CN201077804Y - Intrinsic cycle anaerobic flow equalizing double reaction tower - Google Patents

Abstract

The utility model relates to an internal circulation anaerobic flow equalizing double reaction tower, which is realized by connecting the internal circulation reaction tower and the upstream anaerobic tower in series. The internal circulation reaction tower includes flow equalizers, reaction barrels, gas collection hoods, gas-liquid separators, sewage collection channels, etc., and the upstream anaerobic tower includes water distributors, anaerobic buckets, three-phase separators, sedimentation buckets, and water collection channels wait. The wastewater inlet pipe enters the cyclone from a tangential direction through a nozzle, fully mixes with the return sludge from the gas-liquid separator, and then distributes it in the reaction zone, realizing the internal circulation of the mixed solution. After the reaction in the first tower and the separation of gas, liquid and solid, the waste water is collected through the connecting pipe of the two towers and enters the upstream anaerobic tower for anaerobic reaction to complete the waste water treatment. The sludge concentration in the reaction tower is high, the microbial biomass is large, and there is an internal circulation, the sludge is evenly distributed, and the mass transfer effect is good. The COD concentration of the treated wastewater can reach more than 10,000mg/L.

Description

Internal circulation anaerobic flow equalization double reaction tower

1. Technical field:

The utility model belongs to a chemical process device in the field of sewage treatment.

2. Background technology

The typical characteristics of anaerobic biological treatment process are large processing capacity, low energy consumption, easy control, etc., which have been widely accepted by people. From the traditional anaerobic contact process to the second-generation anaerobic biological treatment process that appeared in the 1970s, it has the characteristics of relatively high volume load, stable operation, small reactor volume, and low investment. With the development of production, the treatment of increasing high-concentration organic wastewater has become a problem that plagues people, and the contradictions of resources, energy consumption, and land occupation have also become prominent. It is becoming more and more important to continue to develop anaerobic treatment technology with more optimized technology and economy. necessary. The third-generation anaerobic biological treatment process, when pushing the internal circulation anaerobic reactor (abbreviated as IC reactor), essentially stacks two reactors together, and its characteristic is that microorganisms exist in the reaction in the form of granular sludge In the tank, the sludge concentration is very high and the volume load is very high; it has high purification efficiency; it has a large aspect ratio, generally 3 to 5 or higher; it occupies a small area.

Due to the substantial increase in the volume load of COD in the internal circulation anaerobic reactor, the internal circulation anaerobic reactor has a high processing capacity, but there are also many problems:

(1) Anaerobic treatment is a method of biological wastewater treatment. In order to improve the rate and efficiency of anaerobic treatment, it is necessary to provide a suitable growth environment for microorganisms and maintain a high concentration of sludge in the reactor. At the same time, it is necessary to There is a good mass transfer process, that is, the wastewater must have a chance to fully contact with the sludge, so that the organic matter can react with the microorganisms, and the treatment efficiency of the organic matter can be improved. In the internal circulation anaerobic reactor, the wastewater and sludge still lack this contact condition, resulting in unsatisfactory wastewater treatment efficiency.

(2) The internal structure of the internal circulation anaerobic reactor is very complicated, the design requirements are high, and the construction is difficult. The height-to-diameter ratio of the reactor is large, which brings two major problems: ① Increase the power of the water inlet pump and increase the operating cost. Originally, the biggest advantage of anaerobic treatment is low energy consumption, and the energy consumption of anaerobic treatment is just this One, therefore, the advantage of low energy consumption of anaerobic treatment is lost; ② Since the internal circulation anaerobic reactor is as high as 18-25m, the operating weight per ^m2 area is as high as 20-26 tons, which greatly exceeds the Even if the geological conditions are relatively good, the equipment foundation needs to be treated, and the investment cost will increase. This is unacceptable to general sewage treatment enterprises, and it will encounter difficulties in popularization and application.

(3) In the anaerobic reaction, there is a close relationship among organic load, gas production and treatment degree. Especially for high-concentration organic wastewater, due to the anaerobic reaction, the pH of the wastewater drops greatly, and finally reaches the level that the microorganisms cannot bear, and the internal circulation anaerobic reactor is difficult to adjust, which limits the application range of the IC reactor.

The utility model has carried out in-depth research on the internal laws of the internal circulation anaerobic reactor treatment technology, combined with engineering practice, and proposed an improvement method for the problems existing in the existing internal circulation anaerobic reactor, so as to make this technology more perfect .

3. Technical content

The utility model provides an internal circulation anaerobic equal-flow double reaction tower, which divides the reactor into two independent reaction towers, and the internal circulation reaction tower and the upper flow anaerobic tower are connected in series to exert their respective advantages, so as to increase mass transfer Speed, improve sewage treatment efficiency, the purpose of wider application.

Fig. 1 is a structural diagram of the utility model, which is realized by connecting the internal circulation reaction tower A and the upstream anaerobic tower B in series.

Internal circulation reaction tower A includes flow equalizer 1, reaction barrel 2, gas collection cover 3, gas-liquid separator 4, sewage collection channel 5, waste water inlet pipe 12 and sludge return pipe 13; upstream anaerobic tower B includes water distribution device 6, anaerobic tank 7, three-phase separator 8, settling tank 9, water collecting channel 10 and waste water outlet pipe 16; also includes external connector sludge pump 11, double tower connecting pipe 14 and sludge pipe 15. The structure of the flow equalizer is shown in FIG. 2 , which includes a swirler 17 , a float valve 18 and a nozzle 19 . The flow equalizer 1 is set at the bottom of the internal circulation reaction tower A, and a sludge return pipe 13 is set in its center to communicate with the gas-liquid separator 4 set at the top of the internal circulation reaction tower, and the gas collection cover 3 is set at the internal circulation reaction tower The upper part is in communication with the sewage collection channel 5, the water inlet pipe 12 enters the cyclone from a tangential direction through a nozzle 18, and the sewage collection channel 5 enters the bottom of the upper anaerobic tower B through the double-tower communication pipe 14 and communicates with the water distributor 6, The three-phase separator 8 is arranged on the upper part of the upper flow anaerobic tower B lower than the position of the gas collection cover 3, and it communicates with the gas collection cover 3. The settling bucket 9 is located between the three-phase separator and the water collection channel, and the waste water outlet pipe 16 is connected with the water collection channel. The collecting channel 10 is connected, the sludge pump 11 is arranged outside the two towers, and the sludge pipe 15 is connected with the gas-liquid separator 4, and several float valves 18 are evenly distributed on the flow equalizer.

The working principle of this design: the wastewater inlet pipe enters the cyclone from the tangential direction through a nozzle, fully mixes with the return sludge from the gas-liquid separator, and then the mud-water mixture is evenly distributed in the reaction zone by the float valve, so that the wastewater In full contact with the sludge particles, the mud-water mixture formed by the flow equalizer enters the reaction tank evenly. Under the action of high-concentration sludge, most of the organic matter is converted into biogas, and the mixed liquid rises under the violent agitation of the biogas to make the reaction The sludge in the bucket is in the state of expansion and fluidization, which strengthens the contact surface of mud and water, so that the sludge maintains a high activity. With the increase of biogas production, a part of the mud-water mixture is lifted by the biogas to the gas-liquid separator at the top, the lifted mixture and biogas are lifted into the gas-liquid separator in the collection hood, and the mud-water mixture is returned to the gas-liquid separator along the return pipe. The flow equalizer at the bottom realizes the internal circulation of the mixed liquid. After the reaction in the first tower and the separation of gas, liquid and solid, the waste water will enter the water distributor of the second tower (upstream anaerobic tower) from the waste water collection channel through the connecting pipe of the two towers, and evenly distribute the waste water in the anaerobic zone for secondary treatment, COD After being further degraded, the mud, water and gas after the reaction in the anaerobic zone enter the three-phase separator, the biogas is collected and enter the gas-liquid separator, and the mud-water mixture is separated into solid and liquid in the sedimentation zone. The water pipe is drained, and the settled granular sludge is returned to the sludge bed in the second anaerobic zone.

Compared with known technology, the utility model has the following advantages:

(1) High volume load: The sludge concentration in the reaction tower is high, the microbial biomass is large, and there is an internal circulation, the sludge is evenly distributed, and the mass transfer effect is good.

(2) High COD concentration of wastewater treatment: Since it is divided into two towers, the operating conditions can be controlled, and the operation is flexible. The COD concentration can reach more than 10000mg/L, and it can be used freely.

(3) Internal automatic circulation, no need for external power: ordinary anaerobic reactors must maintain a certain flow rate to achieve fluidization, and the circulation is achieved by external pressure, while this IC flow-sharing double reaction tower generates by itself The biogas is used as the driving force to realize the internal circulation of the mixed liquid. There is no need to install a circulating pump, which saves power consumption. At the same time, the reaction tower is relatively low, and the power consumption of water inlet is low, which truly implements low energy consumption.

(4) Good stability of the effluent: the secondary reaction tower is used for graded anaerobic treatment to prolong the biological residence time, and the reaction is carried out on the roof, which is convenient to adjust, the purification effect is better, and the effluent stability is better.

(5) Short start-up period: The sludge activity in the IC reactor is high, and the biological proliferation is fast, which provides favorable conditions for the rapid start-up of the reactor.

(6) Since the height of the tower is doubled, the load per ^m2 area is only 10 tons, which is less than the general ground endurance requirements, and the foundation treatment is relatively easy and the investment is small.

4. Description of the drawings: Fig. 1 is a structural diagram of the utility model, in which 1 is a flow equalizer, 2 is a reaction barrel, 3 is a gas collection cover, 4 is a gas-liquid separator, 5 is a sewage collection channel, 6 is the water distributor, 7 is the anaerobic bucket, 8 is the three-phase separator, 9 is the sedimentation bucket, 10 is the water collecting channel, 11 is the sludge pump, 12 is the waste water inlet pipe, 13 is the sludge return pipe, 14 is the double tower Connecting pipe, whether 15 is a sludge pipe, and 16 is a waste water outlet pipe. Fig. 2 is a structural diagram of the flow equalizer, in which 17 is a cyclone, 18 is a float valve, and 19 is a nozzle.

5. Specific implementation methods:

Below in conjunction with its Fig. 1, the utility model is further described.

Embodiment: Realized by connecting the internal circulation reaction tower A and the upflow anaerobic tower B in series.

Internal circulation reaction tower A includes flow equalizer 1, reaction barrel 2, gas collection cover 3, gas-liquid separator 4, sewage collection channel 5, waste water inlet pipe 12 and sludge return pipe 13; upstream anaerobic tower B includes water distribution device 6, anaerobic tank 7, three-phase separator 8, settling tank 9, water collecting channel 10 and waste water outlet pipe 16; also includes external connector sludge pump 11, double tower connecting pipe 14 and sludge pipe 15. The structure of the flow equalizer is shown in FIG. 2 , which includes a swirler 17 , a float valve 18 and a nozzle 19 . The flow equalizer 1 is set at the bottom of the internal circulation reaction tower A, and a sludge return pipe 13 is set in its center to communicate with the gas-liquid separator 4 set at the top of the internal circulation reaction tower, and the gas collection cover 3 is set at the internal circulation reaction tower The upper part is in communication with the sewage collection channel 5, the water inlet pipe 12 enters the cyclone from a tangential direction through a nozzle 18, and the sewage collection channel 5 enters the bottom of the upper anaerobic tower B through the double-tower communication pipe 14 and communicates with the water distributor 6, The three-phase separator 8 is arranged on the upper part of the upper flow anaerobic tower B lower than the position of the gas collection cover 3, and it communicates with the gas collection cover 3. The settling bucket 9 is located between the three-phase separator and the water collection channel, and the waste water outlet pipe 16 is connected with the water collection channel. The collecting channel 10 is connected, the sludge pump 11 is arranged outside the two towers, and the sludge pipe 15 is connected with the gas-liquid separator 4, and several float valves 18 are evenly distributed on the flow equalizer.

The treatment capacity is 5000 tons/day beer wastewater, the COD concentration is 2000mg/L, and the height and diameter of the first tower 6.5m, tower height 10.5m, second tower diameter 6.5m, tower height 9m, effluent COD 300mg/L, COD removal efficiency 85%.

Claims (1)

1. two reaction towers of an internal circulating anaerobic current-sharing, it is characterized in that: it is connected by internal recycle reaction tower A and upper reaches anaerobism tower B and realizes, the internal recycle reaction tower A comprises current equalizer (1), reaction container (2), gas collection cap (3), gas-liquid separator (4), sewage collecting canal (5), waste water inlet pipe (12) and mud return line (13), upper reaches anaerobism tower B comprises water distributor (6), anaerobism bucket (7), triphase separator (8), settling box (9), braiding channel (10) and wastewater effluent pipe (16), also comprise joint outer part sludge pump (11), double tower communicating pipe (14) and sludge pipe (15), current equalizer comprises swirler (17), float valve (18) and nozzle (19), current equalizer (1) is arranged at the bottom of internal recycle reaction tower A, the heart is provided with a mud return line (13) and is communicated with the gas-liquid separator that is arranged at internal recycle reaction tower top (4) therein, gas collection cap (3) is arranged at internal recycle reaction tower top and is communicated with sewage collecting canal (5), water inlet pipe (12) enters swirler by a nozzle (18) from tangential direction, sewage collecting canal (5) by entering upper reaches anaerobism tower B double tower communicating pipe (14) the bottom and be communicated with water distributor (6), triphase separator (8) is arranged at the top of the upper reaches anaerobism tower B that is lower than gas collection cap (3) position, it is communicated with gas collection cap (3), settling box (9) is between triphase separator and braiding channel, wastewater effluent pipe (16) is communicated with braiding channel (10), sludge pump (11) is arranged at outside two towers, it is communicated with gas-liquid separator (4) with sludge pipe (15), and several float valves (18) are distributed on the current equalizer.

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