A high solids content wastewater treatment process

Abstract

This invention belongs to the field of industrial wastewater treatment technology, specifically relating to a high-solids-content wastewater treatment process, comprising the following steps: 1) filtering high-solids-content wastewater through a tubular membrane module, one end of the membrane module being sealed and simultaneously connected to an inlet pipe and a compressed air pipe, and the other end being sealed through a valve; 2) sealing the side wall of the membrane module through an inner cylinder to receive the filtrate, the inner cylinder being connected to a drain pipe; 3) opening the valve of the membrane module, and using pulsed air to detach and blow out the filtered material from the inner surface of the membrane module; 4) receiving the filtered material through a heat storage body and heating it to react, the heating temperature being not lower than 150°C, the gas generated by the reaction being collected through an outer cylinder and discharged through an exhaust port, and the residue after the reaction being discharged through a slag discharge port from the outer cylinder; the wastewater treatment process using the technical solution of this invention can solve the problems of existing devices only being able to separate solids and liquids, making it difficult to realize wastewater resource utilization, and having high energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of industrial wastewater treatment technology, specifically relating to a process for treating wastewater with high solids content. Background Technology

[0002] Anaerobic digestion liquid and other high-solids wastewater contain a large amount of inorganic and organic matter, and some even contain a certain concentration of toxic and harmful substances, posing a potential risk to the environment. Therefore, they need to be treated in an environmentally friendly manner.

[0003] Although Chinese patent CN113788513A discloses a filtration and separation device and its application, which uses a ceramic membrane to achieve solid-liquid separation under cross-flow filtration technology, it mainly achieves solid-liquid separation. Subsequent products still need to undergo further treatment, such as anaerobic digestion, to meet discharge standards. Although Chinese patent CN214383741U discloses a treatment device for anaerobic digestion liquid of hot hydrolyzed sludge, which uses a forward osmosis unit and a high-salt concentration unit to treat the digestion liquid, it solves the problem of difficult treatment of anaerobic digestion liquid of hot hydrolyzed sludge. However, the process is complex, energy consumption is high, and the solid matter produced often exists in the form of sludge, which is difficult to utilize as a resource. Summary of the Invention

[0004] The purpose of this invention is to provide a process for treating wastewater with high solids content, so as to solve the problems of high energy consumption and difficulty in resource utilization of existing processes.

[0005] To achieve the above objectives, the present invention provides a high-solids-content wastewater treatment process, comprising the following steps:

[0006] 1) High solids wastewater is filtered through a tubular membrane module. One end of the membrane module is closed and connected to both the inlet pipe and the compressed air pipe, while the other end is closed through a valve.

[0007] 2) The membrane module sidewall is sealed by an inner cylinder to receive the filtrate, and the inner cylinder is connected to a drain pipe;

[0008] 3) Open the valve of the membrane module and use pulsed air to remove and blow out the filtered material from the inner surface of the membrane module;

[0009] 4) The filter material is received and heated to react through the heat storage body. The heating temperature is not lower than 150℃. The gas generated by the reaction is collected through the outer cylinder and discharged through the exhaust port. The residue after the reaction is discharged through the slag discharge port from the outer cylinder.

[0010] As a preferred embodiment, in order to better detach the residue from the heat storage body and allow it to fall and be discharged, the heat storage body has a porous structure and a compressed air inlet is provided above the heat storage body. The residue is resonated and destroyed by pulsed gas with a frequency close to that of the residue, thereby causing it to peel off and be discharged.

[0011] As a preferred option, the heat storage body is heated by one or a combination of electric heating, plasma, and natural gas to improve its performance.

[0012] As a preferred embodiment, in order to reduce the water content in the filtered material and reduce the waste of heat to the heat storage body caused by liquid evaporation during the thermal reaction, step 3 further involves squeezing and draining the filtered material inside the membrane module using compressed air before opening the valve of the membrane module.

[0013] As a preferred embodiment, in order to enable the filtered material to detach more effectively from the inner wall of the membrane module, the frequency of the pulsed air in step 3 is the same as or close to the natural frequency of the filtered material.

[0014] As a preferred option, in order to ensure the filtration efficiency of the membrane module and reduce the cost of use, the membrane module structure adopts a commercially available inorganic heat-resistant membrane. The tubular membrane is a permeable tube in the inner cylinder of the reactor. According to the filtration requirements, it is divided into small holes of different pore sizes, mainly involving one or more of microfiltration, ultrafiltration and nanofiltration pores.

[0015] As a preferred embodiment, in order to facilitate the discharge of residue from the heat storage body, the heat storage body is disc-shaped, and a channel for the discharge of residue is provided between it and the outer cylinder.

[0016] As a preferred option, in order to better lock in the temperature, reduce the heating frequency, and reduce heat loss, the heat storage body is composed of a support plate and a heat storage block placed on the support platform. The heat storage block is made of one or more of silicon and aluminum materials, such as pebbles, gravel, or ceramic sheets.

[0017] This invention provides a high-solids-content wastewater treatment process that can realize the resource utilization of high-solids-content wastewater (the residue after the thermal reaction can be used as a resource), and the filtrate from the membrane module is discharged from the system in a timely manner. The heat storage body can maximize the utilization of thermal energy, fundamentally solving the problem of high energy consumption.

[0018] Compared to existing wastewater treatment devices on the market, the device of this invention has the following advantages:

[0019] 1. The treatment device of the present invention is simple. High solid wastewater is filtered through membrane modules, and the filtrate is discharged in time, reducing the energy consumption of the filtrate. At the same time, the heat storage body can store energy, which also greatly reduces the heating frequency and reduces heat loss.

[0020] 2. The membrane module is fixed to the inner cylinder of the reactor via flanges. The liquid inlet pipe and gas inlet pipe are also fixed to the membrane module via flanges. The filter material retained on the membrane module, i.e., large particles, is reduced in water content and subsequent thermal reaction energy consumption under the pressure and resonance of the gas inlet pipe. Moreover, after the valve is opened, it can be effectively separated from and discharged from the membrane module, falling onto the surface of the hot reaction platform to react. By oxidizing substances such as COD into harmless carbon dioxide and water, harmless and untreated substances are achieved. The gas after the reaction is directly discharged, reducing the disposal costs of subsequent products and saving costs.

[0021] 3. It is highly practical and has a wide range of applications. High-solids wastewater can meet discharge standards after treatment by the device, which reduces environmental pollution and energy consumption, and has high economic and social benefits. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0023] Figure 1 This is a schematic diagram of a high-solids-content wastewater treatment device according to an embodiment of the present invention;

[0024] In the diagram: 101-outer cylinder, 102-inner cylinder, 201-membrane module, 202-liquid inlet pipe, 203-air inlet pipe, 301-heating device, 401-heat storage body, 501-drain pipe, 601-exhaust port, 701-slag discharge port. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0026] In the description of this invention, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a flange connection; they can refer to a threaded connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0027] like Figure 1 As shown, this embodiment of the invention first provides a high-solids-content wastewater treatment device and method, wherein the device includes: an outer cylinder 101, an inner cylinder 102, a membrane module 201, an inlet pipe 201, a compressed air pipe 203, a heating device 301, a heat storage body 401, a drain pipe 501, an exhaust port 601, and a slag discharge port 701. The outer cylinder 101 provides the reaction site for the device and is made of stainless steel, preferably in the form of a vertical cylindrical tank. The inner cylinder 102 is designed inside the outer cylinder 101, and the membrane module 201 is fixed to the inner cylinder 102 by a flange. 2. The inlet pipe 202 and the compressed air pipe 203 are connected and fixed to the membrane module 201 by flanges. The membrane module 201 is tubular, preferably an inorganic heat-resistant membrane. The membrane module 201 is vertically fixed to the inlet pipe 202. A valve is provided at the lower end of the membrane module 201. A porous heat storage body 401 is provided below the valve. A heating device 301 is provided below the heat storage body 401. The heating device 301 can be one or a combination of electric heating, plasma, and natural gas. The heat storage body 401 can be one or a combination of silicon and aluminum materials.

[0028] The method includes the following steps:

[0029] 1) High solids wastewater is pumped into membrane module 201 through inlet pipe 202. The high solids wastewater is filtered through the tubular membrane module 201. One end of membrane module 201 is closed and connected to both inlet pipe 201 and compressed air pipe 203. The other end is closed through a valve.

[0030] 2) The filtration area on the side wall of the membrane module is sealed by the inner cylinder 102. Under the action of the membrane module 201, the large particles (filtered material) of the high solid content wastewater are intercepted after treatment, while the small molecule filtrate passes through the membrane module 201 and is discharged through the drain pipe 501.

[0031] 3) Large particles are trapped on the inner wall of membrane module 201. The valve of the membrane module is opened, and the filtered material is removed from the inner surface of the membrane module and blown out by pulsed air. In order to reduce the water content in the filtered material and reduce the waste of heat of the heat storage body by liquid evaporation during the thermal reaction, the filtered material in the membrane module is squeezed and drained by compressed air before opening the valve of the membrane module. The frequency of the pulsed air is the same as or similar to the natural frequency of the filtered material.

[0032] 4) The heating device 301 preheats the heat storage body 401. After the heat storage body 401 reaches the reaction temperature of the filtered material, the filtered material is received and heated to react. The heating temperature is not lower than 150℃. Large particles react to remove pollutants. The purified gas is discharged from the outer cylinder 101 through the exhaust port 601. The residue is discharged from the outer cylinder 101 through the slag discharge port 701. In order to better separate the residue from the heat storage body and drop it out, a compressed air pipe inlet is provided above the heat storage body 401. The residue is resonated and destroyed by pulsed gas with a frequency close to that of the residue, thereby peeling it off and discharging it.

[0033] To ensure the filtration efficiency of the membrane module and reduce the cost of use, the membrane module structure adopts a commercially available inorganic heat-resistant membrane. The tubular membrane has a permeable tube in the inner cylinder and is divided into small holes of different pore sizes according to filtration requirements, mainly involving one or more of the following: microfiltration, ultrafiltration, and nanofiltration pores.

[0034] Example 2

[0035] The structure and method of this embodiment are basically the same as those of embodiment 1. The main difference is in the construction of the heat storage body 401. The heat storage body is a disc 401 with a channel for slag discharge between it and the outer cylinder. The heat storage body is composed of a support plate and a heat storage block placed on the support platform. The heat storage block is one or more of silicon and aluminum materials. In this embodiment, a metal support plate and pebbles are selected.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can be modified and varied in various ways. For example, the pulse gas may be simply replaced with other high-pressure gases or a brush, or the structure of the heat storage body may be simplified or replaced. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A process for treating wastewater with high solids content, characterized in that... The steps include the following: 1) High solids wastewater is filtered through a tubular membrane module. One end of the membrane module is closed and connected to both the inlet pipe and the compressed air pipe, while the other end is closed through a valve. 2) The membrane module sidewall is sealed by an inner cylinder to receive the filtrate, and the inner cylinder is connected to a drain pipe; 3) Open the valve of the membrane module and blow out the filtered material from the inner surface of the membrane module by pulsed air. The frequency of the pulsed air is the same as or similar to the natural frequency of the filtered material. 4) The filter material is received and heated to react through the heat storage body. The heating temperature is not lower than 150℃. The gas generated by the reaction is collected through the outer cylinder and discharged through the exhaust port. The residue after the reaction is discharged through the slag discharge port. In step 3), before opening the valve of the membrane module, the filtered material inside the membrane module is squeezed and drained by compressed air; the membrane module is fixed to the inner cylinder by a flange; the inner cylinder is located inside the outer cylinder, and the outer cylinder provides a reaction site for the device; a porous heat storage body is provided below the valve, and a heating device is provided below the heat storage body.

2. The high-solids-content wastewater treatment process as described in claim 1, characterized in that: The heat storage body has a porous structure and a compressed air inlet is provided above it. The residue is stripped and discharged by pulsed gas with a frequency similar to that of the residue.

3. A high-solids-content wastewater treatment process as described in claim 1 or 2, characterized in that: The heat storage body is heated by one or a combination of electric heating, plasma, and natural gas.

4. The high-solids-content wastewater treatment process as described in claim 1, characterized in that: The membrane module is an inorganic heat-resistant membrane.

5. The high-solids-content wastewater treatment process as described in claim 2, characterized in that: The heat storage body is disc-shaped, and a channel for slag discharge is provided between it and the outer cylinder.

6. The high-solids-content wastewater treatment process as described in claim 5, characterized in that: The heat storage body consists of a support plate and a heat storage block placed on top of the support platform.

7. The high-solids-content wastewater treatment process as described in claim 6, characterized in that: The heat storage block is made of one or more of silicon and aluminum materials.

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