A saline-alkali water treatment and aquaculture coupling power generation process and a regulation method

Abstract

The application discloses a kind of saline-alkali water treatment aquaculture coupling power generation process and regulation method, including 1000 PP power generation barrel units, which are provided with series microbial fuel cell power generation pairs for treating high salinity concentrated salt water and generating electric energy;1000 PP aquaculture barrel units receive the water body treated by power generation barrel for aquaculture;A large water storage tank / water regulating tank is used to regulate and store aquaculture tail water and stabilize system water quality;A domestic water production unit desalinates saline-alkali water source into domestic water and transports the generated concentrated salt water to the power generation barrel unit;A set of hierarchical hydraulic circulation system drives water circulation between units;A matrix power management system is used to series step-up, parallel confluence of low-voltage direct current generated by thousands of power generation barrel units, and unified management and utilization.The application realizes efficient synergy and recycling of water resources, salt, electric energy and heat by multi-stage coupling of salt water desalination, biological power generation, waste heat utilization and aquaculture.

Description

Technical Field

[0001] This invention relates to the fields of saline-alkali water resource utilization, bioelectrochemistry, seawater desalination and large-scale aquaculture technology, and particularly to a saline-alkali water treatment aquaculture coupled with power generation process and control method. Background Technology

[0002] With the development and utilization of saline-alkali water resources and the rapid development of the marine aquaculture industry in my country, how to efficiently utilize high-salinity water resources and achieve energy self-sufficiency has become an urgent technical problem to be solved.

[0003] Prior art 1 (the applicant already has patent ZL202411310326.4) discloses a method for using microorganisms to reduce saline water into modern seawater suitable for seafood farming. This method transforms brine from salt lakes with a salinity of 170‰-250‰ into aquaculture water with a salinity of 25‰-35‰. This method has been mass-produced in Qiemo and Kizilsu Kyrgyz Autonomous Prefecture, Xinjiang.

[0004] Prior art 2 (application filed by the applicant, application number 202610203083.7) discloses an apparatus and method for preparing domestic water using underground saline water and seawater desalination, which can convert high-salinity raw water into fresh water that can be used for domestic purposes, thus solving the fresh water demand problem of large-scale bases.

[0005] However, in the actual operation of large-scale breeding bases, the above-mentioned existing technologies still have the following shortcomings: 1. Risk of relying solely on a single water source: If aquaculture relies solely on microbially treated saline water as its water source, water shortages may occur in the aquaculture system when there are drastic fluctuations in the salinity of the raw water or when the supply is insufficient, which may affect the stability of production.

[0006] 2. Salinity accumulation in the reservoir: In a recirculating aquaculture system, water evaporation and aquaculture metabolism cause the salinity of the reservoir to rise slowly. If not controlled, it will exceed the suitable salinity range for the cultured organisms, affecting their growth and survival rate.

[0007] 3. Unresolved freshwater demand: Large-scale aquaculture bases not only require water for aquaculture, but also freshwater for staff living and equipment cleaning. Current technologies have not been able to achieve a coordinated supply of freshwater and aquaculture water.

[0008] 4. High energy consumption: Seawater desalination, aquaculture oxygenation, and hydrodynamic circulation all require a large amount of electricity, and current technologies have not achieved energy self-sufficiency or partial self-sufficiency.

[0009] 5. Low system integration: The power generation system, water treatment system, and aquaculture system operate independently, failing to form a closed-loop synergy of "water production-power generation-aquaculture-storage regulation", resulting in low resource utilization efficiency.

[0010] Therefore, there is an urgent need for a system and method that can deeply couple saline water treatment for power generation, seawater desalination for water production, and large-scale aquaculture. Summary of the Invention

[0011] The purpose of this application is to provide a saline-alkali water treatment aquaculture coupled with power generation process and control method to solve the problems mentioned in the background art.

[0012] To achieve the above objectives, this application provides the following technical solution: a saline-alkali water treatment aquaculture coupled power generation process and control method, comprising 1000 PP power generation tank units, each a cylindrical PP tank with a diameter of 5 meters and a height of 1.5 meters, serving as an independent microbial fuel cell reactor. Each tank contains 5-10 power generation pairs, each consisting of an anode assembly and a cathode assembly. The surface of the anode assembly is coated with microbial flora for treating saline-alkali water. The anode assembly is selected from one or more porous conductive materials chosen from graphite felt, carbon felt, and activated carbon fiber felt; the cathode assembly is selected from one or more chosen from graphite plate, titanium plate, and stainless steel mesh; the distance between the anode and cathode is 10-100 centimeters. All power generation pairs within the same tank are connected in series via wires to increase the output voltage of a single tank.

[0013] PP aquaculture tank unit: 1000 units in total, each a cylindrical PP tank with a diameter of 5 meters and a height of 1.5 meters, used for aquaculture. The inlet of each aquaculture tank unit is connected to the outlet of at least one of the PP power generation tank units via a pipe to receive water that has been treated by microorganisms.

[0014] Large-scale water storage / regulating pond: It covers an area of ​​100 mu (approximately 6.7 hectares) and has a water depth of 2.5 meters, serving as the terminal water body and regulation space of the system. Its inlet is connected to the outlet of the 1000 aquaculture tank units via a pipeline to collect aquaculture wastewater.

[0015] Domestic water production unit: Its inlet is connected to a saline-alkali water source for desalination treatment of raw water. It has two outlets: a freshwater outlet is connected to the large reservoir / water regulating tank and the domestic water pipeline network respectively, for supplementing freshwater and supplying domestic water; the concentrated brine outlet is connected to the inlet of the PP power generation unit, using high-salinity concentrated brine as the treatment feedstock for the power generation unit.

[0016] The graded hydraulic circulation system consists of water pumps, pipes, and valves. It is used to drive water to circulate along the path of "saline water source → domestic water production unit (concentrated brine) → PP power generation tank unit → PP aquaculture tank unit → large water storage tank / water regulating tank". It can also realize the backflow regulation from the water storage tank to the power generation tank or aquaculture tank.

[0017] Matrix power management system: Connects to multiple generator pairs within each PP generator unit. The system includes multiple combiner boxes and DC-DC boost modules; each combiner box is used to connect the outputs of 50-100 PP generator units in parallel; the DC-DC boost modules are used to uniformly boost the output voltage of each combiner box to a DC bus voltage of 48V or higher, to facilitate energy storage (connection to energy storage devices) and distribution.

[0018] Preferably, the domestic water production unit is a desalination device such as reverse osmosis (RO), electrodialysis (ED), or multi-effect evaporation (MED), specifically, it can be a device for preparing domestic water by desalinating underground saline water and seawater as described in application number 202610203083.7.

[0019] Preferably, the large water storage / regulating tank is equipped with a salinity sensor and a linkage controller. When the sensor detects that the salinity of the tank water exceeds 35‰, the controller instructs the domestic water production unit to add a portion of its produced freshwater into the storage tank for dilution, in order to maintain the salinity within a suitable range.

[0020] Preferably, the electrical energy generated by the matrix power management system is preferentially used to power the system's own loads, including aeration pumps, circulating water pumps, drive pumps of the domestic water production unit, and water pumps in the graded hydraulic circulation system within the aquaculture tank unit.

[0021] Secondly, the present invention provides a method for combining power generation and aquaculture using the above-mentioned system, comprising the following steps: S1. Deployment and acclimatization steps: Install multiple anode-cathode power generation pairs in 1000 PP power generation tank units, and inoculate the tanks with specific microbial communities that can adapt to high-salt environments and attach to the anodes for acclimatization and cultivation.

[0022] S2. Steps for constructing the hydraulic circulation path: a. The saline water source is connected to the domestic water production unit for desalination, and the resulting concentrated brine is connected to the inlet of the PP generator unit.

[0023] b. Connect the outlet of each PP power generation tank unit to the inlet of the corresponding PP aquaculture tank unit.

[0024] c. After collecting the water outlets of all the breeding tank units, connect them to a large water storage tank / water regulating tank.

[0025] d. The freshwater produced by the domestic water production unit is partly connected to the domestic water pipeline network and partly connected to a water storage tank as a supplementary water source.

[0026] S3. Steps for constructing a power harvesting network: a. Connect multiple generator pairs in series within each PP generator unit to increase the voltage of a single unit.

[0027] b. Connect the output terminals of every 50-100 PP generator units in parallel to a group combiner box.

[0028] c. After the output terminals of all the combiner boxes are boosted by a DC-DC boost module, they are connected to the DC bus and energy storage device to form a system power supply network.

[0029] S4. System Operation and Power Generation Steps: The staged hydraulic circulation system is activated, allowing high-salinity concentrated brine to flow sequentially through the PP power generation tank unit, the PP aquaculture tank unit, and the large storage / regulating tank. Inside the PP power generation tank unit, microbial communities attached to the anode metabolize organic matter or specific substances to generate electrons. Simultaneously, the salinity gradient (ion concentration difference) between the influent (high-salt) and effluent (low-salt) within the tank creates a potential difference between the anode and cathode. Electrons flow to the cathode through the external circuit, thus continuously outputting electrical energy.

[0030] S5. Salinity Dynamic Control Step: Salinity is monitored in real time by a salinity sensor installed in the water storage tank. When the salinity exceeds 35‰, the domestic water production unit automatically controls the addition of some of its produced freshwater to the water storage tank to dilute and stabilize the salinity within a suitable range of 25‰-35‰. This water can then be reused in aquaculture tanks or used for other agricultural purposes.

[0031] S6. Co-utilization of Heat: The metabolic processes of microorganisms within the PP power generation tank unit generate heat. This heat is carried into the PP aquaculture tank unit along with the treated water flow, helping to warm the aquaculture water during cold seasons and promoting the growth of aquatic organisms. Simultaneously, the large water storage / regulating tank, with its vast water volume and surface area, effectively absorbs, stores, or dissipates heat, balancing the overall system water temperature and reducing fluctuations.

[0032] Preferably, the salinity of the brine (concentrated brine) entering the PP power generation unit is 170‰-250‰. After microbial treatment and electrochemical action, the salinity of the effluent is reduced to 25‰-35‰, making it a suitable water body for aquaculture.

[0033] In summary, the technical effects and advantages of this invention are as follows: 1. Precise matching of large-scale parameters: The total processing capacity of 1,000 power generation tanks is matched with the water demand of 1,000 aquaculture tanks and the storage capacity of 100 mu of water storage ponds to form a golden ratio (total tank volume of 30,000 m³, pond volume of 167,000 m³, about 5.6 times), ensuring the long-term stable operation of the system.

[0034] 2. Standardized and rapid replication: The 5-meter diameter PP drum is a standard industrial product that can be mass-produced in the factory. On-site installation only requires hoisting and placement, connecting pipes and cables, which shortens the construction cycle by more than 70%. It is suitable for rapid promotion in multiple bases in Xinjiang and other places.

[0035] 3. Operation and maintenance friendly: When a single tank fails, the water and electrical circuits can be disconnected for repair or replacement without affecting the normal operation of the remaining 999 tanks and the entire system, greatly improving system availability.

[0036] 4. High-efficiency energy management: Through a three-level power architecture of "intra-tank series voltage boosting, inter-tank parallel current merging, and centralized voltage boosting and transmission", the line loss problem caused by low voltage and high current in large-scale systems is effectively solved, and the power utilization rate is improved.

[0037] 5. Dual Water Resource Guarantee: By using a dual approach of "microbial treatment of saline-alkali water for aquaculture + seawater desalination for domestic water", the dual needs of large-scale aquaculture bases for aquaculture and domestic water are met, preventing water shortages caused by fluctuations in raw water supply.

[0038] 6. Precise Salinity Control in Reservoirs: Freshwater produced by the domestic water production unit is used to control the salinity of reservoirs, effectively preventing salinity accumulation caused by evaporation and circulation, and ensuring the safe growth of aquaculture organisms.

[0039] 7. Cascade utilization of concentrated brine: The concentrated brine (with high salinity) discharged from the domestic water production unit is not directly discharged, but is used as raw water for the power generation tank. Its high salinity enhances the concentration difference for power generation, achieving synergistic efficiency between "water production and power generation".

[0040] 8. Energy self-sufficiency: The electricity generated by the power generation system directly drives the domestic water production unit and aquaculture oxygenation equipment, forming a positive feedback loop of "power generation driving water production and water production assisting power generation", which greatly reduces dependence on external energy.

[0041] 9. Heat Synergy: The heat generated by microbial metabolism enters the breeding tank with the water flow, which plays an auxiliary role in heat preservation in winter; the large water storage tank has a high heat capacity, which can balance the temperature difference between day and night, and control the water temperature fluctuation within ±2℃ throughout the year.

[0042] 10. High system integration: The system integrates ZL202411310326.4 (microbial treatment), this power generation system and seawater desalination to form a comprehensive solution that integrates water production, power generation, aquaculture and storage, filling the gap in existing technology. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic flowchart of a saline-alkali water treatment aquaculture coupled with power generation process and control method in an embodiment of this application. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In this document, the term "comprising" is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Example: Application in the large-scale saline-alkali water aquaculture base of Xinjiang Kezhou Zhanyu Biotechnology Co., Ltd. Scenario Setting: At Zhanyu Biotechnology Co., Ltd. in Kezhou, Xinjiang, a large-scale seafood farming base will be constructed using salt lake water and underground saline-alkali water. The base will be equipped with 1000 PP power generation tanks (Φ5m×1.5m), 1000 PP aquaculture tanks (Φ5m×1.5m), a 100-mu (approximately 6.7 hectares) water storage pond with a depth of 2.5m, and a domestic water production unit with a daily processing capacity of 100 tons (using technology from application number 202610203083.7).

[0048] Operation process: Tank Installation: Arrange 1000 power generation tanks and 1000 aquaculture tanks in an array, utilizing the terrain difference so that the outlet of the power generation tanks is slightly higher than the inlet of the aquaculture tanks to facilitate gravity flow. A main inlet pipe is installed at the bottom of the power generation tanks, and a main outlet pipe is installed at the top.

[0049] Electrode installation: Ten graphite felt pieces (each 2m×1m×10mm, total area 20㎡) are suspended inside each generator barrel as anodes, and ten graphite plates (each 2m×1m×10mm, total area 20㎡) are suspended as cathodes, with the anode and cathode spaced 30cm apart. The ten electrode pairs are connected in series inside the barrel using titanium wire to lead out the positive and negative terminals.

[0050] Microbial inoculation: A small amount of aquaculture pond bottom mud containing the active ZL202411310326.4 bacteria was introduced from the existing seafood base in Tatirang Town, Qiemo County and the seafood aquaculture base in Halajun Township, Kizilsu Kyrgyz Autonomous Prefecture as a biological substrate; then the activated ZL202411310326.4 bacteria were inoculated into each generator, and diluted saline-alkali water was circulated for acclimatization for 2 weeks until the voltage stabilized.

[0051] Hydraulic system construction: • Main path: saline water source pump → 1000 generator tanks (parallel water intake) → 1000 aquaculture tanks (1:1 correspondence) → collection → water storage tank.

[0052] • Water production path: saline-alkali water source pump → domestic water production unit → fresh water (to domestic water supply network + water replenishment to the storage tank), concentrated saline water (to the inlet of the generator tank).

[0053] Power system construction: Each group consists of 100 generator tanks, with the output terminals of each tank connected in parallel to the group combiner box (approximately 5V). Ten combiner boxes are each connected to a DC-DC boost module, uniformly boosting the voltage to a 48V DC bus. The bus connects to a 200kWh lithium iron phosphate battery pack, supplying power to the aeration pumps in the aquaculture tanks (50W pump per tank, total power 50kW) and the domestic water production unit (approximately 15kW).

[0054] Collaborative operation: The system is started, and the saline solution flows through each unit in sequence.

[0055] Running result: • Power generation: After stable operation, the output power of a single generator is about 8-12W, and the total power of 1000 generators is 8-12kW. The daily power generation is about 200-300kWh.

[0056] • Power supply: The generated electricity can meet the energy consumption of the domestic water production unit, as well as part of the energy consumption of the oxygenation pump.

[0057] • Water production: The domestic water production unit produces 100 tons of fresh water per day, of which 20 tons are added to the reservoir for salinity control and 80 tons are supplied to the base for domestic use.

[0058] • Salinity control: The salinity of the reservoir was kept stable in the range of 28‰-32‰, and there was no situation of salinity accumulation exceeding the standard.

[0059] • Utilization of concentrated brine: Application No. 202610203083.7 The concentrated brine (approximately 560‰) byproduct of the saline-alkali water and seawater desalination process enters the power generation tank and forms a greater concentration difference with the low-salt effluent, increasing the power generation capacity of a single tank by approximately 15%-20%.

[0060] • Treatment effect: After being treated by the generator tank, the salinity of the saline water was reduced to 28‰-32‰, and the COD, ammonia nitrogen and other indicators all met the requirements for aquaculture.

[0061] • Heat synergy: In winter, microbial metabolism raises the water temperature by 2-3°C compared to the inlet water, which then flows into the aquaculture tanks; in summer, the water storage tank absorbs heat at night and cools down during the day, keeping the annual water temperature fluctuation within ±2°C.

[0062] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process and control method for coupled power generation through saline-alkali water treatment for aquaculture, characterized in that: include: 1000 PP power generation tank units, each PP power generation tank unit is a cylindrical tank with a diameter of 5 meters and a height of 1.5 meters, serving as an independent microbial treatment container. Inside, there are multiple power generation pairs consisting of anode components and cathode components. The surface of the anode components is covered with microbial flora used for treating saline-alkali water. 1000 PP aquaculture tank units, each PP aquaculture tank unit is a cylindrical tank with a diameter of 5 meters and a height of 1.5 meters, used for aquaculture, and its water inlet is connected to the water outlet of at least one of the PP power generation tank units through a pipe; A large water storage / regulating pond, with an area of ​​100 mu and a water depth of 2.5 meters, has its inlet connected to the outlet of the 1,000 aquaculture tank units via a pipeline; The domestic water production unit has its inlet connected to a saline-alkali water source, its fresh water outlet connected to the large water storage / regulating tank and the domestic water pipeline network, and its concentrated brine outlet connected to the inlet of the PP power generation unit. A graded hydraulic circulation system is used to drive the water to circulate between the PP power generation tank unit, the aquaculture tank unit, the large water storage / regulation tank and the domestic water production unit; The matrix power management system is connected to multiple generator pairs in each PP generator unit. It is used to boost the voltage of each generator pair in series, connect multiple generator units in parallel to combine current, and then store and distribute electrical energy after unified voltage boosting.

2. The process and control method for coupled aquaculture and power generation in saline-alkali water treatment according to claim 1, characterized in that, The domestic water production unit is the apparatus for preparing domestic water using underground saline water and seawater desalination as described in application number 202610203083.

7.

3. The system according to claim 1, characterized in that, The large water storage / regulating tank is equipped with a salinity sensor. When the salinity exceeds 35‰, the system controls the domestic water production unit to add fresh water to the storage tank for dilution.

4. The process and control method for coupled aquaculture and power generation in saline-alkali water treatment according to claim 1, characterized in that, The PP generator unit is equipped with 5-10 generator pairs. Each generator pair consists of an anode component and a cathode component. All generator pairs in the same tank are connected in series by wires, so that the output voltage of a single tank is increased to 2-8V.

5. The process and control method for coupled aquaculture and power generation in saline-alkali water treatment according to claim 1, characterized in that, The anode assembly is a porous conductive material selected from one or more of graphite felt, carbon felt, and activated carbon fiber felt; the cathode assembly is selected from one or more of graphite plate, titanium plate, and stainless steel mesh; the distance between the anode assembly and the cathode assembly is 10-100 cm.

6. The process and control method for coupled aquaculture and power generation in saline-alkali water treatment according to claim 1, characterized in that, The matrix power management system includes: multiple combiner boxes, each of which connects the output terminals of 50-100 PP generator units in parallel; and a DC-DC boost module, which boosts the output voltage of each combiner box to a DC bus of 48V or higher.

7. A power generation process and control method utilizing any one of claims 1-6, characterized in that, Includes the following steps: Deployment steps: Install multiple anode-cathode power generation pairs in 1000 PP power generation barrel units with a diameter of 5 meters and a height of 1.5 meters, and inoculate them with microbial communities for domestication; Hydraulic construction steps: Connect the saline-alkali water source to the inlet of the 1000 PP power generation tank units, connect the outlet of each PP power generation tank unit to the inlet of the corresponding PP aquaculture tank unit, and then collect the outlets of the 1000 aquaculture tank units and connect them to the inlet of a 100-mu (6.7 hectares) water storage / regulating pond with a water depth of 2.5 meters; at the same time, connect the saline-alkali water source to the inlet of the domestic water production unit, connect its freshwater outlet to the water storage pond and the domestic water pipeline network respectively, and connect its concentrated brine outlet to the inlet of the PP power generation tank unit; Power construction steps: Connect multiple generator pairs in each PP generator unit in series, connect the output terminals of every 50-100 PP generator units in parallel to the group combiner box, and then connect the output terminals of all group combiner boxes to the DC bus and energy storage device through a DC-DC boost module. Operating steps: Start the graded hydraulic circulation system, so that the saline water flows sequentially through the PP power generation tank unit, the aquaculture tank unit, and the water storage / regulating tank; during this process, the microbial community in the PP power generation tank unit generates electrons through metabolism, and at the same time, an ion concentration gradient is formed between the high-salinity inlet water and the low-salinity outlet water in the tank. The two together generate a potential difference, which outputs electrical energy through the external circuit to power the aeration pump, circulating water pump, domestic water production unit, and water pumps in the graded hydraulic circulation system in the aquaculture tank unit.

8. The power generation process and control method according to claim 7, characterized in that, The salinity of the saline-alkali water is 170‰-250‰, and after being treated by the PP power generation tank unit, the salinity is reduced to 25‰-35‰.

9. The power generation process and control method according to claim 7, characterized in that, It also includes a salinity control step: the salinity of the water storage tank is monitored in real time by a salinity sensor. When the salinity exceeds 35‰, fresh water produced by the domestic water production unit is added to the water storage tank for dilution, so as to maintain the salinity in the range of 25‰-35‰.

10. The power generation process and control method according to claim 7, characterized in that, It also includes a heat coordination step: the heat generated by the metabolism of microorganisms in the PP power generation tank unit enters the aquaculture tank unit with the treated water flow to increase the temperature of the aquaculture water; the large water storage tank / water regulating tank uses its huge water volume and surface area to balance the water temperature fluctuations of the entire system.

Images