CN110862144A - Anaerobic biological treatment desulfurization method - Google Patents
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- CN110862144A CN110862144A CN201911201604.1A CN201911201604A CN110862144A CN 110862144 A CN110862144 A CN 110862144A CN 201911201604 A CN201911201604 A CN 201911201604A CN 110862144 A CN110862144 A CN 110862144A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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Abstract
The invention relates to a desulfurization method by anaerobic biological treatment, which comprises the following steps: carrying out first anaerobic reaction treatment on sewage to be treated under the action of thiophilic anaerobic sludge, converting sulfur and sulfate radicals in the sewage into hydrogen sulfide under the action of microorganisms, and discharging the hydrogen sulfide in a gas form to obtain primarily desulfurized sewage; and carrying out secondary anaerobic reaction treatment on the primarily desulfurized sewage under the action of conventional anaerobic sludge to obtain desulfurized and anaerobic treated sewage. According to the invention, the desulfurization tank is additionally arranged in front of the anaerobic reactor, so that the sulfate radical concentration in the wastewater can be effectively reduced, the anaerobic removal efficiency is improved, the COD in the wastewater can be partially removed while the sulfate radical concentration is reduced, the treatment pressure of the anaerobic reactor is reduced, the stable operation of the whole anaerobic system is ensured, mechanical equipment is not needed, the power consumption is saved, the system construction investment is reduced, the operation process is simple, the investment is less, the management and the operation are convenient, and the production management and operation cost is low.
Description
Technical Field
The invention relates to a desulfurization method by anaerobic biological treatment, belonging to the technical field of pulping and papermaking environment-friendly water treatment and purification.
Background
In recent years, with the gradual implementation of national environmental protection policies, the investment construction of industrial enterprises on sewage treatment systems is gradually strengthened. Because the available water amount of people in our country is relatively low, the use cost of industrial water is increased year by year, the sewage discharge requirement is continuously perfected and stricted, the country also limits the use amount of fresh water per ton product in some industries in recent years, the circulation of the production water is increased in some industries for reducing the use amount of fresh water per ton product, the production water is gradually deteriorated, and the COD is gradually increased. Before 2014, the sulfate content in the waste paper pulping and papermaking sewage is generally below 500. In recent years, with the decrease of the quality of the waste paper, the content of chemicals in the recovered waste paper is increased, and the sulfate radical content of the waste paper pulping and papermaking wastewater is increased to more than 800-1000 mg/L. As is well known, the conventional anaerobic microorganisms for anaerobic treatment are very sensitive to sulfate radical content, the sulfate radical content in wastewater is generally below 500mg/L under normal conditions, when the sulfate radical content in wastewater exceeds 800, the operation of an anaerobic system is seriously influenced, the anaerobic removal efficiency and the removal capacity are greatly reduced, the operation and treatment difficulty of the whole sewage treatment system is increased, the investment and construction scale of the anaerobic and aerobic systems are increased by times, the operation cost is increased linearly, and the stable standard discharge is difficult to realize.
When high-sulfur wastewater is treated, biochemical effluent is generally adopted to flow back and dilute anaerobic influent water so as to ensure the stable operation of a system, and the concentration of sulfate radicals in the wastewater is reduced. For example, chinese patent document CN103723823A discloses a self-circulation iron salt desulfurization anaerobic reactor. The reactor main body is provided with an anaerobic reaction system and an iron salt desulfurization system; the anaerobic reaction system is provided with a water distribution area, a reaction area, a separation area and a reflux area; the iron salt desulfurization system is provided with an iron salt desulfurization area and an iron salt regeneration area. Hydrogen sulfide generated in the reaction zone is led into an iron salt desulfurization zone through a separation zone, ferric iron oxidizes the hydrogen sulfide into elemental sulfur, and product ferrous iron is led into an iron salt regeneration zone, is oxidized into ferric iron and then flows to the iron salt desulfurization zone, so that the recycling of iron salt is realized. The anaerobic biogas generation amount of the method is greatly influenced, and the method cannot meet the enterprise requirements, thereby causing resource waste. In addition, because the removal rate of sulfate radicals in sewage is low in the anaerobic and aerobic treatment processes, the content of the sulfate radicals in biochemical effluent is still high, and in order to meet the requirement that the wastewater enters an anaerobic system for treatment, the reflux quantity of the aerobic effluent can reach 1-4 times of the water inflow under the general condition of meeting the requirement of the sulfate radical content. For example, CN101955826A discloses an aerobic/anaerobic integrated biogas safety biological desulphurization device. The device comprises an elemental sulfur precipitation zone, an aerobic biogas biological desulfurization section, an anaerobic biogas biological desulfurization section and a spraying system which are connected. The elemental sulfur precipitation zone is provided with an inverted conical sulfur discharge hopper and a sulfur discharge pipe; the aerobic biogas biological desulfurization section is provided with a disc-shaped aerator, a dissolved oxygen probe, a conical gas collector, an annular gas-blocking inclined plate, a gas-guide pipe, a nutrient solution input cylinder and a nutrient solution output cylinder; the anaerobic biogas biological desulfurization section is provided with a disc-shaped gas distributor, a biological filler layer and a biogas collecting pipe; the spraying system is provided with a water inlet tank, a peristaltic pump and a disk-shaped sprayer. The method has low removal efficiency of an anaerobic system, leads more biochemical effluent to flow back, causes the increase of the aerobic biochemical treatment water quantity by times or several times, and increases the volume of an aeration tank required by aerobic biochemical treatment and the power consumption of a motor matched with aeration proportionally, thus directly causing the proportional increase of construction cost, floor area, operation cost and management difficulty.
Disclosure of Invention
Aiming at the defects of the prior art, the current situation that the sulfur and sulfate radical content of the pulping and papermaking wastewater is increased continuously cannot be met and adapted by the existing anaerobic treatment system, the invention provides an anaerobic treatment method with a special desulfurization device.
The technical scheme of the invention is as follows:
a method for desulfurization by anaerobic biological treatment comprises the following steps:
carrying out first anaerobic reaction treatment on sewage to be treated under the action of thiophilic anaerobic sludge, converting sulfur and sulfate radicals in the sewage into hydrogen sulfide under the action of microorganisms, and discharging the hydrogen sulfide in a gas form to obtain primarily desulfurized sewage; and carrying out secondary anaerobic reaction treatment on the primarily desulfurized sewage under the action of conventional anaerobic sludge to obtain desulfurized and anaerobic treated sewage.
According to the invention, preferably, the temperature of the sewage to be treated is controlled to be 15-42 ℃ or 48-60 ℃ before the first anaerobic reaction; when the temperature of the sewage is controlled to be 15-42 ℃, performing medium-low temperature anaerobic reaction; when the temperature of the sewage is controlled to be 48-60 ℃, high-temperature anaerobic reaction is carried out;
preferably, the pH value of the first anaerobic reaction is controlled to be 5.5-8.
According to the invention, the mass concentration of the thiophilic anaerobic sludge is preferably controlled to be 2-80g/L in the first anaerobic reaction process.
According to the present invention, it is preferable that most of the sulfur and sulfate substances in the wastewater after the first anaerobic reaction are discharged in the form of hydrogen sulfide gas, and a small amount of the sulfur and sulfate substances are converted into elemental sulfur or thiosulfate and mixed in the primarily desulfurized wastewater.
According to the invention, preferably, the thiophilic anaerobic sludge is mixed sludge of particles and flocculent sludge or flocculent sludge; more preferably, the thiophilic anaerobic sludge contains thiophilic microorganisms such as acidophilic sulfur-oxidizing bacteria and micelle bacteria.
According to the invention, preferably, the temperature of the sewage in the second anaerobic reaction process is controlled to be 15-42 ℃;
preferably, the pH value of the second anaerobic reaction is controlled to be 6-9.
According to the invention, the mass concentration of the conventional anaerobic sludge is preferably controlled to be 3-80g/L in the second anaerobic reaction process.
According to the invention, preferably, sulfur and sulfate radicals in the sewage after the second anaerobic reaction are converted into biogas mixed gas and discharged in the form of gas; one part of the conventional anaerobic sludge is returned to the first or second anaerobic reaction process for recycling, and the other part of the conventional anaerobic sludge is directly discharged or discharged after precipitation.
According to the invention, preferably, the conventional anaerobic sludge is flocculent sludge or mixed flocculent and granular sludge, and the anaerobic sludge is not totally made of granular sludge, so as to prevent calcification of the sludge.
According to the invention, preferably, the method for desulfurization by anaerobic biological treatment is carried out by adopting the following treatment devices:
the treatment device comprises a desulfurization tank, an anaerobic reactor and a mud-water separation tank, wherein the desulfurization tank is provided with a sewage inlet, a sludge feed inlet, a mechanical stirring device and a first exhaust port; the sludge-water separation tank is provided with a sewage outlet, a sludge discharge port and a second exhaust port;
the desulfurization tank is connected with the anaerobic reactor through a first liquid inlet; the anaerobic reactor is connected with the mud-water separation tank through a second liquid inlet; the sludge discharge port is connected with the sludge feed port through a sludge reflux pump;
the desulfurization tank is set to be one or composed of two or more desulfurization tanks which are connected in series. When the sulfate radical content in the wastewater is not lower than 1000mg/L, the desulfurization tank is formed by connecting 2 or more desulfurization tanks in series, and the treatment effect is better.
And a sludge discharge port is arranged between the sludge feed port and the sludge discharge port.
The anaerobic reactor is connected with the sludge discharge port through a sludge reflux pump.
The method comprises the following steps:
starting a desulfurization tank and an anaerobic reactor, controlling the temperature of the sewage at 15-42 ℃ or 48-60 ℃, allowing the sewage to enter the desulfurization tank through a water inlet to perform a first anaerobic reaction, controlling the pH value of the desulfurization tank at 5.5-8, and discharging sulfur and sulfate radicals in the sewage from a first exhaust port in the form of hydrogen sulfide; the primarily desulfurized sewage enters an anaerobic reactor from a first liquid inlet to carry out secondary anaerobic reaction, the temperature of the primarily desulfurized sewage is controlled to be 15-42 ℃, the pH value is controlled to be 6-9, and sulfur and sulfate radicals in the sewage are discharged from a second gas outlet in a methane mixed gas mode; and the desulfurized and anaerobic sewage enters the sludge-water separation tank from the second liquid inlet, the water separated by the sludge-water separation tank is discharged from the sewage outlet, the separated sludge is discharged from the sludge discharge port or flows back to the sludge removal tank and the anaerobic reactor through the sludge reflux pump, and the redundant sludge is discharged through the sludge discharge port in the backflow process.
According to the present invention, it is preferable that both the thiophilic anaerobic sludge in the desulfurization tank and the conventional anaerobic sludge in the anaerobic reactor are mixed sludge of granules and floccules, or flocculent sludge.
According to the invention, the mud-water separation tank is preferably a conical separation tank or a flat-bottom separation tank.
The invention has not been described in detail, but is in accordance with the state of the art.
The sewage enters the system and then enters the desulfurization tank for first anaerobic reaction, most of sulfur substances in the wastewater are converted into hydrogen sulfide to be separated from the wastewater, and the hydrogen sulfide is discharged out of the system through the first exhaust port. The sulfate radical content in the waste water after desulfurization is greatly reduced, the requirement of the anaerobic reactor on the sulfate radical content can be met, after the primarily desulfurized waste water enters the anaerobic reactor, pollutants in the waste water can be effectively decomposed by anaerobic bacteria, the efficiency of the anaerobic reactor on waste water treatment is improved, and the COD and BOD values of the waste water after anaerobic treatment can be effectively reduced. Meanwhile, the biogas yield can be improved, the resource utilization of wastewater is realized, waste is changed into valuable, and a larger economic value is obtained.
The invention has the beneficial effects that:
1. the invention can effectively reduce the sulfate radical concentration in the wastewater and improve the anaerobic removal efficiency by additionally arranging the desulfurization tank in front of the anaerobic reactor, and can partially remove COD in the wastewater while reducing the concentration of sulfate radicals, reduce the treatment pressure of the anaerobic reactor, ensure the stable operation of the whole anaerobic system and have higher removal efficiency, can greatly increase the methane yield of the system while stabilizing and improving the removal efficiency, realize changing waste into valuable, the method creates the maximum economic value while effectively reducing pollutants, thoroughly solves the problem that the high-sulfur wastewater is difficult to be treated anaerobically, reduces the load of pollutants entering aerobic biochemical treatment, greatly reduces the power consumption of an aerobic system and the medicine consumption of advanced treatment, and further, the ton water treatment cost of the whole sewage treatment system is effectively reduced, the resources are effectively saved, and the win-win effect is realized.
2. The sulfate radical removing method adopts a microorganism processing method, does not need mechanical equipment, saves power consumption, reduces system construction investment, and has simple operation process, less investment, convenient management and operation and low production management and operation cost.
Drawings
FIG. 1 is a schematic view of the main structure of the desulfurization device for anaerobic biological treatment according to the present invention.
Wherein: 1. the device comprises a first desulfurization tank, 1-1 parts of a sewage inlet, 1-2 parts of a sludge inlet, 1-3 parts of a sewage outlet, 1-4 parts of a sludge outlet, 2 parts of a second desulfurization tank, 3 parts of a first liquid inlet, 4 parts of a mechanical stirring device, 5 parts of an anaerobic reactor, 6 parts of a mud-water separation tank, 7 parts of a sludge reflux pump, 8 parts of a first exhaust port, 9 parts of a second exhaust port, 10 parts of a sludge discharge port, 11 parts of a second liquid inlet.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following specific examples.
The equipment used in the examples is conventional equipment unless otherwise specified, and the chemical raw materials are conventional commercially available raw materials.
Wherein, the thiophilic anaerobic sludge in the desulfurization tank and the conventional anaerobic sludge in the anaerobic reactor are both mixed sludge of particles and flocculent sludge or flocculent sludge.
In the embodiment, the mass concentration of the thiophilic anaerobic sludge is controlled to be 2-80g/L in the first anaerobic reaction process, and the mass concentration of the conventional anaerobic sludge is controlled to be 2-80g/L in the second anaerobic reaction process.
Example 1
A method for desulfurization by anaerobic biological treatment comprises the following steps:
carrying out first anaerobic reaction treatment on the sewage to be treated under the action of thiophilic anaerobic sludge, converting sulfur and sulfate radicals in the sewage into hydrogen sulfide under the action of microorganisms, and discharging the hydrogen sulfide in a gas form to obtain primarily desulfurized sewage; and carrying out secondary anaerobic reaction treatment on the primarily desulfurized sewage under the action of conventional anaerobic sludge to obtain desulfurized and anaerobic treated sewage.
Before the first anaerobic reaction, the temperature of the sewage to be treated is controlled to be 15-42 ℃, the pH value of the first anaerobic reaction is controlled to be 5.5-8, most of sulfur and sulfate radicals in the sewage after the first anaerobic reaction are discharged in the form of hydrogen sulfide gas, and a small amount of sulfur or thiosulfate is converted into monomer sulfur or thiosulfate to be mixed in the primarily desulfurized sewage.
The thiophilic anaerobic sludge is mixed sludge of particles and flocculent sludge or flocculent sludge;
the temperature of the sewage subjected to primary desulfurization in the second anaerobic reaction process is controlled to be 15-42 ℃, and the pH value is controlled to be 6-9; sulfur and sulfate radicals in the sewage are discharged from the second exhaust port in the form of methane; one part of the conventional anaerobic sludge is returned to the first or second anaerobic reaction process for recycling, and the other part of the conventional anaerobic sludge is directly discharged or discharged after precipitation.
Example 2
As shown in figure 1, the method for desulfurizing by anaerobic biological treatment is carried out by adopting the following treatment devices:
the treatment device comprises a desulfurization tank, an anaerobic reactor 5 and a mud-water separation tank 6, wherein the desulfurization tank is provided with a sewage inlet 1-1, a sludge feed inlet 1-2, a mechanical stirring device 4 and a first exhaust port 8; the mud-water separation tank is provided with a sewage outlet 1-3, a sludge outlet 1-4 and a second exhaust port 9;
the desulfurization tank consists of a first desulfurization tank 1 and a second desulfurization tank 2;
the desulfurization tank is connected with the anaerobic reactor 5 through a first liquid inlet 3; the anaerobic reactor 5 is connected with the mud-water separation tank 6 through a second liquid inlet 11; the sludge discharge port 1-4 is connected with the sludge feed port 1-2 through a sludge reflux pump 7;
comprises the following steps
Starting a desulfurization tank and an anaerobic reactor 5, controlling the temperature of the sewage at 15-42 ℃, allowing the sewage to enter the desulfurization tank through a water inlet to perform a first anaerobic reaction, controlling the pH value of the desulfurization tank at 5.5-8, and discharging sulfur and sulfate radicals in the sewage from a first exhaust port 8 in the form of hydrogen sulfide; the primarily desulfurized sewage enters an anaerobic reactor 5 from a first liquid inlet 3 to carry out a second anaerobic reaction, the temperature of the primarily desulfurized sewage is controlled to be 15-42 ℃, the pH value is controlled to be 6-9, and sulfur and sulfate radicals in the sewage are discharged from a second gas outlet 9 in a methane form; the desulfurized sewage enters the mud-water separation tank 6 from the second liquid inlet 12, the water separated by the mud-water separation tank 6 is discharged from the sewage water outlet 1-3, the separated sludge is discharged from the sludge discharge port 1-4 or flows back to the desliming tank and the anaerobic reactor through the sludge reflux pump 7, and the redundant sludge is discharged through the sludge discharge port in the backflow process.
Example 3
As described in example 2, except that:
the sewage inlet temperature of the desulfurization tank is 48-60 ℃.
Example 4
As described in example 2, except that:
the mud-water separation tank 6 is a conical separation tank.
Comparative example 1
A method for treating high-sulfur waste water includes adding a large amount of barium hydroxide or barium chloride solution to the waste water before the waste water is treated by anaerobic treatment, reacting with sulfate radical in the waste water to form barium sulfate precipitate, and separating the sulfate radical from the waste water.
Comparative example 2
As described in example 2, except that:
the sewage to be treated is only subjected to primary anaerobic treatment by the desulfurization tank, and is not subjected to secondary anaerobic treatment by the anaerobic reactor 5.
Comparative example 3
As described in example 2, except that:
the sewage to be treated is directly treated by anaerobic reactor 5 for the second anaerobic treatment, and is not treated by the first anaerobic treatment in the desulfurizing tank
Test examples
The desulfurization treatment effect test was performed for the modes in example 2 and comparative examples 2 and 3, respectively. The sewage to be treated is high-sulfur high-pollution load waste water generated by producing packaging paper by using domestic waste paper as a raw material, the sewage treatment process adopts a physicochemical treatment and desulfurization anaerobic treatment method, the sulfate radical concentration in the waste water is 1000mg/L, COD to be 6000mg/L after the original waste water is subjected to physicochemical treatment, tests are respectively carried out according to the process of example 2 and the processes of comparative example 2 and comparative example 3, and the test data are detailed in Table 1.
TABLE 1
| Item | Example 2 | Comparative example 2 | Comparative example 3 |
| Sulfate concentration mg/L before treatment | 1000 | 1000 | 1000 |
| COD concentration mg/L before treatment | 6000 | 6000 | 6000 |
| The concentration of sulfate radical after treatment is mg/L | 160 | 300 | 800 |
| COD concentration after treatment mg/L | 600 | 3600 | 2400 |
| Sulfate radical removal rate% | 84 | 60 | 20 |
| COD removal rate% | 90 | 20 | 50 |
Note: the sulfate radical removal rate (sulfate radical concentration before treatment-sulfate radical concentration after treatment) ÷ sulfate radical concentration before treatment × 100%
The total COD removal rate (total COD concentration before treatment-total COD concentration after treatment) ÷ total COD concentration before treatment × 100%
As can be seen from Table 1, the anaerobic biological desulfurization method of the present invention has better treatment effect than the anaerobic treatment with the desulfurization tank alone, the anaerobic treatment with the anaerobic reactor alone, and the simple addition of the two.
The sulfur in the high-sulfur wastewater is generally SO4 2-Form (SO) in the first anaerobic reaction4 2-Under the action of microorganisms, most of the sulfur is converted into HS, the HS is separated from water, and a small amount of the HS is converted into monomer sulfur or thiosulfate to be mixed in the primarily desulfurized sewage, so that the treatment pressure of a subsequent anaerobic reactor is reduced, and the stable operation of the whole anaerobic system is ensured. Subsequent second anaerobic reaction due to SO of influent4 2-The content is low, the function of the anaerobic reactor can be fully exerted, the removal efficiency is high, pollutants are effectively reduced, and the removal of sulfate radicals in the wastewater is increased.
Claims (10)
1. A method for desulfurization by anaerobic biological treatment comprises the following steps:
carrying out first anaerobic reaction treatment on sewage to be treated under the action of thiophilic anaerobic sludge, converting sulfur and sulfate radicals in the sewage into hydrogen sulfide under the action of microorganisms, and discharging the hydrogen sulfide in a gas form to obtain primarily desulfurized sewage; and carrying out secondary anaerobic reaction treatment on the primarily desulfurized sewage under the action of conventional anaerobic sludge to obtain desulfurized and anaerobic treated sewage.
2. The method for desulfurization by anaerobic biological treatment according to claim 1, wherein the temperature of the wastewater to be treated is controlled to 15 to 42 ℃ or 48 to 60 ℃ before the first anaerobic reaction;
preferably, the pH value of the first anaerobic reaction is controlled to be 5.5-8.
3. The method for desulfurization by anaerobic biological treatment according to claim 1, wherein the mass concentration of the thiophilic anaerobic sludge is controlled to be 2 to 80g/L during the first anaerobic reaction.
4. The method for desulfurization by anaerobic biological treatment as claimed in claim 1, wherein the sulfur and sulfate substances in the wastewater after the first anaerobic reaction are mostly discharged in the form of hydrogen sulfide gas, and a small amount of substances are partially converted into elemental sulfur or thiosulfate to be mixed in the primarily desulfurized wastewater.
5. The method for desulfurization by anaerobic biological treatment according to claim 1, wherein the thiophilic anaerobic sludge is a mixed sludge of granules and floccules, or a flocculent sludge; further preferably, the thiophilic anaerobic sludge contains acidophilic sulfur oxidizing bacteria and micelle bacteria.
6. The method for desulfurization by anaerobic biological treatment according to claim 1, wherein the temperature of the wastewater in the second anaerobic reaction process is controlled to be 15-42 ℃;
preferably, the pH value of the second anaerobic reaction is controlled to be 6-9.
7. The method for desulfurization by anaerobic biological treatment according to claim 1, wherein the mass concentration of the conventional anaerobic sludge during the second anaerobic reaction is controlled to be 3 to 80 g/L.
8. The method for desulfurization by anaerobic biological treatment according to claim 1, wherein the sulfur and sulfate substances in the wastewater after the second anaerobic reaction are converted into a biogas mixed gas and discharged in the form of a gas; one part of the conventional anaerobic sludge is returned to the first or second anaerobic reaction process for recycling, and the other part of the conventional anaerobic sludge is directly discharged or discharged after precipitation.
9. The method for desulfurization by anaerobic biological treatment according to claim 1, wherein the conventional anaerobic sludge is flocculent or a mixture of flocculent and granular sludge.
10. The method for desulfurization by anaerobic biological treatment as claimed in claim 1, wherein said method for desulfurization by anaerobic biological treatment is carried out by using the following treatment devices:
the treatment device comprises a desulfurization tank, an anaerobic reactor and a mud-water separation tank, wherein the desulfurization tank is provided with a sewage inlet, a sludge feed inlet, a mechanical stirring device and a first exhaust port; the sludge-water separation tank is provided with a sewage outlet, a sludge discharge port and a second exhaust port;
the desulfurization tank is connected with the anaerobic reactor through a first liquid inlet; the anaerobic reactor is connected with the mud-water separation tank through a second liquid inlet; the sludge discharge port is connected with the sludge feed port through a sludge reflux pump; the desulfurization tank is one or consists of two or more desulfurization tanks; a sludge discharge port is also formed between the sludge feed port and the sludge discharge port; the anaerobic reactor is connected with a sludge discharge port through a sludge reflux pump;
the method comprises the following steps:
starting a desulfurization tank and an anaerobic reactor, controlling the temperature of the sewage at 15-42 ℃ or 48-60 ℃, allowing the sewage to enter the desulfurization tank through a water inlet to perform a first anaerobic reaction, controlling the pH value of the desulfurization tank at 5.5-8, and discharging sulfur and sulfate radicals in the sewage from a first exhaust port in the form of hydrogen sulfide; the primarily desulfurized sewage enters an anaerobic reactor from a first liquid inlet to carry out secondary anaerobic reaction, the temperature of the primarily desulfurized sewage is controlled to be 15-42 ℃, the pH value is controlled to be 6-9, and sulfur and sulfate radicals in the sewage are discharged from a second gas outlet in a methane mixed gas mode; and the desulfurized and anaerobic sewage enters the sludge-water separation tank from the second liquid inlet, the water separated by the sludge-water separation tank is discharged from the sewage outlet, the separated sludge is discharged from the sludge discharge port or flows back to the sludge removal tank and the anaerobic reactor through the sludge reflux pump, and the redundant sludge is discharged through the sludge discharge port in the backflow process.
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| CN113072263A (en) * | 2021-04-28 | 2021-07-06 | 博瑞德环境集团股份有限公司 | Biological desulfurization method for wastewater |
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Application publication date: 20200306 |