A wastewater treatment process for flatbed truck processing

Abstract

The application relates to the technical field of wastewater treatment, in particular to a wastewater treatment process for flat car machining. The wastewater treatment process for flat car machining comprises a silanization adjusting pool, an oil separation pool, a first-stage coagulation sedimentation pool, a second-stage coagulation sedimentation pool, an intermediate pool, an activated carbon filter and a recycled water pool which are sequentially connected; the wastewater treatment agent I and the wastewater treatment agent II used in the first-stage coagulation sedimentation pool and the second-stage coagulation sedimentation pool in sequence each comprises, by weight of per ton of wastewater, 10-15 g of calcium chloride, 20-40 g of PAC and 15-25 g of a fibrous zeolite xanthan gum composition; the fibrous zeolite xanthan gum composition improves the adsorption probability of the wastewater treatment agent I and the wastewater treatment agent II on heavy metals, petroleum substances and reducing substances, improves the purification effect on wastewater, reduces the use amount of polyaluminum chloride (PAC) and polyacrylamide (PAM) in wastewater treatment, saves the cost and is more friendly to the environment.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a wastewater treatment process for flatbed truck processing. Background Technology

[0002] In machining production, silanization is a novel surface treatment technology that uses an aqueous solution of organosilane as the main component to treat the surface of metallic or non-metallic materials. The cleaning wastewater generated from silane treatment typically contains organic matter, suspended solids, small amounts of fluorides, and heavy metals, posing a certain degree of environmental harm.

[0003] Currently, the treatment of cleaning wastewater generated from silane processing generally employs flocculants such as polyaluminum chloride (PAC) and polyacrylamide (PAM). However, PAC and PAM are not only costly to produce, but excessive use can also have environmental or human health impacts. Therefore, how to reduce the amount of PAC and PAM used in wastewater treatment, while simultaneously using more environmentally friendly flocculants to improve wastewater purification efficiency, has become a long-term research topic in the field of wastewater treatment technology. Summary of the Invention

[0004] In order to improve the environmental friendliness of existing flocculants and enhance the purification effect of industrial wastewater, this application provides a wastewater treatment process for flatbed truck processing.

[0005] This application provides a wastewater treatment process for flatbed truck processing.

[0006] A wastewater treatment process for flatbed truck processing includes a silanization equalization tank, an oil separator, a primary coagulation sedimentation tank, a secondary coagulation sedimentation tank, an intermediate water tank, an activated carbon filter, and a recycled water tank connected in sequence. The primary coagulation sedimentation tank and the secondary coagulation sedimentation tank are used to treat the wastewater in sequence with wastewater treatment agent I and wastewater treatment agent II. Each of the wastewater treatment agents I and II, based on the weight of each ton of wastewater, includes a composition of 10-15g calcium chloride, 20-40g PAC, and 15-25g fiber zeolite xanthan gum.

[0007] By adopting the above technical solution, a fiber zeolite xanthan gum composition is used, comprising textile fibers, zeolite, and xanthan gum. The amino and carboxyl groups in xanthan gum effectively adsorb and remove anions and cations from wastewater. Xanthan gum also exhibits good acid and alkali resistance and can form a high-viscosity pseudoplastic solution. When used in combination with plant fibers and zeolite, xanthan gum forms a complex with plant fibers, zeolite, PAC, and heavy metals, petroleum substances, and reducing agents in the water. Due to the presence of plant fibers, this complex is more easily suspended in water, increasing the contact probability between the complex and the adsorbed heavy metals, petroleum substances, and reducing agents. This enhances the adsorption rate of xanthan gum, plant fibers, and zeolite, as well as the purification effect on wastewater. Simultaneously, it reduces the amount of polyaluminum chloride (PAC) and polyacrylamide (PAM) used in wastewater treatment, saving costs and being more environmentally friendly.

[0008] Preferably, the wastewater treatment agent I further includes 10-15g of sodium hydroxide and 2-4g of PAM.

[0009] By adopting the above technical solutions, sodium hydroxide enhances the hydrolysis of polyaluminum chloride (PAC) and improves its purification effect, while precipitating and eliminating heavy metal ions in the water; PAM causes PAC containing complexed heavy metals, petroleum substances, and reducing substances to flocculate and settle, thereby purifying the wastewater.

[0010] Preferably, the wastewater treatment agent I is added in the following order per ton of wastewater: sodium hydroxide, calcium chloride, PAC, PAM, and a cellulose zeolite xanthan gum composition.

[0011] By adopting the above technical solution, the fiber zeolite xanthan gum composition is added last in the process of adding wastewater treatment agent I, which further enhances the purification effect of wastewater treatment agent I on wastewater.

[0012] Preferably, the wastewater treatment agent II is added in the following order: sodium hydroxide, calcium chloride, PAC, and a cellulose zeolite xanthan gum composition.

[0013] By adopting the above technical solution, the fiber zeolite xanthan gum composition is added last in the process of adding wastewater treatment agent II, which further improves the purification effect of wastewater treatment agent II on wastewater.

[0014] Preferably, both the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank are equipped with a stirring device, and the stirring speed of the stirring device is 7-12 r / min.

[0015] By adopting the above technical solution, and by setting up stirring devices in the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank, and by using a combination of fiber zeolite xanthan gum, the probability of wastewater treatment agent I and wastewater treatment agent II adsorbing and contacting heavy metals, petroleum substances and reducing substances is increased, thereby improving the purification effect on wastewater.

[0016] Preferably, the raw materials of the fiber zeolite xanthan gum composition include 1-3 parts by weight of plant fiber, 15-20 parts by weight of zeolite precursor solution, and 8-15 parts by weight of xanthan gum. The preparation process of the fiber zeolite xanthan gum composition is as follows:

[0017] S1: To prepare a zeolite precursor solution, the starting materials are composed of the following molar ratio: 3Na2O:Al2O3:2SiO2:120H2O, and the zeolite precursor solution is prepared by mixing them.

[0018] S2: After mixing the plant fiber with the zeolite precursor solution evenly, heat-treat at 80-150℃ for 20-30h to prepare zeolite fiber.

[0019] S3: Mix zeolite fibers and xanthan gum evenly to prepare a fiber zeolite xanthan gum composition.

[0020] By adopting the above technical solution, zeolite is generated in situ on plant fibers. The plant fibers and zeolite have a good bonding force, enhancing the purification effect of wastewater treatment agents I and II on wastewater. Plant fibers are lighter than water and easily float on wastewater, while zeolite is denser than water and easily sinks to the bottom. The combination of zeolite and plant fibers allows the zeolite fibers to tumble more effectively in the wastewater under the action of the stirring device. This increases the probability of wastewater treatment agents I and II adsorbing and contacting heavy metals, petroleum substances, and reducing agents, thereby improving the purification effect on wastewater.

[0021] Preferably, the plant fiber is bamboo fiber or hemp fiber.

[0022] By adopting the above technical solution, plant fibers with better adsorption performance and better binding force with zeolite are selected. The good binding force between zeolite and plant fibers makes them less likely to fall off during wastewater treatment, thereby improving the purification effect of wastewater treatment agent I and wastewater treatment agent II on wastewater.

[0023] Preferably, the fibrous zeolite xanthan gum composition further includes 5-10 parts by weight of chitosan, which is added in step S3.

[0024] By adopting the above technical solution, chitosan and xanthan gum are used together to form a large complex, which enhances the capture effect of heavy metals, petroleum substances and reducing substances, thereby improving the adsorption and removal effect of heavy metals, petroleum substances and reducing substances in wastewater.

[0025] Preferably, the fibrous zeolite xanthan gum composition further includes 4-8 parts by weight of phytic acid, which is added in step S3.

[0026] By adopting the above technical solution, phytic acid is used to improve the solubility of chitosan in water, further enhancing the complexation effect between chitosan and xanthan gum, thereby improving the removal rates of heavy metals, petroleum substances, and COD of wastewater treatment agents I and II.

[0027] Preferably, the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank are connected to the silanization sludge tank; the activated carbon filter is connected to the intermediate water tank through a water filtration pump; the silanization sludge tank is connected to a plate and frame filter press, which is connected to the silanization sludge tank through a sludge pump.

[0028] By adopting the above technical solution, the treated wastewater and sludge are separated, enabling the wastewater treatment process of flatbed truck processing to be implemented continuously, thereby improving the wastewater treatment effect.

[0029] In summary, this application has the following beneficial effects:

[0030] 1. In a wastewater treatment process for flatbed truck processing, wastewater treatment agent I and wastewater treatment agent II are formulated with a combination of calcium chloride, PAC fiber zeolite xanthan gum, and textile fiber zeolite xanthan gum. The textile fiber zeolite xanthan gum composition includes textile fibers, zeolite, and xanthan gum. The textile fiber zeolite xanthan gum composition increases the probability of contact and adsorption of heavy metals, petroleum substances, and reducing substances by wastewater treatment agent I and wastewater treatment agent II, thereby improving the purification effect of wastewater treatment agent I and wastewater treatment agent II on wastewater.

[0031] 2. The fiber zeolite xanthan gum composition also includes phytic acid and chitosan. Chitosan, phytic acid and xanthan gum are used together to form a large complex. Phytic acid improves the compatibility of chitosan and xanthan gum, enhances the capture effect of heavy metals, petroleum substances and reducing substances, and thus improves the adsorption and removal effect of heavy metals, petroleum substances and reducing substances in wastewater.

[0032] 3. Agitators are installed in the primary and secondary coagulation sedimentation tanks, with the agitator speed set to 7-12 r / min. Furthermore, a fiber zeolite xanthan gum composition is added last during the addition of wastewater treatment agent I and wastewater treatment agent II to further enhance their purification effect on wastewater. Attached Figure Description

[0033] Figure 1 This is a flowchart of the wastewater treatment process for flatbed truck processing in Example 1. Detailed Implementation

[0034] Hemp fiber (particle size 0.1-0.5mm), bamboo fiber (particle size 0.1-0.5mm), polyaluminum chloride (PAC) (content 28%, mesh size 100, basicity 40-90, pH value 3.5-5.0), polyacrylamide (PAM) (mesh size 200, active ingredient content 99%), xanthan gum (active substance content 99%, viscosity 1200-1700cps), gelatin (content 99%, food grade), chitosan (average molecular weight 320,000, degree of substitution 85%), phytic acid (active ingredient content 99%, food grade).

[0035] Preparation Example 1: A fibrous zeolite xanthan gum composition, using the raw materials listed in Table 1, and its preparation process is as follows:

[0036] S1: To prepare a zeolite precursor solution, the starting materials are composed of the following molar ratio: 3Na2O:Al2O3:2SiO2:120H2O, and the zeolite precursor solution is prepared by mixing them.

[0037] S2: After mixing hemp fiber with zeolite precursor solution evenly, heat-treat at 100℃ for 30h to prepare zeolite fiber.

[0038] S3: The zeolite fiber is mixed evenly with xanthan gum, chitosan and humic acid to prepare the fiber zeolite xanthan gum composition.

[0039] Preparation Examples 2 to 3 are fibrous zeolite xanthan gum compositions that differ from Preparation Example 1 in that the types and weights of raw materials used and the preparation process parameters are different, as detailed in Table 1.

[0040] Table 1. List of raw material types, weights, and process parameters for the fiber zeolite xanthan gum compositions in Examples 1-3.

[0041]

[0042] Preparation Example 4: A fibrous zeolite xanthan gum composition, which differs from Preparation Example 1 in that it does not use 8.

[0043] Preparation Example 5: A fibrous zeolite xanthan gum composition, which differs from Preparation Example 1 in that phytic acid is not used.

[0044] Preparation Example 6: A fibrous zeolite xanthan gum composition, which differs from Preparation Example 1 in that it does not use phytic acid and chitosan.

[0045] Preparation Example 7: A fibrous zeolite xanthan gum composition, which differs from Preparation Example 1 in that the amount of xanthan gum used is 20 kg, the amount of chitosan used is 12 kg, and the amount of phytic acid used is 2 kg.

[0046] Preparation Example 8: A fibrous zeolite xanthan gum composition, which differs from Preparation Example 1 in that the amount of xanthan gum used is 5 kg, the amount of chitosan used is 3 kg, and the amount of phytic acid used is 10 kg.

[0047] Preparation Example 9, a wastewater treatment process for flatbed truck processing, differs from Preparation Example 1 in that gelatin is used to replace xanthan gum in an equal amount; citric acid is used to replace phytic acid in an equal amount; and cotton fiber is used to replace bamboo fiber in an equal amount.

[0048] Preparation Example 10: A fiber zeolite xanthan gum composition, which differs from Preparation Example 1 in that the zeolite precursor solution is 25 kg and the S2 mixing time is 40 h.

[0049] Preparation Example 11, a fiber zeolite xanthan gum composition, differs from Preparation Example 1 in that the zeolite precursor solution is 10 kg and the S2 mixing time is 10 h.

[0050] Preparation Example 12, a fiber zeolite xanthan gum composition, differs from Preparation Example 1 in that 4A zeolite powder (particle size 325 mesh) is used in an equal amount to replace the zeolite precursor solution.

[0051] Preparation Example 13, a fiber zeolite xanthan gum composition, differs from Preparation Example 1 in that bamboo fiber is used to replace the zeolite precursor solution in an equal amount.

[0052] Example

[0053] Example 1: A wastewater treatment process for flatbed truck processing. The raw materials for wastewater treatment agent I and wastewater treatment agent II are shown in Table 2. Specific treatment processes are described in detail below. Figure 1 Specifically, the wastewater is treated sequentially through a silanization equalization tank, an oil separator, a primary coagulation sedimentation tank, a secondary coagulation sedimentation tank, an intermediate water tank, an activated carbon filter, and a reclaimed water tank.

[0054] The primary coagulation sedimentation tank and the secondary coagulation sedimentation tank are connected to the silanization sludge tank; the activated carbon filter is connected to the intermediate water tank through a water pump; the silanization sludge tank is connected to a plate and frame filter press, which is connected to the silanization sludge tank through a sludge pump.

[0055] The primary and secondary coagulation sedimentation tanks are treated with wastewater treatment agent I and wastewater treatment agent II in sequence. The order of addition for wastewater treatment agent I is as follows: sodium hydroxide, calcium chloride, PAC, PAM, and a fiber zeolite xanthan gum composition. The order of addition for wastewater treatment agent II is as follows: sodium hydroxide, calcium chloride, PAC, and finally the fiber zeolite xanthan gum composition.

[0056] The silanization equalization tank has a hydraulic retention time of 10±2 hours and is equipped with an air agitator to uniformly distribute the water quality and quantity, with an air agitation intensity of 2 m. 3 / (m 2 •h); The wastewater retention time in the oil separator is 5 minutes, and the average flow velocity of the water is 4 m / s.

[0057] The wastewater in the primary coagulation sedimentation tank is retained for 1.2 hours and is equipped with an impeller with a stirring speed of 7 r / min; the wastewater in the secondary coagulation sedimentation tank is retained for 50 minutes and is also equipped with an impeller with a stirring speed of 7 r / min; the activated carbon filter has a filtration rate of 6 ± 2 m / h.

[0058] Examples 2-3 describe a wastewater treatment process for flatbed truck processing. The difference between this process and Example 1 lies in the types, weights, and processing techniques of the raw materials for wastewater treatment agent I and wastewater treatment agent II. The specific dosages of wastewater treatment agent I and wastewater treatment agent II per ton of wastewater are shown in Table 2.

[0059] Table 2 lists the raw material types, weights, and treatment process settings for wastewater treatment agents I and II in the wastewater treatment processes of flatbed truck processing in Examples 1-3.

[0060]

[0061] Examples 4-13 describe a wastewater treatment process for flatbed truck processing. The difference from Example 1 is that the fiber zeolite xanthan gum composition used in Examples 4-13 is adopted sequentially.

[0062] Example 14, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that sodium hydroxide is not used in wastewater treatment agent I.

[0063] Example 15, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that the stirring speed in the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank is set to 15 r / min.

[0064] Example 16, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that no stirring device is installed in the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank.

[0065] Example 17, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that the stirring speed in the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank is set to 4 r / min; the order of adding wastewater treatment agent I is sodium hydroxide, calcium chloride, fiber zeolite xanthan gum composition, PAC, PAM; the order of adding wastewater treatment agent II is sodium hydroxide, calcium chloride, fiber zeolite xanthan gum composition, PAC.

[0066] Example 18, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that the stirring speed in the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank is set to 20 r / min; the order of adding wastewater treatment agent I is sodium hydroxide, calcium chloride, fiber zeolite xanthan gum composition, PAC, PAM; the order of adding wastewater treatment agent II is sodium hydroxide, calcium chloride, fiber zeolite xanthan gum composition, PAC.

[0067] Comparative Example 1, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that PAC is used to replace the fiber zeolite xanthan gum composition in equal amounts.

[0068] Comparative Example 2, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that PAM is used to replace the fiber zeolite xanthan gum composition in equal amounts.

[0069] Comparative Example 3, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that PAC is used to replace the fiber zeolite xanthan gum composition in equal amounts; and no stirring device is installed in the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank.

[0070] Comparative Example 4, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that PAM is used to replace the fiber zeolite xanthan gum composition in equal amounts; and no stirring device is installed in the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank.

[0071] Comparative Example 5, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that PAC is used to replace the fiber zeolite xanthan gum composition in equal amounts; and the stirring speed in the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank is set to 4 r / min.

[0072] Comparative Example 6, a wastewater treatment process for flatbed truck processing, differs from Example 1 in that PAM is used to replace the fiber zeolite xanthan gum composition in equal amounts; and the stirring speed in the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank is set to 15 r / min.

[0073] Experiment 1: Heavy metal removal rate

[0074] Before and after treatment of silanization washing wastewater, the wastewater was completely mixed and allowed to settle for 30 minutes. The supernatant was then taken, and the concentration of heavy metal ions in the wastewater was determined using an atomic absorption spectrophotometer to calculate the removal rate.

[0075] Experiment 2: Removal rate of petroleum substances

[0076] Before and after treatment, the silanized water washing wastewater was completely mixed and allowed to settle for 30 minutes. The supernatant was then taken and the concentration of petroleum substances in the wastewater before and after treatment was detected by fluorescence spectrophotometry, and the removal rate was calculated.

[0077] Experiment 3: Chemical Oxygen Demand (COD) Removal Rate

[0078] According to HJ / T 399-2007, the COD of wastewater before and after treatment is detected using a COD detector, and the COD removal rate is calculated.

[0079] Before treatment, the COD in the silanization washing wastewater was 500 mg / L, petroleum hydrocarbons 10 mg / L, As 0.2 mg / L, Cd 2 mg / L, and Zn 8 mg / L.

[0080] Test samples: The silanized water washing wastewater before and after treatment using the wastewater treatment process of flatbed car processing in Examples 1-18 was used as the example samples; the silanized water washing wastewater before and after treatment using the wastewater treatment process of flatbed car processing in Comparative Examples 1-6 was used as the comparative example samples.

[0081] Experimental results: The heavy metal removal rate, petroleum substance removal rate and COD removal rate of the silanization washing wastewater after treatment using the wastewater treatment process of flatbed truck processing in Examples 1-18 and Comparative Examples 1-6 are shown in Table 3.

[0082] Table 3. List of test results for heavy metal removal rate, petroleum substance removal rate, and COD removal rate of silanization washing wastewater after treatment using the wastewater treatment process of flatbed car processing in Examples 1-18 and Comparative Examples 1-6.

[0083] Combining Examples 1-18 and Comparative Examples 1-6, it can be seen that the heavy metal removal rate, petroleum substance removal rate, and COD removal rate of Examples 1-18 are better than those of Comparative Examples 1-6. This indicates that in the wastewater treatment process of flatbed truck processing, the use of fiber zeolite xanthan gum composition in wastewater treatment agents I and II can not only reduce the amount of PAC and PAM, but also improve the purification effect on wastewater. Further optimization of the stirring speed of the agitator in the primary and secondary coagulation sedimentation tanks and the order of raw material addition during the feeding process of wastewater treatment agents I and II increases the probability of adsorption and contact of heavy metals, petroleum substances, and reducing substances by wastewater treatment agents I and II, thereby improving the purification effect of wastewater treatment agents I and wastewater treatment agents II on wastewater.

[0084] As can be seen from Examples 1-6, the heavy metal removal rate, petroleum substance removal rate, and COD removal rate of Examples 1-3 are better than those of Examples 4-6. This indicates that the use of phytic acid and chitosan in the raw materials of the fiber zeolite xanthan gum composition further enhances the purification effect of wastewater treatment agents I and II on wastewater. This may be because chitosan contains more hydroxyl and amino groups, which have a good adsorption and chelation effect on heavy metals and polar organic matter. The amino and carboxyl groups in xanthan gum have a good adsorption and removal effect on anions and cations in wastewater, and xanthan gum has good acid and alkali resistance. Furthermore, it can form a high-viscosity pseudoplastic solution; when chitosan is used in combination with other chitosan, it forms a large complex, which enhances the capture effect of heavy metals, petroleum substances and reducing substances, and improves the purification performance of wastewater; phytic acid not only improves the solubility of chitosan in water, but also further enhances the complexing effect between chitosan and xanthan gum; thus, it improves the removal rate of heavy metals, petroleum substances and COD of wastewater by wastewater treatment agents I and II, thereby using less PAC and PAM, saving costs and improving the wastewater purification effect.

[0085] As can be seen from Examples 1-3 and Examples 7-8, the heavy metal removal rate, petroleum substance removal rate and COD removal rate of Examples 1-3 are better than those of Examples 7-8, indicating that the combination of 8-15 parts by weight of xanthan gum, 5-10 parts by weight of chitosan and 4-8 parts by weight of phytic acid has a better compatibility effect.

[0086] The reasons for this may be as follows: when the content of phytic acid is low and the content of xanthan gum and chitosan is high, the low content of phytic acid affects the solubility of chitosan, and the compatibility effect of chitosan and xanthan gum decreases; when the content of phytic acid is high and the content of xanthan gum and chitosan is relatively low, the stability of xanthan gum decreases and it decomposes, which in turn reduces the compatibility effect of phytic acid, chitosan and xanthan gum, resulting in a decrease in the removal rate of heavy metals, petroleum substances and COD of wastewater by wastewater treatment agents I and II.

[0087] The heavy metal removal rate, petroleum substance removal rate, and COD removal rate of Examples 1-3 are better than those of Example 9, indicating that xanthan gum, chitosan, phytic acid, and bamboo fiber have a good compatibility effect. This may be because the molecular structure of phytic acid contains more carboxyl groups. Using an appropriate amount of phytic acid to lower the pH value of the wastewater can improve the solubility of chitosan and the complexing effect between phytic acid, xanthan gum, and bamboo fiber. Compared with gelatin, xanthan gum has better acid and alkali resistance and can form a high-viscosity pseudoplastic solution, which prolongs the flocculation time of the complex formed by the fiber zeolite xanthan gum composition, and can better absorb heavy metals, petroleum substances, and reducing substances in wastewater. Compared to cotton fiber, the fiber zeolite xanthan gum composition has a better compatibility with bamboo fiber, which has better adsorption properties. The fiber zeolite xanthan gum composition and bamboo fiber have a good binding force. As the bamboo fiber with zeolite attached rolls up and down in the wastewater, the probability of wastewater treatment agent I and wastewater treatment agent II adsorbing and contacting heavy metals, petroleum substances and reducing substances is increased, thereby improving the purification effect of wastewater treatment agent I and wastewater treatment agent II on wastewater.

[0088] The heavy metal removal rate, petroleum substance removal rate, and COD removal rate of Examples 1-3 are better than those of Examples 10-13, indicating that zeolite is generated in situ on plant fibers, and plant fibers and zeolite have a good compatibility effect, improving the purification effect of wastewater treatment agent I and wastewater treatment agent II on wastewater. This may be because the zeolite is generated in situ on plant fibers, and the zeolite adheres well to the plant fibers. On the one hand, the zeolite, along with the plant fibers, increases the activity space of the zeolite fibers in the wastewater under the action of the stirring device, increasing the probability of wastewater treatment agent I and wastewater treatment agent II adsorbing and contacting heavy metals, petroleum substances, and reducing substances. On the other hand, the adsorption properties of zeolite and plant fibers are complementary, enhancing the adsorption performance of zeolite fibers, thereby improving the purification effect of wastewater treatment agent I and wastewater treatment agent II on wastewater.

[0089] Plant fibers are less dense than water and easily float on wastewater, while zeolite is denser than water and easily sinks to the bottom. Combining zeolite with plant fibers allows the zeolite fibers to move more freely in the wastewater under the action of the stirring device. This increases the likelihood of wastewater treatment agents I and II adsorbing and contacting heavy metals, petroleum substances, and reducing substances, thereby improving the purification effect on the wastewater.

[0090] Compared with Examples 1-3, the removal rates of heavy metals, petroleum substances and COD in Example 10 were worse. This may be because a portion of the zeolite generated on the plant fiber in Example 10 was relatively large and easily detached under the action of water flow, resulting in a decrease in the adsorption and complexation effect of the zeolite fiber.

[0091] Compared with Examples 1-3, the removal rates of heavy metals, petroleum substances and COD in Example 11 were worse. This may be because the zeolite generated on the plant fiber in Example 11 was smaller, and the zeolite fiber was more likely to float on the top of the wastewater, resulting in a decrease in the adsorption and complexation effect of the zeolite fiber.

[0092] The heavy metal removal rate, petroleum substance removal rate, and COD removal rate of Examples 1-3 are better than those of Examples 15-18, indicating that the installation of a stirring device in the primary and secondary coagulation sedimentation tanks, the setting of the stirring device speed to 7-12 r / min, and the final addition of the fiber zeolite xanthan gum composition further enhance the purification effect of wastewater treatment agent I and wastewater treatment agent II on wastewater.

[0093] The reasons for this may be as follows: A suitable stirring speed can increase the likelihood of wastewater treatment agents I and II adsorbing and contacting heavy metals, petroleum substances, and reducing agents, thereby improving the purification effect on wastewater. However, if the stirring speed is too high, zeolite on the zeolite fibers may fall off, leading to a decrease in the purification effect of wastewater treatment agents I and II. When adding wastewater treatment agents I and II, adding the fiber zeolite xanthan gum composition last, at a suitable stirring speed, may have a better complexing and adsorption effect on lower concentrations of heavy metals, petroleum substances, and reducing agents compared to PAC and PAM. Therefore, setting a suitable stirring speed and adding the fiber zeolite xanthan gum composition last further enhances the purification effect on wastewater.

[0094] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A wastewater treatment process for plate mill processing, characterized by, The application relates to a wastewater treatment device, which comprises, in sequence, a silanization adjusting tank, an oil separation tank, a primary coagulation sedimentation tank, a secondary coagulation sedimentation tank, an intermediate water tank, an activated carbon filter and a reuse water tank; the primary coagulation sedimentation tank and the secondary coagulation sedimentation tank are used in sequence to treat wastewater by using wastewater treatment agent I and wastewater treatment agent II; the wastewater treatment agent I and the wastewater treatment agent II each comprises, by weight of per ton of wastewater, 10-15 g of calcium chloride, 20-40 g of PAC and 15-25 g of a fiber zeolite xanthan gum composition. The raw material of the fiber zeolite xanthan gum composition comprises 1-3 parts of plant fiber, 15-20 parts of a zeolite precursor solution and 8-15 parts of xanthan gum, and the fiber zeolite xanthan gum composition is prepared by the following steps: S1: preparing a zeolite precursor solution, starting materials are prepared according to the following molar ratio 3Na2O:Al2O3:2SiO2:120H2O, and then mixed to obtain the zeolite precursor solution; S2: uniformly mixing the plant fiber and the zeolite precursor solution, and then heat treating at 80-150 DEG C for 20-30 h to obtain zeolite fiber; S3: uniformly mixing the zeolite fiber and xanthan gum to obtain the fiber zeolite xanthan gum composition.

2. A flatbed vehicle processed wastewater treatment process according to claim 1, characterized in that, The wastewater treatment agent I further comprises, by weight of per ton of wastewater, 10-15 g of sodium hydroxide and 2-4 g of PAM.

3. A flatbed vehicle processed wastewater treatment process according to claim 2, characterized in that, The feeding sequence of the wastewater treatment agent I is sodium hydroxide, calcium chloride, PAC, PAM and the fiber zeolite xanthan gum composition in sequence, by weight of per ton of wastewater.

4. A flatbed vehicle processed wastewater treatment process according to claim 1, characterized in that, The feeding sequence of the wastewater treatment agent II is sodium hydroxide, calcium chloride, PAC and the fiber zeolite xanthan gum composition in sequence.

5. A flatbed truck processed wastewater treatment process according to any one of claims 3-4, characterized in that, The primary coagulation sedimentation tank and the secondary coagulation sedimentation tank are each provided with a stirring device, and the stirring speed of the stirring device is 7-12 r / min.

6. A flatbed vehicle processed wastewater treatment process according to claim 1, characterized in that, The plant fiber is bamboo fiber or hemp fiber.

7. A flatbed vehicle processed wastewater treatment process according to claim 1, characterized in that, The fiber zeolite xanthan gum composition further comprises 5-10 parts of chitosan, and the chitosan is added in the step S3.

8. A flatbed truck processed wastewater treatment process according to claim 7, characterized in that, The fiber zeolite xanthan gum composition further comprises 4-8 parts of phytic acid, and the phytic acid is added in the step S3.

9. A flatbed vehicle processed wastewater treatment process according to claim 1, characterized in that, The primary coagulation sedimentation tank and the secondary coagulation sedimentation tank are communicated to a silanization sludge tank; the activated carbon filter is communicated to the intermediate water tank through a filter water pump; and the silanization sludge tank is connected with a plate-and-frame filter press, and the plate-and-frame filter press is communicated to the silanization sludge tank through a sludge pump.

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