1d, the pretreatment sludge tank 26 is designed to have a hydraulic retention time of 1d, and the pretreatment water tank 211 is designed to have a retention time of 2d, and the tank body system is operated in an intermittent water inlet mode. The water quality of the pretreatment water tank 211 has a COD concentration less than 500mg / L, an ammonia nitrogen concentration of about 20mg / L, and a NO3 - concentration of about 1300mg / L.

[0034] The membrane dialysis system 3 comprises a dialysis membrane reactor 31, and a plurality of dialysis membrane assemblies 32 are arranged in the dialysis membrane reactor 31 in communication. The plurality of dialysis membrane assemblies 32 are arranged in parallel in the dialysis membrane reactor 31 and share one liquid inlet end and one liquid outlet end. The liquid inlet end of the dialysis membrane assembly 32 is connected to the water tank drainage pipe 212 through a dialysis water inlet pipe 35 and a dialysis water inlet pump 33, the liquid outlet end of the dialysis membrane assembly 32 is connected to the pretreatment water tank 211 through a dialysis circulation pipe 34, a circulation control valve 36 is connected to the dialysis circulation pipe 34, a dialysis water outlet pipe 38 is connected to the dialysis circulation pipe 34 at the front end of the circulation control valve 36, and the dialysis water outlet pipe 38 is connected to a dialysis water outlet valve 37. The flow rate of the dialysis water inlet pump 33 is 5m 3 / h, the head is 8m, and the flow part is made of 304 stainless steel. The main body shell of the dialysis membrane reactor 31 is made of transparent acrylic organic glass material, the dialysis membrane assembly 32 is vertically arranged in the dialysis membrane reactor 31, the membrane inside the dialysis membrane assembly 32 flows through the pretreated biogas slurry, the outer side of the dialysis membrane flows through the microalgae liquid of the cultivated microalgae, the dialysis membrane material is standard regenerated cellulose (RC) material, the molecular weight cut-off is greater than 500 daltons, the dark macromolecular organic molecules can be blocked from penetrating, and the concentration gradient difference of NO3 - / PO4 3- and plasma on both sides of the membrane realizes ion transport across the membrane.

[0035] When the membrane dialysis system 3 works, the biogas slurry in the pretreatment water tank 211 is pumped into the dialysis membrane reactor 31 through the dialysis water inlet pump 33 via the reactor water inlet pipe, the pretreated biogas slurry flows through the tube of the dialysis membrane assembly 32 in the dialysis membrane reactor 31, and is returned to the pretreatment water tank 211 for circulation membrane dialysis via the reactor circulation pipe. After the nutrient salts in the biogas slurry are fully exchanged and utilized in the membrane dialysis system 3, the remaining waste water can flow out of the membrane dialysis system 3 through the dialysis water outlet pipe 38, and the pretreated biogas slurry drainage and circulation processes are controlled through the dialysis water outlet valve 37 and the circulation control valve 36, respectively.

[0036] The photobiological reaction system 4 comprises a photobiological reactor 41 connected with the shell side of the dialysis membrane reactor 31 through a photoreactor water inlet pipe 42, the photoreactor water inlet pipe 42 being connected with a photoreactor circulating pump 43 and connected with the shell side of the dialysis membrane reactor 31 through a photoreactor circulating pipe 44. The photobiological reactor 41 is provided with an algal liquid discharge pipe 45 connected with an algal liquid discharge valve 46. The photobiological reactor 41 is a column photoreactor, the main body of which is made of high boron glass with a light transmittance of more than 95%; before the algal liquid enters, clean water is circulated in the interior, and the clean water exchanges substances with the marsh liquid in the interior of the dialysis membrane when passing through the dialysis membrane reactor 31, so that the concentration of nitrate nitrogen is gradually increased; when the concentration of NO3 - is increased to 300 mg / L, Chlorella sp. is inoculated, and with the growth of the microalgae, NO3 - and other nutrients in the column reactor are consumed and utilized, and NO3 - and other nutrients in the interior of the dialysis membrane continuously supplement the concentration of the nutrients of the photoreactor system through the dialysis membrane, so that the nutrients of the photoreactor system are kept in dynamic balance; when the concentrations of NO3 - on both sides of the dialysis membrane are less than 250 mg / L, part of the treated marsh liquid is discharged through the dialysis effluent pipe 38, and the marsh liquid pretreatment product water is supplemented through the front end pretreatment system 2, so that the concentration of the nutrients in the photoreactor is increased. The flow of the photoreactor circulating pump 43 is 5 m 3 / h, the lift is 8 m, and the overflow component is made of 304 stainless steel. The photobiological reaction system 4 is placed in an outdoor light irradiation place for cultivation, does not need an additional light source for light supplement, and has low energy consumption.

[0037] When the photobiological reaction system 4 works, the liquid level flowing through the shell side of the dialysis membrane reactor 31 is the microalgae cultivation algal liquid, the algal liquid is transported into the column photobiological reactor 41 through the photoreactor water inlet pipe 42 and the photoreactor circulating pump 43, the algal liquid enters from the lower part of the photobiological reactor 41 and returns to the dialysis membrane reactor 31 through the photoreactor circulating pipe 44 in the upper part, so that the algal liquid flow circulation is formed. After the cultivation of the algal liquid, the algal liquid is discharged through the algal liquid discharge pipe, and the discharge of the algal liquid and the water inlet of the photobiological reactor 41 are controlled through the algal liquid discharge valve.

[0038] The control cabinet 5 is connected with each actuator through a connecting cable and issues a control instruction, for example, is electrically connected with the aeration fan 11, the pretreatment circulating pump 210, the dialysis water inlet pump 33, the photoreactor circulating pump 43 and the like, and the start and stop of the production device are controlled through the control cabinet 5. The cabinet body of the control cabinet 5 is made of stainless steel, and the cabinet is integrated with a system power switch and a PLC control system, so that the whole production device can be automatically operated.

[0039] The system pipeline of the utility model can adopt the UPCV material plastic pipe, and the control valve can adopt the ball valve.

[0040] The chlorella powder produced by the production device of the embodiment of the utility model utilizes the chlorella powder produced by the kitchen biogas liquid resource test and meets the first grade product requirement of "DB32T564-2010 Chlorella Powder for Feed", as shown in Table 1.

[0041] .

[0042] The above is the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled persons in the art, without departing from the principles of the utility model, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the utility model.

Claims

1. A production device for cultivating microalgae using food waste biogas, characterized in that: The production device (100) comprises: An aeration system (1), the aeration system (1) comprising an aeration fan (11) and an aeration duct (12) connected to the aeration fan (11), an aerator (13) being provided at the end of the aeration duct (12); A pretreatment system (2), the pretreatment system (2) comprising a pretreatment aeration tank (21), a pretreatment sedimentation tank (26), and a pretreatment water production tank (211) which are sequentially connected; the aerator (13) is correspondingly arranged in the pretreatment aeration tank (21), and the pretreatment aeration tank (21) is connected to the biogas slurry inlet pipe (22); a sedimentation tank outlet pipe (29) is provided at the bottom of the pretreatment sedimentation tank (26), and a water production tank drain pipe (212) is provided at the bottom of the pretreatment water production tank (211); A membrane dialysis system (3), the membrane dialysis system (3) comprising a dialysis membrane reactor (31), a plurality of interconnected dialysis membrane assemblies (32) being provided inside the dialysis membrane reactor (31), the dialysis membrane assemblies (32) being connected to a water production pool drain pipe (212) via a dialysis water inlet pipe (35) and a dialysis water inlet pump (33), and the dialysis membrane assemblies (32) being connected to a pretreatment water production pool (211) via a dialysis circulation pipe (34); A photobioreactor system (4), the photobioreactor system (4) comprising a photobioreactor (41), the photobioreactor (41) being connected to the shell side of a dialysis membrane reactor (31) via a photoreactor water inlet pipe (42), and being connected to the shell side of the dialysis membrane reactor (31) via a photoreactor circulation pipe (44); the photobioreactor (41) being provided with an algae liquid discharge pipe (45); A control cabinet (5) is connected to each actuator via a connecting cable and issues control instructions.

2. The production device for cultivating microalgae with food waste biogas according to claim 1, characterized in that: The sludge discharge pipe (29) of the sedimentation tank is connected to the pretreatment sludge discharge pipe (25) and the aeration tank return pipe (23) connected to the pretreatment aeration tank (21) through the pretreatment circulation pump (210), and the pretreatment sludge discharge pipe (25) is connected to the pretreatment sludge discharge valve (24).

3. The production device for cultivating microalgae with food waste biogas according to claim 2, characterized in that: A sludge tank water inlet pipe (28) communicating with the pretreatment sludge tank (26) is provided at the bottom of the pretreatment aeration tank (21), and a plurality of mud guards (27) are provided in the pretreatment sludge tank (26). The pretreated biogas slurry after mud and water separation overflows from the top of the pretreatment sludge tank (26) into the pretreatment water production tank (211).

4. The production device for cultivating microalgae with food waste biogas according to claim 1, characterized in that: The dialysis circulation tube (34) is connected to the circulation control valve (36); the dialysis circulation tube (34) at the front end of the circulation control valve (36) is connected to the dialysis water outlet tube (38), and the dialysis water outlet tube (38) is connected to the dialysis water outlet valve (37).

5. The production device for cultivating microalgae with food waste biogas according to claim 1, characterized in that: The photoreactor water inlet pipe (42) is connected to the photoreactor circulation pump (43).

6. The production device for cultivating microalgae with food waste biogas according to claim 1, characterized in that: The algae liquid discharge pipe (45) is connected to the algae liquid discharge valve (46).

7. The production device for cultivating microalgae with food waste biogas according to claim 1, characterized in that: The aeration blower (11) is a Roots blower with an air volume of 20m 3 / min, wind pressure 5mH2O; the aerator (13) is a microporous plate aerator.

8. The production device for cultivating microalgae with food waste biogas according to claim 2, characterized in that: The flow rate of the pretreatment circulation pump (210) is 10m 3 / h, lift 15m.

9. The production device for cultivating microalgae with food waste biogas according to claim 1, characterized in that: The flow rate of the dialysis water inlet pump (33) is 5m 3 / h, lift 8m.

10. The production device for cultivating microalgae with food waste biogas according to claim 5, characterized in that: The flow rate of the photoreactor circulation pump (43) is 5m 3 / h, lift 8m.

Images