Sewage treatment agents, sewage treatment systems and applications

Abstract

The present invention relates to the field of sewage treatment technology, and specifically to a sewage treatment agent, sewage treatment system, and application thereof that simultaneously remove pollutants, reduce greenhouse gas emissions, and recover nitrogen and phosphorus resources. The sewage treatment agent comprises 0.1 to 0.15 parts by weight of magnetic iron and manganese ore, 1 to 2 parts by weight of activated sludge, and 5 to 10 parts by weight of algae liquid. The sewage treatment system comprises a UPSB reactor, an ultrasonic tank, and a magnetic suction tank. The UPSB reactor comprises a housing, a reaction chamber disposed within the housing, and a gas collector disposed above the reaction chamber. The sewage treatment agent is disposed within the reaction chamber, a water inlet is provided at the bottom of the reaction chamber, a water outlet is provided at the top of the reaction chamber, and the outlet of the gas collector is connected to the bottom of the reaction chamber via a pipe. The ultrasonic tank is connected to the discharge port at the bottom of the UPSB reactor, and the sewage treatment agent after reaction in the UPSB reactor is transported to the ultrasonic tank. The magnetic suction tank is connected to the ultrasonic tank. The system can effectively purify and treat urban sewage, ensure water safety, and achieve nitrogen and phosphorus resource recovery and greenhouse gas emission reduction in sewage.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment agent, a sewage treatment system and applications. Background Art

[0002] Currently, with population growth and rising urbanization levels, urban sewage discharge will continue to increase, further exacerbating the pressure on the aquatic ecosystem. Traditional sewage treatment processes, which rely on microbial metabolism to remove nitrogen and phosphorus from wastewater, not only emit large amounts of greenhouse gases but also make it difficult to recover these elements from the water. Furthermore, these processes require aeration, agitation, and the installation of secondary sedimentation tanks, which require significant space and are costly.

[0003] At present, the use of algae for biological treatment of wastewater has been widely studied and has great application prospects. Algae and bacteria can use pollutants in sewage to form symbiotic particles. Their symbiosis can promote the absorption of nitrogen and phosphorus in sewage by algae, thereby improving the efficiency of sewage purification. If the algae-bacteria symbiosis can be recovered, the recovery of nitrogen and phosphorus in sewage can be achieved. However, the absorption rate of nitrogen and phosphorus in sewage by the current algae-bacteria symbiotic process still needs to be improved, and the removal rate of difficult-to-degrade substances in sewage is low. The algae-bacteria symbiosis formed is loose and has poor sedimentation performance. It is necessary to set up operating units such as secondary sedimentation tanks to recover the algae-bacteria symbiosis, which takes up a lot of land and consumes a lot of energy, and it is difficult to utilize the algae-bacteria symbiosis as a resource. After the organic matter in the sewage is degraded by the algae-bacteria symbiosis, a large amount of carbon dioxide is still discharged, and zero greenhouse gas emissions from the process are not achieved. Therefore, it is necessary to develop new technical processes to solve problems such as the granulation, resource utilization, and greenhouse gas emissions of the algae-bacteria symbiosis. Summary of the Invention

[0004] The purpose of the present invention is to provide a sewage treatment agent, a sewage treatment system and its application, which can effectively purify and treat urban sewage, ensure water safety, and achieve the recovery of nitrogen and phosphorus resources in sewage and zero greenhouse gas emissions.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a sewage treatment agent comprising 0.1 to 0.15 parts by weight of magnetic iron-manganese mineral, 1 to 2 parts by weight of activated sludge, and 5 to 10 parts by weight of algae liquid.

[0007] Furthermore, the magnetic iron-manganese mineral uses magnetite as the magnetic core and iron-manganese binary oxide as the coating material, and is prepared by adopting a heterogeneous nucleation process in a manganese ore leachate.

[0008] Furthermore, the algae liquid is a spherical or filamentous green algae liquid with a dry matter content of 0.1-0.2 g / L.

[0009] In a second aspect, the present invention provides a sewage treatment system comprising an upflow photosynthetic sludge bed (UPSB) reactor, an ultrasonic tank, and a magnetic tank, connected in sequence via pipelines. The UPSB reactor comprises a housing, a reaction chamber disposed within the housing, and a gas collector disposed above the reaction chamber. The sewage treatment agent described herein is placed within the reaction chamber of the UPSB reactor, a water inlet is provided at the bottom of the reaction chamber, a water outlet is provided at the top of the reaction chamber, and the outlet of the gas collector is connected to the bottom of the reaction chamber via a pipeline. The ultrasonic tank is connected to the discharge port at the bottom of the UPSB reactor, and the sewage treatment agent after reaction in the UPSB reactor is transported to the ultrasonic tank, where ultrasonic waves are used to break up algae and bacteria adsorbed on the surface of magnetic iron-manganese minerals, forming a mixed solution of magnetic iron-manganese minerals and broken algae and bacteria. The magnetic tank is connected to the ultrasonic tank and is used to receive the mixed solution of magnetic iron-manganese minerals and broken algae and bacteria discharged from the ultrasonic tank and separate the magnetic iron-manganese minerals from the broken algae and bacteria by magnetic action. The ultrasonic tank is provided with a return pipe connected to the bottom of the UPSB reactor.

[0010] Furthermore, the shell is cylindrical and made of transparent material.

[0011] Furthermore, a light-emitting column is vertically fixed in the middle of the UPSB reaction chamber, and the light-emitting column provides a constant light cycle of 12 hours of light and 12 hours of darkness through a control unit.

[0012] Furthermore, the magnetic iron-manganese minerals separated by the magnetic absorption pool are sent to the reaction chamber of the UPSB reactor through a reflux pipe, thereby realizing the recycling of the magnetic iron-manganese minerals.

[0013] Furthermore, the algae and fungi fragments separated by the magnetic suction pool are discharged and dehydrated to achieve the recovery of nitrogen and phosphorus in the wastewater.

[0014] In a third aspect, the present invention provides use of the above-mentioned sewage treatment agent or the above-mentioned sewage treatment system in sewage treatment.

[0015] Beneficial effects of the present invention:

[0016] 1. The current algae-bacteria symbiotic process still urgently needs to improve its absorption rate of nitrogen and phosphorus in sewage, and the removal rate of difficult-to-degrade substances in sewage is low. The sewage treatment agent described in the present invention introduces conductive magnetic iron-manganese minerals into the symbiotic system of algae in the algae liquid and bacteria in the sludge. Due to its natural conductivity, the magnetic iron-manganese minerals can act as electron transfer bodies, enabling electron transfer between biological cells and establishing a bioelectronic network between microalgae, bacteria, and minerals. Compared with separate systems or algae-bacteria systems, this enhances the electron transfer efficiency and enzyme activity between microalgae and bacteria, promotes the redox reaction of pollutants, and improves the removal efficiency of nitrogen, phosphorus, and new pollutants in sewage.

[0017] 2. The sewage treatment system of the present invention uses a specific sewage treatment agent added to the reaction chamber of the UPSB reactor. Traditional sewage treatment processes require aeration, stirring and other operations to maintain the growth of activated sludge in the reaction chamber. The present invention uses magnetic iron and manganese minerals to catalyze algae photosynthesis and bacterial metabolism, eliminating the need for aeration and stirring operations and saving energy.

[0018] 3. Traditional sewage treatment processes produce greenhouse gases such as carbon dioxide and methane, requiring the deployment of separate treatment equipment. The algae-bacteria-mineral granules of the present invention maintain an aerobic state within the UPSB reaction chamber, eliminating methane production. A gas collector positioned above the reaction chamber collects carbon dioxide from the reaction process and refluxes it back into the UPSB reactor, where it is completely absorbed by the algae in the algae-bacteria-mineral granules through photosynthesis, achieving zero greenhouse gas emissions.

[0019] 4. Traditional sewage treatment processes have a large sludge output, high water content, low nutrient content, and require a secondary sedimentation tank to treat the sludge. The recovery of nitrogen and phosphorus is difficult and costly, and is prone to secondary pollution. The algae-bacteria-mineral granules of the present invention can settle naturally without the need for a secondary sedimentation tank. After the granules are ultrasonically treated, the algae and bacterial cells rupture to form a nutrient solution with high concentrations of nitrogen, phosphorus, carbohydrates, etc., which can be used as livestock and poultry feed, biofuel, etc., to achieve the recycling of nutrients in sewage; the magnetic iron and manganese minerals in the granules can be separated by a magnetic field and returned to the reactor, thereby achieving the recycling of sewage treatment agents without causing secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the sewage treatment system of the present invention.

[0021] In the figure,

[0022] 1—UPSB reactor, 11—reaction chamber, 12—wastewater treatment agent, 13—gas collector, 14—water inlet pipe, 15—drain pipe, 16—luminous column, 17—water outlet weir, 18—gas reflux pipe;

[0023] 2—ultrasound pool;

[0024] 3—magnetic pool, 31—electromagnetic plate, 32—mineral return pipe.

[0025] Figure 2 It is the sewage treatment agent of the present invention.

[0026] Figure 3 This is the sewage treatment system and treatment effect described in the present invention. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0028] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0029] Example 1, see Figure 2 As shown, a sewage treatment agent includes 0.1-0.15 parts by weight of magnetic iron-manganese mineral, 1-2 parts by weight of activated sludge and 5-10 parts by weight of algae liquid.

[0030] The magnetic iron-manganese mineral uses magnetite as a magnetic core and iron-manganese binary oxide as a coating material, and is prepared by adopting a heterogeneous nucleation process in a manganese ore leaching solution.

[0031] The algae liquid is a spherical or filamentous green algae liquid with a dry matter content of 0.1-0.2 g / L.

[0032] Example 2, see Figure 1 The sewage treatment system shown includes an upflow photosynthetic sludge blanket (UPSB) reactor 1, an ultrasonic tank 2, and a magnetic tank 3, which are sequentially connected by pipes. The UPSB reactor 1 includes a housing, a reaction chamber 11 disposed within the housing, and a gas collector 13 disposed above the reaction chamber 11. The reaction chamber 11 of the UPSB reactor is filled with a sewage treatment agent 12 according to Example 1 of the present invention. The housing is cylindrical and made of a transparent material. A water inlet pipe 14 is connected to the bottom of the reaction chamber 11, serving as the water inlet. A water outlet pipe 15 is connected to the top of the reaction chamber 11, serving as the water outlet. The outlet of the gas collector 13 is connected to the bottom of the reaction chamber 11 via a pipe. Gases from the reaction process are collected by the gas collector 13 disposed above the reaction chamber 11 and all collected gases are returned to the UPSB reactor 1 to be absorbed by the algae in the algae solution through photosynthesis, achieving zero greenhouse gas emissions.

[0033] The ultrasonic tank 2 is connected to the discharge port at the bottom of the UPSB reactor 1. Inside the UPSB reactor 1, the magnetic iron-manganese minerals provide nucleus attachment points for microalgae and bacteria. The microalgae combine with free bacteria. Due to the different adhesion forces of granular sludge of different particle sizes, under the selective effects of light and oxygen, the microalgae penetrate into the granular sludge through the pore conditions or attach to the surface of the particles, forming algae-bacteria-mineral granular sludge. The wastewater treatment agent 12 after the reaction, i.e., the algae-bacteria-mineral granular sludge formed, is transported to the ultrasonic tank 2. The algae and bacteria adsorbed on the surface of the magnetic iron-manganese minerals are ultrasonically broken down to form a mixed solution of magnetic iron-manganese minerals and broken materials. The magnetic suction tank 3 is connected to the ultrasonic tank 2 to receive the mixed solution of magnetic iron-manganese minerals and broken materials discharged from the ultrasonic tank 2 and separate the magnetic iron-manganese minerals and broken materials through magnetic action.

[0034] The granular sludge obtained by this method settles naturally, eliminating the need for a secondary sedimentation tank. After ultrasonic treatment, the granular sludge forms a mixed solution with high concentrations of nitrogen, phosphorus, and carbohydrates, which can be used as livestock feed, biofuel, and other nutrients, achieving nutrient recovery. The separated magnetic iron and manganese minerals are then returned to the reactor, eliminating the discharge of mineral materials and causing no secondary pollution.

[0035] In this embodiment, a light-emitting column 16 is vertically fixed in the middle of the reaction chamber 11 , and the light-emitting column 16 provides a constant light cycle of 12 hours of light and 12 hours of darkness through a control unit.

[0036] In this embodiment, the separated magnetic iron-manganese ore is returned to the reaction chamber 11 of the UPSB reactor 1 to achieve recycling of the magnetic iron-manganese ore. The separated crushed material is collected through the upper pipe of the magnetic suction pool to achieve the purpose of recovering nitrogen and phosphorus.

[0037] In order to prevent the pipes connecting various devices from being corroded, UPVC materials are used to make the pipes connecting various devices.

[0038] A three-phase separator is located above the reaction chamber 11. A gas collector 13 is positioned above the separator. The separator has a triangular cross-section with a vertex angle between 50° and 60°, achieving three-phase separation of gas, solid, and liquid. The separated gas is collected by the gas collector 13 and returned to the UPSB reactor 1. The separated liquid is discharged from the UPSB reactor 1 through the outlet pipe 15. The separated solids sink onto the wastewater treatment agent 12 in the reaction chamber 11.

[0039] The outlet pipe 15 is located above the UPSB reactor 1 , and an outlet weir 17 is provided in front of the outlet of the outlet pipe 15 to discharge the treated sewage from the outlet pipe 15 .

[0040] Sewage treatment effect, see Figure 3The sewage treatment system described in the present invention was used to treat municipal sewage. The UPSB reactor had an effective volume of 4 L, a sewage treatment capacity of 10 L / day, a water temperature of 25±3°C, and a constant photoperiod of 14 hours light and 10 hours dark. Aeration was not required. The dissolved oxygen concentration in the UPSB reactor ranged from 5.52 to 7.55 mg / L, 2 mg / L higher than the dissolved oxygen concentration in the activated sludge aeration tank. The pH of the treated sewage was between 7.48 and 8.46, and the concentrations of ammonia nitrogen, total nitrogen, and total phosphorus met the primary discharge standards for municipal sewage treatment plants. No methane gas was produced during operation of the sewage treatment system.

[0041] Embodiment 3: Application of the sewage treatment agent described in embodiment 1 of the present invention or the sewage treatment system described in embodiment 2 of the present invention in sewage treatment.

[0042] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A sewage treatment device, characterized in that: include: A UPSB reactor comprises a housing, a reaction chamber disposed within the housing, and a gas collector disposed above the reaction chamber. A sewage treatment agent is placed within the reaction chamber of the UPSB reactor. A water inlet is provided at the bottom of the reaction chamber, a water outlet is provided at the top of the reaction chamber, and the outlet of the gas collector is connected to the bottom of the reaction chamber via a pipeline. The sewage treatment agent comprises 0.1 to 0.15 parts by weight of a magnetic iron-manganese mineral, 1 to 2 parts by weight of activated sludge, and 5 to 10 parts by weight of an algae solution. The magnetic iron-manganese mineral comprises magnetite as a core and iron-manganese binary oxide as a coating material, and is prepared using a heterogeneous nucleation process in a manganese ore leachate. The algae solution is a spherical or filamentous green algae solution having a dry matter content of 0.1 to 0.2 g / L. The ultrasonic tank is connected to the discharge port at the bottom of the UPSB reactor. The sewage treatment agent after the reaction in the UPSB reactor is transported to the ultrasonic tank, and the algae and bacteria adsorbed on the surface of the magnetic iron and manganese minerals are broken by ultrasound to form a mixed liquid of the magnetic iron and manganese minerals and the broken products. The magnetic suction pool is connected to the ultrasonic pool and is used to receive the mixed liquid of magnetic iron-manganese ore and crushed objects discharged from the ultrasonic pool and separate the magnetic iron-manganese ore and crushed objects through magnetic action.

2. The sewage treatment device according to claim 1, characterized in that: The shell is cylindrical and made of transparent material.

3. The sewage treatment device according to claim 1, characterized in that: A light-emitting column is vertically fixed in the middle of the reaction chamber, and the light-emitting column provides a constant light cycle of 12 hours of light and 12 hours of darkness through a control unit.

4. The sewage treatment device according to claim 1, characterized in that: The separated magnetic iron-manganese ore is returned to the reaction chamber of the UPSB reactor to achieve the recycling of the magnetic iron-manganese ore.

5. The sewage treatment device according to claim 1, characterized in that: The separated broken materials are collected through the upper pipe of the magnetic suction pool to achieve the purpose of recovering nitrogen and phosphorus.

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