CN-122010306-A - Low-carbon efficient sewage treatment device based on algae-laden granular sludge and operation method thereof

CN122010306ACN 122010306 ACN122010306 ACN 122010306ACN-122010306-A

Abstract

The invention discloses a low-carbon high-efficiency sewage treatment device based on algae granule sludge, which consists of a primary reaction area, a light supplementing area and a secondary reaction area which are mutually communicated, wherein the primary reaction area, the light supplementing area and the secondary reaction area are all arranged on a base, the whole primary reaction area is of a cylinder structure and is a core sewage treatment area, the whole reactor device comprises a water inlet, an inner cylinder baffle, an aeration device, a stirring device, a perforated plate, a backflow area and an overflow weir.

Inventors

FENG YUAN
ZHANG JINGWEN
ZUO XIONG
LI YONGTIAN
XUE JIN
LIANG BAOLIN
WANG XUEJIAO
LI YANHONG

Assignees

润田环境工程有限公司

Dates

Publication Date: 20260512
Application Date: 20260310

Claims (9)

1. The low-carbon high-efficiency sewage treatment device based on the algae-bacteria granular sludge is characterized by comprising a primary reaction zone, a light supplementing zone and a secondary reaction zone which are mutually communicated, wherein the primary reaction zone, the light supplementing zone and the secondary reaction zone are all arranged on a base; The whole primary reaction zone is of a cylindrical structure and is a core sewage treatment zone, and comprises a water inlet, an inner cylinder baffle, an aeration device, a stirring device, a perforated plate, a reflux zone and an overflow weir; The water inlet is arranged below the primary reaction zone, the inner cylinder is arranged at the central position of the primary reaction zone and is used as a main reaction zone (namely an aerobic zone) of the primary reaction zone, the aeration device is arranged right below the inner cylinder, the stirring device is arranged at the central position of the inner cylinder and is fixed at the bottom of the primary reaction zone, the perforated plate is arranged right above the inner cylinder and is separated from the top of the inner cylinder by a gap to form a gas buffer diffusion zone, the backflow zone and the inner cylinder are separated by the inner cylinder baffle, and the overflow weir is arranged above the primary reaction zone and is used for temporarily storing sewage flowing out through the perforated plate; The light supplementing area provides high-efficiency and adaptive illumination for the reaction system and comprises a light condensing device and a light supplementing device; The light supplementing device is positioned in the middle of the primary reaction zone and the secondary reaction zone, the whole light supplementing device is in a ring-shaped cylinder shape, and the ring-shaped diameter of the light supplementing device is determined according to the specific diameters of the primary reaction zone and the secondary reaction zone and the illumination intensity of the layered light source; The secondary reaction zone is an annular cylinder body positioned at the periphery of the light supplementing device, can further treat sewage and realize sedimentation separation of aged sludge, and comprises a flow guide pipe, a self-driven stirring device, a mud bucket and a water outlet; The sewage flows into the secondary reaction zone through a flow guide pipe at an outlet of the overflow weir, and is further treated by adopting MBGS technology, the self-driven stirring device directly drives the fan blades to rotate by the water inlet rotational flow hydraulic power of the secondary reaction zone without additionally arranging a motor, the sludge hopper is arranged at the bottom of the secondary reaction zone, and the water outlet is arranged at the outer side below the secondary reaction zone; the base is of a closed prolate square cavity structure and is arranged at the bottom right below the reactor device main body.
2. The low-carbon and high-efficiency sewage treatment device based on the algae-laden granular sludge, which is characterized in that a water inlet of a primary reaction zone adopts two pipelines which are arranged in parallel to carry out lower water inflow; The layout of the inner cylinder baffle plate of the primary reaction zone can be divided into an expansion section, a straight cylinder section and a contraction section from bottom to top; The arrangement width of the aeration system of the primary reaction zone is consistent with the width of the straight barrel section of the inner barrel, the inner barrel and the reflux zone are respectively used as an aerobic zone and an anoxic zone in the MBGS process, the system treatment efficiency is improved, the aeration system can be connected with the treated waste gas containing CO 2 , the aeration gas is mixed gas of air and CO 2 , wherein the proportion of the CO 2 gas is 10% -30%, more preferably, the proportion of the CO 2 gas is 15%, and the aeration system can be connected with a micro-nano bubble device to enable aeration bubbles to reach the micron level.
3. The low-carbon efficient sewage treatment device based on the algae granule sludge is characterized in that a stirring device of a primary reaction zone directly drives blades to rotate by a base magnetic field without an additional motor, the height of an inner cylinder straight section is H, the stirring device is provided with two transparent blades, 1/4H and 3/4H positions below the top of the inner cylinder straight section are respectively arranged to ensure full stirring, and the transparent blades are selected to ensure that the shielding effect of the blades on light is minimized.
4. The low-carbon efficient sewage treatment device based on the algae granule sludge is characterized in that a perforated plate of a primary reaction zone is made of transparent, corrosion-resistant and high-strength materials, and concave arch plates with circular hole diameters of 3-5 mm, aperture ratios of 50% -60% and regular triangles are staggered, and the radians of the concave arch plates are slightly increased.
5. The low-carbon efficient sewage treatment device based on the algae granule sludge, as claimed in claim 1, is characterized in that the light supplementing device takes the middle height of the reactor as a demarcation point, and adopts a layered multi-band light source structure, so that the algae biomass and the nitrogen and phosphorus removal efficiency of the system can be remarkably improved.
6. The low-carbon efficient sewage treatment device based on the algae granule sludge, which is disclosed in claim 1, is characterized in that the outer walls of the primary reaction zone and the light supplementing device are made of transparent materials, and the light supplementing device can supplement light for the primary reaction zone and the secondary reaction zone simultaneously.
7. The low-carbon high-efficiency sewage treatment device based on the algae-bacteria granular sludge, which is disclosed in claim 1, is characterized in that a guide pipe with an incidence angle and a flow speed which are accurately designed is arranged in the secondary reaction zone, so that stable rotational flow is formed in the secondary reaction zone, the mixing and mass transfer can be enhanced, the power source is provided for the subsequent hydraulic driving stirring, and the primary recovery of energy is realized; the self-driven stirring device of the secondary reaction zone is provided with four sets of conical spiral stirring devices which are vertically distributed in a cross manner and are placed at the center position of the inner diameter of the ring; The setting direction of the water outlet of the secondary reaction zone is parallel to the setting direction of the flow guide pipe, so that the sewage can complete the complete rotational flow process in the secondary reaction zone, and the hydraulic retention time is prolonged.
8. The low-carbon and high-efficiency sewage treatment device based on the algae granule sludge, which is disclosed in claim 1, is characterized in that an integrated magnetic field-temperature control partition base is selected as the base, and a magnetic generation module and a temperature control module are integrated in the base; The magnetic generation module of the base is partitioned according to the reaction characteristics of the primary reaction zone and the secondary reaction zone, different operation modes are adopted according to the reaction stage, and the temperature control module of the base independently operates the temperature control system according to the set temperature.
9. The method for operating a low-carbon and high-efficiency sewage treatment device based on algae granule sludge according to any one of claims 1 to 8, comprising the steps of: s1, sludge inoculation and system starting stage Respectively adding mature algae bacterium granular sludge with different initial sludge concentrations into an inner cylinder of a primary reaction zone and a secondary reaction zone; The base system is activated, namely a temperature control module of the base is started, and the system temperature is set and maintained; the system domestication, namely adopting a gradual change load starting mode, synchronously starting a light supplementing device, and operating according to a layered light supplementing strategy; S2, illumination period operation mode In the illumination period, except for absorbing sunlight at the top of the reactor, the light gathering device can collect sunlight and provide layered light supplement for the reactor through the light supplement device; The primary reaction zone core treatment comprises the steps of mixing sewage in an inner cylinder with high-concentration MBGS, quickly absorbing and degrading organic matters and nutrient substances ("satiating"), lifting the treated mixed liquid through a perforated plate, intercepting large-particle-size MBGS, sliding the intercepted granular sludge to a reflux zone under the action of gravity and rebound, and enabling the anaerobic environment of the zone to promote microorganisms to utilize an endogenous carbon source to perform denitrification ("starvation"); The light supplementing device provides illumination, algae photosynthesis produces oxygen, the concentration of Dissolved Oxygen (DO) in the inner cylinder is increased, the aeration device is completely closed or only operates at extremely low intensity, so that the energy consumption is greatly reduced, the magnetic field of the base drives the transparent fan blades of the stirring device to slowly rotate, so that MBGS and sewage are fully mixed and contacted, and shading is minimized; The secondary reaction zone is subjected to advanced treatment and sedimentation, namely supernatant liquid after primary treatment is temporarily stored in an overflow weir and tangentially flows into the secondary reaction zone through a flow guide pipe to form rotational flow, the rotational flow hydraulic drive self-driven stirring device is rotated without a motor to realize energy-saving mixing, pollutants are further degraded in the zone, the centrifugal force generated by the rotational flow and the magnetic field acting force generated by a base magnetic generation module are beneficial to screening of sludge particles, aged fine particles are gathered towards the center, and the sludge bucket starts to collect the precipitated aged sludge; S3, dark period operation mode The primary reaction zone mode is switched, namely illumination is stopped, algae stops producing oxygen, an aeration device is automatically started according to Dissolved Oxygen (DO), an 'impulse aeration' mode is adopted, aeration is only carried out when DO is too low, so that the oxygen required by nitrifying bacteria is ensured, the maximum energy is saved, the magnetic field of the primary reaction zone is switched to an 'intermittent magnetic field' mode, and in addition, the magnetic field intermittently drives stirring to continuously run, so that the smooth reaction is ensured, periodic magnetic stimulation is beneficial to maintaining the activity of microbial communities, and aging and inertization of the microbial communities are prevented; the secondary reaction zone strengthens sedimentation, namely the magnetic field intensity of the secondary reaction zone can be properly enhanced, and the flocculation and sedimentation of MBGS are promoted by utilizing the magnetic flocculation effect; S4, daily maintenance and sludge management The water outlet monitoring, namely periodically detecting the water quality of a water outlet, and finely adjusting parameters such as water inlet flow, aeration intensity, magnetic field mode and the like according to the water quality of the water outlet; And (3) sludge discharge and recovery, namely, periodically opening a sludge discharge valve at the bottom of the sludge hopper to discharge the enriched aged sludge, and enabling the discharged sludge to enter subsequent digestion treatment or recycling and culturing the granular sludge still active therein and then re-feeding the granular sludge back into the reactor to maintain the activity and concentration of the sludge in the system.

Description

Low-carbon efficient sewage treatment device based on algae-laden granular sludge and operation method thereof Technical Field The invention relates to the technical field of sewage treatment, in particular to a low-carbon high-efficiency sewage treatment device based on algae-laden granular sludge and an operation method thereof. Background In recent years, regarding pollution reduction and carbon reduction in the field of sewage treatment, china is actively searching and advancing. However, the conventional activated sludge process (CAS) is the most commonly used biological treatment process in sewage treatment systems, and it is difficult to meet the requirement of sustainable development under the "two carbon" goal due to the problems of high energy consumption, greenhouse gas emission, and disposal of excess sludge. In contrast, the algae granule sludge (microalgal-bacterial granular sludge, MBGS) process can realize the cyclic utilization of oxygen (O 2) and carbon dioxide (CO 2) through the synergistic coupling of photosynthesis and respiration, greatly reduce aeration energy consumption and carbon emission, further integrate microalgae recycling potential and high-efficiency sedimentation of granule sludge, and is expected to become a mainstream, green and sustainable sewage treatment process in the future. However, the current MBGS technology has three major bottleneck problems: 1) The continuous flow operation is unstable, the existing MBGS system is mostly operated in a sequencing batch reactor, and the problems of discontinuous water outlet, low volume utilization rate, difficult large-scale application and the like exist. Particle disintegration and algae separation easily occur in a continuous flow mode, so that the denitrification and dephosphorization efficiency is reduced. 2) The energy consumption is large, the traditional aeration combined with mechanical stirring occupies more than 60 percent of the water consumption per ton, and the photosynthesis oxygen supply advantage of the algae can not be fully exerted. 3) The illumination efficiency is low, the light intensity of the deep water area is insufficient to cause the inactivation of the bottom algae, and the treatment efficiency of the system is limited. In addition, MBGS also requires precise temperature and nutrient control, controllable gas supply and effective space utilization efficiency to ensure efficient and stable reaction processes. In the prior art, a light source is adopted for top or side irradiation, for example, in the prior art CN105692884a, a sequencing batch reactor (SBAR) is disclosed, an inner and outer double-layer cylinder structure of which serves for gas stripping circulation and granular sludge culture, and the light source is arranged at the top, and the operation mode is a periodic intermittent operation of 'water inlet-anaerobic-aeration-sedimentation-drainage'. Patent technology CN105961303A discloses an ecological breeding system for fish-bacteria-algae symbiosis, wherein a photo-bioreactor is of a single-layer structure, and a built-in strip light source is wound on a membrane component, so that microalgae growing in a suspending way can receive uniform illumination. Both of the above-mentioned patent solutions do not relate to continuous flow modes of operation nor to designs for zoning and stereoscopic light filling through multilayer sleeves, and the manner of overhead and side light sources also makes the occupied space larger. 4) In the prior patent solutions, for example, CN120483392 adopts magnetic iron oxide nanoparticles and permanent magnets to establish a static magnetic field to perform algae aggregation nucleation and improve the microbial activity, but the solution is simply and directly used for biological stimulation, and a driving mechanism is separately required for water stirring in the sewage treatment process, so that the volume of the device is further increased. Other prior art patents such as CN121470696a disclose a sewage treatment device based on tricomponent algae granule sludge, but the specific sewage treatment process is not substantially improved and specifically disclosed, but merely conventional prior operations. Therefore, aiming at the problems, a low-carbon high-efficiency sewage treatment device based on algae-laden granular sludge and an operation method thereof are provided. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a low-carbon high-efficiency sewage treatment device based on algae-laden granular sludge and an operation method thereof. The technical scheme of the invention is as follows: In a first aspect, the invention provides a low-carbon efficient sewage treatment device based on algae granule sludge, wherein the whole device body consists of a primary reaction zone, a light supplementing zone and a secondary reaction zone which are mutually communicated, and all parts are arranged on an integrated base. Th