Rural sewage and organic chemical sewage comprehensive treatment method

Abstract

The invention relates to the technical field of rural sewage and organic chemical engineering sewage treatment, in particular to a rural sewage and organic chemical engineering sewage comprehensive treatment method which comprises the following steps: pretreating rural sewage and organic chemical engineering sewage by using an aerated grit chamber; the rural sewage and the organic chemical sewage treated by the aerated grit chamber enter a grating tank to be treated; the rural sewage and the organic chemical sewage treated by the grating tank sequentially enter an anaerobic tank, an anoxic tank and an aerobic tank to be treated; the rural sewage and the organic chemical sewage treated by the aerobic tank enter a membrane bioreactor to be treated; the rural sewage and the organic chemical sewage treated by the membrane bioreactor enter the reverse osmosis mechanism to be treated. According to the invention, the sewage treatment efficiency is improved, efficient purification and resource utilization of sewage are realized by reducing pollutant discharge, natural water is protected from being polluted, and virtuous circle of ecological environment is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of rural sewage and organic chemical sewage treatment, and in particular to a comprehensive treatment method for rural sewage and organic chemical sewage. Background Art

[0002] With the accelerated advancement of rural urbanization in recent years, the lifestyle of rural residents has changed significantly, which has directly led to a sharp increase in the amount of domestic sewage generated in rural areas. However, due to the lack or imperfection of treatment facilities, most of these sewage is directly discharged into the natural environment without effective treatment, causing pollution to the water environment. Problems such as eutrophication of surface water and deterioration of groundwater quality occur frequently, which not only destroys the ecological balance, but also seriously threatens drinking water safety.

[0003] Rural domestic sewage has a complex composition, containing suspended or dissolved organic matter, inorganic salts such as nitrogen and phosphorus, and various microorganisms. It is highly biodegradable and has a high content of pathogens, but relatively few toxic and harmful substances such as heavy metals. In addition, rural domestic sewage has the characteristics of dispersed discharge points, relatively low pollutant concentrations, and large changes in water quality and water volume. These characteristics have brought considerable challenges to sewage treatment.

[0004] At the same time, the problem of organic pesticide pollution cannot be ignored. Commonly used organochlorine pesticides, such as DDT, hexachloride and its derivatives, as well as chlordane, heptachlor, aldrin, etc., are characterized by low volatility, hydrophobicity, persistence and difficulty in degradation. After these organochlorine pesticides enter the human and animal bodies through the food chain, they can accumulate and produce carcinogenic, teratogenic and mutagenic effects, posing a serious threat to organisms and human health. With the annual increase in the production and use of organochlorine pesticides, their potential risks to the environment have become increasingly prominent, and have become one of the environmental problems that need to be solved urgently.

[0005] At present, most of the different types of wastewater in the market are treated with a single treatment process. Although these treatment processes are good in practicality and the effluent standards can meet the qualified requirements, they are difficult to treat when treating rural sewage due to the small scale of treatment (usually a daily treatment volume of 100m3). 3 Containerized treatment equipment is often used for wastewater treatment projects. However, this treatment method has problems such as a narrow scope of use and waste of resources. Especially for short-term treatment projects such as emergency treatment and pesticide wastewater, containerized treatment equipment is often idle after completing the task, resulting in a waste of manpower and material resources.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a comprehensive treatment method for rural sewage and organic chemical sewage, which not only improves the sewage treatment efficiency, but also achieves efficient purification and resource utilization of sewage by reducing the discharge of pollutants.

[0008] The present invention provides a method for comprehensive treatment of rural sewage and organic chemical sewage, comprising the following steps:

[0009] S1. Use aerated grit chamber to pre-treat rural sewage and organic chemical sewage;

[0010] S2. Rural sewage and organic chemical sewage treated in the aerated grit chamber enter the grid tank for treatment;

[0011] S3. Rural sewage and organic chemical sewage treated in the grid tank are sequentially sent to the anaerobic tank, anoxic tank and aerobic tank for treatment;

[0012] S4. Rural sewage and organic chemical sewage treated in the aerobic tank enter the membrane bioreactor for treatment;

[0013] S5. Rural sewage and organic chemical sewage treated by membrane bioreactor enter the reverse osmosis mechanism for treatment.

[0014] As a preferred embodiment of the present technical solution, in step S1, the aerated grit chamber comprises a first cylinder, a conical barrel and a second cylinder arranged in sequence from top to bottom, wherein the first cylinder is connected to the large mouth end of the conical barrel, the second cylinder is connected to the small mouth end of the conical barrel, a water guide groove is arranged around the inner side wall of the first cylinder, a microporous aeration tube is arranged on the inner side wall of the conical barrel, and the inner diameter ratio of the first cylinder, the conical barrel and the second cylinder is 4:(2-2.5):1.

[0015] As a preferred embodiment of the present technical solution, in step S2, the diameter of the grille in the grille pool is 1.5-9 mm.

[0016] As a preferred embodiment of the present technical solution, in step S3, the temperature of the anaerobic tank is controlled to be 25-40°C and the pH is controlled to be 6.8-7.2.

[0017] As a preferred embodiment of the present technical solution, in step S3, the temperature of the anoxic tank is controlled to be 15-30°C, and the concentration of dissolved oxygen is controlled to be 0.2-0.5 mg / L.

[0018] As a preferred embodiment of the present technical solution, in step S3, the temperature of the aerobic pool is controlled to be 15-30°C, the pH is controlled to be 6.5-8.5, and the concentration of dissolved oxygen is not less than 2 mg / L.

[0019] As a preferred embodiment of the present technical solution, in step S4, the membrane material used in the membrane bioreactor includes any one of polysulfone, polyethersulfone, polyacrylonitrile, polyvinylidene fluoride, polyethylene and polypropylene, and the pore size of the membrane material is 0.1 μm-0.4 μm.

[0020] As a preferred embodiment of the present technical solution, in step S4, in the membrane bioreactor, the sludge concentration is 4000-6000 mg / L, the hydraulic retention time is 6-12 h, the solid retention time is 30-50 d, and the organic load is 0.2-1.0 BOD5 / m 3 ·d.

[0021] As a preferred embodiment of the present technical solution, in step S5, the reverse osmosis mechanism includes a shell and a front chamber, a reverse osmosis membrane chamber and a rear chamber which are sequentially arranged inside the shell along the water flow direction and connected in sequence, the membrane bioreactor is connected to the front chamber, and the rear chamber is reversely connected to the aerated grit tank and the front chamber.

[0022] As a preferred embodiment of the present technical solution, in step S5, the material of the membrane in the reverse osmosis membrane chamber includes any one of cellulose acetate, polyamide, polysulfoneamide and polyimide, and the molecular weight cutoff of the membrane is below 200;

[0023] Preferably, the water inlet pressure of the reverse osmosis membrane chamber is 2-4 MPa, the recovery rate is 50%-80%, the water inlet temperature is 10-30°C, and the sludge density index is less than 5.

[0024] The comprehensive treatment method of rural sewage and organic chemical sewage of the present invention has at least the following beneficial effects:

[0025] The present invention firstly uses an aerated grit chamber as a pretreatment step, which can effectively remove large particle impurities and heavier inorganic substances (such as sand particles) in sewage, prevent these substances from wearing and clogging subsequent treatment equipment, and improve the stability and operation efficiency of the entire treatment system. The grid tank treatment further refines the pretreatment process, removes finer suspended matter and floating matter by physical interception, ensures that the sewage water quality entering the subsequent biochemical treatment stage is relatively pure, and is conducive to the growth of microorganisms and the decomposition of organic matter. Further, the combination of anaerobic tanks, anoxic tanks and aerobic tanks forms a complete biological treatment system, which can efficiently remove organic matter, nitrogen, phosphorus and other pollutants in sewage. Anaerobic tanks and anoxic tanks promote denitrification through different microbial communities to reduce nitrogen loads; aerobic tanks strengthen the oxidation decomposition and nitrification of organic matter to improve the effluent quality. After biochemical treatment, the membrane bioreactor ultrafiltration or nanofiltration membrane technology is further used to effectively intercept suspended matter, colloids, bacteria, viruses and most soluble organic matter in the water to achieve deep purification of sewage. Finally, the reverse osmosis mechanism is used to further remove salt, heavy metal ions and other small molecular solutes in the water to meet high standards of water quality, so that the treated sewage can be safely used for agricultural irrigation, industrial cooling or other non-drinking purposes, thereby achieving effective reuse of water resources and reducing dependence on and pollution of natural water resources. The entire treatment process of the present invention not only improves the sewage treatment efficiency, but also reduces the discharge of pollutants, realizes efficient purification and resource utilization of sewage, protects natural water bodies from pollution, and promotes the virtuous cycle of the ecological environment, which is of great significance for protecting water resources, improving environmental quality, and promoting sustainable economic and social development. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a flow chart of the comprehensive treatment method for rural sewage and organic chemical sewage of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the comprehensive treatment system of rural sewage and organic chemical sewage of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the reverse osmosis mechanism of the present invention.

[0030] Description of reference numerals:

[0031] 1: Aerated grit chamber; 2: Grid tank; 3: Membrane bioreactor; 4: Reverse osmosis mechanism; 5: Front chamber; 6: Reverse osmosis membrane chamber; 7: Rear chamber; 8: Agitator; 9: Flushing device; 10: Anaerobic tank; 11: Anoxic tank; 12: Aerobic tank. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form also includes the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this description, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1-3 As shown, this embodiment provides a method for comprehensive treatment of rural sewage and organic chemical sewage:

[0037] S1. Pre-treating rural sewage and organic chemical sewage using an aerated grit chamber 1, wherein the aerated grit chamber 1 comprises a first cylinder, a conical barrel, and a second cylinder arranged in sequence from top to bottom, the first cylinder is connected to the large-mouth end of the conical barrel, the second cylinder is connected to the small-mouth end of the conical barrel, a water guide groove is arranged around the inner side wall of the first cylinder, a microporous aeration tube is arranged on the inner side wall of the conical barrel, and the inner diameter ratio of the first cylinder, the conical barrel, and the second cylinder is 4:2:1;

[0038] S2, rural sewage and organic chemical sewage treated in the aerated grit chamber 1 enter the grid chamber 2 for treatment, wherein the diameter of the grid in the grid chamber 2 is 1.5-9 mm, and a flushing device 9 is provided above the grid chamber 2;

[0039] S3, the rural sewage and organic chemical sewage treated by the grille tank 2 enter the anaerobic tank 10, the anoxic tank 11 and the aerobic tank 12 for treatment in sequence, wherein the temperature of the anaerobic tank 10 is 25°C, the pH is 7.2, the temperature of the anoxic tank 11 is 15°C, the concentration of dissolved oxygen is 0.5mg / L, the temperature of the aerobic tank 12 is 15°C, the pH is 8.5, and the concentration of dissolved oxygen is not less than 2mg / L;

[0040] S4, rural sewage and organic chemical sewage treated in aerobic tank 12 enter membrane bioreactor 3 with a membrane material of polysulfone and a pore size of 0.1μm-0.4μm for treatment. During the treatment process of membrane bioreactor 3, the sludge concentration is controlled to be 4000mg / L, the hydraulic retention time is 6h, the solid retention time is 30d, and the organic load is 0.2BOD5 / m 3 ·d;

[0041] S5. The rural sewage and organic chemical sewage treated by the membrane bioreactor 3 enter the reverse osmosis mechanism 4 whose membrane material is acetate fiber and whose retention molecular weight is below 200 for treatment. During the treatment process of the reverse osmosis mechanism 4, the water inlet pressure of the reverse osmosis membrane chamber 6 is 2MPa, the recovery rate is 50%, the water inlet temperature is 10°C, and the sludge density index is less than 5.

[0042] Example 2

[0043] like Figure 1-3 As shown, this embodiment provides a method for comprehensive treatment of rural sewage and organic chemical sewage:

[0044] S1. Pre-treating rural sewage and organic chemical sewage using an aerated grit chamber 1, wherein the aerated grit chamber 1 comprises a first cylinder, a conical barrel, and a second cylinder arranged in sequence from top to bottom, the first cylinder is connected to the large-mouth end of the conical barrel, the second cylinder is connected to the small-mouth end of the conical barrel, a water guide groove is arranged around the inner side wall of the first cylinder, a microporous aeration tube is arranged on the inner side wall of the conical barrel, and the inner diameter ratio of the first cylinder, the conical barrel, and the second cylinder is 4:2.5:1;

[0045] S2, rural sewage and organic chemical sewage treated in aeration grit chamber 1 enters grid chamber 2 for treatment, wherein the diameter of the grid in grid chamber 2 is 1.5-9 mm;

[0046] S3, the rural sewage and organic chemical sewage treated by the grille tank 2 enter the anaerobic tank 10, the anoxic tank 11 and the aerobic tank 12 for treatment in sequence, wherein the temperature of the anaerobic tank 10 is 40°C, the pH is 7.2, the temperature of the anoxic tank 11 is 30°C, the concentration of dissolved oxygen is 0.5mg / L, the temperature of the aerobic tank 12 is 30°C, the pH is 8.5, and the concentration of dissolved oxygen is not less than 2mg / L;

[0047] S4, rural sewage and organic chemical sewage treated in aerobic tank 12 enter membrane bioreactor 3 with a membrane material of polysulfone and a pore size of 0.1μm-0.4μm for treatment. During the treatment process of membrane bioreactor 3, the sludge concentration is controlled to be 6000mg / L, the hydraulic retention time is 12h, the solid retention time is 50d, and the organic load is 1.0BOD5 / m 3 ·d;

[0048] S5. The rural sewage and organic chemical sewage treated by the membrane bioreactor 3 enter the reverse osmosis mechanism 4 whose membrane material is acetate fiber and whose retention molecular weight is below 200 for treatment. During the treatment process of the reverse osmosis mechanism 4, the water inlet pressure of the reverse osmosis membrane chamber 6 is 4 MPa, the recovery rate is 80%, the water inlet temperature is 30°C, and the sludge density index is less than 5.

[0049] Example 3

[0050] like Figure 1-3 As shown, this embodiment provides a method for comprehensive treatment of rural sewage and organic chemical sewage:

[0051] S1. Pre-treating rural sewage and organic chemical sewage using an aerated grit chamber 1, wherein the aerated grit chamber 1 comprises a first cylinder, a conical barrel, and a second cylinder arranged in sequence from top to bottom, the first cylinder is connected to the large-mouth end of the conical barrel, the second cylinder is connected to the small-mouth end of the conical barrel, a water guide groove is arranged around the inner side wall of the first cylinder, a microporous aeration tube is arranged on the inner side wall of the conical barrel, and the inner diameter ratio of the first cylinder, the conical barrel, and the second cylinder is 4:2.2:1;

[0052] S2, rural sewage and organic chemical sewage treated in aeration grit chamber 1 enters grid chamber 2 for treatment, wherein the diameter of the grid in grid chamber 2 is 1.5-9 mm;

[0053] S3, the rural sewage and organic chemical sewage treated by the grille tank 2 enter the anaerobic tank 10, the anoxic tank 11 and the aerobic tank 12 for treatment in sequence, wherein the temperature of the anaerobic tank 10 is 30°C, the pH is 7.0, the temperature of the anoxic tank 11 is 20°C, the concentration of dissolved oxygen is 0.3mg / L, the temperature of the aerobic tank 12 is 20°C, the pH is 7.5, and the concentration of dissolved oxygen is not less than 2mg / L;

[0054] S4, rural sewage and organic chemical sewage treated in aerobic tank 12 enter membrane bioreactor 3 with a membrane material of polysulfone and a pore size of 0.1μm-0.4μm for treatment. During the treatment process of membrane bioreactor 3, the sludge concentration is controlled to be 5000mg / L, the hydraulic retention time is 9h, the solid retention time is 40d, and the organic load is 0.5BOD5 / m 3 ·d;

[0055] S5. The rural sewage and organic chemical sewage treated by the membrane bioreactor 3 enter the reverse osmosis mechanism 4 whose membrane material is acetate fiber and whose retention molecular weight is below 200 for treatment. During the treatment process of the reverse osmosis mechanism 4, the water inlet pressure of the reverse osmosis membrane chamber 6 is 3MPa, the recovery rate is 60%, the water inlet temperature is 20°C, and the sludge density index is less than 5.

[0056] Example 4

[0057] like Figure 1-3 As shown, this embodiment provides a method for comprehensive treatment of rural sewage and organic chemical sewage:

[0058] S1. Pre-treating rural sewage and organic chemical sewage using an aerated grit chamber 1, wherein the aerated grit chamber 1 comprises a first cylinder, a conical barrel, and a second cylinder arranged in sequence from top to bottom, the first cylinder is connected to the large-mouth end of the conical barrel, the second cylinder is connected to the small-mouth end of the conical barrel, a water guide groove is arranged around the inner side wall of the first cylinder, a microporous aeration tube is arranged on the inner side wall of the conical barrel, and the inner diameter ratio of the first cylinder, the conical barrel, and the second cylinder is 4:2.3:1;

[0059] S2, rural sewage and organic chemical sewage treated in aeration grit chamber 1 enters grid chamber 2 for treatment, wherein the diameter of the grid in grid chamber 2 is 1.5-9 mm;

[0060] S3, the rural sewage and organic chemical sewage treated by the grille tank 2 enter the anaerobic tank 10, the anoxic tank 11 and the aerobic tank 12 for treatment in sequence, wherein the temperature of the anaerobic tank 10 is 35°C, the pH is 7, the temperature of the anoxic tank 11 is 25°C, the concentration of dissolved oxygen is 0.4mg / L, the temperature of the aerobic tank 12 is 25°C, the pH is 7, and the concentration of dissolved oxygen is not less than 2mg / L;

[0061] S4, rural sewage and organic chemical sewage treated in aerobic tank 12 enter membrane bioreactor 3 with a membrane material of polysulfone and a pore size of 0.1μm-0.4μm for treatment. During the treatment process of membrane bioreactor 3, the sludge concentration is controlled to be 5500mg / L, the hydraulic retention time is 10h, the solid retention time is 35d, and the organic load is 0.8BOD5 / m 3 ·d;

[0062] S5. The rural sewage and organic chemical sewage treated by the membrane bioreactor 3 enter the reverse osmosis mechanism 4 whose membrane material is acetate fiber and whose retention molecular weight is below 200 for treatment. During the treatment process of the reverse osmosis mechanism 4, the water inlet pressure of the reverse osmosis membrane chamber 6 is 4 MPa, the recovery rate is 70%, the water inlet temperature is 25°C, and the sludge density index is less than 5.

[0063] Example 5

[0064] like Figure 1-3 As shown, this embodiment provides a method for comprehensive treatment of rural sewage and organic chemical sewage:

[0065] S1. Pre-treating rural sewage and organic chemical sewage using an aerated grit chamber 1, wherein the aerated grit chamber 1 comprises a first cylinder, a conical barrel, and a second cylinder arranged in sequence from top to bottom, the first cylinder is connected to the large-mouth end of the conical barrel, the second cylinder is connected to the small-mouth end of the conical barrel, a water guide groove is arranged around the inner side wall of the first cylinder, a microporous aeration tube is arranged on the inner side wall of the conical barrel, and the inner diameter ratio of the first cylinder, the conical barrel, and the second cylinder is 4:2.2:1;

[0066] S2, rural sewage and organic chemical sewage treated in aeration grit chamber 1 enters grid chamber 2 for treatment, wherein the diameter of the grid in grid chamber 2 is 1.5-9 mm;

[0067] S3, the rural sewage and organic chemical sewage treated by the grille tank 2 enter the anaerobic tank 10, the anoxic tank 11 and the aerobic tank 12 for treatment in sequence, wherein the temperature of the anaerobic tank 10 is 40°C, the pH is 6.8, the temperature of the anoxic tank 11 is 30°C, the concentration of dissolved oxygen is 0.3mg / L, the temperature of the aerobic tank 12 is 20°C, the pH is 8, and the concentration of dissolved oxygen is not less than 2mg / L;

[0068] S4, rural sewage and organic chemical sewage treated in aerobic tank 12 enter membrane bioreactor 3 with a membrane material of polysulfone and a pore size of 0.1μm-0.4μm for treatment. During the treatment process of membrane bioreactor 3, the sludge concentration is controlled to be 4500mg / L, the hydraulic retention time is 10h, the solid retention time is 35d, and the organic load is 0.8BOD5 / m 3 ·d;

[0069] S5. The rural sewage and organic chemical sewage treated by the membrane bioreactor 3 enter the reverse osmosis mechanism 4 whose membrane material is acetate fiber and whose retention molecular weight is below 200 for treatment. During the treatment process of the reverse osmosis mechanism 4, the water inlet pressure of the reverse osmosis membrane chamber 6 is 2MPa, the recovery rate is 75%, the water inlet temperature is 30°C, and the sludge density index is less than 5.

[0070] Example 6

[0071] like Figure 1-3 As shown, this embodiment provides a method for comprehensive treatment of rural sewage and organic chemical sewage:

[0072] S1. Pre-treating rural sewage and organic chemical sewage using an aerated grit chamber 1, wherein the aerated grit chamber 1 comprises a first cylinder, a conical barrel, and a second cylinder arranged in sequence from top to bottom, the first cylinder is connected to the large-mouth end of the conical barrel, the second cylinder is connected to the small-mouth end of the conical barrel, a water guide groove is arranged around the inner side wall of the first cylinder, a microporous aeration tube is arranged on the inner side wall of the conical barrel, and the inner diameter ratio of the first cylinder, the conical barrel, and the second cylinder is 4:2.5:1;

[0073] S2, rural sewage and organic chemical sewage treated in aeration grit chamber 1 enters grid chamber 2 for treatment, wherein the diameter of the grid in grid chamber 2 is 1.5-9 mm;

[0074] S3, the rural sewage and organic chemical sewage treated by the grille tank 2 enter the anaerobic tank 10, the anoxic tank 11 and the aerobic tank 12 for treatment in sequence, wherein the temperature of the anaerobic tank 10 is 30°C, the pH is 6.9, the temperature of the anoxic tank 11 is 18°C, the concentration of dissolved oxygen is 0.3mg / L, the temperature of the aerobic tank 12 is 18°C, the pH is 8.0, and the concentration of dissolved oxygen is not less than 2mg / L;

[0075] S4, rural sewage and organic chemical sewage treated in aerobic tank 12 enter membrane bioreactor 3 with a membrane material of polysulfone and a pore size of 0.1μm-0.4μm for treatment. During the treatment process of membrane bioreactor 3, the sludge concentration is controlled to be 4200mg / L, the hydraulic retention time is 10h, the solid retention time is 30d, and the organic load is 0.3BOD5 / m 3 ·d;

[0076] S5. The rural sewage and organic chemical sewage treated by the membrane bioreactor 3 enter the reverse osmosis mechanism 4 whose membrane material is acetate fiber and whose retention molecular weight is below 200 for treatment. During the treatment process of the reverse osmosis mechanism 4, the water inlet pressure of the reverse osmosis membrane chamber 6 is 3MPa, the recovery rate is 55%, the water inlet temperature is 10°C, and the sludge density index is less than 5.

[0077] Studies have shown that the effluent from the above embodiments can meet the "Comprehensive Wastewater Discharge Standard of a Certain City" and relevant local regulations, indicating that the method of the present invention has an excellent treatment effect on rural sewage and organic chemical sewage.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for comprehensive treatment of rural sewage and organic chemical sewage, characterized in that: The following steps are involved: S1. Pre-treat rural sewage and organic chemical sewage using an aerated grit chamber (1); S2, rural sewage and organic chemical sewage treated in the aerated grit chamber (1) enter the grid chamber (2) for treatment; S3, rural sewage and organic chemical sewage treated in the grid tank (2) enter the anaerobic tank (10), the anoxic tank (11) and the aerobic tank (12) for treatment in sequence; S4, the rural sewage and organic chemical sewage treated in the aerobic tank (12) enter the membrane bioreactor (3) for treatment; S5. The rural sewage and organic chemical sewage treated by the membrane bioreactor (3) enter the reverse osmosis mechanism (4) for treatment.

2. The method for comprehensive treatment of rural sewage and organic chemical sewage according to claim 1, characterized in that: In step S1, the aerated grit chamber (1) comprises a first cylinder, a conical barrel and a second cylinder which are arranged in sequence from top to bottom, wherein the first cylinder is connected to the large-mouth end of the conical barrel, the second cylinder is connected to the small-mouth end of the conical barrel, a water guide groove is arranged around the inner wall of the first cylinder, a microporous aeration tube is arranged on the inner wall of the conical barrel, and the inner diameter ratio of the first cylinder, the conical barrel and the second cylinder is 4:(2-2.5):

1.

3. The method for comprehensive treatment of rural sewage and organic chemical sewage according to claim 1, characterized in that: In step S2, the diameter of the grille in the grille pool (2) is 1.5-9 mm.

4. The method for comprehensive treatment of rural sewage and organic chemical sewage according to claim 1, characterized in that: In step S3, the temperature of the anaerobic tank (10) is controlled to be 25-40°C and the pH to be 6.8-7.

2.

5. The method for comprehensive treatment of rural sewage and organic chemical sewage according to claim 1, characterized in that: In step S3, the temperature of the anoxic tank (11) is controlled to be 15-30°C, and the concentration of dissolved oxygen is controlled to be 0.2-0.5 mg / L.

6. The method for comprehensive treatment of rural sewage and organic chemical sewage according to claim 1, characterized in that: In step S3, the temperature of the aerobic pool (12) is controlled to be 15-30°C, the pH to be 6.5-8.5, and the concentration of dissolved oxygen to be not less than 2 mg / L.

7. The method for comprehensive treatment of rural sewage and organic chemical sewage according to claim 1, characterized in that: In step S4, the membrane material used in the membrane bioreactor (3) includes any one of polysulfone, polyethersulfone, polyacrylonitrile, polyvinylidene fluoride, polyethylene and polypropylene, and the pore size of the membrane material is 0.1-0.4 μm.

8. The method for comprehensive treatment of rural sewage and organic chemical sewage according to claim 1, characterized in that: In step S4, in the membrane bioreactor (3), the sludge concentration is 4000-6000 mg / L, the hydraulic retention time is 6-12 h, the solid retention time is 30-50 d, and the organic load is 0.2-1.0 BOD5 / m 3 ·d.

9. The method for comprehensive treatment of rural sewage and organic chemical sewage according to claim 1, characterized in that: In step S5, the reverse osmosis mechanism (4) comprises a shell and a front chamber (5), a reverse osmosis membrane chamber (6) and a rear chamber (7) which are sequentially arranged inside the shell along the water flow direction and are sequentially connected, the membrane bioreactor (3) is connected to the front chamber (5), and the rear chamber (7) is reversely connected to the aerated grit chamber (1) and the front chamber (5).

10. The method for comprehensive treatment of rural sewage and organic chemical sewage according to claim 1, characterized in that: In step S5, the material of the membrane in the reverse osmosis membrane chamber (6) includes any one of cellulose acetate, polyamide, polysulfoneamide and polyimide, and the molecular weight cutoff of the membrane is less than 200; Preferably, the water inlet pressure of the reverse osmosis membrane chamber (6) is 2-4 MPa, the recovery rate is 50%-80%, the water inlet temperature is 10-30°C, and the sludge density index is less than 5.

Images