Anaerobic sludge granules and preparation method thereof

Abstract

The invention discloses a method for preparing anaerobic sludge particles, comprising the following steps: A. adding activated carbon, anaerobic sludge and polyacrylamide into an anaerobic reactor, a core reaction zone surrounded by a filter screen is arranged at the bottom center of the anaerobic reactor, the activated carbon, anaerobic sludge and polyacrylamide are located in the core reaction zone, and a first stirring mechanism is installed in the core reaction zone; B. a water inlet pipe and a water outlet pipe are installed on the side wall of the anaerobic reactor, a second stirring mechanism is installed on the top of the anaerobic reactor, and organic wastewater is injected into the anaerobic reactor through the water inlet pipe; C. the reactants in the anaerobic reactor are stirred by the first stirring mechanism and the second stirring mechanism, and the organic wastewater is periodically circulated through the water inlet pipe and the water outlet pipe, and finally anaerobic sludge particles are prepared in the core reaction zone. The invention can improve the deficiencies of the prior art and reduce the preparation cost of anaerobic sludge particles.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to anaerobic sludge particles and a preparation method thereof. Background Art

[0002] Using anaerobic organisms to purify sewage is a method with low energy consumption and strong resistance to shock loads. Anaerobic sludge particles are a complex microbial community composed of methanogens, acetogens, and hydrolytic fermentation bacteria, which can effectively improve the anaerobic decomposition effect of sewage. The natural formation process of anaerobic sludge particles is very slow, so there are many artificial preparation methods of anaerobic sludge particles in the prior art. However, the preparation methods in the prior art are relatively costly. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an anaerobic sludge granule and a preparation method thereof, which can solve the deficiencies of the prior art and reduce the preparation cost of the anaerobic sludge granule.

[0004] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0005] A method for preparing anaerobic sludge granules comprises the following steps:

[0006] A. Adding activated carbon, anaerobic sludge and polyacrylamide into an anaerobic reactor, wherein a core reaction zone surrounded by a filter screen is provided at the bottom center of the anaerobic reactor, wherein the activated carbon, anaerobic sludge and polyacrylamide are located in the core reaction zone, and a first stirring mechanism is installed in the core reaction zone;

[0007] B. A water inlet pipe and a water outlet pipe are installed on the side wall of the anaerobic reactor, and a second stirring mechanism is installed on the top of the anaerobic reactor to inject organic wastewater into the anaerobic reactor through the water inlet pipe;

[0008] C. The reactants in the anaerobic reactor are stirred by the first stirring mechanism and the second stirring mechanism, and the organic wastewater is periodically circulated through the water inlet pipe and the water outlet pipe, and finally anaerobic sludge particles are produced in the core reaction area.

[0009] Preferably, the reactants further include ferric chloride, and the mass ratio of activated carbon, anaerobic sludge, polyacrylamide and ferric chloride is 210:1000:2:1, and the activated carbon is 50-mesh particles.

[0010] Preferably, the temperature of the organic wastewater in the anaerobic reactor is 34-36° C., the pH value of the organic wastewater is 6.5-6.8, and the initial COD value of the organic wastewater is 1000-1500 mg / L.

[0011] Preferably, when the COD value of the organic wastewater in the anaerobic reactor drops to 700 mg / L, the wastewater is drained through the outlet pipe, and then new organic wastewater is added through the inlet pipe to restore the COD value of the organic wastewater in the anaerobic reactor to above 1000 mg / L.

[0012] Preferably, the total reaction time of the reactants and the organic wastewater is 25 to 30 hours.

[0013] Preferably, the first stirring mechanism includes a first base connected to the motor, a vertical guide cylinder is fixed to the center of the first base, a plurality of through grooves are provided on the side wall of the guide cylinder close to one end of the first base, a first stirring blade is fixed to the edge of the first base, the filter is a single-leaf hyperbolic shape, the inner diameter of the filter gradually increases from bottom to top, and a vertical guide plate is fixed to the free end of the first stirring blade, and the height of the guide plate is 1 / 3 of the height of the filter.

[0014] Preferably, the second stirring mechanism comprises a second base connected to the motor, a second stirring blade is obliquely fixed to the edge of the second base, and the second stirring blade is located outside the filter.

[0015] Preferably, the first stirring mechanism rotates in opposite directions to the second stirring mechanism, the second stirring mechanism rotates continuously for stirring, the first stirring mechanism stops for 10 minutes every 30 minutes of stirring, and the rotation speed of the first stirring mechanism is 1.5 to 2 times that of the second stirring mechanism.

[0016] Anaerobic sludge granules are prepared using the above-mentioned method for preparing anaerobic sludge granules.

[0017] Preferably, the diameter of the anaerobic sludge particles is 3 to 6 mm.

[0018] The beneficial effect brought about by adopting the above technical scheme is that the present invention adopts the method of centralized stirring of activated carbon and anaerobic sludge, which accelerates the speed of activated carbon adsorbing anaerobic sludge to form anaerobic sludge particles. Driven by the first stirring blade, the flow rate of organic wastewater at the edge of the core reaction zone is greater than the flow rate of organic wastewater in the guide tube area, which makes the organic wastewater in the core reaction zone form a circulation trend of entering the guide tube from the through groove and then flowing out from the top of the guide tube, effectively improving the tumbling efficiency of anaerobic sludge particles in the core reaction zone and the contact efficiency with organic wastewater. The first mixer rotates in opposite directions to the second stirring mechanism, which can accelerate the exchange circulation rate of organic wastewater inside and outside the core reaction zone. The shape of the filter can improve the uniformity of the circulation distribution of anaerobic sludge particles in the core reaction zone, and the guide plate is used to effectively stir the anaerobic sludge particles at the bottom edge of the core reaction zone, thereby further improving the generation rate of anaerobic sludge particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a structural diagram of an anaerobic reactor in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0020] Reference Figure 1 A method for preparing anaerobic sludge granules comprises the following steps:

[0021] A. Add activated carbon, anaerobic sludge, polyacrylamide and ferric chloride into an anaerobic reactor 1. A core reaction zone surrounded by a filter screen 2 is provided at the bottom center of the anaerobic reactor 1. The activated carbon, anaerobic sludge and polyacrylamide are located in the core reaction zone. A first stirring mechanism is installed in the core reaction zone. The mass ratio of activated carbon, anaerobic sludge, polyacrylamide and ferric chloride is 210:1000:2:1, and the activated carbon is 50 mesh particles.

[0022] B. A water inlet pipe 3 and a water outlet pipe 4 are installed on the side wall of the anaerobic reactor 1. A second stirring mechanism is installed on the top of the anaerobic reactor 1. Organic wastewater is injected into the anaerobic reactor 1 through the water inlet pipe 3. The temperature of the organic wastewater in the anaerobic reactor 1 is 34-36° C., the pH value of the organic wastewater is 6.5-6.8, and the initial COD value of the organic wastewater is 1000-1500 mg / L.

[0023] C. The reactants in the anaerobic reactor 1 are stirred by the first stirring mechanism and the second stirring mechanism, and the organic wastewater is periodically circulated through the water inlet pipe 3 and the water outlet pipe 4, and finally anaerobic sludge particles are produced in the core reaction area; when the COD value of the organic wastewater in the anaerobic reactor 1 drops to 700 mg / L, it is drained through the water outlet pipe 4, and then new organic wastewater is added through the water inlet pipe 3 to restore the COD value of the organic wastewater in the anaerobic reactor 1 to above 1000 mg / L; the total reaction time of the reactants and the organic wastewater is 25 to 30 hours.

[0024] The first stirring mechanism includes a first base 5 connected to a motor (not shown in the figure), a guide tube 6 in a vertical direction is fixed at the center of the first base 5, a plurality of through grooves 7 are provided on the side wall of the guide tube 6 near one end of the first base 5, a first stirring blade 8 is fixed at the edge of the first base 5, the filter screen 2 is a single-leaf hyperboloid shape, the inner diameter of the filter screen 2 gradually increases from bottom to top, a guide plate 9 in a vertical direction is fixed at the free end of the first stirring blade 8, and the height of the guide plate is 1 / 3 of the height of the filter screen 2. The second stirring mechanism includes a second base 11 connected to a motor (not shown in the figure), a second stirring blade 10 is fixed at an angle at the edge of the second base 11, and the second stirring blade 10 is located outside the filter screen 2. The first mixer rotates in the opposite direction to the second stirring mechanism, and the second stirring mechanism rotates and stirs continuously. The first stirring mechanism stops for 10 minutes every 30 minutes of stirring, and the rotation speed of the first stirring mechanism is 1.5 to 2 times the rotation speed of the second stirring mechanism.

[0025] The diameter of the anaerobic sludge granules prepared by the above-mentioned preparation method of anaerobic sludge granules is 3-6 mm. The preparation cost of the anaerobic sludge granules can be as low as 320 yuan / ton.

[0026] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing anaerobic sludge granules, characterized in that The following steps are involved: A. Adding activated carbon, anaerobic sludge and polyacrylamide into an anaerobic reactor (1); a core reaction zone surrounded by a filter screen (2) is provided at the center of the bottom of the anaerobic reactor (1); the activated carbon, anaerobic sludge and polyacrylamide are located in the core reaction zone; a first stirring mechanism is installed in the core reaction zone; the first stirring mechanism comprises a first base (5) connected to a motor; a guide tube (6) in a vertical direction is fixed at the center of the first base (5); a plurality of through grooves (7) are provided on the side wall of the guide tube (6) close to one end of the first base (5); a first stirring blade (8) is fixed at the edge of the first base (5); the filter screen (2) is in the shape of a single-leaf hyperboloid; the inner diameter of the filter screen (2) gradually increases from bottom to top; a guide plate (9) in a vertical direction is fixed at the free end of the first stirring blade (8); the height of the guide plate is 1 / 3 of the height of the filter screen (2); B. A water inlet pipe (3) and a water outlet pipe (4) are installed on the side wall of the anaerobic reactor (1); a second stirring mechanism is installed on the top of the anaerobic reactor (1); organic wastewater is injected into the anaerobic reactor (1) through the water inlet pipe (3); the second stirring mechanism comprises a second base (11) connected to the motor; a second stirring blade (10) is fixedly inclined on the edge of the second base (11); and the second stirring blade (10) is located outside the filter screen (2); C. The reactants in the anaerobic reactor (1) are stirred by the first stirring mechanism and the second stirring mechanism, and the organic wastewater is periodically circulated through the water inlet pipe (3) and the water outlet pipe (4), and finally anaerobic sludge particles are produced in the core reaction area; the rotation direction of the first stirring mechanism is opposite to that of the second stirring mechanism, and the second stirring mechanism rotates continuously for stirring, and the first stirring mechanism stops for 10 minutes after stirring for 30 minutes, and the rotation speed of the first stirring mechanism is 1.5 to 2 times the rotation speed of the second stirring mechanism.

2. The method for preparing anaerobic sludge granules according to claim 1, characterized in that: The reactants also include ferric chloride, activated carbon, anaerobic sludge, polyacrylamide and ferric chloride in a mass ratio of 210:1000:2:1, and the activated carbon is 50-mesh particles.

3. The method for preparing anaerobic sludge granules according to claim 2, characterized in that: The temperature of the organic wastewater in the anaerobic reactor (1) is 34-36°C, the pH value of the organic wastewater is 6.5-6.8, and the initial COD value of the organic wastewater is 1000-1500 mg / L.

4. The method for preparing anaerobic sludge granules according to claim 3, characterized in that: When the COD value of the organic wastewater in the anaerobic reactor (1) drops to 700 mg / L, the wastewater is discharged through the outlet pipe (4), and then new organic wastewater is added through the inlet pipe (3) to restore the COD value of the organic wastewater in the anaerobic reactor (1) to above 1000 mg / L.

5. The method for preparing anaerobic sludge granules according to claim 4, characterized in that: The total reaction time of the reactants and the organic wastewater is 25 to 30 hours.

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