Daily chemical wastewater treatment system

Abstract

The utility model relates to the technical field of water treatment, and discloses a daily chemical wastewater treatment system. The daily chemical wastewater treatment system comprises a primary filtering system, a biochemical treatment system, a chemical disinfection device, a middle filtering system and a reverse osmosis system which are connected in sequence along the water flow direction, the primary filtering system comprises a self-cleaning filter; the middle filtering system comprises a bag type filter and an activated carbon filter which are connected in sequence. The daily chemical wastewater treatment system provided by the utility model is suitable for deeply treating effluent of a daily chemical wastewater sewage station, pollutants such as organic matters, chlorides and total dissolved solids in water can be effectively removed, microorganisms such as bacteria can be killed, the hardness, turbidity and conductivity of a water body can be reduced, and the treated effluent can be used for production; water resources are saved, the production cost is saved, and environmental pollution is reduced; the treatment system is easy to operate, high in safety, high in practicability and suitable for application and popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a daily chemical wastewater treatment system. Background Art

[0002] The high market demand and production volume for daily chemical products have led to an increase in wastewater discharge from these products. This wastewater contains surfactants, fatty acids, additives, inorganic salts, fragrances, and other substances. It has a complex composition, high organic content, poor biodegradability, and fluctuating water quality, making it difficult to treat.

[0003] Treatment methods for daily chemical wastewater include coagulation, electrochemical methods, electron beam methods, traditional anaerobic aerobic biochemical methods, rotary contact oxidation, ozone oxidation, activated carbon treatment, and membrane treatment. One or more of these methods are generally combined to improve wastewater treatment rates. After treatment using one or more of these methods, major pollutants such as anionic surfactants and petroleum products are largely removed from the effluent from daily chemical wastewater treatment plants. The effluent can be used for non-production purposes such as air conditioning cooling circulating water, landscaping water, and toilet flushing. However, due to the high levels of pollutants such as organic matter, chlorides, and total dissolved solids in the water, as well as the presence of a large number of microorganisms, the total bacterial count and total coliform count exceed the standards, and the effluent from daily chemical wastewater treatment plants does not yet meet the standards for reused water for production purposes. Therefore, providing a deep treatment system for the effluent from daily chemical wastewater treatment plants that allows the treated effluent to be directly reused as workshop production water is of great significance for conserving water resources, reducing production costs, and alleviating environmental pollution. Utility Model Content

[0004] The present invention aims to solve at least one of the aforementioned technical problems existing in the prior art. To this end, the present invention provides a daily chemical wastewater treatment system. This daily chemical wastewater treatment system is used for deep treatment of effluent from daily chemical wastewater treatment plants. It can deeply remove organic matter, chlorides, total dissolved solids, bacteria, and other microorganisms from the wastewater, reduce water hardness, turbidity, and conductivity, and ensure that the treated effluent meets the standards for recycled water for production use, allowing it to be directly used in production.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model provides a daily chemical wastewater treatment system, which includes a primary filtration system, a biochemical treatment system, a chemical disinfection device, an intermediate filtration system and a reverse osmosis system connected in sequence along the water flow direction;

[0007] The primary filtration system includes a self-cleaning filter;

[0008] The intermediate filtration system includes a bag filter and an activated carbon filter connected in sequence.

[0009] Preferably, the treatment system further comprises a first intermediate water tank and a second intermediate water tank connected in sequence; the second intermediate water tank is connected to the self-cleaning filter.

[0010] Specifically, the first intermediate water tank and the second intermediate water tank are used to store effluent from the daily chemical wastewater treatment plant; the volume of the second intermediate water tank is 15-25 times that of the first intermediate water tank.

[0011] Preferably, the first intermediate water tank includes a first water tank, a first water pump and a liquid level controller.

[0012] Preferably, the second intermediate water tank includes a second water tank, a second water pump, a liquid level controller and a water meter.

[0013] Specifically, the first water pump is used to pump water out of the first intermediate water tank into the second intermediate water tank; the second water pump is used to pump water out of the second intermediate water tank into the self-cleaning filter device; the lift of the first water pump is 2-3 times that of the second water pump.

[0014] Preferably, the filtration accuracy of the self-cleaning filter is 80-100 μm; further preferably, the filtration accuracy of the self-cleaning filter is 50-100 μm.

[0015] Preferably, the biochemical treatment system includes an aerated biological filter; the aerated biological filter is filled with fillers.

[0016] Preferably, the biological aerated filter further includes an aeration system, a water distribution system, a backwash device and an external air source.

[0017] Preferably, the treatment system further comprises a backwash water tank; the backwash water tank is connected to the primary filtration system and the biochemical treatment system respectively; the backwash water tank is also connected to the regulating tank.

[0018] Specifically, the backwash water of the biochemical treatment system and the sewage of the primary filtration system flow into the backwash water tank by gravity.

[0019] Preferably, the treatment system further comprises a third intermediate water tank; the third intermediate water tank is connected to the biochemical treatment system and the intermediate filtration system respectively.

[0020] Preferably, the third intermediate water tank includes a third water tank, a third water pump and a liquid level controller.

[0021] Specifically, the third water pump is used for backflow from the third intermediate water tank to the biological aeration filter, and for pumping wastewater from the third water tank to the intercepting filter device.

[0022] Preferably, the chemical disinfection device includes a dosing pump and a dosing tank.

[0023] In some specific embodiments of the present invention, the chemical dosing device adds at least one chemical disinfectant selected from sodium hypochlorite and chlorine dioxide.

[0024] Preferably, the filtration accuracy of the bag filter is 30-50 μm; further preferably, the filtration accuracy of the bag filter is 10-50 μm.

[0025] Preferably, the reverse osmosis system comprises a security filter and a membrane assembly connected in sequence.

[0026] Preferably, the filtration accuracy of the security filter is 3-5 μm; further preferably, the filtration accuracy of the security filter is 1-5 μm.

[0027] Preferably, the reverse osmosis system further includes a conductivity meter, an ORP meter, a pH meter and a flow meter.

[0028] Preferably, a fourth intermediate water tank is provided between the intermediate filtration system and the reverse osmosis system; the fourth intermediate water tank is also connected to the discharge tank.

[0029] Preferably, the fourth intermediate water tank includes a fourth water tank, a fourth water pump and a liquid level controller.

[0030] Specifically, the fourth water pump is used to pump the water out of the fourth intermediate water tank into the deep filtration device of the reverse osmosis system.

[0031] Preferably, the membrane module comprises a spiral wound membrane element.

[0032] Preferably, the reverse osmosis system further comprises a cleaning device; the cleaning device is connected to the membrane assembly.

[0033] Preferably, the cleaning device includes a cleaning water tank and a cleaning agent dosing device.

[0034] Preferably, the cleaning agent dosing equipment includes a dosing pump and a dosing tank.

[0035] Preferably, a physical disinfection device is provided on the pipeline connecting the membrane module.

[0036] Preferably, the physical disinfection device includes an ultraviolet sterilizer.

[0037] Preferably, the reverse osmosis system is connected to a concentrated water discharge tank.

[0038] The basic principle of this utility model is described as follows:

[0039] 1) The utility model adopts a multi-stage filtration method including a self-cleaning filter, a bag filter, an activated carbon filter, and a security filter in the reverse osmosis system. The filter devices at each level respectively play the role of filtering out large particles of impurities, filtering out small particles, adsorbing organic matter, protecting the reverse osmosis membrane, and removing dissolved solids and trace pollutants at the same time. The synergistic effect of the multi-stage filter devices can reduce the use of chemical agents, deeply remove pollutants, and improve water quality.

[0040] 2) The utility model adopts a chemical disinfection device to kill various types of microorganisms such as bacteria, spores, viruses, fungi, etc., and sets a physical disinfection device on the connecting pipes of the reverse osmosis system membrane components to further kill microorganisms in the water, reduce pipeline pollution, ensure stable operation of the equipment, and improve the water quality of the outlet.

[0041] The beneficial effects of the utility model are:

[0042] 1) The daily chemical wastewater treatment system provided by the utility model first removes large particle impurities through a primary filtration system, then further biodegrades organic matter and ammonia nitrogen through a biochemical treatment system, filters out suspended impurities, removes tiny particles and adsorbs organic matter through an intermediate filtration system, and finally uses a reverse osmosis system for deep desalination and filtration to remove dissolved solids and trace pollutants in the water. At the same time, a disinfection device kills microorganisms, so that pollutants such as organic matter, chlorides, and total dissolved solids in the water can be deeply removed, bacteria and other microorganisms are killed, and the hardness, turbidity and conductivity of the water are reduced.

[0043] 2) The daily chemical wastewater treatment system provided by the utility model is suitable for the deep treatment of the effluent from daily chemical wastewater and sewage stations. The treated effluent can be used for production, which is beneficial to saving water resources, saving production costs and reducing environmental pollution.

[0044] 3) The daily chemical wastewater treatment system provided by the utility model is simple to operate, highly safe, highly practical, and suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic diagram of the daily chemical wastewater treatment system of the utility model;

[0046] Figure 2 This is a schematic diagram of a daily chemical wastewater treatment system according to an embodiment of the present invention, wherein 1-first intermediate water tank, 2-second intermediate water tank, 3-self-cleaning filter, 4-aerated biological filter, 5-third intermediate water tank, 6-bag filter, 7-activated carbon filter, 8-fourth intermediate water tank, 9-ultraviolet sterilizer, 10-security filter, 11-membrane assembly, 12-backwash water tank, 13-cleaning device, 14-blower, 15-concentrated water discharge tank, 16-regulating tank, and 17-discharge tank. DETAILED DESCRIPTION

[0047] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0048] The present invention is further described in detail below through specific embodiments.

[0049] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0050] Unless otherwise specified, the raw materials, reagents, or devices used in the examples can be obtained from conventional commercial sources or by existing methods. Unless otherwise specified, the experiments or testing methods are conventional methods in the art.

[0051] Figure 1 This is a schematic diagram of the daily chemical wastewater treatment system of the utility model. Figure 1 It can be seen that the daily chemical wastewater treatment system of the present invention includes a primary filtration system, a biochemical treatment system, a chemical disinfection device, an intermediate filtration system and a reverse osmosis system which are connected in sequence.

[0052] Figure 2 This is a schematic diagram of a daily chemical wastewater treatment system according to an embodiment of the present utility model. Figure 2 It can be seen that the daily chemical wastewater treatment system in the embodiment includes a first intermediate water tank 1, a second intermediate water tank 2, a self-cleaning filter 3, an aerated biological filter 4, a third intermediate water tank 5, a bag filter 6, an activated carbon filter 7, a fourth intermediate water tank 8 and a reverse osmosis system connected in sequence. The reverse osmosis system includes a security filter 10 and a membrane assembly 11 connected in sequence. A UV sterilizer 9 is provided on the pipeline in front of the membrane assembly 11. The reverse osmosis system also includes a membrane cleaning device 13 for removing membrane dirt. The membrane cleaning device includes a membrane cleaning water tank and a cleaning agent dosing device; the treatment system also includes a backwash water tank 12, and a regulating tank 16 is provided behind the backwash water tank. The backwash water tank is respectively connected to the self-cleaning filter 3 and the aerated biological filter 4, and the aerated biological filter 4 is connected to a blower 14 as an external air source; a discharge tank 17 is provided between the fourth intermediate water tank 8 and the UV sterilizer 9; in the water discharged from the treatment system, fresh water can be directly reused, and concentrated water enters the concentrated water discharge tank 15.

[0053] In the specific embodiment of the present invention, the filler in the aerated biological filter is ceramsite with a particle size of 3-5 mm and a specific surface area of ​​100-400 m 2 / m 3 The membrane component of the reverse osmosis system is a spiral membrane element with an effective membrane area of ​​35-40m 2 , water production is 40-45m 3 / d; the reverse osmosis system also includes an ORP meter, pH meter, flow meter and conductivity meter for online monitoring of water redox potential, pH, conductivity, inlet flow and product flow; the cleaning agent dosing equipment in the membrane cleaning device adds reducing agent and scale inhibitor.

[0054] The following will be combined Figure 2 The daily chemical wastewater treatment system of the present utility model is described as follows:

[0055] Table 1 shows the main equipment and specifications of the daily chemical wastewater treatment system in the embodiment:

[0056] Table 1 Main equipment and specifications in the daily chemical wastewater treatment system of embodiment

[0057]

[0058]

[0059] Table 2 is the test method and standard of water quality index of daily chemical wastewater for reference in the examples:

[0060] Table 2 Testing methods and standards for water quality indicators of daily chemical wastewater

[0061]

[0062]

[0063]

[0064] Table 3 Water quality test results of raw water (sewage station effluent) treated in the embodiment

[0065]

[0066] Table 3 shows the water quality test results of the raw water (sewage station effluent) treated in the examples. This daily chemical wastewater is mainly the production wastewater of daily chemical products such as laundry detergent, hand soap, and dishwashing liquid, which is initially treated at the sewage station and then discharged from the sedimentation tank. As can be seen from Table 3, after the daily chemical wastewater undergoes a series of preliminary treatments in the sewage station, including flotation tanks, hydrolysis and acidification tanks, oxidation tanks, and sedimentation, typical pollutants such as COD, anionic synthetic detergents, ammonia nitrogen, and petroleum have been effectively removed. However, the content of pollutants such as organic matter, chloride, and total dissolved solids in the water is still high, the total bacterial count and total coliform group exceed the standard, and the water body has high hardness, high turbidity, and high conductivity.

[0067] Example 1

[0068] This embodiment uses a daily chemical wastewater treatment system to treat the effluent from the daily chemical wastewater treatment station with water quality parameters such as those in Table 3. The treated water volume is 10m 3 / h:

[0069] 1) The effluent from the daily chemical wastewater treatment station flows by gravity into the first intermediate water tank. The first water pump is installed in the tank, and the wastewater is pumped into the second intermediate water tank by the first water pump. The wastewater in the second intermediate water tank is pumped into the self-cleaning filter by the second water pump to remove large particles such as suspended matter. The sewage from the self-cleaning filter flows by gravity into the backwash water tank, and the backwash water tank is connected to the regulating tank;

[0070] 2) The effluent from the self-cleaning filter flows by gravity into the biological aeration filter, which is filled with ceramsite. The biochemical reaction and adsorption filtration are used to remove suspended solids, organic matter and ammonia nitrogen. The backwash water from the biological aeration filter flows by gravity into the backwash water tank.

[0071] 3) The effluent from the biological aerated filter flows by gravity into the third intermediate water tank. The effluent from the third intermediate water tank is disinfected by adding sodium hypochlorite in a chemical disinfection device to kill various types of microorganisms such as bacteria, spores, viruses, and fungi. The effluent passes through a bag filter to remove suspended solids, particulate matter and other impurities in the wastewater. The effluent then passes through an activated carbon filter to remove residual chlorine generated by the sodium hypochlorite disinfection and organic matter in the wastewater through the activated carbon adsorption effect.

[0072] 4) The effluent from the activated carbon filter flows into the fourth intermediate water tank by gravity. The effluent from the fourth intermediate water tank is pumped into the reverse osmosis system by the fourth water pump and is processed in sequence by the UV sterilizer, the security filter and the membrane assembly. During operation, the acid and alkali cleaning liquids are input from the cleaning water tank to avoid membrane pollution and blockage. The reducing agent and scale inhibitor are then added by the dosing device. Fresh water (6.5m 3 / h) and concentrated water (3.5m 3 / h), and the fresh water production rate is 65%.

[0073] Example 2

[0074] This embodiment uses a daily chemical wastewater treatment system to treat the effluent from the daily chemical wastewater treatment station with water quality parameters such as those in Table 3. The treated water volume is 10m 3 / h:

[0075] 1) The effluent from the daily chemical wastewater treatment station flows by gravity into the first intermediate water tank. The first water pump is installed in the tank, and the wastewater is pumped into the second intermediate water tank by the first water pump. The wastewater in the second intermediate water tank is pumped into the self-cleaning filter by the second water pump to remove large particles such as suspended matter. The sewage from the self-cleaning filter flows by gravity into the backwash water tank, and the backwash water tank is connected to the regulating tank;

[0076] 2) The effluent from the self-cleaning filter flows by gravity into the biological aeration filter, which is filled with ceramsite. The biochemical reaction and adsorption filtration are used to remove suspended solids, organic matter and ammonia nitrogen. The backwash water from the biological aeration filter flows by gravity into the backwash water tank.

[0077] 3) The effluent from the biological aerated filter flows by gravity into the third intermediate water tank. The effluent from the third intermediate water tank is disinfected by adding sodium hypochlorite in a chemical disinfection device to kill various types of microorganisms such as bacteria, spores, viruses, and fungi. The effluent passes through a bag filter to remove suspended solids, particulate matter and other impurities in the wastewater. The effluent then passes through an activated carbon filter to remove residual chlorine generated by the sodium hypochlorite disinfection and organic matter in the wastewater through the activated carbon adsorption effect.

[0078] 4) The effluent from the activated carbon filter flows into the fourth intermediate water tank by gravity. The effluent from the fourth intermediate water tank is pumped into the reverse osmosis system by the fourth water pump and is processed in sequence by the UV sterilizer, the security filter and the membrane assembly. During operation, the acid and alkali cleaning liquids are input from the cleaning water tank to avoid membrane pollution and blockage. The reducing agent and scale inhibitor are then added by the dosing device. Fresh water (6.5m 3 / h) and concentrated water (3.5m 3 / h), and the fresh water production rate is 65%.

[0079] The fresh water obtained by the treatment in Examples 1 and 2 was tested for water quality. The test methods and standards are shown in Table 2. The test results are shown in Table 4 below. At the same time, the water quality indicators of the recycled water meet the requirements of the "Limits of Drinking Water Quality Indexes in Suzhou (2021)", the "Water Quality of Industrial Water for Urban Wastewater Recycling" in GB / T 19923, and the BOD / COD index requirements of Class I surface water in GB3838-2002 Surface Water Environmental Quality Standard. The conductivity is less than 100 μs / cm, as shown in Table 5.

[0080] Table 4 Water quality test results of fresh water obtained by treatment in the embodiment

[0081]

[0082]

[0083] Table 5 Water quality standards for recycled water used in production workshops

[0084]

[0085]

[0086] It can be seen from Tables 3-5 that after the effluent from the daily chemical wastewater treatment station is deeply treated by the daily chemical wastewater treatment system provided by the utility model, the removal rate of COD, chloride, and total dissolved solids in the effluent can reach more than 85%, and the organic matter removal effect is good; the content of microorganisms such as bacteria in the wastewater is greatly reduced, and the total coliform group in the effluent is not detected; the hardness and conductivity of the treated effluent are reduced, and the water quality indicators meet the "Suzhou Drinking Water Quality Index Limits (2021)" index requirements, the "GB / T19923-2005 Urban Wastewater Recycling Industrial Water Quality" for "washing water" and "process and product water" index requirements, the "GB3838-2002 Surface Water Environmental Quality Standard" for Class I surface water BOD / COD index requirements, and the recycled water index requirement of conductivity <100μs / cm. It can be directly reused in the production workshop for pre-cleaning of production workshop equipment and pipelines, etc.

Claims

1. A daily chemical wastewater treatment system, characterized in that: Along the water flow direction, it includes a primary filtration system, a biochemical treatment system, a chemical disinfection device, an intermediate filtration system and a reverse osmosis system connected in sequence; The primary filtration system includes a self-cleaning filter; The intermediate filtration system includes a bag filter and an activated carbon filter connected in sequence.

2. The daily chemical wastewater treatment system according to claim 1, characterized in that: The treatment system further comprises a first intermediate water tank and a second intermediate water tank connected in sequence; the second intermediate water tank is connected to the self-cleaning filter.

3. The daily chemical wastewater treatment system according to claim 1, characterized in that: The biochemical treatment system comprises an aerated biological filter tank; the aerated biological filter tank is filled with fillers.

4. The daily chemical wastewater treatment system according to claim 1, characterized in that: The treatment system further comprises a backwash water tank; the backwash water tank is connected to the primary filtration system and the biochemical treatment system respectively; the backwash water tank is also connected to the regulating tank.

5. The daily chemical wastewater treatment system according to claim 1, characterized in that: The reverse osmosis system comprises a security filter and a membrane assembly which are connected in sequence.

6. The daily chemical wastewater treatment system according to claim 5, characterized in that: The reverse osmosis system further includes a conductivity meter, an ORP meter, a pH meter and a flow meter.

7. The daily chemical wastewater treatment system according to claim 5, characterized in that: The membrane module includes a spiral-wound membrane element.

8. The daily chemical wastewater treatment system according to claim 7, characterized in that: The reverse osmosis system further comprises a cleaning device; the cleaning device is connected to the membrane assembly.

9. The daily chemical wastewater treatment system according to claim 7, characterized in that: A physical disinfection device is provided on the pipeline connecting the membrane assembly.

10. The daily chemical wastewater treatment system according to claim 9, characterized in that: The physical disinfection device includes an ultraviolet sterilizer.

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