A process for treating organic wastewater containing particulate pollutants

Abstract

This invention relates to a process for treating organic wastewater containing particulate pollutants. The process involves sedimentation and separation of organic wastewater to obtain primary organic wastewater. This primary organic wastewater is then treated in conjunction with ROS aeration and ultrasonic processes. This combination increases the active oxygen content of the primary organic wastewater. The cavitation bubbles generated by the ultrasonic waves break up suspended microparticles in the primary organic wastewater and initiate the initial oxidation of recalcitrant organic matter. Simultaneously, the bubbles generated by aeration enhance the ultrasonic cavitation effect, increasing the concentration of hydroxyl radicals in the primary organic wastewater and significantly improving its oxidizing power. This effectively pre-treats the organic wastewater and improves the water quality stability during the targeted biological purification stage. Consequently, when the resulting secondary organic wastewater undergoes targeted biological purification, the organic matter is rapidly degraded under the action of biological oxidation, reducing the amount of chemicals needed and lowering the operating costs of organic wastewater treatment.

Description

Technical Field

[0001] This invention relates to the field of organic wastewater treatment technology, and more specifically to a process for treating organic wastewater containing particulate pollutants. Background Technology

[0002] With the development of urban modernization, both industry and agriculture generate a large amount of organic wastewater. More and more recalcitrant organic pollutants are being discharged directly into the environment without treatment. Due to the toxicity and bioaccumulation of organic wastewater, it poses a huge threat to the survival and health of residents and seriously affects their living environment. Water pollution has become an urgent problem to be solved.

[0003] Existing organic wastewater treatment technologies are mainly divided into physical methods, biodegradation methods, and advanced oxidation methods. Physical methods are mainly divided into physical adsorption, membrane separation technology, and filtration. For example, physical adsorption mainly utilizes the material's own ability to adsorb organic pollutants, which is a low-cost and high-efficiency method to effectively transfer the target pollutants. However, it can only adsorb organic pollutants onto the medium and transport them through transfer, but it cannot effectively oxidize and decompose organic pollutants. Organic pollutants that are not completely degraded will still cause water pollution.

[0004] The core technology of biodegradation is the activated sludge process, which is an aerobic biological treatment method for wastewater. Activated sludge oxidation can effectively degrade highly soluble and colloidal organic pollutants in water. Activated sludge also has a certain adsorption capacity, which can effectively adsorb suspended residual colloidal particles in wastewater. At the same time, it can also effectively remove nitrogen and phosphorus pollutants and harmful microorganisms in domestic sewage. However, the activated sludge process has disadvantages such as poor shock resistance, unstable system operation, large sludge volume, long process, and high cost.

[0005] Advanced oxidation processes (AOPs) refer to chemical oxidation technologies that utilize highly reactive free radicals to indiscriminately attack organic pollutants. They primarily rely on materials and other auxiliary methods to synergistically generate highly oxidizing reactive free radicals. These highly reactive free radicals possess strong catalytic oxidation capabilities, enabling them to react efficiently and rapidly with target pollutants. Under the attack of multiphase free radicals, organic pollutants are ultimately decomposed into small molecule fragments, CO2, H2O, and O2. However, AOPs are costly to treat wastewater, require higher dosages, and cannot fully degrade all organic pollutants in wastewater. Summary of the Invention

[0006] Therefore, it is necessary to provide a process for treating organic wastewater containing particulate pollutants.

[0007] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A process for treating organic wastewater containing particulate pollutants, comprising the following steps:

[0008] Organic wastewater is separated by sedimentation to obtain primary organic wastewater;

[0009] The primary organic wastewater is subjected to ROS aeration treatment and simultaneous ultrasonic treatment to obtain secondary organic wastewater.

[0010] The secondary organic wastewater is subjected to targeted biological purification treatment to obtain pre-discharge wastewater.

[0011] In one embodiment, the ROS aeration treatment of the primary organic wastewater includes:

[0012] The primary organic wastewater is fed into a combined treatment tank and undergoes preliminary degradation under the aeration effect of the ROS microporous aeration membrane.

[0013] In one embodiment, the ultrasonic treatment of the primary organic wastewater includes:

[0014] The organic matter in the primary organic wastewater is degraded by the ultrasonic waves emitted by the ultrasonic generator.

[0015] In one embodiment, when the primary organic wastewater is subjected to ROS aeration treatment and ultrasonic treatment simultaneously, the aeration treatment and ultrasonic treatment time is controlled to be 20 min-60 min.

[0016] In one embodiment, the power of the ultrasonic wave is 4kW-7kW.

[0017] In one embodiment, the targeted biological purification treatment of the secondary organic wastewater includes:

[0018] The secondary organic wastewater is introduced into a directional biological purification tank, and a compound microbial agent is added to the secondary organic wastewater for biochemical degradation under the action of the compound microbial agent.

[0019] In one embodiment, the compound microbial agent includes: Bacillus subtilis, Bacillus belye, and Bacillus tropicalis.

[0020] In one embodiment, the ratio of Bacillus subtilis, Bacillus belyi, and Bacillus tropicalis is 3-7:3-5:1-5.

[0021] In one embodiment, when adding the compound microbial agent to the secondary organic wastewater, the inoculation amount of the compound microbial agent is 1%-5%.

[0022] In one embodiment, when the biochemical degradation is carried out under the action of the compound microbial agent, the biochemical degradation time is controlled to be 7h-14h.

[0023] The beneficial effects of this invention are as follows: This invention provides a process for treating organic wastewater containing particulate pollutants. First-grade organic wastewater is obtained through sedimentation and separation. This first-grade organic wastewater is then treated in conjunction with ROS aeration and ultrasonic processes. Under piezoelectric catalysis, ROS aeration releases a large amount of active oxygen into the first-grade organic wastewater, increasing its content. This active oxygen reacts with organic pollutants, causing oxidation-reduction reactions that degrade the pollutants into carbon dioxide and water. Furthermore, the cavitation bubbles generated by the ultrasonic waves break up suspended micro-particles in the first-grade organic wastewater. It also performs preliminary oxidation of recalcitrant organic matter. At the same time, the bubbles generated by aeration can enhance the ultrasonic cavitation effect, increase the concentration of hydroxyl radicals in the primary organic wastewater, greatly improve its strong oxidizing power, and effectively pretreat the organic wastewater. It efficiently reduces the COD value of the primary organic wastewater, improves the water quality stability of the targeted biological purification stage, and has high biodegradability. Therefore, when the secondary organic wastewater is subjected to targeted biological purification, the organic matter can be rapidly degraded under the action of biological oxidation, reducing the amount of chemicals required and lowering the operating cost of organic wastewater treatment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic flow diagram of an organic wastewater treatment process containing particulate pollutants according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of a combined processing pool according to an embodiment of the present invention;

[0027] Figure 3 An optical microscope image of Bacillus subtilis according to an embodiment of the present invention;

[0028] Figure 4 An optical microscope image of Bacillus belye according to an embodiment of the present invention;

[0029] Figure 5 This is an optical microscope image of Bacillus tropicalis according to an embodiment of the present invention. Detailed Implementation

[0030] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] In one embodiment, such as Figure 1 and Figure 2 As shown, a process for treating organic wastewater containing particulate pollutants includes the following steps:

[0033] Step 110: Sedimentation separation of organic wastewater to obtain primary organic wastewater.

[0034] In this embodiment, the collected organic wastewater is introduced into an equalization tank for preliminary sedimentation. The organic wastewater is wastewater from the cutting and forging industry, metallurgical industry, new energy industry, or graphite industry. This process can separate some particulate pollutants and adjust the water quality of the organic wastewater to obtain primary organic wastewater after preliminary treatment.

[0035] Step 120: The primary organic wastewater is subjected to ROS aeration treatment and ultrasonic treatment simultaneously to obtain secondary organic wastewater.

[0036] In this embodiment, primary organic wastewater from the equalization tank is introduced into the combined treatment tank. Aeration is then carried out via an aeration pump and aeration pipes to a ROS microporous aeration membrane. The ROS microporous aeration membrane is an active oxygen purification membrane made of PE (polyethylene), which has high porosity, a large specific surface area, low aeration resistance, near-zero pore size deformation, and resistance to acids, alkalis, and high salt concentrations. It can generate smaller bubbles, resulting in a higher bubble density per unit volume and more uniform bubble distribution, along with a high mass transfer coefficient. Under the action of the ROS microporous aeration membrane, active oxygen is generated due to piezoelectric catalysis. When water or air flows through the ROS microporous aeration membrane, the pressure causes a piezoelectric catalytic effect in the membrane, releasing active oxygen into the water. The bubbles contain a large number of highly active free radicals, and the ROS microporous aeration membrane is in an unbalanced state of opposite charges. When it comes into contact with organic pollutants, it can undergo an oxidation-reduction reaction, thus directly degrading the organic pollutants in primary organic wastewater into carbon dioxide and water. At the same time, it has a good flocculation effect on particulate matter and colloids in primary organic wastewater, enabling them to flocculate and precipitate, which is beneficial for the separation of different types of organic matter and allows for the initial degradation of organic matter.

[0037] In this embodiment, under the action of ultrasonic waves emitted by the ultrasonic generator, the organic matter in the primary organic wastewater can be further degraded. That is, by irradiating the primary organic wastewater with high-frequency ultrasonic waves, a certain number of cavitation bubbles can be generated in the primary organic wastewater. When the cavitation bubbles break, a local high temperature and high pressure environment is formed, and a local high concentration of highly active free radicals is generated. At the same time, strong shock waves and high-speed jets are also present. In this way, the mechanical effect of ultrasonic waves, high temperature thermal decomposition, and free radical oxidation can decompose the difficult-to-degrade large molecular organic pollutants into small molecular organic pollutants, and effectively degrade the organic matter in the primary organic wastewater.

[0038] It is worth noting that while ROS aeration is applied to primary organic wastewater, ultrasonic treatment is also performed simultaneously. The large number of bubbles generated by the ROS microporous aeration membrane further enhances the ultrasonic cavitation effect, thereby increasing the concentration of hydroxyl radicals in the primary organic wastewater and significantly improving its strong oxidizing power. The bursting of the increased ultrasonic cavitation bubbles can break up suspended microparticle pollutants in the primary organic wastewater. For example, the mixed system formed by carbon powder and oil can promote the separation of oil and carbon particles, causing the oil to float and significantly reducing the oil content in the wastewater. This can reduce the COD (Chemical Oxygen Demand) value of the primary organic wastewater. Hydroxyl radicals can also perform preliminary oxidation on recalcitrant organic matter, effectively pre-treating the organic wastewater, increasing dissolved oxygen content and bioavailability, improving water quality stability in the targeted biological purification stage, exhibiting high biodegradability, and reducing the harm caused by water quality fluctuations to microorganisms.

[0039] In one embodiment, when ROS aeration treatment is performed on primary organic wastewater and ultrasonic treatment is performed simultaneously, the aeration treatment and ultrasonic treatment time are controlled to be 20min-60min, and the ultrasonic power is 4kw-7kw, which can effectively pretreat particulate pollutants in primary organic wastewater, facilitating subsequent biodegradation.

[0040] In one embodiment, after treating the primary organic wastewater with ROS aeration and simultaneous ultrasonic treatment, the method further includes adding wastewater treatment agents to the primary organic wastewater. The wastewater treatment agents are PAC (Poly Aluminium Chloride) and PAM (Poly(acrylamide), which have good flocculation effects on particulate matter and colloids in the primary organic wastewater, and can further flocculate and precipitate particulate matter and colloids, thereby further degrading organic matter.

[0041] Step 130: The secondary organic wastewater is subjected to targeted biological purification treatment to obtain pre-discharge wastewater.

[0042] In this embodiment, the pretreated secondary organic wastewater is introduced into a directional biological purification tank. A compound bacterial agent is added to the secondary organic wastewater, and biochemical degradation occurs under the action of the compound bacterial agent. Microorganisms can rapidly grow and reproduce using the decomposed small molecules, and rapidly perform deep degradation of COD, ammonia nitrogen, total phosphorus, and total nitrogen. This reduces the amount of sludge produced and greatly improves the COD degradation rate, resulting in pre-discharge wastewater with a low COD value.

[0043] In one embodiment, such as Figure 3 , Figure 4 and Figure 5As shown, the compound microbial agent includes: Bacillus subtilis, Bacillus belyssus, and Bacillus tropicalis. Specifically, Bacillus subtilis is a Gram-positive, strictly aerobic, non-capsulated bacillus of the Bacillus genus. It has a strong ability to decompose organic matter, breaking down large, difficult-to-decompose molecules into usable small molecules. It can utilize proteins, various sugars, and starch to produce abundant, easily usable metabolites. Bacillus belyssus is a Gram-positive bacterium with good heat and acid / alkali resistance, adapting to various water quality environments. It can degrade organic matter under different conditions, playing a good flocculation role in organic matter and effectively adsorbing heavy metals in the aquatic environment. Bacillus tropicalis can degrade, absorb, and transform harmful substances in sludge through its own metabolic activities.

[0044] In one embodiment, during the biochemical degradation process under the action of the compound microbial agent, the biochemical degradation time is controlled to be 7-14 hours, the ratio of Bacillus subtilis, Bacillus belyceae, and Bacillus tropicalis is 3-7:3-5:1-5, the inoculation amount of the compound microbial agent is 1%-5%, and the three strains act as dominant microbial agents, which can play a synergistic role. When added to the directional biological purification tank, biofilm formation is faster and the degradation efficiency is higher.

[0045] Compared with the prior art, the present invention has at least the following advantages:

[0046] This invention provides a process for treating organic wastewater containing particulate pollutants. First-stage organic wastewater is obtained through sedimentation and separation. This first-stage organic wastewater is then treated in conjunction with ROS aeration and ultrasonic processes. Under piezoelectric catalysis, ROS aeration releases a large amount of active oxygen into the first-stage organic wastewater, increasing its content. This active oxygen reacts with organic pollutants, causing oxidation-reduction reactions that degrade the pollutants into carbon dioxide and water. The cavitation bubbles generated by the ultrasonic waves break up suspended microparticles in the first-stage organic wastewater and perform preliminary oxidation on recalcitrant organic matter. Simultaneously, the bubbles generated by aeration enhance the ultrasonic cavitation effect, increasing the concentration of hydroxyl radicals in the first-stage organic wastewater and significantly improving its oxidizing power. This process effectively pre-treats the organic wastewater, efficiently reducing its COD value and improving the water quality stability during the targeted biological purification stage. The wastewater exhibits high biodegradability, allowing for rapid degradation of organic matter during targeted biological purification of the resulting second-stage organic wastewater through biological oxidation. This reduces the amount of chemicals needed and lowers the operating costs of organic wastewater treatment.

[0047] The present invention will be further described below with reference to specific embodiments.

[0048] Example 1

[0049] A process for treating organic wastewater containing particulate pollutants includes the following steps:

[0050] The collected organic wastewater is fed into a regulating tank for preliminary sedimentation to obtain primary organic wastewater.

[0051] The primary organic wastewater in the equalization tank is introduced into the combined treatment tank, where it is treated with ROS aeration and simultaneously subjected to ultrasonic treatment. The aeration and ultrasonic treatment time is controlled to be 20 minutes, and the ultrasonic power is 4 kW, to obtain secondary organic wastewater.

[0052] The pretreated secondary organic wastewater is fed into a directional biological purification tank. A compound microbial agent is added to the secondary organic wastewater, and biochemical degradation occurs under the action of the compound microbial agent. The inoculum amount of the compound microbial agent is 1%, resulting in pre-discharge wastewater. The compound microbial agent comprises Bacillus subtilis, Bacillus belye, and Bacillus tropicalis, in a ratio of 5:3:5.

[0053] Example 2

[0054] A process for treating organic wastewater containing particulate pollutants includes the following steps:

[0055] The collected organic wastewater is fed into a regulating tank for preliminary sedimentation to obtain primary organic wastewater.

[0056] The primary organic wastewater in the equalization tank is introduced into the combined treatment tank, where it is treated with ROS aeration and simultaneously subjected to ultrasonic treatment. The aeration and ultrasonic treatment time is controlled at 40 minutes, and the ultrasonic power is 5 kW, to obtain secondary organic wastewater.

[0057] The pretreated secondary organic wastewater is fed into a directional biological purification tank. A compound microbial agent is added to the secondary organic wastewater, and biochemical degradation occurs under the action of the compound microbial agent. The inoculum amount of the compound microbial agent is 1%, resulting in pre-discharge wastewater. The compound microbial agent comprises Bacillus subtilis, Bacillus belye, and Bacillus tropicalis, in a ratio of 5:3:5.

[0058] Example 3

[0059] A process for treating organic wastewater containing particulate pollutants includes the following steps:

[0060] The collected organic wastewater is fed into a regulating tank for preliminary sedimentation to obtain primary organic wastewater.

[0061] The primary organic wastewater in the equalization tank is introduced into the combined treatment tank, where it is treated with ROS aeration and simultaneously subjected to ultrasonic treatment. The aeration and ultrasonic treatment time is controlled to be 60 minutes, and the ultrasonic power is 7 kW, to obtain secondary organic wastewater.

[0062] The pretreated secondary organic wastewater is fed into a directional biological purification tank. A compound microbial agent is added to the secondary organic wastewater, and biochemical degradation occurs under the action of the compound microbial agent. The inoculum amount of the compound microbial agent is 1%, resulting in pre-discharge wastewater. The compound microbial agent comprises Bacillus subtilis, Bacillus belye, and Bacillus tropicalis, in a ratio of 5:3:5.

[0063] Comparative Example 1

[0064] A process for treating organic wastewater containing particulate pollutants includes the following steps:

[0065] The collected organic wastewater is fed into a regulating tank for preliminary sedimentation to obtain primary organic wastewater.

[0066] The primary organic wastewater in the equalization tank is introduced into the combined treatment tank, where it is treated with ROS aeration for 60 minutes to obtain secondary organic wastewater.

[0067] Comparative Example 2

[0068] A process for treating organic wastewater containing particulate pollutants includes the following steps:

[0069] The collected organic wastewater is fed into a regulating tank for preliminary sedimentation to obtain primary organic wastewater.

[0070] The primary organic wastewater in the equalization tank is introduced into the combined treatment tank, where it is subjected to ultrasonic treatment for 60 minutes at a power of 7 kW to obtain secondary organic wastewater.

[0071] In Examples 1-3, the primary organic wastewater from the equalization tank was introduced into the combined treatment tank. The primary organic wastewater underwent ROS aeration treatment and simultaneous ultrasonic treatment. Then, wastewater treatment agents, PAC and PAM, were added to the primary organic wastewater to flocculate the particulate matter and colloids in the wastewater. The COD values ​​of the treated organic wastewater obtained in Examples 1-3 and Comparative Examples 1-2 were measured.

[0072] Table 1. Results of COD Measurement of Organic Wastewater

[0073]

[0074] As shown in Table 1, the organic wastewater treatment process containing particulate pollutants proposed in this application can effectively degrade various organic pollutants in the organic wastewater and rapidly degrade organic matter in the organic wastewater, greatly improving the COD degradation rate, reducing the amount of chemicals added, and lowering the operating cost of organic wastewater treatment.

[0075] COD degradation rate test of bacterial strain

[0076] Example 4

[0077] After culturing individual bacterial strains in liquid, the bacterial solutions were prepared into 10... 8 CFU / mL bacterial solutions were mixed into mixed bacterial solutions in different proportions. The ratio of Bacillus subtilis, Bacillus belyssus, and Bacillus tropicalis (v:v:v) was 4:3:2. The mixed bacterial solutions were then inoculated into 200mL of sterile organic wastewater at an inoculation rate of 1%. After mixing evenly, the mixture was shaken at 30℃ and a shaking rate of 150r / m for 7h and 14h, and samples were taken to detect their COD values.

[0078] Example 5

[0079] After culturing individual bacterial strains in liquid, the bacterial solutions were prepared into 10... 8 CFU / mL bacterial solutions were mixed into mixed bacterial solutions in different proportions. The ratio of Bacillus subtilis, Bacillus belyssus, and Bacillus tropicalis (v:v:v) was 3:4:3. The mixed bacterial solutions were then inoculated into 200mL of sterile organic wastewater at an inoculation rate of 1%. After mixing evenly, the mixture was shaken at 30℃ and a shaking rate of 150r / m for 7h and 14h, and samples were taken to detect their COD values.

[0080] Example 6

[0081] After culturing individual bacterial strains in liquid, the bacterial solutions were prepared into 10... 8 CFU / mL bacterial solutions were mixed into mixed bacterial solutions in different proportions. The ratio of Bacillus subtilis, Bacillus belye, and Bacillus tropicalis (v:v:v) was 5:4:2. The mixed bacterial solutions were then inoculated into 200mL of sterile organic wastewater at an inoculation rate of 1%. After mixing evenly, the mixture was shaken at 30℃ and a shaking rate of 150r / m for 7h and 14h, and samples were taken to detect their COD values.

[0082] Comparative Example 3

[0083] After culturing a single Bacillus subtilis strain in liquid, the bacterial solution was prepared into 10... 8The bacterial solution was prepared at CFU / mL and then inoculated into 200mL of sterile organic wastewater at an inoculation rate of 1%. The mixture was thoroughly mixed and shaken at 30℃ for 7h and 14h. Samples were then taken to test the COD value.

[0084] Comparative Example 4

[0085] After culturing a single strain of Bacillus belye in liquid culture, the bacterial solution was prepared into 10... 8 The bacterial solution was prepared at CFU / mL and then inoculated into 200mL of sterile organic wastewater at an inoculation rate of 1%. The mixture was thoroughly mixed and shaken at 30℃ for 7h and 14h. Samples were then taken to test the COD value.

[0086] Comparative Example 5

[0087] After culturing a single strain of Bacillus tropicalis in liquid, the bacterial solution was prepared into 10... 8 The bacterial solution was prepared at CFU / mL and then inoculated into 200mL of sterile organic wastewater at an inoculation rate of 1%. The mixture was thoroughly mixed and shaken at 30℃ for 7h and 14h. Samples were then taken to test the COD value.

[0088] The COD values ​​of the treated organic wastewater obtained in Examples 4-6 and Comparative Examples 3-5 were measured.

[0089] Table 2. Results of COD Measurement for Organic Wastewater

[0090] project 7hCOD degradation rate % 14h COD degradation rate % Example 4 75.3 87.6 Example 5 72.9 85.8 Example 6 73.4 83.2 Comparative Example 3 40.2 41.4 Comparative Example 4 41.5 56.3 Comparative Example 5 40.4 49.6

[0091] According to the data in Table 2, the compound bacterial agent in the organic wastewater treatment process containing particulate pollutants in this application has three dominant bacterial strains that can play a synergistic role. When added to the directional biological purification tank, the biofilm forms faster and the degradation efficiency is higher.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementations of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A process for the treatment of organic waste water containing particulate contaminants, characterized in that, The method comprises the following steps: carrying out sedimentation separation on organic wastewater to obtain primary organic wastewater; carrying out ROS aeration treatment on the primary organic wastewater and simultaneously carrying out ultrasonic treatment to obtain secondary organic wastewater; carrying out directional biological purification treatment on the secondary organic wastewater to obtain pre-discharge wastewater; wherein, when carrying out directional biological purification treatment on the secondary organic wastewater, the method comprises: introducing the secondary organic wastewater into a directional biological purification tank, adding a composite microbial agent to the secondary organic wastewater, and carrying out biochemical degradation under the action of the composite microbial agent, the composite microbial agent comprising Bacillus subtilis, B. velezensis and B. tropicus, and the ratio among the Bacillus subtilis, the B. velezensis and the B. tropicus being 3-7:3-5:1-5.

2. The particulate-contaminated organic wastewater treatment process of claim 1, wherein when carrying out ROS aeration treatment on the primary organic wastewater, the method comprises: introducing the primary organic wastewater into a combined treatment tank, and carrying out preliminary degradation under the aeration action of a ROS microporous aeration membrane.

3. The particulate-contaminated organic wastewater treatment process of claim 2, wherein, when carrying out ultrasonic treatment on the primary organic wastewater, the method comprises: degrading organic matters in the primary organic wastewater under the action of ultrasonic waves generated by an ultrasonic wave generating device.

4. The particulate-contaminated organic wastewater treatment process of claim 3, wherein, when carrying out ROS aeration treatment and simultaneously carrying out ultrasonic treatment on the primary organic wastewater, the aeration treatment and ultrasonic treatment time is controlled to be 20 min-60 min.

5. The particulate-contaminated organic wastewater treatment process of claim 3, wherein, the power of the ultrasonic waves is 4 kw-7 kw.

6. The particulate-contaminated organic wastewater treatment process of claim 1, wherein, when adding the composite microbial agent to the secondary organic wastewater, the inoculation amount of the composite microbial agent is 1%-5%.

7. The particulate-contaminated organic wastewater treatment process of claim 6, wherein, when carrying out biochemical degradation under the action of the composite microbial agent, the biochemical degradation time is controlled to be 7 h-14 h.

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