CN110980949A - Activated sludge multiplication method - Google Patents

Abstract

The invention discloses an activated sludge multiplication method, which comprises the following steps: the method has the beneficial effects that the granular sludge is cultured, the granular sludge is screened, and the underflow granular sludge is refluxed, and the method has the following beneficial effects: the granular sludge is well screened and reflows, and the sludge amount to be subsequently treated is reduced; the functions of simultaneously degrading organic matters, removing nitrogen and phosphorus are realized, and the water quality of effluent is integrally improved; the existing pipeline is used for reconstruction, so that the reconstruction cost is reduced; the mode is simple and easy to operate, and the energy consumption and the operation cost are reduced.

Description

Activated sludge multiplication method

Technical Field

The invention relates to the technical field of industrial wastewater treatment, in particular to an activated sludge multiplication method.

Background

The investigation shows that by the second quarter of 2015, the daily sewage treatment capacity of urban sewage treatment plants which are put into operation in China reaches about 1.61 billion cubic meters, the annual power consumption exceeds 110 billion kilowatts, the daily sewage treatment capacity accounts for about half or more of the operation cost of sewage treatment facilities, and the power consumption proportion of the operation cost of small and medium-sized sewage treatment plants in China is higher. In recent years, extensive research is carried out at home and abroad for reducing the energy consumption of sewage plants, at present, the modes of upgrading and modifying technology, optimizing process parameters, replacing energy-saving equipment, operating at different peaks, improving the operation level of staff and the like are mainly used, the effluent is ensured to be discharged up to the standard, energy conservation and consumption reduction are realized, the treatment cost is reduced, and the method is popularized and used by various sewage treatment plants. However, the above method needs sufficient manpower, material resources, financial resources and support of new technology, and compared with a large-scale sewage treatment plant, a small and medium-sized sewage treatment plant has many problems of low technical level, insufficient technical staff, short expenditure and the like, and especially, the shortage of expenditure directly limits the normal operation of the small and medium-sized sewage treatment plant.

At present, the sewage treatment process commonly used in China is an activated sludge process, mainly utilizes flocculent sludge (mixed liquid suspended solid MLSS) containing microorganisms to remove influent water solubility and granular organic matters, removes the mixed liquid suspended solid in the process flow by standing and precipitating, uses the precipitated sludge as concentrated sludge to flow back to a biological reaction tank from a precipitation tank again, and utilizes residual sludge to control the retention time of the sludge, so that the activated sludge keeps good treatment capacity and sedimentation performance, the high-efficiency treatment of the biological reaction tank is ensured, the clarification and precipitation separation functions of a secondary precipitation tank are promoted, and the load impact bearing capacity of the whole activated sludge system can be improved. In order to realize better wastewater treatment and sludge reduction effects under the conditions of higher efficiency, economy and low consumption, the invention provides an activated sludge multiplication method by taking reinforcement measures on the return sludge.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the technical defects and provide an activated sludge multiplication method, so that the screened activated sludge is refluxed to replace the traditional reflux mode, and on the premise of ensuring the normal operation of a sewage plant and the standard discharge of effluent, the sludge is reduced, the energy consumption is reduced, and the operation cost is reduced.

In order to achieve the purpose of the invention, the invention adopts the technical scheme that: an activated sludge multiplication method comprises the following steps: culturing granular sludge, screening the granular sludge and refluxing the underflow granular sludge, which comprises the following specific steps:

(1) culturing granular sludge: in the water treatment system, microorganisms contact with a biological carrier or adsorb the microorganisms and the biological carrier to form initial granular sludge, the microorganisms in the initial granular sludge continuously grow, extracellular polymers are secreted, cells are continuously adhered and gathered together, finally, the granular sludge starts to be shaped under the action of hydraulic shearing force, the structure is tighter, and the microorganisms in the granular sludge stably grow and tend to mature;

(2) screening granular sludge: mature granular sludge enters a sludge storage tank, then enters a sludge cyclone separator after large silt and other inorganic matters are removed by a fine grid, and is separated and divided into underflow sludge and overflow sludge after passing through the separator;

(3) refluxing underflow granular sludge: the underflow granular sludge passing through the separator flows back to the biological reaction tank, and the overflow sludge is sent to a sludge dewatering machine for dewatering treatment and disposal.

The invention has the beneficial effects that: the granular sludge is well screened and reflows, and the sludge amount to be subsequently treated is reduced; the functions of simultaneously degrading organic matters, removing nitrogen and phosphorus are realized, and the water quality of effluent is integrally improved; the existing pipeline is used for reconstruction, so that the reconstruction cost is reduced; the method is simple and easy to operate, and the energy consumption and the operation cost are reduced; compared with the traditional activated sludge, the granular sludge obtained by the activated sludge multiplication technology has the advantages of good sedimentation performance, good biological activity, large biomass, difficult sludge expansion and good impact load resistance.

Drawings

FIG. 1 is a flow diagram of an activated sludge doubling process according to the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

With the attached drawings, the activated sludge multiplication method comprises the following steps: culturing granular sludge, screening the granular sludge and refluxing the underflow granular sludge, which comprises the following specific steps:

(1) culturing granular sludge: in the water treatment system, microorganisms contact with a biological carrier or adsorb the microorganisms and the biological carrier to form initial granular sludge, the microorganisms in the initial granular sludge continuously grow, extracellular polymers are secreted, cells are continuously adhered and gathered together, finally, the granular sludge starts to be shaped under the action of hydraulic shearing force, the structure is tighter, and the microorganisms in the granular sludge stably grow and tend to mature; compared with the traditional activated sludge, the granular sludge prepared by the activated sludge multiplication technology has the advantages of good settling property, good biological activity, large biomass, difficult sludge expansion and good impact load resistance.

(2) Screening granular sludge: mature granular sludge enters a sludge storage tank, then enters a sludge cyclone separator after large silt and other inorganic matters are removed by a fine grid, and is separated and divided into underflow sludge and overflow sludge after passing through the separator;

(3) refluxing underflow granular sludge: the underflow granular sludge passing through the separator flows back to the biological reaction tank, and the overflow sludge is sent to a sludge dewatering machine for dewatering treatment and disposal.

In addition, as the granular sludge microflora forms an aerobic layer, an anoxic layer and an anaerobic layer through the diffusion and mass transfer action of substrates, the aerobic layer can realize the nitrification, the anoxic layer and the anaerobic layer can realize the denitrification, and the phosphate is removed from water through the accumulation of phosphate microorganisms, the method simultaneously realizes the functions of degrading organic matters, removing nitrogen and removing phosphorus.

The present invention and the embodiments thereof have been described above, but the description is not limited to the embodiments, but only one of the embodiments of the present invention, and the actual embodiments are not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (1)

1. An activated sludge multiplication method is characterized in that: the activated sludge multiplication method comprises the following steps: culturing granular sludge, screening the granular sludge and refluxing the underflow granular sludge, which comprises the following specific steps:

(1) culturing granular sludge: in the water treatment system, microorganisms contact with a biological carrier or adsorb the microorganisms and the biological carrier to form initial granular sludge, the microorganisms in the initial granular sludge continuously grow, extracellular polymers are secreted, cells are continuously adhered and gathered together, finally, the granular sludge starts to be shaped under the action of hydraulic shearing force, the structure is tighter, and the microorganisms in the granular sludge stably grow and tend to mature;

(2) screening granular sludge: mature granular sludge enters a sludge storage tank, then enters a sludge cyclone separator after large silt and other inorganic matters are removed by a fine grid, and is separated and divided into underflow sludge and overflow sludge after passing through the separator;

(3) refluxing underflow granular sludge: the underflow granular sludge passing through the separator flows back to the biological reaction tank, and the overflow sludge is sent to a sludge dewatering machine for dewatering treatment and disposal.

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