Fecal sewage treatment method and application thereof

Abstract

The invention provides a fecal sewage treatment method and application thereof, and the method comprises the following steps: sequentially carrying out filtration treatment, ozone treatment, coagulation treatment and dehydration treatment on fecal sewage to obtain product water; the coagulation treatment comprises the step of mixing the PAC dry powder with water to be treated. The fecal sewage treatment method provided by the invention has the characteristics of relatively low energy consumption, relatively short treatment time and relatively good effluent quality.

Description

Technical Field

[0001] The invention relates to a method for treating fecal wastewater, in particular to a method for treating fecal wastewater and application thereof, and belongs to the field of environmental engineering. Background Art

[0002] At present, fecal wastewater is often treated by evaporation, septic tank fermentation, anaerobic biological treatment and other methods. However, the evaporation method converts electrical energy into heat energy to evaporate the water in fecal wastewater, which has the disadvantage of high power consumption; the biogas produced by the septic tank fermentation method is flammable and poses a safety hazard, and the effluent obtained by this method has the disadvantage of being turbid and smelly; the hydraulic retention time of anaerobic biological treatment is long, so the treatment takes a long time, and the effluent also has the disadvantage of being turbid and smelly.

[0003] Therefore, developing a method for treating fecal wastewater with low energy consumption, short treatment time and good effluent quality has become a research direction in this field. Summary of the invention

[0004] The invention provides a method for treating fecal sewage, which has the characteristics of low energy consumption, short treatment time and good effluent quality.

[0005] The present invention also provides a fecal and sewage treatment device, which has the characteristics of low energy consumption, short treatment time and good effluent water quality.

[0006] The present invention provides a method for treating fecal wastewater, comprising sequentially performing filtering treatment, ozone treatment, coagulation treatment, and dehydration treatment on the fecal wastewater to obtain a product filtrate;

[0007] The coagulation treatment includes mixing PAC dry powder with water to be treated.

[0008] In the method for treating fecal wastewater as described above, the dosage of the PAC dry powder is 3-6wt‰ of the mass of the water to be treated.

[0009] In the method for treating fecal wastewater as described above, the coagulation treatment further comprises mixing carbon powder with the water to be treated.

[0010] In the method for treating fecal wastewater as described above, the dosage of the carbon powder is 2-4wt‰ of the mass of the water to be treated.

[0011] The method for treating fecal wastewater as described above, wherein the ozone dosage for the ozone treatment is 2-5 kg / m³.

[0012] The method for treating fecal wastewater as described above, wherein the filtration pore size of the filtration treatment is less than or equal to 3 mm.

[0013] In the method for treating fecal wastewater as described above, the dehydration treatment is specifically a plate and frame filter press treatment, and the feed pressure is 0.4-0.5MPa.

[0014] A fecal and sewage treatment device for executing any of the above-mentioned fecal and sewage treatment methods comprises a filtration treatment unit, an ozone treatment unit, a coagulation treatment unit, and a dehydration treatment unit which are connected in sequence.

[0015] The feces and sewage treatment device as described above, wherein the filtering treatment unit comprises a basket-type grille; and / or,

[0016] The ozone treatment unit comprises a water-cooled ozone generator; and / or,

[0017] The dehydration processing unit includes a plate and frame filter press.

[0018] A simple living device, comprising a feces and sewage treatment device for executing any of the feces and sewage treatment methods described above.

[0019] The fecal sewage treatment method provided by the present invention has the characteristics of low energy consumption, short treatment time and good effluent water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 A structural diagram of a first type of feces and sewage treatment device provided by the present invention;

[0022] Figure 2 This is a device diagram of the first fecal and sewage treatment device provided by the present invention.

[0023] Description of reference numerals:

[0024] A- filtration processing unit;

[0025] B-Ozone treatment unit;

[0026] C-coagulation treatment unit;

[0027] D-dehydration treatment unit;

[0028] A1-basket grille;

[0029] B1-Ozone generator;

[0030] B2-Ozone treatment reaction tank;

[0031] C1-PAC dry powder storage tank;

[0032] C2-Carbon powder storage tank;

[0033] C3-coagulation treatment reaction tank;

[0034] D1-Plate and frame filter press. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] The terms "first", "second" and "third" (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0039] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0040] A first aspect of the present invention provides a method for treating fecal wastewater, which comprises sequentially subjecting the fecal wastewater to filtration treatment, ozone treatment, coagulation treatment, and dehydration treatment to obtain a product filtrate.

[0041] The method for treating fecal wastewater provided by the present invention can be used for treating domestic wastewater containing fecal wastewater. Among them, the filtration treatment can remove large-sized foreign matter contained in the fecal wastewater, and prevent the foreign matter from entering the subsequent treatment equipment and causing system paralysis. The present invention does not limit the specific filtration accuracy of the filtration treatment, and the commonly used filtration accuracy in the field can be used.

[0042] Ozone treatment is achieved by mixing ozone into sewage and using the strong oxidizing property of ozone to break the long chains of organic matter that is difficult to degrade in sewage, thereby achieving degradation of organic matter in sewage, thereby effectively removing odorous organic matter, nitrogen, phosphorus and other pollutants in sewage, and facilitating subsequent treatment. The present invention does not limit the specific ozone dosage for ozone treatment, and the ozone dosage commonly used in the art can be used.

[0043] The coagulation treatment mixes a coagulant with the water to be treated. The coagulant causes the colloidal particles and tiny suspended solids in the water to aggregate and settle, thereby achieving the effect of removing the colloidal particles and tiny suspended solids in the water to be treated. In addition, the coagulant can also remove phosphorus-containing pollutants in the water to be treated, thereby reducing the total phosphorus in the water to be treated. In the fecal sewage treatment method provided by the present invention, the coagulant includes PAC dry powder. In this treatment method, the PAC dry powder does not need to be dissolved in water in advance, but is directly added into the water to be treated and mixed with the water to be treated to achieve colloidal particles and tiny suspended solids, thereby improving the water quality.

[0044] During the coagulation treatment, the colloidal particles and tiny suspended solids in the water to be treated form sediments. The dehydration treatment further separates the sediments from the water phase to obtain a treated product supernatant, which can be reused as reclaimed water. The present invention does not limit the specific implementation of the dehydration treatment, and a dehydration treatment method commonly used in the art can be used. For example, a sludge dehydrator can be used to treat a mixture including sediments and water phase substances to obtain dehydrated sludge and product water. The dehydrated sludge and product water can be discharged or used as raw materials for other processes.

[0045] The inventors found that the fecal sewage treatment method provided by the present invention has the characteristics of low energy consumption, short treatment time and good effluent water quality. The inventors speculate that the reason may be that since the coagulant includes PAC dry powder, and the coagulant is directly mixed with the water to be treated without being dissolved in advance, a part of the PAC dry powder is not completely dissolved, and acts as a nucleating agent in the mixed system, which helps the colloidal particles and tiny suspended matter in the water to aggregate more completely and efficiently and form sediments, so that the fecal sewage treatment method provided by the present invention has the characteristics of short treatment time and good effluent water quality.

[0046] Furthermore, the method for treating fecal wastewater provided by the present invention does not use biochemical methods to degrade organic matter in wastewater, but uses ozone to achieve rapid degradation of organic matter, thereby further shortening the treatment time of the method provided by the present invention. Furthermore, the present invention does not use traditional evaporation methods to treat fecal wastewater, thereby further reducing treatment energy consumption and operating costs.

[0047] Therefore, the fecal sewage treatment method provided by the present invention has the characteristics of low energy consumption, short treatment time and good effluent water quality.

[0048] In one embodiment, the dosage of PAC dry powder is 3-6wt‰ of the mass of the water to be treated. The appropriate dosage of PAC dry powder can make the colloidal particles and tiny suspended matter in the water gather more completely and efficiently to form sediments, thereby making the characteristics of the fecal sewage treatment method provided by the present invention that the treatment time is short and the effluent water quality is good more prominent.

[0049] Furthermore, in one embodiment, the coagulation treatment further includes mixing carbon powder with the water to be treated. Carbon powder is powdered activated carbon, which can absorb organic matter in the water to be treated, further improving the treatment effect of the coagulation treatment. The present invention does not limit the order of adding carbon powder and PAC dry powder. In one embodiment, carbon powder and PAC dry powder are mixed with the water to be treated at the same time. The synergistic effect of carbon powder and PAC dry powder can further improve the water quality of the effluent from the coagulation treatment.

[0050] Furthermore, in one embodiment, the amount of carbon powder added is 2-4 wt‰ of the mass of the water to be treated. The appropriate amount of carbon powder added can make the characteristic of the fecal sewage treatment method provided by the present invention, that the water quality of the treated water is better, more prominent.

[0051] In one embodiment, the amount of ozone added for ozone treatment is 2-5kg / m³, that is, 2-5kg of ozone is added for every 1m³ of fecal sewage. Specifically, for example, when a 100g / h scale ozone generator is used for sampling treatment, the ozone generator is continuously operated for 7 hours, and the produced ozone is passed into 0.2m³ of fecal sewage for sampling treatment. At this time, the amount of ozone added is 3.5kg / m³. The appropriate amount of ozone added can oxidize the organic matter contained in the water to be treated faster and more completely, making the fecal sewage treatment method provided by the present invention more prominent in that the treatment time is short and the effluent water quality is good.

[0052] In one embodiment, the filtration aperture of the filtration treatment is less than or equal to 3 mm. A smaller filtration aperture helps to remove foreign matter contained in the fecal wastewater to a greater extent, reduces the probability of failure of subsequent treatment processes due to foreign matter, and makes the fecal wastewater treatment method provided by the present invention more reliable.

[0053] Furthermore, in one embodiment, the dehydration treatment is specifically a plate-and-frame filter press treatment, and the feed pressure is 0.4-0.5 MPa. The plate-and-frame filter press treatment can efficiently separate the sediment and the aqueous phase contained in the mixed system, and the equipment investment is small. The appropriate feed pressure can reduce the probability of leakage between the filter plates.

[0054] Figure 1 This is a structural diagram of the first type of fecal and sewage treatment device provided by the present invention. Figure 1 As shown, the second aspect of the present invention provides a fecal wastewater treatment device, which is used to perform the fecal wastewater treatment method provided in the first aspect of the present invention. The device includes A-filtration treatment unit, B-ozone treatment unit, C-coagulation treatment unit, and D-dehydration treatment unit connected in sequence.

[0055] Wherein, A-filtration treatment unit is used to perform filtration treatment. The present invention does not limit the specific equipment selection of the filtration unit, as long as it can meet the requirement of filtering larger foreign matter in fecal sewage. In one embodiment, the filtration unit may include at least one of a rotary screen, a drum screen, and a basket screen.

[0056] The B-ozone treatment unit is used to perform ozone treatment. The present invention does not limit the specific equipment selection of the B-ozone treatment unit, as long as it meets the requirement that ozone can be used to treat fecal sewage. In one embodiment, the B-ozone treatment unit includes an ozone generator, and also includes an ozone treatment reaction tank connected to the ozone outlet of the ozone generator, and the ozone treatment reaction tank accommodates ozone and fecal sewage to contact. The inlet of the ozone treatment reaction tank is the inlet of the B-ozone treatment unit, and the outlet of the ozone treatment reaction tank is the outlet of the B-ozone treatment unit.

[0057] The C-coagulation treatment unit is used to perform coagulation treatment. The present invention does not limit the specific equipment selection of the C-coagulation treatment unit, and it only needs to meet the requirement that the water to be treated and the coagulant are mixed and precipitated. In one embodiment, the C-coagulation treatment unit includes a PAC dry powder storage tank, a carbon powder storage tank, and a coagulation treatment reaction tank, and the outlets of the PAC dry powder storage tank and the carbon powder storage tank are connected to the coagulant inlet of the coagulation treatment reaction tank. The coagulation treatment reaction tank is used to accommodate PAC dry powder and carbon powder in contact with the water to be treated. It is understandable that in order to allow the reaction to proceed fully, the coagulation treatment reaction tank may also include a stirring device.

[0058] The D-dehydration treatment unit is used to perform dehydration treatment. The present invention does not limit the specific equipment selection of the D-dehydration treatment unit, and it can meet the requirements of separating the sediment from the water phase to obtain product water. In one embodiment, the D-dehydration treatment unit includes at least one of a centrifugal dehydrator, a spiral dehydrator, and a plate and frame filter press.

[0059] The feces and sewage treatment device provided by the present invention has the characteristics of low energy consumption, short treatment time and good effluent water quality.

[0060] Furthermore, in one embodiment, the A-filtration treatment unit includes a basket-type grille, the filter aperture of which is less than or equal to 3 mm, which can achieve higher precision filtration. Furthermore, the B-ozone treatment unit includes a water-cooled ozone generator, and the ozone production is 100g / h; the D-dehydration treatment unit includes a plate-frame filter press, which is equipped with a 1000-mesh polypropylene filter cloth. Furthermore, the pressure of the hydraulic station set at the end of the plate-frame filter press is determined to be 12-14MPa. This set value can ensure normal working conditions while saving power consumption.

[0061] The third aspect of the present invention provides a simple living device, which includes a fecal and sewage treatment device for executing the fecal and sewage treatment method provided by the first aspect of the present invention.

[0062] The simple living device provided by the present invention is a device for temporary living and residence. The fecal wastewater treatment device provided in the second aspect of the present invention can play a role in treating fecal wastewater generated by residents in the simple living device. The present invention does not limit the specific composition of the device, and it only needs to include a fecal wastewater treatment device for executing the fecal wastewater treatment method provided in the first aspect of the present invention. The device may include A-filtration treatment unit, B-ozone treatment unit, C-coagulation treatment unit, and D-dehydration treatment unit. In one embodiment, it may also include sleeping equipment, cooking equipment, etc.

[0063] The fecal wastewater treatment method and application provided by the present invention are further illustrated by way of examples below.

[0064] Example 1

[0065] This embodiment adopts Figure 2 The fecal and sewage treatment device shown treats fecal and sewage.

[0066] like Figure 2 As shown, the device includes A1-basket grille, B1-ozone generator, ozone treatment reaction tank, C1-PAC dry powder storage tank, C2-carbon powder storage tank, C3-coagulation treatment reaction tank, and D1-plate and frame filter press. Among them, A1-basket grille, ozone treatment reaction tank, C3-coagulation treatment reaction tank, and D1-plate and frame filter press are connected in sequence, B1-ozone generator outlet is connected to ozone inlet of ozone treatment reaction tank, and C1-PAC dry powder storage tank and C2-carbon powder storage tank outlet are connected to coagulant inlet of C3-coagulation treatment reaction tank.

[0067] A1-basket grille belongs to A-filtration treatment unit, B1-ozone generator and ozone treatment reaction tank belong to B-ozone treatment unit, C1-PAC dry powder storage tank, C2-carbon powder storage tank, C3-coagulation treatment reaction tank belong to C-coagulation treatment unit, D1-plate and frame filter press belongs to D-dehydration treatment unit.

[0068] A1-The filtration accuracy of the basket grille is 3mm, B1-The ozone generator is water-cooled and has a scale of 100g / h, C3-The coagulation treatment reaction tank has a stirring facility, D1-The plate and frame filter press uses a 1000 mesh polypropylene filter cloth, and the feed pump pressure of the plate and frame filter press is 0.4-0.5MPa. C1-PAC dry powder storage tank and C2-carbon powder storage tank store PAC dry powder and carbon powder respectively, and the two are mixed with the water to be treated at the same time. The dosage of PAC is 5 wt‰, and the dosage of carbon powder is 3 wt‰.

[0069] Example 2

[0070] This embodiment is basically the same as Embodiment 1, except that no carbon powder is added during the coagulation treatment.

[0071] This embodiment adopts Figure 2 The fecal and sewage treatment device shown treats fecal and sewage.

[0072] like Figure 2 As shown, the device includes A1-basket grille, B1-ozone generator, ozone treatment reaction tank, C1-PAC dry powder storage tank, C2-carbon powder storage tank, C3-coagulation treatment reaction tank, and D1-plate and frame filter press. Among them, A1-basket grille, ozone treatment reaction tank, C3-coagulation treatment reaction tank, and D1-plate and frame filter press are connected in sequence, B1-ozone generator outlet is connected to ozone inlet of ozone treatment reaction tank, and C1-PAC dry powder storage tank and C2-carbon powder storage tank outlet are connected to coagulant inlet of C3-coagulation treatment reaction tank.

[0073] A1-basket grille belongs to A-filtration treatment unit, B1-ozone generator and ozone treatment reaction tank belong to B-ozone treatment unit, C1-PAC dry powder storage tank, C2-carbon powder storage tank, C3-coagulation treatment reaction tank belong to C-coagulation treatment unit, D1-plate and frame filter press belongs to D-dehydration treatment unit.

[0074] A1-The filtration accuracy of the basket grille is 3mm, B1-The ozone generator is water-cooled and has a scale of 100g / h, C3-The coagulation treatment reaction tank has a stirring facility, D1-The plate and frame filter press uses a 1000 mesh polypropylene filter cloth, and the feed pump pressure of the plate and frame filter press is 0.4-0.5MPa. C1-PAC dry powder storage tank and C2-carbon powder storage tank store PAC dry powder and carbon powder respectively. During operation, no carbon powder is added, only PAC dry powder is added. The dosage of PAC is 5 wt‰.

[0075] Comparative Example 1

[0076] This comparative example is basically the same as Example 1, except that the PAC dry powder is first dissolved in 5 times the weight of water to obtain a PAC solution, and then the PAC solution is used for coagulation treatment.

[0077] This comparative example adopts Figure 2 The fecal and sewage treatment device shown treats fecal and sewage.

[0078] like Figure 2 As shown, the device includes A1-basket grille, B1-ozone generator, ozone treatment reaction tank, C1-PAC dry powder storage tank, C2-carbon powder storage tank, C3-coagulation treatment reaction tank, and D1-plate and frame filter press. Among them, A1-basket grille, ozone treatment reaction tank, C3-coagulation treatment reaction tank, and D1-plate and frame filter press are connected in sequence, B1-ozone generator outlet is connected to ozone inlet of ozone treatment reaction tank, and C1-PAC dry powder storage tank and C2-carbon powder storage tank outlet are connected to coagulant inlet of C3-coagulation treatment reaction tank.

[0079] A1-basket grille belongs to A-filtration treatment unit, B1-ozone generator and ozone treatment reaction tank belong to B-ozone treatment unit, C1-PAC dry powder storage tank, C2-carbon powder storage tank, C3-coagulation treatment reaction tank belong to C-coagulation treatment unit, D1-plate and frame filter press belongs to D-dehydration treatment unit.

[0080] A1-The filtration accuracy of the basket grille is 3mm, B1-The ozone generator is water-cooled with a scale of 100g / h, C3-The coagulation treatment reaction tank is equipped with a stirring facility, D1-The plate and frame filter press uses a 1000 mesh polypropylene filter cloth, and the feed pump pressure of the D1-plate and frame filter press is 0.4-0.5MPa. C1-PAC dry powder storage tank and C2-carbon powder storage tank respectively store PAC solution obtained by dissolving PAC dry powder in 5 times the weight of water and carbon powder. During operation, PAC solution and carbon powder are added at the same time. The dosage of PAC is 5 wt‰ (based on PAC in PAC solution), and the dosage of carbon powder is 3 wt‰.

[0081] Test example

[0082] The same fecal wastewater was treated using the methods provided in the above embodiments and comparative examples, and the comparison of the physical and chemical properties of the fecal wastewater before and after treatment is shown in Table 1.

[0083] Table 1

[0084]

[0085] As can be seen from Table 1, after the fecal sewage is treated by the fecal sewage treatment method provided by the present invention, the COD, ammonia nitrogen, total nitrogen and total phosphorus concentrations are significantly reduced. In addition, the water quality of the product obtained after the treatment of Example 1 is better than that of Example 2 and Comparative Example 1. The reason may be that PAC is added in the form of dry powder and PAC and carbon powder are added at the same time. The water quality of the product obtained in Example 2 is inferior to that of Example 1 but better than that of Comparative Example 1. The reason may be that carbon powder is not used in the treatment process. The water quality of the product obtained in Comparative Example 1 is the worst. The reason may be that PAC is not added in the form of dry powder, and the aggregation and sedimentation effect of the colloidal particles and tiny suspended matter in the water to be treated is poor.

[0086] 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 treating fecal wastewater, characterized in that: It includes filtering, ozone, coagulation and dehydration treatment of fecal wastewater in sequence to obtain product filtrate; The coagulation treatment includes mixing PAC dry powder with water to be treated.

2. The method according to claim 1, characterized in that The dosage of the PAC dry powder is 3-6wt‰ of the mass of the water to be treated.

3. The method according to claim 1 or 2, characterized in that: The coagulation treatment further comprises mixing carbon powder with the water to be treated.

4. The method according to claim 3, characterized in that The dosage of the carbon powder is 2-4 wt‰ of the mass of the water to be treated.

5. The method according to any one of claims 1 to 4, characterized in that The ozone dosage of the ozone treatment is 2-5kg / m³.

6. The method according to any one of claims 1 to 5, characterized in that The filtration pore size of the filtration treatment is less than or equal to 3 mm.

7. The method according to any one of claims 1 to 6, characterized in that The dehydration treatment is specifically a plate and frame filter press treatment, and the feed pressure is 0.4-0.5 MPa.

8. A fecal and sewage treatment device for executing the fecal and sewage treatment method according to any one of claims 1 to 7, characterized in that: It includes a filtration treatment unit, an ozone treatment unit, a coagulation treatment unit, and a dehydration treatment unit which are connected in sequence.

9. The device according to claim 8, characterized in that The filtering unit comprises a basket-type grille; and / or, The ozone treatment unit comprises a water-cooled ozone generator; and / or, The dehydration processing unit includes a plate and frame filter press.

10. A simple living device, characterized in that: It comprises a fecal and sewage treatment device for carrying out the fecal and sewage treatment method according to any one of claims 1 to 7.

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