Harmless treatment method for sewage and dirt of septic tank

Abstract

The invention relates to the technical field of environmental engineering, and discloses a septic tank sewage and dirt innocent treatment method which comprises the following steps: S1, retaining and warning a construction area of a septic tank; s2, a constructor wears anti-static clothes and a gas mask, opens a manhole cover of the septic tank and detects harmful gas in the septic tank; s3, an exhaust fan and an air feeder are mounted at a wellhead of the septic tank, and harmful gas in the septic tank is discharged; s4, pumping sewage and sludge in the septic tank by using a sewage treatment vehicle; and S5, carrying out solid-liquid separation on the sewage and the solid dirt, pressing out solid sludge through sewage treatment equipment, and enabling the sewage to enter a precision filter. Sewage and sludge in the septic tank are subjected to solid-liquid separation, and are filtered by the sewage treatment equipment, so that the treated water quality reaches the standard that town sewage is discharged into a drainage pipe network, the pollution of the sewage to the environment is effectively reduced, the behaviors of stealthily discharging and disorderly discharging of a sewage tank truck are avoided, and the secondary pollution of the sludge and waste is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of environmental engineering, and in particular to a method for harmlessly treating sewage from a septic tank. Background Art

[0002] Septic tank is a widely used primary feces treatment facility. It is mainly used to intercept and precipitate suspended pollutants such as feces, silt, and paper towels in sewage through the principles of sedimentation and anaerobic fermentation. While initially purifying sewage, it can partially digest organic matter and kill parasite eggs and intestinal pathogens. The feces (including digested sludge, sediment and scum) accumulated at the bottom of the septic tank contains a large amount of organic pollutants and pathogens, and contains non-degradable solid impurities. If the feces are discharged into the environment without harmless treatment, it will bring a series of environmental and health problems:

[0003] Untreated fecal residue will damage environmental hygiene and the city's image, and pollute the air, water and soil, causing foul air odors and attracting pests, further causing water pollution and river siltation;

[0004] Feces contain pathogens, which can easily breed mosquitoes, flies and other harmful organisms, and become the source of disease transmission, threatening human health and public health safety;

[0005] Fecal residue contains difficult-to-degrade debris such as sanitary napkins, fabrics, glass, and plastic. If the septic tank cannot be cleaned in time, the debris will clog the sewage pipes, affecting the normal operation of the urban drainage system, and the accumulation of methane will pose a safety hazard.

[0006] Therefore, those skilled in the art provide a method for harmlessly treating septic tank sewage to solve the problems raised in the above-mentioned background technology. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a method for harmlessly treating sewage from a septic tank to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above objectives, the present invention is implemented through the following technical scheme: a method for harmless treatment of septic tank sewage, comprising the following steps:

[0009] S1. Fence and guard the construction area of ​​the septic tank;

[0010] S2. Construction workers wear anti-static clothing and gas masks, open the manhole cover of the septic tank, and detect harmful gases inside the septic tank;

[0011] S3. Install exhaust fans and blowers at the wellhead of the septic tank to discharge harmful gases in the septic tank;

[0012] S4. Use sewage treatment vehicles to extract sewage and sludge from septic tanks;

[0013] S5, separate the sewage and solid dirt into solid-liquid separation, press out the solid sludge through the sewage treatment equipment, and the sewage enters the precision filter;

[0014] S6. Add the pre-prepared flocculating agent into the sewage, and mix and stir;

[0015] S7, the sewage after flocculation enters the filter press, and the floccules are filtered;

[0016] S8. After the treated sewage meets the standards for urban sewage discharge into the drainage network, it is discharged into the urban municipal sewage network;

[0017] S9. The solid waste and sludge generated by the treatment are placed in bags marked with garbage labels and transported to power plants for incineration or landfills for disposal;

[0018] S10. In hospitals, biological laboratories or during disease transmission, use ultraviolet disinfection devices to kill bacteria, germs and molds in septic tanks.

[0019] Preferably, in step S6, the addition ratio of the flocculating agent is calculated according to the following formula:

[0020] P=C 污水 ×R,

[0021] Where P is the total amount of flocculation agent added, C 污水 is the suspended solids concentration in the sewage, and R is the preset flocculant addition ratio.

[0022] Preferably, in step S6, the flocculating agent is a mixture of cationic polyacrylamide and polyaluminium chloride, wherein the concentration range of the cationic polyacrylamide is 0.05% to 0.1%, and the concentration range of the polyaluminium chloride is 1% to 2%.

[0023] Preferably, in step S6, the stirring speed of the mixing and stirring process is in the range of 100 r / min to 150 r / min, and the stirring time is in the range of 5 min to 10 min.

[0024] Preferably, in step S7, the filtration pressure range of the filtration process is 0.3 MPa to 0.5 MPa, and the filtration time range is 15 min to 30 min.

[0025] Preferably, in the solid-liquid separation process in step S5, the water content of the solid sludge is reduced to 50% to 75% by a sludge compression device, and the sludge compression device is a screw press or a plate and frame filter press. The solid sludge generated by the sludge compression device during the filtration process can be used for composting or resource utilization in a biomass power plant.

[0026] Preferably, in step S5, after the solid-liquid separation process, the suspended matter concentration of the sewage is lower than 50 mg / L, and the sludge water content is controlled within a range of 50% to 60%.

[0027] Preferably, the filtration accuracy range of the precision filter in the sewage treatment vehicle is 5 microns to 10 microns, and the extraction efficiency of the sewage treatment vehicle is 10m 3 / h-20m 3 / h, and the sludge treatment capacity is 2t / h~5t / h.

[0028] Preferably, the ultraviolet disinfection intensity interval in step S10 is 200 μW / cm 2 ~400μW / cm 2 The disinfection time range is 5min to 15min.

[0029] Preferably, in step S9, the solid waste generated by the treatment is packed in closed bags and the entire transportation process is monitored to prevent secondary contamination.

[0030] The present invention provides a method for harmlessly treating sewage from a septic tank, which has the following beneficial effects:

[0031] 1. The present invention separates the sewage and sludge in the septic tank into solid-liquid separation and uses sewage treatment equipment to filter, ensuring that the treated water quality meets the standards for urban sewage to be discharged into the drainage network, effectively reducing sewage pollution to the environment, avoiding the illegal discharge of sewage tankers, and preventing secondary pollution of sludge and waste.

[0032] 2. The present invention uses ultraviolet disinfection equipment to effectively kill pathogens, bacteria, and viruses in septic tanks, prevent the spread of pathogens in special environments such as hospitals and biological laboratories, and ensure public health safety.

[0033] 3. The present invention standardizes the cleaning and treatment process of septic tanks through a systematic harmless treatment construction plan, prevents the blockage of septic tanks and sewage pipes, ensures the normal operation of urban drainage systems, and reduces the safety hazards caused by biogas accumulation.

[0034] 4. After compression, the wastewater can be further used for incineration in power plants or landfill treatment to achieve resource utilization. In addition, the sewage treatment equipment is powered by electricity to avoid carbon dioxide emissions generated in traditional transportation.

[0035] 5. The present invention avoids the breeding of flies, mosquitoes and other vectors by timely cleaning and processing of septic tank waste, further reduces the risk of disease transmission and improves the sanitary conditions of the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0037] In order to make the technical personnel in the technical field understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in combination with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a partial embodiment of the present invention, not a complete embodiment. Based on the embodiment of the present invention, other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present invention.

[0038] The present invention is described in detail below in conjunction with the accompanying drawings:

[0039] Example:

[0040] Please refer to the attached Figure 1 , an embodiment of the present invention provides a method for harmless treatment of sewage from a septic tank, comprising the following steps: S1, fencing and guarding the construction area of ​​the septic tank;

[0041] S2. Construction workers wear anti-static clothing and gas masks, open the manhole cover of the septic tank, and detect harmful gases inside the septic tank;

[0042] S3. Install exhaust fans and blowers at the wellhead of the septic tank to discharge harmful gases in the septic tank;

[0043] S4. Use sewage treatment vehicles to extract sewage and sludge from septic tanks;

[0044] S5, separate the sewage and solid dirt into solid-liquid separation, press out the solid sludge through the sewage treatment equipment, and the sewage enters the precision filter;

[0045] S6. Add the pre-prepared flocculating agent into the sewage, and mix and stir;

[0046] S7, the sewage after flocculation enters the filter press, and the floccules are filtered;

[0047] S8. After the treated sewage meets the standards for urban sewage discharge into the drainage network, it is discharged into the urban municipal sewage network;

[0048] S9. The solid waste and sludge generated by the treatment are placed in bags marked with garbage labels and transported to power plants for incineration or landfills for disposal;

[0049] S10. In hospitals, biological laboratories or during disease transmission, use ultraviolet disinfection devices to kill bacteria, germs and molds in septic tanks.

[0050] S1 benefit: through fencing and warning measures, the site is effectively isolated to avoid gas leakage or sewage overflow and pollution to the surrounding environment; S2 benefit: the detection of harmful gases can identify potential risks early and prevent dangers such as poisoning or explosion; S3 benefit: reduce gas concentration, ensure the safety of air circulation and construction environment, and avoid the risk of personnel poisoning or gas explosion; S4 benefit: it can effectively reduce the accumulation time of sludge and sewage in septic tanks and avoid environmental pollution caused by overflow of septic tanks; S5 benefit: it reduces the burden of subsequent treatment. Compression post-treatment is convenient for subsequent disposal or resource utilization; S6 benefit: the stirring process accelerates the full mixing of reagents and sewage, significantly improves the efficiency and effect of sewage treatment, and makes sewage purification more thorough; S7 benefit: reduce sludge volume and water content, which is convenient for subsequent sludge disposal. At the same time, the sewage after filtration is cleaner and conducive to meeting emission standards; S8 benefit: it meets the requirements of environmental protection regulations and ensures the health of the water environment; S9 benefit: it realizes resource utilization, while landfill treatment can safely and environmentally friendly treat non-combustible residues; S10 benefit: it avoids the spread of diseases and ensures public health safety.

[0051] In step S6, the addition ratio of the flocculating agent is calculated as follows:

[0052] P=C 污水 ×R,

[0053] Where P is the total amount of flocculation agent added, C 污水 is the suspended solids concentration in the sewage, and R is the preset flocculant addition ratio.

[0054] By using the suspended matter concentration and addition ratio in the sewage for calculation, the amount of flocculant used can be accurately calculated according to the actual situation of the sewage to avoid overdosage or underdosage. A reasonable flocculant ratio can accelerate the aggregation of suspended particles in the sewage to form larger flocs, which is convenient for subsequent solid-liquid separation and filter press treatment. At the same time, by setting a fixed calculation formula, the processing process can be automated to avoid errors caused by human operation, making the sewage treatment process more efficient and controllable.

[0055] By accurately calculating the amount of flocculant added, waste of agents can be avoided, operating costs can be reduced, and the chemical load on the sewage system can be reduced. The right amount of flocculant ensures the rapid aggregation of suspended matter, and the solid-liquid separation is more thorough. The sewage purification effect is significantly improved, and the effluent quality is better. If the proportion of added agents is properly controlled, there will not be too many chemical substances left in the sewage, reducing the risk of secondary pollution to the environment and meeting environmental protection requirements. At the same time, the formula can adjust the agent ratio according to the suspended matter concentration in the sewage and the specific situation. It has good adaptability, can cope with different sewage load conditions, and improve the overall treatment efficiency.

[0056] In step S6, the flocculating agent is a mixture of cationic polyacrylamide and polyaluminium chloride, wherein the concentration range of the cationic polyacrylamide is 0.05% to 0.1%, and the concentration range of the polyaluminium chloride is 1% to 2%.

[0057] Cationic polyacrylamide has strong adsorption and bridging effects, which can cause negatively charged suspended particles in sewage to aggregate and form flocs, making it easier to separate solid particles. Cationic polyacrylamide helps improve the efficiency of sludge dehydration during the filter press process, reduces the water content of sludge, and facilitates subsequent treatment and disposal of sludge.

[0058] Polyaluminium chloride can quickly neutralize the negative charge on the surface of colloidal particles in sewage, reduce the repulsive force between each other, make the particles easier to condense into flocs, and accelerate the sedimentation of suspended matter in sewage, improve sedimentation and separation effects, and improve the overall efficiency of sewage treatment;

[0059] The combined use of cationic polyacrylamide and polyaluminium chloride can significantly improve the flocculation effect. Cationic polyacrylamide adsorbs suspended solids through its molecular chain, and polyaluminium chloride compresses the double electric layer through electrical neutralization, so that the suspended particles in the sewage can be condensed faster and more effectively, further improving the flocculation efficiency. Under the action of the mixed agent, the suspended solids quickly form flocs, reducing the time of sedimentation and solid-liquid separation, and accelerating the sewage treatment process. At the same time, since the combined use of the two can significantly enhance the treatment effect, the use of a single agent can be reduced while ensuring the treatment effect, and the treatment cost can be reduced. In the solid-liquid separation process, cationic polyacrylamide effectively promotes sludge dehydration, reduces the sludge moisture content to 50% to 75%, reduces the sludge volume, and reduces transportation and disposal costs. Therefore, the agent formula ensures that the suspended solids and organic matter in the sewage can be effectively removed, and the effluent water quality meets or exceeds the discharge standard to avoid water pollution.

[0060] In step S6, the stirring speed of the mixing and stirring process is in the range of 100 r / min to 150 r / min, and the stirring time is in the range of 5 min to 10 min.

[0061] Appropriate stirring speed can ensure that the flocculating agent is in full contact with the suspended particles in the sewage, accelerate the flocculation reaction, and promote the aggregation of particles into flocs. If the stirring speed is high, the formed flocs will be destroyed, which will affect the effect of solid-liquid separation. Setting the stirring speed range between 100r / min and 150r / min can ensure the stable formation of flocs and avoid their destruction in subsequent steps. The stirring time of 5min to 10min ensures that the agent has enough contact time with the sewage, ensuring the full progress of the flocculation reaction, while avoiding excessive reaction or energy waste caused by too long stirring.

[0062] Through reasonable stirring speed and time, the suspended matter in the sewage can react with the flocculant quickly and effectively, shortening the treatment process time, which helps to improve the efficiency of the sewage treatment system. The appropriate stirring speed avoids excessive shear damage of the flocculants, and the flocculants formed are larger and more stable, making the subsequent solid-liquid separation easier and the removal rate of suspended matter in the sewage higher. By setting a reasonable stirring time range, unnecessary long stirring can be avoided while ensuring complete reaction, reducing the energy consumption of equipment and improving economic benefits. Appropriate stirring conditions ensure that the agent can fully play its role, which can more effectively remove suspended matter and pollutants in sewage, significantly improve the effluent quality, and ensure that sewage discharge meets environmental protection standards.

[0063] In step S7, the filtration pressure range of the filtration process is 0.3 MPa to 0.5 MPa, and the filtration time range is 15 min to 30 min.

[0064] By controlling the pressure at 0.3MPa~0.5MPa, the filter press can effectively squeeze out the water in the sludge and reduce the water content of the sludge, which is convenient for subsequent treatment and transportation. The appropriate pressure range can effectively improve the effect of solid-liquid separation, further condense the solid particles, squeeze out the liquid, ensure a more thorough solid-liquid separation, and reduce sewage backflow or secondary pollution in subsequent treatment. The filtration time of 15min~30min can ensure that there is enough time to separate the water from the sludge, while preventing excessive filtration from increasing energy consumption or excessive filtration, ensuring the efficient filtration process. By controlling the pressure in the range of 0.3MPa~0.5MPa, it can avoid damage to the filter press equipment caused by excessive pressure, and ensure that the equipment can operate for a long time under reasonable conditions, extending the service life of the equipment.

[0065] Reasonable pressure and time settings can maximize the compression of sludge, reduce the volume of sludge, and reduce the cost of transportation and final disposal. At the same time, the moisture content of the sludge after filtration is reduced and the volume is reduced, which is convenient for subsequent landfill or incineration treatment. The appropriate filtration pressure can ensure that the water in the sludge is fully squeezed out, effectively reducing the moisture content to 50%~75%, and greatly improving the dehydration effect, making the subsequent treatment of the sludge more convenient and reducing the difficulty of treatment. The filtration is completed within a time range of 15min~30min to ensure the thoroughness of solid-liquid separation, which can avoid energy waste caused by too long operation, making the treatment efficiency higher and the process more economical. Through efficient solid-liquid separation, suspended matter, impurities, and silt in the sewage are effectively removed, and the discharged liquid meets the urban sewage discharge standards, which helps to improve the overall effluent quality. Through appropriate filtration pressure and time control, it can effectively reduce energy consumption and reduce operating costs, especially under the premise of not affecting the sludge dehydration effect, reduce unnecessary energy waste and improve the economic benefits of the system.

[0066] In the solid-liquid separation process in step S5, the water content of the solid sludge is reduced to 50% to 75% by a sludge compression device, and the sludge compression device is a screw press or a plate and frame filter press. The solid sludge generated by the sludge compression device during the filtration process can be used for composting or resource utilization in a biomass power plant.

[0067] Through the solid-liquid separation treatment of the screw stack or plate-frame filter press, the water content of the sludge is reduced to 50%-75%, which greatly reduces the volume of the sludge and facilitates subsequent transportation, storage and treatment. The design of the screw stack and plate-frame filter press can efficiently remove the moisture in the sludge to form a drier solid sludge, improving the operability and stability in the subsequent treatment process. After filtration, the solid sludge contains a large amount of organic matter and nutrients, which is suitable for composting or as a raw material for biomass power generation, reducing the difficulty of waste treatment and converting it into a renewable resource. The solid sludge after sludge compression can be composted or used for power generation, reducing the impact of direct landfill or incineration on the environment, realizing the recycling of resources, and meeting the needs of modern environmental protection and sustainable development;

[0068] After the moisture content is reduced to 50% to 75%, the volume of sludge is greatly reduced, significantly reducing the cost of transportation and disposal. At the same time, drier sludge is easier to load and carry, reducing the difficulty of logistics and storage. The compressed solid sludge can be used for composting or biomass power plants to form an efficient resource recycling model. The organic matter and nutrients in the sludge help improve the soil, or be used as a raw material for biomass power generation, reducing dependence on non-renewable energy and achieving economic benefits. Through resource utilization, secondary pollution caused by sludge landfill or incineration can be avoided. Compost is used as an organic fertilizer in agricultural production to reduce the use of chemical fertilizers. Sludge power generation, as a clean energy, reduces carbon emissions from traditional energy and helps protect the environment. Compared with traditional landfill or incineration, the resource utilization of sludge significantly reduces the direct cost of sludge disposal. After the sludge is converted into compost or biomass fuel, the cost of garbage disposal is reduced, which can create additional economic value.

[0069] In step S5, after the solid-liquid separation process, the suspended matter concentration of the sewage is lower than 50 mg / L, and the sludge water content is controlled within a range of 50% to 60%.

[0070] Through the solid-liquid separation process, the suspended particles in the sewage are effectively removed and their concentration is reduced to below 50mg / L, making the sewage cleaner and meeting the discharge standards, which is convenient for subsequent further treatment or direct discharge. The water content of the sludge is controlled between 50% and 60%, indicating that the sludge has been fully dehydrated. Its water content range can ensure that the sludge has sufficient solid properties, which is convenient for subsequent treatment and resource utilization. Solid-liquid separation reduces the content of pollutants and suspended matter in the sewage, which meets the relevant environmental emission standards and avoids the risk of pollution to the water environment. Controlling the sludge water content in the range of 50% to 60% can ensure that the sludge has sufficient dryness, which is convenient for transportation, treatment and resource utilization, and ensures that the sludge treatment equipment will not reduce efficiency due to excessive dryness or excessive wetness;

[0071] The reduction of suspended solids concentration to below 50 mg / L means that some solid particles, silt and other substances are effectively removed, which significantly improves the effluent quality. After sewage treatment, it can be safely discharged into the municipal pipe network, reducing the burden on the environment. The significant reduction in the content of suspended solids in sewage can reduce the burden of subsequent treatment links and reduce the maintenance frequency and operating costs of treatment equipment. Sludge with a water content controlled at 50% to 60% has better stacking and operability, is more stable during transportation, and is convenient for subsequent resource utilization, such as composting, landfill or use as biomass fuel. At the same time, since the sludge is not easy to be too wet or too dry, the energy consumption and equipment wear during the treatment process will be reduced. The sludge with a lower water content has a smaller volume and an increased density, which reduces the cost of transportation and disposal, especially in long-distance transportation and large-scale treatment processes, which can significantly reduce related costs.

[0072] The filtration accuracy of the precision filter in the sewage treatment vehicle is between 5 microns and 10 microns, and the extraction efficiency of the sewage treatment vehicle is 10m 3 / h-20m 3 / h, and the sludge treatment capacity is 2t / h~5t / h.

[0073] This filtration accuracy can effectively remove tiny particles and suspended solids in sewage, ensuring the purification effect of sewage, especially for particles smaller than 10 microns, which can further reduce the content of solid matter in sewage and improve the quality of effluent. The extraction efficiency reflects the working speed of the sewage treatment vehicle, and each hourly treatment of 10m 3 ~20m 3 Sewage means that the equipment can efficiently complete the extraction and treatment of sewage in a short time, ensuring the rapid operation of the sewage treatment process and adapting to the needs of large-scale sewage treatment. Sludge treatment capacity means that the treatment vehicle can efficiently treat the sludge in the septic tank, treating 2 to 5 tons of sludge per hour, indicating that the treatment equipment can quickly cope with the task of treating a large amount of sludge, significantly shorten the time for sludge cleaning, and ensure the efficiency of sludge dehydration and compression;

[0074] The filtration accuracy of the precision filter is between 5 microns and 10 microns, which can remove extremely fine suspended matter and particles, ensuring that the sewage reaches a higher purification standard after multiple treatments, meets the urban sewage discharge standards, and reduces the risk of pollution to downstream drainage systems and water bodies. The efficient extraction capacity of the sewage treatment vehicle ensures that a large amount of sewage can be treated in a short time, especially when treating septic tanks or other large sewage sources. The operation can be completed quickly to avoid environmental pollution and public health problems caused by sewage accumulation. The sludge treatment capacity of 2t / h~5t / h means that a large amount of sludge can be treated every hour, which is particularly suitable for scenes with high sludge loads and efficient sludge treatment capacity. It can reduce sludge backlog, prevent equipment blockage or untimely treatment, and improve the efficiency of the overall sludge treatment system. The high-precision filtration of precision filters can effectively reduce the content of suspended solids and particulate matter, reduce the entry of solid matter into downstream water bodies, and prevent secondary pollution of water bodies. At the same time, efficient sludge treatment and extraction efficiency also reduce the odor and health risks caused by sludge exposure to the air during the treatment process. Efficient sewage extraction and sludge treatment speed means that sewage and waste treatment operations can be completed in a shorter time, reducing the time occupied by manpower and equipment, and greatly reducing operating costs, especially for high-frequency and large-volume treatment tasks.

[0075] The UV disinfection intensity range in step S10 is 200 μW / cm 2 ~400μW / cm 2 The disinfection time range is 5min to 15min.

[0076] Ultraviolet rays within this intensity range can effectively destroy the DNA and RNA structure of microorganisms, kill bacteria, viruses, molds and other pathogenic microorganisms, especially common pathogens and bacteria in septic tank sewage, such as Escherichia coli and Salmonella, to prevent the spread of pathogens through sewage. The disinfection time is controlled between 5 and 15 minutes to ensure sufficient ultraviolet irradiation time, so that microorganisms are exposed to ultraviolet rays and completely killed, avoiding incomplete disinfection due to insufficient irradiation time. At the same time, the time should not be too long to avoid energy waste or overheating of the equipment.

[0077] By setting the UV intensity range, UV rays can effectively kill various bacteria and viruses in septic tank sewage, especially in hospitals, biological laboratories or during disease transmission, which can greatly reduce the risk of infectious diseases spreading through sewage and ensure public health safety. 200μW / cm 2 ~400μW / cm 2 The ultraviolet intensity can effectively kill a variety of microorganisms including bacteria, viruses, fungi and parasites. It is suitable for treating sewage with different degrees of pollution, and is especially suitable for disinfection needs in highly polluted places. The disinfection time is between 5 minutes and 15 minutes, which can ensure that the microorganisms in the sewage have enough time to be exposed to ultraviolet rays for thorough disinfection. At the same time, appropriate time control can ensure efficient disinfection and avoid long-term disinfection leading to increased equipment energy consumption or excessive sterilization affecting the water ecology. Ultraviolet disinfection does not rely on chemical agents, so no chemical residues or by-products are produced, avoiding secondary pollution problems caused by chemical disinfection, especially in septic tank treatment. Pollution-free disinfection methods can significantly improve the environmental friendliness of sewage treatment. Ultraviolet disinfection, as a physical disinfection method, will not have adverse effects on the environment and human health, especially in special occasions. Ultraviolet disinfection avoids the harm of chemical disinfection to the surrounding environment and personnel, and is safer.

[0078] In step S9, the solid waste generated by the treatment is packed in closed bags and the entire transportation process is monitored to prevent secondary contamination.

[0079] Sealing the solid waste generated by the treatment in bags can effectively prevent the escape of harmful substances, foul-smelling gases and pathogens in the waste, and prevent the solid waste from coming into contact with the external environment during transportation and storage, ensuring safety and cleanliness during transportation. By monitoring the entire transportation process, the transportation status can be understood in real time, ensuring that the treatment and transportation of solid waste are in compliance with regulations, preventing illegal dumping or accidental leakage, and ensuring that the waste arrives safely at the designated disposal site;

[0080] Closed bagging effectively isolates solid waste from the outside world, prevents harmful substances in the waste from leaking into the environment, and avoids the emission of foul odors or pathogen-containing particles during transportation and loading and unloading to pollute the air and water, protecting environmental hygiene. Pathogens, bacteria and harmful substances contained in solid waste will not spread at will in the case of closed bagging, especially in the septic tank treatment process. The treatment method can greatly reduce the public health risks caused by garbage overflow or contact with the environment, and protect the health of surrounding residents. Closed bagging can ensure the stability of solid waste during transportation, prevent garbage from being spilled or leaked due to accidents or improper operation, and reduce the risk of secondary pollution caused by leakage. Through full-process monitoring, the transportation route and treatment of garbage can be tracked in real time to ensure that the garbage is safely and legally transported to power plants or landfills, eliminate illegal dumping and discharge, and ensure the transparency and legality of the garbage treatment process. The combination of closed bagging and monitoring prevents pollution and improves transportation and treatment efficiency. Full-process monitoring can promptly detect and deal with problems that arise during transportation to ensure that garbage is safely handled in the shortest time.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for harmlessly treating sewage from a septic tank, It is characterized in that The steps include: S1. Fence and guard the construction area of ​​the septic tank; S2. Construction workers wear anti-static clothing and gas masks, open the manhole cover of the septic tank, and detect harmful gases inside the septic tank; S3. Install exhaust fans and blowers at the wellhead of the septic tank to discharge harmful gases in the septic tank; S4. Use sewage treatment vehicles to extract sewage and sludge from septic tanks; S5, separate the sewage and solid dirt into solid-liquid separation, press out the solid sludge through the sewage treatment equipment, and the sewage enters the precision filter; S6. Add the pre-prepared flocculating agent into the sewage, and mix and stir; S7, the sewage after flocculation enters the filter press, and the floccules are filtered; S8. After the treated sewage meets the standards for urban sewage discharge into the drainage network, it is discharged into the urban municipal sewage network; S9. The solid waste and sludge generated by the treatment are placed in bags marked with garbage labels and transported to power plants for incineration or landfills for disposal; S10. In hospitals, biological laboratories or during disease transmission, use ultraviolet disinfection devices to kill bacteria, germs and molds in septic tanks.

2. A method for harmlessly treating septic tank sewage according to claim 1, It is characterized in that In step S6, the addition ratio of the flocculating agent is calculated according to the following formula: P=C 污水 ×R, Where P is the total amount of flocculation agent added, C 污水 is the suspended solids concentration in the sewage, and R is the preset flocculant addition ratio.

3. A method for harmlessly treating septic tank sewage according to claim 1, It is characterized in that In step S6, the flocculating agent is a mixture of cationic polyacrylamide and polyaluminium chloride, wherein the concentration range of the cationic polyacrylamide is 0.05% to 0.1%, and the concentration range of the polyaluminium chloride is 1% to 2%.

4. A method for harmlessly treating septic tank sewage according to claim 1, It is characterized in that In the step S6, the stirring speed of the mixing and stirring process is in the range of 100 r / min to 150 r / min, and the stirring time is in the range of 5 min to 10 min.

5. A method for harmlessly treating septic tank sewage according to claim 1, It is characterized in that In the step S7, the filtration pressure range of the filtration process is 0.3 MPa to 0.5 MPa, and the filtration time range is 15 min to 30 min.

6. A method for harmlessly treating septic tank sewage according to claim 1, It is characterized in that In the solid-liquid separation process in step S5, the water content of the solid sludge is reduced to 50% to 75% by a sludge compression device. The sludge compression device is a screw press or a plate and frame filter press. The solid sludge generated by the sludge compression device during the filtration process can be used for composting or resource utilization in a biomass power plant.

7. A method for harmlessly treating septic tank sewage according to claim 1, It is characterized in that In the step S5, after the solid-liquid separation process, the suspended matter concentration of the sewage is lower than 50 mg / L, and the sludge water content is controlled within a range of 50% to 60%.

8. A method for harmlessly treating septic tank sewage according to claim 1, It is characterized in that The filtration accuracy of the precision filter in the sewage treatment vehicle is between 5 microns and 10 microns, and the extraction efficiency of the sewage treatment vehicle is 10m 3 / h-20m 3 / h, and the sludge treatment capacity is 2t / h~5t / h.

9. A method for harmlessly treating septic tank sewage according to claim 1, It is characterized in that The ultraviolet disinfection intensity interval in step S10 is 200 μW / cm 2 ~400μW / cm 2 The disinfection time range is 5min to 15min.

10. A method for harmlessly treating septic tank sewage according to claim 1, It is characterized in that In step S9, the solid waste generated by the treatment is packed in closed bags and the entire transportation process is monitored to prevent secondary contamination.

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