Cellulose ether wastewater treatment device
By combining pretreatment, biochemical and desalination systems, the problems of high salt, high COD and poor biodegradability of cellulose ether wastewater are solved, achieving efficient purification and resource recovery of wastewater and significantly improving the treatment effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG TIANSHENG FIBER CO LTD
- Filing Date
- 2025-06-28
- Publication Date
- 2026-05-29
AI Technical Summary
Cellulose ether wastewater is characterized by high salt content, high chemical oxygen demand (COD), and poor biodegradability, resulting in poor performance of traditional biological treatment methods, making it difficult to achieve discharge standards. Furthermore, conventional treatment methods are ineffective in removing complex organic matter and lead to significant resource waste.
The system employs a combination of a pretreatment system (sand filter and micro-electrolysis tank), a biological system (hydrolysis acidification tank, upflow anaerobic sludge bed reactor, sequential intermittent activated sludge tank and aerated biological filter), a desalination system (bipolar membrane system), and a recovery system. Through sand filtration, suspended solids and organic matter are removed; micro-electrolysis degrades organic matter; bipolar membranes convert inorganic salts into acid and alkali resources; and the biological system decomposes pollutants, ultimately achieving stable water quality compliance.
It significantly improves the biodegradability of wastewater, effectively removes suspended solids and organic matter, reduces salt interference, achieves resource recovery, and ensures that the effluent quality meets standards stably, thus solving the problem of cellulose ether wastewater treatment.
Smart Images
Figure CN224299073U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a cellulose ether wastewater treatment device. Background Technology
[0002] Against the backdrop of today's booming industrial production, cellulose ethers, as an important chemical raw material widely used in building materials, food, pharmaceuticals, chemicals, and many other fields, are experiencing continuous expansion in production scale. However, the resulting wastewater treatment problem of cellulose ethers has become a serious challenge restricting the sustainable development of the industry.
[0003] Cellulose ether wastewater exhibits distinct characteristics, characterized by high salinity, high chemical oxygen demand (COD), and poor biodegradability. Its high salinity strongly inhibits microbial activity, damaging the cell structure and function of microorganisms in the biological treatment system, hindering normal microbial metabolism, and making it difficult for microorganisms to survive and reproduce in such a harsh environment. This severely impacts the effectiveness of biological treatment, rendering traditional biological treatment processes ineffective. High COD concentrations indicate the presence of large amounts of complex and difficult-to-degrade organic matter in the wastewater, such as hemicellulose derivatives and cellulose ether products lost during production. These substances not only increase the difficulty of wastewater treatment but also result in high color, making them difficult to remove effectively using conventional methods. Furthermore, the poor biodegradability makes it difficult for pollutants in the wastewater to be decomposed and utilized by microorganisms, preventing efficient purification through conventional biological treatment methods.
[0004] Previously, while technologies such as micro-electrolysis, Fenton catalytic oxidation, ozone catalytic oxidation, UASB, IC, and contact oxidation have been researched and applied for the treatment of cellulose ether wastewater, they all have certain limitations. For example, micro-electrolysis alone suffers from poor reaction continuity and stability, making it difficult to meet the demands of large-scale industrial applications. While Fenton catalytic oxidation can degrade organic matter to some extent, it generates large amounts of secondary pollutants such as iron sludge, increasing the cost and difficulty of subsequent treatment. Traditional biological treatment processes, due to the high salinity and recalcitrant nature of the wastewater, easily inhibit microorganisms, significantly reducing treatment effectiveness and making it difficult to achieve compliant discharge. Furthermore, these traditional treatment methods often focus solely on pollutant removal, neglecting resource recovery and utilization, resulting in the waste of water resources and recyclable chemicals. Utility Model Content
[0005] To achieve the above objectives, this utility model provides the following technical solution: a cellulose ether wastewater treatment device, comprising a wastewater collection tank, a pretreatment system, a desalination system, a biochemical system, and a recovery system, wherein the pretreatment system is located at the rear end of the wastewater collection tank, the desalination system is located at the rear end of the pretreatment system, the biochemical system is located at the rear end of the desalination system, and the recovery system is located at the rear end of the biochemical system;
[0006] The pretreatment system includes a sand filtration device and a micro-electrolysis cell. The sand filtration device includes a filter tank, and the interior of the filter tank is provided with a gravel layer, a quartz sand layer and an activated carbon layer, which are arranged sequentially from bottom to top. The bottom of the filter tank is provided with a feed inlet and the top of the filter tank is provided with a discharge outlet.
[0007] Preferably, the micro-electrolysis cell is provided with iron-carbon micro-battery packing material, the micro-electrolysis cell is provided with an aeration device, and the inlet and outlet of the micro-electrolysis cell are respectively located at both ends of the micro-electrolysis cell and are arranged symmetrically.
[0008] Preferably, the biochemical system includes a hydrolysis acidification tank, an upflow anaerobic sludge bed reactor, a series of intermittent activated sludge tanks, and an aerated biological filter, and the hydrolysis acidification tank, the upflow anaerobic sludge bed reactor, the series of intermittent activated sludge tanks, and the aerated biological filter are connected in sequence through pipelines.
[0009] Preferably, the desalination system is a bipolar membrane system, which contains a salt chamber, an alkali chamber, and an acid chamber, and the salt chamber is connected to the biochemical system.
[0010] Preferably, the bipolar membrane system is further connected to a recovery system, which is connected to the acid chamber and the alkali chamber of the bipolar membrane system respectively.
[0011] Preferably, in the bipolar membrane system, the salt chamber is disposed on both sides of the alkali chamber and the acid chamber, and an anion exchange membrane is disposed between each pair of the acid chamber, salt chamber and alkali chamber.
[0012] Beneficial Effects: This utility model centers on a closed-loop process of "collection, pretreatment, desalination, biochemical treatment, and recovery," with each system interconnected and working synergistically. In the pretreatment stage, the sand filter and micro-electrolysis cell work together to effectively filter suspended solids and degrade organic matter, significantly improving the biodegradability of wastewater. The biochemical system decomposes pollutants layer by layer, ultimately achieving stable effluent quality that meets standards, providing a reliable guarantee for industrial wastewater purification. Addressing the challenges of high salinity and complex pollutants in cellulose ether wastewater, the device employs two innovative technologies. The bipolar membrane desalination system, through its unique salt, alkali, and acid chambers and anion exchange membrane design, converts inorganic salts into acid and alkali resources, eliminating interference from salt in biochemical treatment and achieving preliminary resource recovery. The iron-carbon micro-battery packing material, combined with an aeration device, utilizes electrochemical oxidation-reduction reactions to efficiently break down the stubborn structure of organic matter, significantly enhancing the feasibility of wastewater treatment and successfully overcoming the technical bottlenecks that traditional processes struggle to address. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0014] Figure 2 This is a diagram showing the internal structure of the filter tank of this utility model.
[0015] In the attached diagram: 1-Wastewater collection tank, 2-Pretreatment system, 201-Sand filter device, 2011-Filter tank, 2012-Gravel layer, 2013-Quartz sand layer, 2014-Activated carbon layer, 202-Micro electrolysis cell, 2021-Iron-carbon micro battery packing, 2022-Aeration device, 3-Desalination system, 301-Salt chamber, 302-Alkali chamber, 303-Acid chamber, 4-Biochemical system, 401-Hydrolysis acidification tank, 402-Upflow anaerobic sludge bed reactor, 403-Sequential intermittent activated sludge tank, 404-Aerated biological filter, 5-Recovery system. Detailed Implementation
[0016] The technical solution of this patent will be further described in detail below with reference to specific embodiments.
[0017] Example
[0018] Please refer to the accompanying drawings in the specification. In this embodiment of the present invention, a cellulose ether wastewater treatment device includes a wastewater collection tank 1, a pretreatment system 2, a desalination system 3, a biochemical system 4, and a recovery system 5. The pretreatment system 2 is located at the rear end of the wastewater collection tank 1, the desalination system 3 is located at the rear end of the pretreatment system 2, the biochemical system 4 is located at the rear end of the desalination system 3, and the recovery system 5 is located at the rear end of the biochemical system 4.
[0019] The pretreatment system 2 includes a sand filtration device 201 and a micro-electrolysis cell 202. The sand filtration device 201 includes a filter tank 2011, which contains a gravel layer 2012, a quartz sand layer 2013, and an activated carbon layer 2014 arranged sequentially from bottom to top. The bottom of the filter tank 2011 has an inlet, and the top of the filter tank 2011 has an outlet. The three-stage filtration of the gravel layer, quartz sand layer, and activated carbon layer can effectively remove suspended solids, colloids, and some organic matter from the wastewater, reduce the turbidity and color of the wastewater, and create conditions for subsequent treatment.
[0020] Specifically, the micro-electrolysis cell 202 is provided with iron-carbon micro-battery packing material 2021, and the micro-electrolysis cell 2021 is provided with an aeration device 2022. The inlet and outlet of the micro-electrolysis cell 2021 are respectively located at both ends of the micro-electrolysis cell 2021 and are arranged symmetrically.
[0021] Specifically, the biochemical system 4 includes a hydrolysis acidification tank 401, an upflow anaerobic sludge bed reactor 402, a sequential intermittent activated sludge tank 403, and an aerated biological filter 404. The hydrolysis acidification tank 401, the upflow anaerobic sludge bed reactor 402, the sequential intermittent activated sludge tank 403, and the aerated biological filter 404 are connected in sequence through pipelines. The hydrolysis acidification tank decomposes complex organic matter into small molecules. The upflow anaerobic sludge bed reactor degrades most of the organic matter through anaerobic microorganisms. The sequential intermittent activated sludge tank and the aerated biological filter further remove residual pollutants through aerobic treatment, resulting in strong water quality stability.
[0022] Specifically, the desalination system 3 is a bipolar membrane system, which internally includes a salt chamber 301, an alkali chamber 302, and an acid chamber 303. The salt chamber 301 is connected to the biochemical system 4. Through the design of the salt, alkali, and acid chambers, the bipolar membrane system utilizes anion exchange membranes to separate salts, converting inorganic salts in wastewater into acids and alkalis, effectively reducing the salinity of the wastewater and solving the problem of high-salinity wastewater inhibiting the biochemical system.
[0023] Specifically, the bipolar membrane system is also connected to a recovery system 5, which is connected to the acid chamber 303 and the alkali chamber 302 of the bipolar membrane system respectively.
[0024] Specifically, in the bipolar membrane system, the salt chamber 301 is disposed on both sides of the alkali chamber 302 and the acid chamber 303. Anion exchange membranes are disposed between each pair of the acid chamber 303, the salt chamber 301 and the alkali chamber 302. The salt chamber is disposed on both sides of the alkali chamber and the acid chamber. The separation by the anion exchange membrane shortens the ion migration path, improves the desalination efficiency and current utilization rate, and reduces energy consumption.
[0025] Working principle: Wastewater first flows into a wastewater collection tank for temporary storage and homogenization, and then enters the pretreatment system. In the sand filtration unit, wastewater enters from the bottom inlet of the filter tank and passes sequentially through a gravel layer, a quartz sand layer, and an activated carbon layer. The gravel layer intercepts larger suspended particles, the quartz sand layer further filters fine particulate impurities, and the activated carbon layer, with its rich porous structure and adsorption capacity, adsorbs and removes some organic matter, pigments, and odor substances, achieving preliminary purification.
[0026] Wastewater treated by sand filtration enters a micro-electrolysis tank. In this tank, iron-carbon micro-battery packing material forms numerous tiny galvanic cells under oxygen-supplying aeration. Iron acts as the anode, undergoing oxidation to produce ferrous ions, while carbon acts as the cathode, where dissolved oxygen and oxidizing substances in the wastewater gain electrons and are reduced. During this process, the electron flow and free radicals generated by the iron-carbon micro-batteries can disrupt the molecular structure of recalcitrant organic matter in the wastewater, breaking down large organic molecules into smaller ones. This simultaneously reduces the toxicity of the wastewater, improves its biodegradability, and lays the foundation for subsequent treatment.
[0027] The pretreated wastewater enters the desalination system, specifically the bipolar membrane system. The salt chamber of this system is connected to the biological treatment system. Under the influence of an electric field, inorganic salt ions in the wastewater migrate through the anion exchange membrane to the acid and alkali chambers, respectively. Anions migrate to the acid chamber and combine with hydrogen ions generated from water ionization to form acids, while cations migrate to the alkali chamber and combine with hydroxide ions generated from water ionization to form alkalis. This effectively removes salt from the wastewater, reduces its salt concentration, and eliminates the inhibitory effect of high salt on subsequent biological treatment. Simultaneously, the acids and alkalis generated in the acid and alkali chambers can be collected and reused through a recovery system, achieving resource conversion.
[0028] After desalination, the wastewater enters the biological treatment system, passing sequentially through a hydrolysis acidification tank, an upflow anaerobic sludge bed reactor, a series of intermittent activated sludge tanks, and an aerated biological filter. In the hydrolysis acidification tank, facultative microorganisms hydrolyze and ferment large organic molecules into smaller fatty acids, alcohols, and other substances, further improving the wastewater's biodegradability. In the upflow anaerobic sludge bed reactor, anaerobic microorganisms utilize the organic matter in the wastewater as a substrate, producing biogas through anaerobic fermentation, significantly removing organic matter from the wastewater. The series of intermittent activated sludge tanks operate intermittently, achieving organic matter degradation and sludge sedimentation and separation through multiple stages including influent, reaction, sedimentation, and effluent discharge. Finally, the aerated biological filter, through the metabolic action of aerobic microorganisms, further removes residual organic matter, ammonia nitrogen, and other pollutants, ensuring that the effluent meets quality standards.
[0029] In summary, this invention centers on a closed-loop process of "collection, pretreatment, desalination, biochemical treatment, and recovery," with each system interconnected and working synergistically. In the pretreatment stage, the sand filter and micro-electrolysis cell work together to effectively filter suspended solids and degrade organic matter, significantly improving the biodegradability of wastewater. The biochemical system decomposes pollutants layer by layer, ultimately achieving stable effluent quality that meets standards, providing a reliable guarantee for industrial wastewater purification. Addressing the challenges of high salinity and complex pollutants in cellulose ether wastewater, the device employs two innovative technologies. The bipolar membrane desalination system, through its unique salt, alkali, and acid chambers and anion exchange membrane design, converts inorganic salts into acid and alkali resources, eliminating interference from salt in biochemical treatment and achieving preliminary resource recovery. The iron-carbon micro-battery packing material, combined with an aeration device, utilizes electrochemical oxidation-reduction reactions to efficiently break down the stubborn structure of organic matter, significantly enhancing the feasibility of wastewater treatment and successfully overcoming the technical bottlenecks that traditional processes struggle to address.
[0030] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
Claims
1. A cellulose ether wastewater treatment device, characterized in that: It includes a wastewater collection tank (1), a pretreatment system (2), a desalination system (3), a biochemical system (4), and a recycling system (5). The pretreatment system (2) is located at the rear end of the wastewater collection tank (1), the desalination system (3) is located at the rear end of the pretreatment system (2), the biochemical system (4) is located at the rear end of the desalination system (3), and the recycling system (5) is located at the rear end of the biochemical system (4). The pretreatment system (2) includes a sand filter device (201) and a micro-electrolysis cell (202). The sand filter device (201) includes a filter tank (2011). The filter tank (2011) is provided with a gravel layer (2012), a quartz sand layer (2013) and an activated carbon layer (2014) inside. The gravel layer (2012), the quartz sand layer (2013) and the activated carbon layer (2014) are arranged sequentially from bottom to top. The bottom of the filter tank (2011) is provided with a feed inlet and the top of the filter tank (2011) is provided with a discharge outlet.
2. The cellulose ether wastewater treatment device according to claim 1, characterized in that: The micro-electrolysis cell (202) is equipped with iron-carbon micro-battery packing material (2021), and the micro-electrolysis cell (202) is equipped with an aeration device (2022). The inlet and outlet of the micro-electrolysis cell (202) are respectively located at both ends of the micro-electrolysis cell (202) and are arranged symmetrically.
3. The cellulose ether wastewater treatment device according to claim 1, characterized in that: The biochemical system (4) includes a hydrolysis acidification tank (401), an upflow anaerobic sludge bed reactor (402), a sequential intermittent activated sludge tank (403), and an aerated biological filter (404), and the hydrolysis acidification tank (401), the upflow anaerobic sludge bed reactor (402), the sequential intermittent activated sludge tank (403), and the aerated biological filter (404) are connected in sequence through pipelines.
4. The cellulose ether wastewater treatment device according to claim 1, characterized in that: The desalination system (3) is a bipolar membrane system, which contains a salt chamber (301), an alkali chamber (302) and an acid chamber (303). The salt chamber (301) is connected to the biochemical system (4).
5. The cellulose ether wastewater treatment device according to claim 4, characterized in that: The bipolar membrane system is also connected to a recovery system (5), which is connected to the acid chamber (303) and the alkali chamber (302) of the bipolar membrane system respectively.
6. The cellulose ether wastewater treatment device according to claim 4, characterized in that: In the bipolar membrane system, the salt chamber (301) is located on both sides of the alkali chamber (302) and the acid chamber (303), and anion exchange membranes are provided between each pair of the acid chamber (303), the salt chamber (301) and the alkali chamber (302).