CN215756903U

CN215756903U - Algae, microorganism and domestic sewage treatment system

Info

Publication number: CN215756903U
Application number: CN202121353975.4U
Authority: CN
Inventors: 杨贞武; 白春; 沈远持; 钟晨
Original assignee: China Gezhouba Group Water Operation Co ltd
Current assignee: Gezhouba Group Ecological Environmental Protection Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-02-08
Anticipated expiration: 2031-06-17

Abstract

Disclosure of the utility modelAn algae, microorganism and domestic sewage treatment system is connected with a municipal domestic sewage pipe and comprises an anaerobic tank; the anaerobic tank is sequentially connected with a facultative tank, an aerobic tank, a precipitation filter and a microalgae reactor; the outlet of the microalgae reactor is connected with an aerobic microbial reactor, and the aerobic microbial reactor is respectively connected with a first algae mud separator and a second algae mud separator; the first algae mud separator and the second algae mud separator are respectively connected with the algae-laden liquid separator and the mud-gas reactor, the mud outlet of the mud-gas reactor is connected with the inlet of the aerobic pool, the exhaust port of the aerobic pool is connected with the air inlet of the mud-gas reactor, and the gas outlet of the mud-gas reactor is connected with the microalgae reactor. The utility model realizes the dissolution of O₂Removal of CO and CO₂Fixing and strengthening step by step; the metabolites of the microalgae also have a certain inhibiting effect on the system, and the microalgae synthetic metabolites are consumed by the microalgae synergistic effect with the microorganisms to promote the microalgae Karlvin cycle production.

Description

Algae, microorganism and domestic sewage treatment system

Technical Field

The utility model relates to the technical field of energy conservation and emission reduction of sewage treatment and carbon dioxide capture, in particular to an algae, microorganism and domestic sewage treatment system.

Background

In the field of sewage treatment, the ongoing innovation and movement with low energy consumption and low emission can start a new revolution of technology updating in the sewage treatment and even environmental management industries.

The following outstanding problems exist in the field of sewage treatment at present:

1) the existence of a large amount of CO in sewage treatment₂Directly exhausting to atmosphere without treatment; preliminary estimate of annual CO-emissions from national sewage treatment plants₂About 2 million tons;

2) the sewage treatment process of part of pure microalgae has the problems of low culture concentration, low light source utilization efficiency and low treatment efficiency; in the high-concentration algae liquid cultured independently, because O is dissolved₂The concentration is high, the inhibition effect is generated, and the continuous operation is not facilitated; directly put into sewage to run in the same tank with sludge, the utilization rate of a light source is low, and microorganisms dissolve O₂Difficult regulation, overall inefficiency:

first, microalgae are directly usedWhen the microalgae is put into an activated sludge sewage treatment system, the concentration of the microalgae is not high and is not easy to control, and because sludge has an astigmatism effect, the utilization rate of a light source is not high and is less than 10 percent of an effective light source for independently culturing algae; and system O₂Concentration is not easy to control, too high O₂Is not favorable for the growth of microalgae. System dissolved O₂Reasons for this difficulty in control: firstly, because the aerobic system is charged with O₂The growth of microalgae is inhibited because the facultative system requires a low potential (generally about 0mV) of the solution to control the denitrification process, and then releases dissolved O with the algae₂Improving the system potential conflict; with CO₂Low concentration, no proper pH environment, HCO₃ ^-Not high, CO₂The fixation rate is not high and is not easy to control;

secondly, microalgae is directly put into an activated sludge sewage treatment system, so that the sludge amount is not easy to control and the reduction operation is not easy, the landfill and the discarding are difficult, the final harmless treatment cost is high, and the treatment cost is increased by 30%;

thirdly, culturing the microalgae independently, adding an external carbon source to supplement NaHCO3, and then adding the carbon source into the sewage to carry out photosynthesis to absorb nitrogen and phosphorus compounds in the water; first, continuous NaHCO replenishment is required₃Secondly, the continuous blowing of air to remove O₂Extra power energy is consumed, and the algae by-products are obviously increased, so that the post-treatment cost is increased by 30%;

finally, there is no sewage treatment system for microalgae co-treatment, because of the improvement of sewage discharge standard, especially the treatment of total nitrogen, the consumption of auxiliary carbon source is directly increased; the unit consumption of carbon sources of individual sewage treatment water plants exceeds 0.5 yuan/ton, the increase of the carbon sources causes the sludge treatment load to be greatly increased, and the sludge yield is increased by more than 50% after carbon sources are added into part of the water plants.

Therefore, with the more outstanding contradiction between the improvement of water quality indexes and the increase of operating cost, under the requirements of energy conservation and emission reduction and carbon neutralization, a sewage treatment process which is more energy-saving and has zero discharge in a system must be developed.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides algae, microorganisms and lifeThe sewage treatment system can combine microalgae carbon sequestration and sewage treatment, and carries out O removal through sludge external circulation and microalgae liquid circulation coupling treatment, microalgae and sewage treatment waste gas circulation absorption treatment, and sewage aerobic pool waste gas and aerobic sludge external circulation graded absorption₂Releasing CO₂Performing cooperative treatment; in the whole sewage treatment process, CO is reduced₂Discharging and reducing the addition of external carbon sources; improving the culture efficiency of microalgae and improving the denitrification and dephosphorization effects.

In order to achieve the purpose, the utility model designs an algae, microorganism and domestic sewage treatment system, which is connected with a municipal domestic sewage pipe and comprises an anaerobic tank; the anaerobic tank is sequentially connected with a facultative tank, an aerobic tank, a precipitation filter and a microalgae reactor; the outlet of the microalgae reactor is connected with an aerobic microbial reactor, and the aerobic microbial reactor is respectively connected with a first algae mud separator and a second algae mud separator;

the first algae mud separator and the second algae mud separator are respectively connected with an algae-laden liquid separator and a mud-gas reactor (absorbing and dissolving O)₂Releasing CO₂Increasing the CO content of the effluent gas of the slurry gas reactor₂The concentration, the sludge of the sludge gas reactor comes from the separation of algae sludge; simultaneously, sludge discharged by the sludge-gas reactor flows back to the aerobic tank; simultaneously, the waste gas of the aerobic tank enters the mud-gas reactor and absorbs O in the discharged gas of the aerobic tank₂CO discharged after purification₂Entering a microalgae reactor) to be connected,

the sludge outlet of the sludge gas reactor is connected with the inlet of the aerobic tank, the exhaust port of the aerobic tank is connected with the air inlet of the sludge gas reactor, and the gas outlet of the sludge gas reactor is connected with the microalgae reactor; the algae-liquid separator is connected with the microalgae reactor through a return pipe.

Further, the microalgae reactor is connected with a solar energy capturing device and an auxiliary power supply device for supplying power.

Still further, a domestic sewage preprocessor is arranged on a pipeline at the front end of the anaerobic tank.

Furthermore, an aeration pipe is arranged in the aerobic tank and is connected with an external air blower, and an aerobic sludge discharge port of the aerobic tank is connected with an aerobic microbial reactor; the first algae mud separator is connected with the aerobic microorganism reactor through a return pipe; the second algae mud separator is connected with the aerobic microorganism reactor through a return pipe.

And furthermore, outlets of the anaerobic tank, the facultative tank, the aerobic tank and the algae-liquid separator are connected with the dehydration and low-temperature carbonizer.

And furthermore, a gas collecting hood is arranged on the aerobic tank, an air blower is arranged on a pipeline between a gas collecting hood exhaust port of the aerobic tank and the mud gas reactor, a decarburization release pipe is arranged on the microalgae reactor, and a branch pipe of the decarburization release pipe is connected with a communication pipeline of the aerobic tank and the air blower.

Still further, the sedimentation filter is also connected with a disinfection tank.

Still further, another export of algae-laden liquid separator is connected with facultative sludge intensifier, and facultative pond and facultative sludge intensifier interconnect form a facultative sludge active cycle.

The process for treating the algae, the microorganisms and the domestic sewage comprises a microalgae system and microorganism coordination process and a microalgae system and water treatment system coordination process, wherein,

1) the cooperative process of the microalgae system and water treatment comprises the following steps:

a. the municipal sewage is pretreated and then enters an anaerobic tank, a facultative tank, an aerobic tank and a precipitation filter, and part of filtered sewage is disinfected and discharged after reaching the standard; meanwhile, the other part of the water flows back to the microalgae reactor for deep denitrification and dephosphorization and adsorption of dissolved salts and trace heavy metal substances;

b. waste gas (containing CO) discharged from aerobic tank₂) Enters a mud gas reactor and enters a microalgae reactor;

c. the sludge (containing more than% of digestive wastewater) containing nitrogen and phosphorus elements discharged from the aerobic tank enters an aerobic microbial reactor to supplement and dissolve O₂Absorbing part of carbon source metabolized by the algae liquid for biological proliferation and activation, and simultaneously absorbing part of nitrogen and phosphorus active ingredients by the microalgae,reducing the nitrogen and phosphorus content of the digested wastewater contained in the activated sludge; activated sludge enters a second algae mud separator for separation after being activated, and the activated sludge passes through a mud gas reactor and then is mixed with O in waste gas₂After the reaction, refluxing to an aerobic tank;

d. activated sludge discharged from the facultative tank enters a facultative sludge intensifier and is mixed with the other part of nutrient-rich algae solution discharged by the algae-liquid separator, and the facultative sludge absorbs the carbon source in the activated and intensified activated sludge and then flows back to the facultative tank to participate in sewage treatment;

e. activated sludge discharged from the anaerobic tank, the facultative tank and the aerobic tank enters a dehydration and low-temperature carbonizer for carbonization treatment;

2) synergistic coordination process of microalgae system and microorganisms

A. Discharging the obtained high-concentration algae liquid into an aerobic microbial reactor for deoxidation reaction; wherein, the sources of the raw materials required by the reaction of the microalgae reactor are as follows:

A1. a part of filtered sewage (reclaimed water) discharged by the precipitation filter enters a microalgae reactor (the reclaimed water is used as a supplement culture substrate of the microalgae reactor and is used as a supplement nitrogen-phosphorus trace element substrate stock solution),

A2. the gas-collecting hood of the aerobic tank collects tail gas (mainly collecting CO discharged during sewage treatment)₂) After the activated sludge separated by the mud gas reactor and the second algae mud separator is treated (the activated sludge absorbs part of O in the waste gas)₂Increasing CO in the exhaust gas₂Relative concentration), exhaust gas (containing CO)₂) Into a microalgae reactor (CO into the microalgae reactor)₂Absorbed and fixed by microalgae as a reaction carbon source);

A3. the solar energy capturing device and the auxiliary power supply device provide complementary electric energy for the microalgae reactor,

B. performing deoxidation reaction in an aerobic microbial reactor to obtain a part of deoxidized algae liquid, passing through a first algae mud separator and an algae liquid separator to obtain algae liquid, wherein the algae liquid is divided into three parts, and the first part of algae liquid flows back to the microalgae reactor for multiplication culture; the dissolved solution of the second part of the algae liquid enters a facultative sludge intensifier to be used as a nutrient oxygen solution for supplementing a carbon source; the third part of the algae liquid enters a dehydration and low-temperature carbonizer for carbonization treatment;

C. the other part of the deoxygenated algae liquid obtained by the deoxygenation reaction in the aerobic microbial reactor flows back to the aerobic microbial reactor for the deoxygenation reaction, and the sludge separated by the second algae mud separator and the O in the waste gas enter the sludge gas reactor₂And the sludge enters an aerobic tank after the reaction.

Preferably, in the step 1), the DO value in the anaerobic pool is 0mg/L in the step a; DO of the facultative tank is 0-0.5 mg/L, DO of the aerobic tank 3 is 1-2 mg/L

In the step A3, the light source frequency (according to the characteristics of the algae) of the solar energy capture device adopts the wavelength of 575 +/-10 nm; the light intensity is 4000-.

The functions of the components of the system of the utility model are as follows:

1. the microalgae reactor comprises a microalgae incubator and a microalgae reactor (belonging to the prior art) and is used for the light-dark alternating reaction of algae growth;

1.1 this reactor is fed with CO at the same time by arranging a light source to the algae incubator₂Reducing the pH value of the system and increasing the HCO of the algae liquid system₃ ^-Concentration, promoting dark reaction carbon fixation; fully absorbing the algae liquid carrying HCO in an aerobic-microalgae reactor₃ ^-And raising the system pH; for absorbing high concentration CO in algae culture box by light reaction₂Providing a powerful environment; thereby can promote CO₂The utilization rate is 10%;

1.2 the reactor makes full use of the separation and circulation of microalgae liquid between a microalgae incubator and an aerobic-microalgae reactor, so that the interference of a sludge system on the light reaction efficiency is avoided, and the light energy loss of the system is reduced; the circulating system can improve the light energy efficiency by 10 percent;

2. the gas collecting hood of the aerobic tank collects air above the aerobic tank of the sewage plant and collects CO₂Providing raw materials for the microalgae reactor; mainly collects the aerobic microorganisms in the aeration tank to metabolize CO₂And air make-up CO₂Realizing the CO of the sewage treatment system₂Emission reduction; while the algae metabolizes the remaining O₂Inputting the mixture into an aeration tank system through a blower to form a semi-closed ring form; the system is divided into microalgae and microorganismsSeparate processing, realizes O₂、CO₂The energy of the controllable microcirculation is supplied by the supplement of solar energy; to achieve high concentration of CO₂And O₂The local recovery rate is respectively improved by 80 percent and 50 percent compared with the direct use of the microalgae activated sludge in the sewage;

the principle of the process of the utility model is as follows:

1. the microalgae provide sufficient carbon source for activated sludge, and the activated sludge removes enriched inhibitor O for the microalgae₂(ii) a Wherein microalgae and aerobic sludge are cooperated, and microalgae liquid O is removed by the aerobic sludge₂The low-potential environment is provided for the facultative sludge to absorb the carbon source of the algae liquid, and the denitrification efficiency of the system is improved; characterized in that the process comprises the following steps of₂And CO₂Absorption and separation, namely the separation linkage of algae culture and sludge microbial system, is favorable for controlling the intensity of light source and the utilization rate of algae to light, and is favorable for creating different pH environments and separating inhibitor O₂To form HCO in the system recirculation₃ ^-、O₂Different concentration gradients are adopted to respectively improve the absorption utilization rate;

2. microalgae fixation of CO₂A carbon source is generated through Karlvin circulation, and the low-carbon sugar carbon source is beneficial to activating the activated sludge; firstly, the aerobic sludge and the algae liquid are mixed in a reactor for reaction, including the absorption and dissolution of O by aerobic microorganisms₂Reducing dissolved O in algae liquid system₂(reduced to 0-1 mg/L) and system potential (reduced to-100 mV), and absorbing part of carbon source; absorbing and dissolving O in the system₂The speed is obviously faster than the carbon source metabolism, so that after the mud algae is separated, the algae liquid dissolves O₂Reducing and enriching carbon sources; and then the algae liquid with enriched carbon sources is mixed with the facultative microorganism sludge for reaction, so that the activity of facultative bacteria, especially denitrifying bacteria in a low-potential environment, is improved, the use of external carbon sources is reduced accordingly, the internal carbon sources are recycled, and the high-concentration denitrification effect is achieved.

The utility model has the beneficial effects that:

the utility model utilizes the linkage of microalgae culture and activated sludge, and the aerobic microorganisms are effectively reduced by the mixing reaction of high-concentration activated sludge external circulation and the algae culture solutionThe system dissolves oxygen, reduces the inhibiting effect of the accumulated oxygen of the culture solution on the growth of the high-concentration microalgae, further improves the culture concentration of unit microalgae liquid, and strengthens the absorption and fixation of CO by the unit microalgae liquid₂The culture solution adopts the reuse water of the water in the sewage treatment system, the absorption efficiency of nitrogen and phosphorus of the system is improved by 10-20%, and the adsorption effect of algae on different heavy metals is improved, so that the content of the heavy metals in the water is further removed; by degrading sewage system CO with microorganisms₂The circulating absorption reduces the pH value of the microalgae system, and ensures the proper pH value (generally controlled at 7.5-8.0) for the growth of the algae; CO discharged by sewage treatment₂Is captured by algae to realize CO of sewage plant₂Emission reduction is 80%; microalgae fixation system CO through photosynthesis₂An easily degradable organic carbon source is generated through the metabolism of algae, so that a carbon source is provided for facultative sludge and aerobic sludge of a sewage treatment system, the digestion and denitrification reaction of the system are promoted, and the denitrification effect is achieved; the low-carbon sugar carbon source is enriched by means of algal metabolism, a high-quality carbon source is provided for a microbial sewage treatment system, the solubility is good compared with an external carbon source, the dispersibility is good, absorption is facilitated, the consumption of the external carbon source is greatly reduced, carbon emission is further reduced, and the emission of activated sludge is reduced by 30%; meanwhile, the organic matter content of the discharged excess sludge is improved, the unit heat value is further improved, and the later carbon source utilization is facilitated; the system fully utilizes the solar energy as light source energy and converts the solar energy into a day and night running light source, thereby improving the utilization rate of clean energy of the system and achieving the energy self-sufficiency rate of more than 50 percent.

In the conventional sewage treatment system, 4mg of carbon is consumed for reducing 1mg of nitrogen, and the sludge discharge amount of the system is increased by 40%; and the existing sewage treatment system is on CO₂The treatment of unorganized emission is completely not beneficial to carbon reduction and emission reduction. The treatment of the system not only reduces the carbon source adding, but also reduces the CO content of the system₂And the discharge provides an economical and feasible path for the sewage plant to save energy, reduce emission and reduce consumption. At present, the daily treatment capacity of the national town sewage treatment exceeds 2 hundred million tons, the primary estimation for emission reduction of COD is about 1.5 million tons/year, and CO is directly discharged₂About 2 million tons/year, so energy conservation and momentum reduction are necessary, and the popularization and application of the process can greatly reduce CO in the industry₂And (4) discharging the amount.

In conclusion, the utility model increases the algae culture concentration and needs to reduce the dissolved O₂High concentration accumulation and prevention of system pH drop, and improvement of light source utilization rate are effective ways for high-efficiency operation of microalgae in the system; simultaneously, the pH (about 7-9) of the system is increased, and the CO of the system is ensured₂And HCO₃ ^-(the ratio is not less than 90%) so as to increase the concentration of CO₂The fixed efficiency of (a); the algae has time difference for fixing carbon source and releasing the cumulative effect of dissolved oxygen, and can realize the dissolution of O by utilizing space separation₂Removal of CO and CO₂Fixing and strengthening step by step; the metabolites of the microalgae also have a certain inhibiting effect on the system, so that the microalgae are consumed to synthesize the metabolites to promote the microalgae Karlvin cycle production in cooperation with the microorganisms; the autotrophic algae is adopted, and has more advantages in carbon fixation than the mixed culture of heterotrophic algae in sewage.

Drawings

FIG. 1 is a schematic flow diagram of the present invention;

in the figure, an anaerobic tank 1, a facultative tank 2, an aerobic tank 3, a sedimentation filter 4, a microalgae reactor 5, a solar energy capture device 5.1, an auxiliary power supply device 5.2, a decarburization release pipe 5.3, a branch pipe 5.4, an algae-liquid separator 6, an aerobic microorganism reactor 7, a first algae-mud separator 8, a second algae-mud separator 9, a mud-gas reactor 10, a domestic sewage preprocessor 11, a blower 12, a dehydration and low-temperature carbonizer 13, a disinfection tank 14 and a facultative sludge intensifier 15.

Detailed Description

The utility model will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the utility model, but are for clear understanding.

The system for treating algae, microorganisms and domestic sewage, which is shown in fig. 1, is connected with a municipal domestic sewage pipe and comprises an anaerobic tank 1; the anaerobic tank 1 is sequentially connected with a facultative tank 2, an aerobic tank 3 and a sedimentation filter 4, and the sedimentation filter 4 is respectively connected with a disinfection tank 14 and a microalgae reactor 5;

a domestic sewage preprocessor 11 is arranged on a pipeline at the front end of the anaerobic tank 1; the microalgae reactor 5 is connected with a solar energy capturing device 5.1 and an auxiliary power supply device 5.2 for supplying power;

the outlet of the microalgae reactor 5 is connected with an aerobic microorganism reactor 7, and the aerobic microorganism reactor 7 is respectively connected with a first algae mud separator 8 and a second algae mud separator 9; the first algae mud separator 8 and the second algae mud separator 9 are respectively connected with the algae-laden liquid separator 6 and the mud-gas reactor 10, the mud outlet of the mud-gas reactor 10 is connected with the inlet of the aerobic pool 3, the gas-collecting hood exhaust port of the aerobic pool 3 is connected with the gas inlet of the mud-gas reactor 10, and a blower 12 is arranged on a pipeline between the gas-collecting hood exhaust port of the aerobic pool 3 and the mud-gas reactor 10;

the gas outlet of the mud gas reactor 10 is connected with the microalgae reactor 5; the algae-liquid separator 6 is connected with the microalgae reactor 5 through a return pipe; the outlets of the anaerobic tank 1, the facultative tank 2, the aerobic tank 3 and the algae-liquid separator 6 are all connected with a dehydration and low-temperature carbonizer 13;

an aeration pipe is arranged in the aerobic tank 3, the aeration pipe is connected with an external blower 12, and an aerobic sludge discharge port of the aerobic tank 3 is connected with an aerobic microbial reactor 7; the first algae mud separator 8 is connected with the aerobic microorganism reactor 7 through a return pipe; the second algae mud separator 9 is connected with the aerobic microorganism reactor 7 through a return pipe.

The microalgae reactor 5 is provided with a decarburization release pipe 5.3, and a branch pipe 5.4 of the decarburization release pipe 5.3 is connected with a communication pipeline of the aerobic tank 3 and the blower 12; the other outlet of the algae-liquid separator 6 is connected with a facultative sludge intensifier 15, and the facultative tank 2 and the facultative sludge intensifier 15 are connected with each other to form a facultative sludge active cycle.

The algae, microorganism and domestic sewage treatment process comprises a microalgae system and microorganism coordination process and a microalgae system and water treatment system coordination process, wherein,

a. municipal sewage is pretreated and then enters an anaerobic tank 1, a facultative tank 2, an aerobic tank 3 and a precipitation filter 4 in sequence, and part of filtered sewage is disinfected and discharged after reaching the standard; meanwhile, the other part of the water flows back to the microalgae reactor 5 for deep denitrification and dephosphorization and adsorption of dissolved salts and trace heavy metal substances; wherein the content of the first and second substances,

b. the waste gas (containing CO) discharged from the aerobic tank 3₂) Enters a mud gas reactor 10 and enters a microalgae reactor 5;

c. the sludge (containing more than 90 percent of digestion wastewater) containing nitrogen and phosphorus elements and discharged from the aerobic tank 3 enters an aerobic microbial reactor 7 for supplementing and dissolving O₂Absorbing part of carbon source metabolized by the algae liquid for biological proliferation and activation, and simultaneously absorbing part of nitrogen and phosphorus active ingredients by the microalgae, so as to reduce the nitrogen and phosphorus content of the digested wastewater contained in the activated sludge; activated sludge enters a second algae mud separator 9 for separation after being activated, and the activated sludge passes through a mud gas reactor 10 to be separated from O in waste gas₂After the reaction of the waste gas, the waste gas flows back to the aerobic tank 3;

d. activated sludge discharged from the facultative tank 2 enters the facultative sludge intensifier 15 and is mixed with the other part of nutrient-rich algae solution discharged by the algae-liquid separator 6, and the facultative sludge absorbs carbon source activity in the activated sludge and then flows back to the facultative tank 2 to participate in sewage treatment;

e. activated sludge discharged from the anaerobic tank 1, the facultative tank 2 and the aerobic tank 3 enters a dehydration and low-temperature carbonizer 13 for carbonization treatment;

f. wherein the reflux amount of the facultative tank activated sludge is controlled to be 100-200% through the facultative activated sludge intensifier, the reflux amount of the aerobic tank activated sludge is controlled to be 100-200% through the aerobic microbial reactor; precipitating and filtering the water in the sewage treatment system, and recycling 10-30% of the water to the microalgae reactor to reduce the nitrogen and phosphorus content of the system; refluxing the digestion liquid of the aerobic tank to the facultative tank to improve the denitrification effect of the system, wherein the reflux is generally controlled to be 100-300%;

2) synergistic coordination process of microalgae system and microorganisms

A. Discharging the obtained high-concentration algae liquid cultured by the microalgae reactor 5 into an aerobic microorganism reactor 7 for deoxidation reaction; wherein, the sources of the raw materials required by the reaction of the microalgae reactor 5 are as follows:

A1. a part of the filtered sewage (reclaimed water) discharged from the precipitation filter 4 enters a microalgae reactor 5 (the reclaimed water is used as a supplementary culture medium of the microalgae reactor 5 to doFor supplementing nitrogen and phosphorus trace element substrate stock solution), the concentration of microalgae is generally controlled to be 1-100 g/L; CO is increased by arranging equipment such as micropore aeration and the like in the microalgae reactor₂Solubility, CO in general solution₂With HCO₃ ^-The concentration is about 0.01-1.0mol/L, and the absorption reaction is strengthened; the microalgae reactors are arranged in a layered manner, the exposure intensity and range are reasonably adjusted, and meanwhile, the surface cleaning can be carried out by utilizing aeration; meanwhile, the algae species can preferably improve the metabolic population and preferentially inoculate the ethanol metabolic algae species; the discharge port of the microalgae reactor is connected to a return pipeline of a blower for gas return and CO increase₂The contact reaction time of the gas in the microalgae reactor is generally controlled to be 200-400% of reflux ratio, and the gas-liquid ratio of the system is controlled to be 10-30;

A2. the gas-collecting hood of the aerobic tank 3 collects tail gas (mainly collecting CO discharged during sewage treatment)₂) After the activated sludge separated by the mud gas reactor 10 and the second algae mud separator 9 is treated (the activated sludge absorbs part of O in the waste gas)₂Increasing CO in the exhaust gas₂Relative concentration), exhaust gas (containing CO)₂) Into the microalgae reactor 5 (CO entering the microalgae reactor 5)₂Absorbed and fixed by microalgae as a reaction carbon source);

A3. the solar energy capturing device 5.1 and the auxiliary power supply device 5.2 provide complementary electric energy for the microalgae reactor 5, wherein the light source frequency of the solar energy capturing device 5.1 selects the adopted wavelength to be 575 +/-10 nm according to the characteristics of the microalgae; the light intensity is 4000-;

B. performing deoxidation reaction in an aerobic microbial reactor 7 to obtain a part of deoxidized algae liquid, passing through a first algae mud separator 8 and an algae liquid separator 6 to obtain algae liquid, wherein the algae liquid is divided into three parts, and the first part of algae liquid flows back to a microalgae reactor 5 for multiplication culture; the dissolved solution of the second part of the algae solution enters a facultative sludge intensifier 14 to be used as a nutrient oxygen solution for supplementing a carbon source, and the ratio of the algae solution to the sludge is generally controlled to be 1: 1; the third part of the algae liquid enters a dehydration and low-temperature carbonizer 13 for carbonization treatment, and the residual microalgae is discharged, wherein the discharge amount is controlled to be 10-30% generally according to the culture concentration of the algae liquid and the requirements of dephosphorization and denitrification; the separation of organic carbon source liquid is completed in algae liquid separation equipment, and the mixing and separating time is controlled within 30 min; residual algae liquid and sludge are subjected to cooperative dehydration, drying and carbonization treatment, and organic matter volatile content of residual activated sludge subjected to microalgae treatment is increased by 10-30%;

C. the algae liquid obtained by the deoxidation reaction in the aerobic microbial reactor 7 and separated by entering the second algae mud separator 9 flows back to the aerobic microbial reactor 7 to participate in the deoxidation reaction, the algae liquid is metabolized to O2 through the absorption of microorganisms, the concentration is generally 6.5-20 mg/L, and the mixing residence time is controlled to be about 30min, preferably reduced to 1-2 mg/L; the sludge separated by the second algae mud separator 9 enters a mud gas reactor 10 and is mixed with O2 in the waste gas, and the sludge enters the aerobic tank 3 after the reaction.

Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.

Claims

1. An algae, microorganism and domestic sewage treatment system, the system is connected with a municipal domestic sewage pipe, and the system is characterized in that: it comprises an anaerobic pool (1); the anaerobic tank (1) is sequentially connected with a facultative tank (2), an aerobic tank (3), a precipitation filter (4) and a microalgae reactor (5); the outlet of the microalgae reactor (5) is connected with an aerobic microbial reactor (7), and the aerobic microbial reactor (7) is respectively connected with a first algae mud separator (8) and a second algae mud separator (9);

the first algae mud separator (8) and the second algae mud separator (9) are respectively connected with an algae-laden liquid separator (6) and a mud-gas reactor (10),

the sludge outlet of the sludge gas reactor (10) is connected with the inlet of the aerobic pool (3), the exhaust port of the aerobic pool (3) is connected with the air inlet of the sludge gas reactor (10), and the gas outlet of the sludge gas reactor (10) is connected with the microalgae reactor (5); the algae-liquid separator (6) is connected with the microalgae reactor (5) through a return pipe.

2. The algae, microorganism and domestic sewage treatment system of claim 1, wherein: the microalgae reactor (5) is connected with a solar energy capturing device (5.1) and an auxiliary power supply device (5.2) for supplying power.

3. The algae, microorganism and domestic sewage treatment system of claim 1, wherein: a domestic sewage preprocessor (11) is arranged on the pipeline at the front end of the anaerobic tank (1).

4. The algae, microorganism and domestic sewage treatment system of claim 1, wherein: an aeration pipe is arranged in the aerobic tank (3), the aeration pipe is connected with an external air blower (12), and an aerobic sludge discharge port of the aerobic tank (3) is connected with an aerobic microorganism reactor (7); the first algae mud separator (8) is connected with the aerobic microorganism reactor (7) through a return pipe; the second algae mud separator (9) is connected with the aerobic microorganism reactor (7) through a return pipe.

5. The algae, microorganism and domestic sewage treatment system of claim 1, wherein: the outlets of the anaerobic tank (1), the facultative tank (2), the aerobic tank (3) and the algae-liquid separator (6) are connected with a dehydration and low-temperature carbonizer (13).

6. The algae, microorganism and domestic sewage treatment system of claim 1, wherein: the device is characterized in that a gas collecting hood is arranged on the aerobic tank (3), an air blower (12) is arranged on a pipeline between a gas collecting hood exhaust port of the aerobic tank (3) and the mud gas reactor (10), a decarburization release pipe (5.3) is arranged on the microalgae reactor (5), and a branch pipe (5.4) of the decarburization release pipe (5.3) is connected with a communication pipeline of the aerobic tank (3) and the air blower (12).

7. The algae, microorganism and domestic sewage treatment system of claim 1, wherein: the sedimentation filter (4) is also connected with a disinfection tank (14).

8. The algae, microorganism and domestic sewage treatment system of claim 1, wherein: the other outlet of the algae-liquid separator (6) is connected with a facultative sludge intensifier (15), and the facultative tank (2) and the facultative sludge intensifier (15) are connected with each other to form a facultative sludge active cycle.