A sewage treatment comprehensive energy utilization system and method

Abstract

The present application belongs to the field of sewage treatment and resource recycling technology, and relates to a comprehensive energy utilization system and method for sewage treatment, which comprises a sewage treatment module outlet water area connected with a reclaimed water reuse module, the reclaimed water reuse module connected with a pumped storage module and a water source heat pump module respectively, a sewage treatment module outlet sludge area and kitchen garbage connected with a biogas cogeneration module through a sludge treatment module, the sludge treatment module further connected with a biogas purification device and a nutrient soil manufacturing device; the biogas cogeneration module connected with an electric power pipe network and a heat pipe network, the pumped storage module connected with the electric power pipe network, and the water source heat pump module connected with the heat pipe network. The present application combines sewage treatment with reclaimed water reuse, biogas cogeneration, nutrient soil manufacturing and other modules organically, fully excavates the potential value of sewage, sludge and kitchen garbage, realizes efficient utilization of resources, and avoids waste of resources in traditional treatment mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment and resource recovery, and particularly relates to a sewage treatment comprehensive energy utilization system and method. BACKGROUND

[0002] At present, the sewage treatment industry is undergoing profound changes as environmental protection policies continue to advance. The core goal of traditional sewage treatment plants is to treat pollutants in sewage to meet the standard discharge standard. However, with the increasing demand for efficient use of resources and environmental protection, the traditional sewage treatment mode has gradually shown many limitations and cannot meet the needs of sustainable development in the new era.

[0003] The traditional sewage treatment plant takes the standard discharge of pollutants as the only core goal, and this single-oriented operation mode brings many problems:

[0004] First, in the traditional treatment process, the treated effluent is usually directly discharged into natural water bodies, and the potential value of reclaimed water is not fully tapped. At the same time, the main disposal methods for sludge are landfill and incineration, which not only occupies a large amount of land resources, but also may cause secondary pollution. Moreover, the biogas and organic matter resources contained in the sludge are not effectively recovered and utilized, further aggravating the degree of resource waste.

[0005] Secondly, the traditional sewage treatment plant lacks energy self-sufficiency, and the aeration, pumping and other links in the sewage treatment process consume a large amount of electric energy, which accounts for more than 70% of the total energy consumption of the plant.

[0006] The existing sewage treatment technology mainly focuses on the single function of sewage purification, and cannot develop and utilize multiple resources such as water, energy and sludge. This single-function treatment mode makes it impossible for sewage treatment plants to achieve efficient use of resources and energy self-sufficiency, limiting their sustainable development capabilities.

[0007] In summary, the existing sewage treatment technology has been difficult to meet the requirements of environmental protection policies for efficient use of resources and low carbon emissions. Therefore, it is of great practical significance and urgency to develop a sewage treatment comprehensive energy utilization system and method that can realize the coordinated development of water, energy and sludge resources, improve energy self-sufficiency, reduce carbon emissions and achieve overall optimization. SUMMARY

[0008] In order to solve the above technical problems, the present application provides a sewage treatment comprehensive energy utilization system.

[0009] The technical scheme of the present application is realized by the following scheme: a sewage treatment comprehensive energy utilization system, comprising sewage, a sewage treatment module capable of decomposing sewage into treated water and sludge, a reclaimed water reuse module, a kitchen garbage conveying pipe and a sludge treatment module, the sewage treatment module water outlet area is connected with the reclaimed water reuse module, the reclaimed water reuse module is connected with a pumped storage module and a water source heat pump module respectively, the sewage treatment module sludge outlet area and kitchen garbage are connected with a biogas cogeneration module through the sludge treatment module, and the sludge treatment module is further connected with a biogas purification device and a nutrient soil manufacturing device;

[0010] The biogas cogeneration module is connected with an electric power pipe network and a heat pipe network, the pumped storage module is connected with an electric power pipe network, and the water source heat pump module is connected with a heat pipe network.

[0011] Preferably, the pumped storage module comprises a reclaimed water pipe network, a highland storage tank and a power station, the reclaimed water pipe network is connected with the highland storage tank through a water conveying pipe, the highland storage tank is connected with the power station through a water outlet pipe and a water return pipe, a first valve is arranged between the reclaimed water pipe network and the water conveying pipe, a third valve is arranged between the water outlet pipe and the power station, and a second valve is arranged between the water return pipe and the reclaimed water pipe network.

[0012] Preferably, the water outlet end of the power station and the water drainage end of the reclaimed water pipe network are both connected with a river.

[0013] Preferably, the reclaimed water reuse module comprises a first clean water pool, a second clean water pool, a third clean water pool and a water distribution pump house, the first clean water pool, the second clean water pool and the third clean water pool are all connected with a clean water pool water inlet channel through a water inlet gate, the first clean water pool, the second clean water pool and the third clean water pool are all connected with the water distribution pump house through a water outlet gate, the first clean water pool and the second clean water pool are both connected with the water source heat pump module through a heat pump water supply pipe, the water outlet end of the water source heat pump module is connected with the first clean water pool and the second clean water pool through a heat pump water return pipe, and the third clean water pool is connected with the water source heat pump module through a heat storage water supply pipe and a heat storage water return pipe respectively.

[0014] Preferably, a first thermometer and a first flowmeter are arranged on the heat pump water supply pipe, and a second thermometer and a second flowmeter are arranged on the heat pump water return pipe.

[0015] Preferably, a liquid level meter is arranged in each of the first clean water pool, the second clean water pool and the third clean water pool, and the clean water pool water inlet channel is connected with an overflow water return system through an overflow weir.

[0016] A utilization method of a sewage treatment comprehensive energy utilization system, comprising the following steps:

[0017] Step A: sewage is introduced into the sewage treatment module, which is reacted into treated water and sludge, and kitchen waste is directly connected to the sludge treatment module;

[0018] Step B: the treated water is introduced into the reclaimed water reuse module for regeneration treatment, and the sludge is introduced into the sludge treatment module for treatment together with the kitchen waste;

[0019] Step C: after treatment in the reclaimed water reuse module, the reclaimed water is introduced into the pumped storage module, the water source heat pump module and the miscellaneous water pipe network for energy utilization of the reclaimed water;

[0020] Step D: the sludge and kitchen waste are anaerobically fermented in the sludge treatment module to produce biogas, which is then integrated into the biogas cogeneration module and the natural gas pipe network for energy utilization of the biogas;

[0021] Step E: the digested sludge and kitchen waste are dewatered, dried and harmlessly treated in the nutrient soil manufacturing device to produce organic nutrient soil for landscaping or soil remediation.

[0022] As a preferred, the specific utilization steps of the reclaimed water energy in step C include;

[0023] C1, the treated water is treated in the reclaimed water reuse module, and after reaching the reclaimed water standard, it is divided into three parts for utilization of reclaimed water resources;

[0024] C2, a part is supplied to urban greening, road cleaning and other municipal miscellaneous uses through the miscellaneous water pipe network;

[0025] C3, a part is introduced into the water source heat pump module, combined with the water source heat pump, and the heat energy in the reclaimed water is extracted and connected to the heat pipe network for heating and refrigeration;

[0026] C4, a part is pumped and stored through the pumped storage module, and the reclaimed water is converted into a storage medium through high and low potential energy conversion, combined with the load demand of the power grid for water energy-electricity interactive regulation and control, and the generated electricity is connected to the power grid system to realize the cascade energy utilization of the reclaimed water.

[0027] As a preferred, in the step C4, the pumped storage module operates in a peak-shaving mode with low load during the day and high load at night, the low-load produced water in the reclaimed water plant is temporarily stored in the high-altitude storage tank during the day, and the high-load produced water is treated and transported to the pipe network through the water distribution pump house at night. Based on the high and low potential energy conversion, the water turbine set is driven to generate electricity, the generated electricity is connected to the grid based on the peak and valley demand regulation and control, and the cascade energy utilization of the reclaimed water potential energy-electricity conversion and peak-shaving energy storage power generation is realized.

[0028] As a preferred, the specific utilization steps of the biogas energy in step D include;

[0029] D1, the sludge and kitchen waste are introduced into the sludge treatment module;

[0030] D2, input anaerobic, cooperative anaerobic fermentation, improve biogas yield;

[0031] D3, biogas can be purified by biogas purification device and integrated into natural gas pipeline network;

[0032] D4, biogas can also drive biogas generator to realize cogeneration, and the waste heat of power generation is used to maintain the temperature of anaerobic digestion and heating and cooling of the plant area.

[0033] In summary, the present application has the following beneficial effects:

[0034] 1. The present application integrates various resource utilization technologies, organically combines sewage treatment, reclaimed water reuse, biogas cogeneration, nutrient soil manufacturing and other modules, and the treated reclaimed water can be used for municipal miscellaneous use, water source heat pump energy supply and pumped storage power generation; the biogas produced by the cooperative anaerobic fermentation of sludge and kitchen waste can be used for power generation, heating or integrated into natural gas pipeline network; the digested sludge and kitchen waste are processed into organic nutrient soil, which fully taps the potential value of sewage, sludge and kitchen waste, realizes efficient utilization of resources, and avoids waste of resources in traditional treatment mode.

[0035] 2. The pumped storage uses reclaimed water, which is converted into energy storage medium through high and low potential energy conversion, and the water energy and electric energy are interactively regulated according to the load demand of power grid, and the generated electric energy is integrated into the power grid system, realizing the cascade energy utilization of reclaimed water; on the other hand, the biogas produced by the cooperative anaerobic fermentation of sludge and kitchen waste can drive the biogas generator to realize cogeneration, and the waste heat of power generation is used to maintain the temperature of anaerobic digestion and heating and cooling of the plant area, which not only reduces the dependence on external electric energy and the energy consumption of sewage treatment plant, but also reduces the consumption of fossil energy and carbon emissions, which helps to achieve the goal of low carbon emission.

[0036] 3. The system adopts the treatment mode of cooperative anaerobic fermentation of sludge and kitchen waste, in the sludge treatment module, the sludge and kitchen waste are fermented in anaerobic environment, the produced biogas is purified to supply natural gas or generate power, and the waste heat of power generation can be used to maintain the temperature of anaerobic digestion and heating and cooling of the plant area, and the digested sludge and kitchen waste are dewatered, dried and harmlessly treated in the nutrient soil manufacturing device to produce organic nutrient soil for landscaping or soil remediation, which not only avoids the environmental problems caused by landfill and incineration, but also realizes the resource utilization of sludge, reduces environmental pollution, and meets the requirements of sustainable development.

[0037] 4. The system constructs a comprehensive energy utilization system taking sewage treatment as the core, synchronously outputting reclaimed water, electric energy, heat energy, cold energy and organic fertilizer, promotes the transformation of sewage treatment plants from 'energy consumption for pollution treatment' to 'energy production for energy supply', through the collaborative development and comprehensive utilization of multiple resources, the sewage treatment plant is no longer a simple pollution treatment place, but becomes an energy and resource producer, which not only improves the economic benefit of the sewage treatment plant, but also enhances its sustainable development ability. BRIEF DESCRIPTION OF DRAWINGS

[0038] Fig. 1 is a system schematic diagram of the present application;

[0039] Fig. 2 is a schematic diagram of the combined construction of reclaimed water reuse, water source heat pump utilization and pumped storage;

[0040] Fig. 3 is a schematic diagram of the reclaimed water reuse module system of the present application.

[0041] Reference signs are explained as follows: 1, sewage treatment module;

[0042] 2, reclaimed water reuse module; 21, first clean water tank; 22, second clean water tank; 23, third clean water tank; 24, water distribution pump house;

[0043] 3, pumped storage module; 31, reclaimed water pipe network; 32, high ground storage tank; 33, power station; 34, first valve; 35, second valve; 36, third valve;

[0044] 4, water source heat pump module;

[0045] 5, sludge treatment module;

[0046] 6, biogas cogeneration module. DETAILED DESCRIPTION

[0047] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application will be further described below in combination with the drawings and examples.

[0048] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the present application is not limited to the specific embodiments disclosed in the following description, the present application will be further described in detail below in combination with the drawings.

[0049] Example 1: A sewage treatment comprehensive energy utilization system, as shown in Figs. 1-3As shown, including sewage, sewage treatment module 1 can be decomposed into sewage treatment module 1, reclaimed water reuse module 2, kitchen waste conveying pipe and sludge treatment module 5, the effluent area of sewage treatment module 1 is connected with reclaimed water reuse module 2, reclaimed water reuse module 2 is connected with pumped storage module 3 and water source heat pump module 4 respectively, sludge area of sewage treatment module 1 and kitchen waste are connected with biogas cogeneration module 6 through sludge treatment module 5, sludge treatment module 5 is also connected with biogas purification device and nutrient soil manufacturing device, intelligent water inlet pump house is arranged at the front end of sewage treatment module 1, built-in electric regulating valve and flowmeter interlock, according to the difference of daytime / night load, dynamic adjustment of water inlet flow; The sludge-water separation unit is arranged in the module, the pneumatic butterfly valve and the sludge concentration sensor are installed on the sludge pipeline, and the sludge discharge mode is automatically opened, and the sludge is transported to the sludge treatment module 5;

[0050] The outlet of the reclaimed water reuse module 2 is provided with a water distributor, which is equipped with a three-way proportional regulating valve. The reclaimed water flow is distributed to passage one, passage two and passage three according to the set proportion through PLC control. Passage one is connected to the miscellaneous water pipe network through a check valve. Passage two enters the plate heat exchanger of the water source heat pump module 4 through a constant flow valve. Temperature difference regulating valves are installed at the inlet and outlet of the heat exchanger to control the heat extraction efficiency. Passage three is connected to the pumped storage module 3 through a hydraulic control slow closing check valve to prevent water hammer impact. The hydraulic control slow closing check valve is the first valve 34 arranged between the reclaimed water pipe network 31 and the water conveying pipeline.

[0051] The biogas cogeneration module 6 is connected with the power pipe network and the heat pipe network. The pumped storage module 3 is connected with the power pipe network. The water source heat pump module 4 is connected with the heat pipe network.

[0052] The sludge treatment module 5 cooperates with the biogas cogeneration and nutrient soil manufacturing device, adopts sludge concentration sensor and pneumatic butterfly valve interlock control, accurately discharges sludge and improves anaerobic fermentation efficiency, increases methane purity of biogas, improves cogeneration comprehensive efficiency, synchronously produces high value-added organic nutrient soil, and forms a "sludge-energy-nutrient soil" closed loop.

[0053] The water distributor and the three-way proportional regulating valve of the reclaimed water reuse module 2 dynamically distribute reclaimed water to the miscellaneous pipe network, the water source heat pump and the pumped storage module 3 according to the demand, so as to realize the reclaimed water reuse rate ≥80% and support multiple energy conversion scenes.

[0054] Pumped storage module 3 includes a reclaimed water pipeline network 31, a high-altitude storage tank 32, and a power station 33. The reclaimed water pipeline network 31 is connected to the high-altitude storage tank 32 via a water transmission pipeline. The high-altitude storage tank 32 is connected to the power station 33 and a return water pipeline via an outlet pipeline. A first valve 34 is installed between the reclaimed water pipeline network 31 and the water transmission pipeline. A third valve 36 is installed between the outlet pipeline and the power station 33. The return water pipeline is connected to the reclaimed water pipeline network 31. A second valve is installed between the return water pipeline and the reclaimed water pipeline network 31. Gate 35, pumped storage module 3 adopts a dual-mode switching design for daytime energy storage and nighttime power generation. During the daytime energy storage stage, the electric gate valve for the high-level water tank inlet (first valve 34) is opened, and the power generation branch shut-off valve (second valve 35 and third valve 36) is closed, and the reclaimed water is pressurized and stored. During the nighttime power generation stage, the first valve 34 is closed, and the second valve 35 and the pressure balancing valve (third valve 36) are opened. The high potential energy difference is used to drive the impulse turbine for power generation.

[0055] Both the outlet of the power plant 33 and the drainage of the reclaimed water pipeline 31 are connected to the river. The reclaimed water pipeline 31 connects the reclaimed water plant, high and low reservoirs, power plant 33, users, etc., to meet the needs of reclaimed water users in the basin and the water replenishment needs of the river. The water pressure required at its most unfavorable point is denoted as H2. The total loss from the high ground regulating reservoir 32 to the most unfavorable point is denoted as h. The water volume of the high ground regulating reservoir 32 can meet the storage of the total reclaimed water production for the whole day. The lowest liquid level is denoted as H1, where H1≥h+H2.

[0056] like Fig. 3 As shown, the reclaimed water reuse module 2 includes a first clear water tank 21, a second clear water tank 22, a third clear water tank 23, and a water distribution pump station 24. The first clear water tank 21, the second clear water tank 22, and the third clear water tank 23 are all connected to the clear water tank inlet channel through inlet gates. The first clear water tank 21, the second clear water tank 22, and the third clear water tank 23 are all connected to the water distribution pump station 24 through outlet gates. The first clear water tank 21 and the second clear water tank 22 are both connected to the water source heat pump module 4 through heat pump supply pipes. The outlet end of the water source heat pump module 4 is connected to the first clear water tank 21 and the second clear water tank 22 through heat pump return pipes. The third clear water tank 23 is connected to the water source heat pump module 4 through heat storage supply pipes and heat storage return pipes, respectively. Each of the three clear water tanks is equipped with an inlet gate, referred to as the first inlet gate, the second inlet gate, and the third inlet gate; the outlet gates are also designated as such. The water source heat pump module 4 is the heating station.

[0057] The first temperature meter and the first flow meter are arranged on the heat pump water supply pipe, the second temperature meter and the second flow meter are arranged on the heat pump water return pipe, the fourth valve and the sixth valve, the first flow meter (flow is recorded as q1) and the first temperature meter (temperature is recorded as t1) are arranged on the heat pump water supply pipe; the fifth valve and the seventh valve, the second flow meter (flow is recorded as q2) and the second temperature meter (temperature is recorded as t2) are arranged on the heat pump water return pipe; the eighth valve and the ninth valve are arranged on the heat storage water supply pipe and the water return pipe respectively; the heat provided for the heat pump system is recorded as Q, Q=C x p x q1 x (t1-t2).

[0058] The liquid level meters are arranged in the first clean water pool 21, the second clean water pool 22 and the third clean water pool 23, the clean water pool water inlet channel is connected with the overflow water return system through the overflow weir, and the water distribution pump house 24 is connected with the water suction well.

[0059] In the heating (cooling) season, the third clean water pool 23 is a heat storage water pool, and the volume of the third clean water pool 23 needs to be greater than W4, the first clean water pool 21 and the second clean water pool 22 are respectively municipal miscellaneous regenerated water storage and heat station regenerated water storage pools, and the volumes of the first clean water pool 21 and the second clean water pool 22 need to be greater than W2 and W3 respectively. If the first clean water pool 21 stores municipal water and the second clean water pool 22 stores heat pump water supply, the opening and closing conditions of the valves are as follows:

[0060] The first and third water inlet gates are closed, and the second water inlet gate is opened;

[0061] The first water outlet gate is opened, and the second and third water outlet gates are closed;

[0062] The fourth valve and the seventh valve are closed, and the fifth valve and the sixth valve are opened;

[0063] The eighth valve and the ninth valve are opened.

[0064] At this time, the regenerated water first enters the second clean water pool 22, so that the water supply of the heat pump system is sufficient; the heat pump return water enters the first clean water pool 21, so that the water supplement requirement of the first clean water pool 21 can be met, the municipal regenerated water is all taken from the first clean water pool 21, so that it can be ensured that the heat pump water supply will not take the heat pump system return water; and the third clean water pool 23 stores heat pump system heat water.

[0065] When the liquid level of the second clean water pool 22 reaches the maximum value, the first water inlet gate is opened, and the regenerated water can enter the first clean water pool 21 and the second clean water pool 22 at the same time. When the water level continues to rise, the overflow weir can be used to enter the overflow water return system and be discharged.

[0066] In the non-heating (cooling) season, when the first water inlet gate, the second water inlet gate and the third water inlet gate are opened, the first water outlet gate, the second water outlet gate and the third water outlet gate are opened, and the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve and the ninth valve are all closed, the clean water pools can be used for municipal regenerated water storage.

[0067] Each pool can be independently operated, so it can also be closed for maintenance according to the operation needs.

[0068] Embodiment 2: A method for utilizing a sewage treatment comprehensive energy utilization system, as shown in the figure, comprising the following steps: Figs. 1-3

[0069] Step A: sewage is introduced into the sewage treatment module 1, and it is reacted into treated water and sludge, while kitchen waste is directly connected to the sludge treatment module 5;

[0070] Step B: the treated water is introduced into the reclaimed water reuse module 2 for regeneration treatment, and the sludge is introduced into the sludge treatment module 5 for treatment together with the kitchen waste;

[0071] The kitchen waste is directly connected to the sludge treatment module 5 through a special conveying pipeline to avoid cross contamination, and is mixed with the sludge generated by the sewage treatment module 1 to form a co-digestion system with high organic matter content. The easily degradable characteristics of kitchen waste (containing oil, carbohydrates, etc.) and the microbial enrichment characteristics of sludge are complementary, which significantly improves the anaerobic fermentation gas production efficiency and provides stable fuel for subsequent cogeneration.

[0072] Step C: the reclaimed water after treatment is introduced into the pumped storage module 3, the water source heat pump module 4 and the miscellaneous water supply pipeline network for reclaimed water energy utilization;

[0073] C1, the treated water is treated by the reclaimed water reuse module 2, and after reaching the reclaimed water standard, it is divided into three parts for the utilization of reclaimed water resources;

[0074] Maximize the value of reclaimed water.

[0075] C2, a part of it is supplied to urban greening, road cleaning and other municipal miscellaneous uses through the miscellaneous water supply pipeline network;

[0076] The reclaimed water is directly connected to the urban greening, road cleaning and other low-quality water scenes through the check valve pressure stabilization, which relieves the municipal water supply pressure, reduces the demand for fresh water resources, and also reduces the water treatment cost of the city.

[0077] C3, a part of it is introduced into the water source heat pump module 4, combined with the water source heat pump, extracts the heat energy in the reclaimed water, and enters the heat pipe network for heating and refrigeration;

[0078] C4, a part of it is pumped through the pumped storage module 3, and through the conversion of high and low potential energy, the reclaimed water is converted into an energy storage medium, combined with the load demand of the power grid for water energy-electricity interactive regulation and control, and the generated electricity is connected to the power grid system to realize the cascade energy utilization of reclaimed water;

[0079] ​In this module, reclaimed water is used as an energy storage medium to store energy through high and low potential energy conversion. When the grid load is low, the pumped storage module 3 can use electric energy to pump water from low to high to store energy. When the grid load is high, it can generate electricity by releasing the high-stored water to meet the load demand of the grid.

[0080] Thermal-electric-water coupling energy supply, water source heat pump module 4 and biogas cogeneration module 6 form "heat network complementation"; pumped storage module 3 and biogas power generation participate in power peak shaving, improve the energy self-sufficiency rate of the whole plant, and the energy storage efficiency of pumped storage module 3 is effectively improved, which can replace coal-fired peak shaving units.

[0081] In step C4, the pumped storage module 3 adopts the peak-shifting mode of low load during the day and high load at night. The low-load water produced by the reclaimed water plant is temporarily stored in the high-altitude storage tank 32 during the day. At night, the high-load water is treated through the water distribution pump house 24 and sent to the pipe network. Based on the high and low potential energy conversion, the water turbine set is driven to generate electricity. The generated electricity is combined with the peak and valley demand regulation of the grid to realize the step energy utilization of reclaimed water potential energy-electricity conversion and peak-shifting energy storage power generation.

[0082] The volume of the high-altitude storage tank 32 can be the maximum daily water volume. The water volume that cannot be accommodated by the reclaimed water pipe network 31 can be used for pumped hydroelectric power generation. The minimum liquid level of the tank can meet the pressure demand of the most unfavorable point of the reclaimed water pipe network 31. In addition to the reclaimed water pipe network 31, the high-altitude storage tank 32 and the power station 33, the pumped storage module 3 also includes a pre-plant storage tank, a clear water tank and a water distribution pump house 24, and adopts the peak-shifting mode of low load during the day and high load at night.

[0083] The pre-plant storage tank is used to store peak sewage during the day. The clear water tank is used to store reclaimed water produced by the reclaimed water plant during the day. The water distribution pump house 24 does not run during the day and runs entirely at night to improve the capacity to meet the total flow throughout the day. The power plant has the ability to use all the water for hydroelectric power generation and is connected to the municipal power grid.

[0084] The reclaimed water plant runs at low load during the day, and the excess sewage is temporarily stored in the pre-plant storage tank. The produced reclaimed water is temporarily stored in the clear water tank. At night, the reclaimed water plant runs at high load to treat all the water and the sewage in the storage tank. The produced reclaimed water and the reclaimed water stored during the day are all sent to the water distribution pipe network by the water distribution pump house 24. The water distribution pipe network is entirely supplied by the high-altitude storage tank 32 during the day. At night, it is supplied by the water distribution pump house 24, and the excess reclaimed water is stored in the high-altitude storage tank 32. The high-altitude storage tank 32 stores reclaimed water at night and supplies water to the water distribution pipe network during the day. The excess reclaimed water enters the power station 33 to supply power to the municipal power grid, achieving the purpose of peak-shifting energy storage power generation.

[0085] Step D: sludge and kitchen waste are anaerobically fermented in the sludge treatment module 5 to produce biogas, which is then integrated into the biogas cogeneration module 6 and the natural gas pipeline for biogas energy utilization;

[0086] The specific utilization steps of the biogas energy in step D include:

[0087] D1, sludge and kitchen waste are introduced into the sludge treatment module 5;

[0088] In this module, the sludge and kitchen waste are mixed evenly to prepare for the subsequent anaerobic fermentation process.

[0089] D2, input anaerobic, and perform fermentation in cooperation with anaerobic fermentation to improve biogas yield;

[0090] Through the action of anaerobic microorganisms, organic matter is decomposed into biogas and other biological substances, and the anaerobic fermentation process can improve the yield of biogas, because different components in the sludge and kitchen waste can complement each other and promote the activity of microorganisms.

[0091] D3, the biogas can be purified by a biogas purification device and integrated into the natural gas pipeline;

[0092] The generated biogas can be purified by a biogas purification device to remove impurities and carbon dioxide and improve the purity of methane; the purified biogas can be integrated into the natural gas pipeline for utilization as clean energy.

[0093] D4, the biogas can also drive a biogas generator to realize cogeneration, and the waste heat from power generation can be used to maintain the anaerobic digestion temperature and provide heating and cooling for the plant area.

[0094] Step E: the digested sludge and kitchen waste are dewatered, dried, and harmlessly treated by a nutrient soil manufacturing device to produce organic nutrient soil for landscaping or soil remediation.

[0095] The mixture of sludge and kitchen waste after anaerobic fermentation needs to be dewatered to remove water, and the dewatered material is further dried to reduce its volume and weight for subsequent treatment and transportation. During the drying process, harmless treatment can also be performed to ensure the safety and environmental protection of the final product, and organic nutrient soil is produced.

[0096] The biogas energy drives the sludge treatment module 5 to run, and the nutrient soil feeds back to ecological remediation, forming a zero waste mode of "waste treatment with waste and energy-fertilizer circulation"; completely solving the problems of high disposal cost and high secondary pollution risk of sludge and kitchen waste.

[0097] The parts and devices use conventional models in existing technology, and the circuit connection uses conventional connection methods in existing technology, which will not be described in detail here. The contents not described in detail in this specification belong to the existing technology known to those skilled in the art.

[0098] The above merely describes preferred embodiments of the present application, but is not intended to limit the present application in other forms. Any person skilled in the art can make changes or modifications to the above disclosed technical contents into equivalent embodiments with equivalent changes, and apply to other fields. However, any simple modification or equivalent change made to the above embodiments without departing from the technical solution of the present application, and according to the technical essence of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. A sewage treatment integrated energy utilization system, characterized in that: The sewage treatment module (1) includes sewage, sewage decomposition module (1) into the treated water and sludge, reclaimed water reuse module (2), kitchen waste conveying pipe and sludge treatment module (5), the sewage treatment module (1) outlet area is communicated with the reclaimed water reuse module (2), the reclaimed water reuse module (2) is respectively communicated with the pumped storage module (3) and the water source heat pump module (4), the sewage treatment module (1) outlet area and kitchen waste are communicated with the biogas cogeneration module (6) through the sludge treatment module (5), the sludge treatment module (5) is also connected with the biogas purification device and the nutrient soil manufacturing device; The biogas cogeneration module (6) is connected with the power pipe network and the heat pipe network, the pumped storage module (3) is connected with the power pipe network, and the water source heat pump module (4) is connected with the heat pipe network; The pumped storage module (3) includes a reclaimed water pipe network (31), a high ground regulating reservoir (32) and a power station (33), the reclaimed water pipe network (31) is communicated with the high ground regulating reservoir (32) through a water conveying pipeline, the high ground regulating reservoir (32) is communicated with the power station (33) through a water outlet pipeline and a water return pipeline, a first valve (34) is arranged between the reclaimed water pipe network (31) and the water conveying pipeline, a third valve (36) is arranged between the water outlet pipeline and the power station (33), the water return pipeline is communicated with the reclaimed water pipe network (31), and a second valve (35) is arranged between the water return pipeline and the reclaimed water pipe network (31); The reclaimed water reuse module (2) includes a first clear water pool (21), a second clear water pool (22), a third clear water pool (23) and a water distribution pump house (24), the first clear water pool (21), the second clear water pool (22) and the third clear water pool (23) are communicated with a clear water pool inlet channel through water inlet gates, the first clear water pool (21), the second clear water pool (22) and the third clear water pool (23) are communicated with the water distribution pump house (24) through water outlet gates, the first clear water pool (21) and the second clear water pool (22) are communicated with the water source heat pump module (4) through heat pump water supply pipes, and the water outlet end of the water source heat pump module (4) is communicated with the first clear water pool (21) and the second clear water pool (22) through heat pump water return pipes. Fourth valves and sixth valves are arranged on the heat pump water supply pipes, fifth valves and seventh valves are arranged on the heat pump water return pipes, and eighth valves and ninth valves are arranged on the heat storage water supply pipes and the heat storage water return pipes.

2. The sewage treatment and comprehensive energy utilization system according to claim 1, characterized in that: The water outlet end of the power station (33) and the water outlet end of the reclaimed water pipe network (31) are connected with a river.

3. The sewage treatment and comprehensive energy utilization system according to claim 2, characterized in that: First temperature meters and first flow meters are arranged on the heat pump water supply pipes, and second temperature meters and second flow meters are arranged on the heat pump water return pipes.

4. The sewage treatment and comprehensive energy utilization system according to claim 3, characterized in that: Liquid level meters are arranged in the first clear water pool (21), the second clear water pool (22) and the third clear water pool (23), and the clear water pool inlet channel is communicated with an overflow water return system through an overflow weir.

5. A method for utilizing a sewage treatment integrated energy utilization system, characterized by, The sewage treatment comprehensive energy utilization system of claim 2 is used for energy utilization, including the following steps: Step A: sewage is introduced into the sewage treatment module (1) and reacted into treated water and sludge, while kitchen waste is directly connected to the sludge treatment module (5); Step B: the treated water is introduced into the reclaimed water reuse module (2) for regeneration treatment, while the sludge is introduced into the sludge treatment module (5) for combined treatment with kitchen waste; Step C: the treated water from the reclaimed water reuse module (2) is introduced into the pumped storage module (3), the water source heat pump module (4) and the miscellaneous water pipe network for reclaimed water energy utilization; Step D: the sludge and kitchen waste are subjected to anaerobic fermentation in the sludge treatment module (5) to produce biogas, which is then introduced into the biogas cogeneration module (6) and the natural gas pipe network for biogas energy utilization; Step E: the digested sludge and kitchen waste are dewatered, dried and harmlessly treated in the organic nutrient soil manufacturing device to produce organic nutrient soil for landscaping or soil remediation.

6. The method of claim 5, wherein the method further comprises: The specific utilization steps of the reclaimed water energy in Step C include: ​ C1, the treated water is treated by the reclaimed water reuse module (2), and after reaching the reclaimed water standard, it is divided into three parts for reclaimed water resource utilization; C2, a part is supplied to urban landscaping, road cleaning and municipal miscellaneous use through the miscellaneous water pipe network; C3, a part is introduced into the water source heat pump module (4) to extract heat energy from the reclaimed water in combination with the water source heat pump, and is introduced into the heat pipe network for heating and refrigeration; C4, a part is introduced into the pumped storage module (3) for pumped storage, and through high and low potential energy conversion, the reclaimed water is converted into energy storage medium, and the water energy-electricity interactive regulation is carried out according to the load demand of the power grid, and the generated electricity is connected to the power grid system to realize the cascade energy utilization of the reclaimed water.

7. The method of claim 6, wherein the method further comprises: In the step C4, the pumped storage module (3) adopts the peak-shaving mode of low load operation during the day and high load operation at night, and the low load water produced by the reclaimed water plant is temporarily stored in the high ground storage tank (32) during the day, and the high load water is pumped and transported to the pipe network through the water distribution pump house (24) at night, and the water turbine set is driven based on the high and low potential energy conversion to generate electricity, and the generated electricity is connected to the grid according to the peak and valley demand regulation to realize the cascade energy utilization of the reclaimed water potential energy-electricity conversion and peak-shaving energy storage power generation. ​ 8. The method of claim 7, wherein the method further comprises: The specific utilization steps of the biogas energy in Step D include: ​ D1, the sludge and kitchen waste are introduced into the sludge treatment module (5); D2, input anaerobic fermentation to improve the biogas yield; D3, the biogas can be purified by a biogas purification device and introduced into the natural gas pipe network; D4, the biogas can also drive a biogas generator to realize cogeneration, and the waste heat generated by the generator is used to maintain the anaerobic digestion temperature and provide heating and cooling for the plant.

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