Sewage collection system for workshop cow leather and automobile leather tanning process

Abstract

A sewage collection system for a workshop cow leather and automobile leather tanning process comprises a tannin extract waste water collection system (1), a comprehensive waste water collection system (2), a glutaraldehyde waste water collection system (3), a sulfur-containing waste water collection system (4) and a high-salinity waste water collection system (5), and the comprehensive waste water collection system (2) adopts a drainage ditch (6) to collect waste water. The drainage ditch (6), the thick-section drainage ditch (102), the thin-section drainage ditch (103), the glutaraldehyde waste water drainage ditch (301) and the high-salt drainage ditch (501) are all made of reinforced concrete with the anti-permeability pressure larger than or equal to 0.6 MPa in a cast-in-place mode, and the ditch bottoms are leveled along the slope through high-strength self-leveling mortar. The tannin extract waste water collecting system, the comprehensive waste water collecting system, the glutaraldehyde waste water collecting system, the sulfur-containing waste water collecting system and the high-salt waste water collecting system are combined, so that cross contamination among various kinds of sewage is effectively avoided, the sewage can be independently treated in the subsequent treatment link, and the treatment cost is reduced. And the environment is not polluted when the wastewater is discharged.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and specifically relates to a sewage collection system for a cowhide automobile leather tanning process in a workshop. Background Art

[0002] The leather making process refers to the process of tanning raw hides into leather, which involves a series of chemical and mechanical treatment processes such as removing hair and non-collagenous fibers, loosening, fixing and strengthening the collagen fibers in the dermis, and then finishing them. During this process, a large amount of wastewater is usually generated, and since a series of chemical processes are used in the process, the wastewater often contains a large amount of chemical agents.

[0003] Moreover, the leather-making process is usually divided into different steps, and the chemical agents used in each step are different. If they are collected and processed uniformly, cross-contamination will often occur, making subsequent processing more complicated. And if they are processed centrally, it is often necessary to treat a large amount of polluted water at one time, which also increases the company's environmental protection investment costs. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a wastewater collection system for the cowhide automobile leather tanning process in a workshop, which at least partially solves the above problems.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a wastewater collection system for a cowhide automobile leather tanning process in a workshop, including a tannin extract wastewater collection system. The tannin extract wastewater collection system is located inside a dyeing process plant. The tannin extract wastewater collection system adopts a tannin extract wastewater pipe and a coarse-section drainage ditch and a fine-section drainage ditch that cooperate with each other. The tannin extract wastewater pipe is distributed on both sides of the relevant equipment, and a tannin extract wastewater tank is provided on one side of the tannin extract wastewater collection system. A comprehensive wastewater collection system is located in the main immersion and ash packaging area, as well as the drum area and the pool area. The comprehensive wastewater collection system uses drainage ditches to collect wastewater, and a comprehensive wastewater pool is provided in the eastern part of the comprehensive wastewater system; A glutaraldehyde wastewater collection system, wherein the glutaraldehyde wastewater collection system is located inside the primary tanning process plant and is distributed on both sides of the drum. The glutaraldehyde wastewater collection system uses a glutaraldehyde wastewater drainage ditch to collect wastewater, and a glutaraldehyde wastewater pool is provided on one side of the glutaraldehyde wastewater collection system; A sulfur-containing wastewater collection system is located inside the main soaking and ash packaging process building, and on both sides of the second and third rows of drums. The sulfur-containing wastewater collection system uses the internal cleaning pump of the wool filter to lift the sulfur-containing wastewater to the sulfur-containing wastewater pool; A high-salt wastewater collection system, located inside the drum area and the pool area, mainly uses a high-salt drainage ditch to collect wastewater; The drainage ditch, coarse section drainage ditch, fine section drainage ditch, glutaraldehyde wastewater drainage ditch and high salt drainage ditch are all cast in place with reinforced concrete with an anti-seepage pressure of ≥0.6MPa, and the ditch bottom is leveled along the slope with high-strength self-leveling mortar.

[0006] Furthermore, the tannin extract wastewater pipeline is laid using a DN300 pipeline, and the tannin extract wastewater pipeline is placed above the ground. The overall slope of the tannin extract wastewater pipeline is 0.5%. The end of the tannin extract wastewater pipeline on one side is connected to the thin drainage ditch, and the width of the thin drainage ditch is 300 mm. The end of the tannin extract wastewater pipeline on the other side is connected to the thick drainage ditch, and the width of the thick drainage ditch is 500 mm. The thick drainage ditch is connected to one end of the thin drainage ditch through a flange, and the tail of the thick drainage ditch is connected to the tannin extract wastewater pool.

[0007] Furthermore, the drainage ditch includes an east-west main ditch and a north-south main ditch. The width of the east-west main ditch is 500 mm, and the width of the north-south main ditch is 600 mm. The slope of the drainage ditch on both sides of the bottom of the drum is set to 1%. The ditch cover plate on the upper part of the east-west main ditch is a cast iron grate plate, and the main ditch cover plate on the upper part of the north-south main ditch is a cast iron plate.

[0008] Furthermore, the width of the glutaraldehyde wastewater drainage ditch is 500 mm, the slope of the glutaraldehyde wastewater drainage ditch is set to 0.5%, and the glutaraldehyde wastewater drainage ditches on both sides of the drum are connected to the glutaraldehyde wastewater drainage ditches on both sides of the glutaraldehyde wastewater pool through PE pipes.

[0009] Furthermore, the amount of water transported into the sulfur-containing wastewater pool by the sulfur-containing wastewater collection system within 24 hours is 80 to 90 tons.

[0010] Furthermore, the high-salt drainage ditch is divided into an east-west high-salt water ditch and a north-south high-salt water ditch. The width of the east-west high-salt water ditch is 500 mm and the slope is 0.5%, and the slope of the north-south high-salt water ditch is 0.5%. The ditch cover above the east-west high-salt water ditch adopts a cast iron grate plate, and the ditch cover above the north-south high-salt water ditch adopts a cast iron plate.

[0011] Furthermore, the upper cover plates of the drainage ditch, thick section drainage ditch, thin section drainage ditch, glutaraldehyde wastewater drainage ditch and high salt drainage ditch are all borne by active loads of 15-25 kn / ㎡, the inner walls of the drainage ditch, thick section drainage ditch, thin section drainage ditch, glutaraldehyde wastewater drainage ditch and high salt drainage ditch are all paved with waterproof mortar, the outside of the waterproof mortar is paved with an anti-corrosion layer, and the anti-corrosion layer is composed of anti-corrosion fiberglass, epoxy resin paint and glass fiber cloth, the bottom of the drainage ditch, thick section drainage ditch, thin section drainage ditch, glutaraldehyde wastewater drainage ditch and high salt drainage ditch is a slope, the inclination of the slope is 2%, and a ditch is provided at the low point of the slope, and the ditch is used to cooperate with the corresponding circular drainage to treat sewage.

[0012] The beneficial effects achieved by the present invention using the above structure are as follows: (1) By using a process that combines the tannin extract wastewater collection system, the comprehensive wastewater collection system, the glutaraldehyde wastewater collection system, the sulfur-containing wastewater collection system, and the high-salt wastewater collection system, cross-contamination between various wastewaters is effectively avoided, so that the wastewater can be treated separately in the subsequent treatment process, ensuring that the wastewater will not pollute the environment when it is discharged; (2) In the case of impermeable reinforced concrete, based on its load limit per square centimeter, it can effectively offset the scouring force generated by a large amount of water when it flows, and based on its anti-seepage pressure, it can be seen that this type of concrete can effectively prevent water seepage, thereby preventing wastewater from polluting the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a plan view of a wastewater collection system for a cowhide automobile leather tanning process in a workshop proposed in an embodiment of the present invention; Figure 2 for Figure 1 A partial enlarged view of point A in the middle; Figure 3 A transverse cross-sectional view of a drainage ditch according to an embodiment of the present invention; Figure 4 for Figure 1 A partial enlarged view of point B in the middle.

[0014] Among them, 1. Tannin extract wastewater collection system, 2. Comprehensive wastewater collection system, 3. Glutaraldehyde wastewater collection system, 4. Sulfur-containing wastewater collection system, 5. High-salt wastewater collection system, 6. Drainage ditch, 7. Waterproof mortar, 8. Anti-corrosion layer, 9. Slope, 10. Ditch, 101. Tannin extract wastewater pipeline, 102. Thin section drainage ditch, 104. Tannin extract wastewater pool, 201. Comprehensive wastewater pool, 301. Glutaraldehyde wastewater drainage ditch, 302. Glutaraldehyde wastewater pool, 401. Sulfur-containing wastewater ground pool, 501. High-salt drainage ditch, 601. East-west main ditch, 602. North-south main ditch, 5011. East-west high-salt water ditch, 5012. North-south high-salt water ditch.

[0015] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0018] like Figure 1 As shown, the present invention proposes a wastewater collection system for a cowhide automobile leather tanning process in a workshop, comprising a tannin extract wastewater collection system 1, the tannin extract wastewater collection system 1 being located inside a dyeing process workshop. The tannin extract wastewater collection system 1 employs a tannin extract wastewater pipe 101, a coarse-section drainage ditch 102, and a fine-section drainage ditch 103 that cooperate with each other. The tannin extract wastewater pipe 101 is distributed on both sides of the relevant equipment, and a tannin extract wastewater tank 103 is provided on one side of the tannin extract wastewater collection system 1. The integrated wastewater collection system 2 is located in the main immersion and ash packaging area, as well as the drum area and the pool area. The integrated wastewater collection system 2 uses a drainage ditch 6 to collect wastewater. A comprehensive wastewater pool 201 is provided in the east of the integrated wastewater system 2; A glutaraldehyde wastewater collection system 3 is located inside the primary tanning process building and is distributed on both sides of the drum. The glutaraldehyde wastewater collection system 3 uses a glutaraldehyde wastewater drainage ditch 301 to collect wastewater, and a glutaraldehyde wastewater pool 302 is provided on one side of the glutaraldehyde wastewater collection system 3; The sulfur-containing wastewater collection system 4 is located inside the main soaking and ash packaging process workshop and on both sides of the second and third rows of drums. The sulfur-containing wastewater collection system 4 uses the internal cleaning pump of the wool filter to lift the sulfur-containing wastewater to the sulfur-containing wastewater tank 401; A high-salt wastewater collection system 5 is located inside the drum area and the pool area. The high-salt wastewater collection system 5 mainly uses a high-salt drain ditch 501 to collect wastewater; The drainage ditch 6, the thick section drainage ditch 102, the thin section drainage ditch 103, the glutaraldehyde wastewater drainage ditch 301 and the high-salt drainage ditch 501 are all cast in situ with reinforced concrete having an impermeability pressure ≥ 0.6 MPa, and the ditch bottom is leveled along the slope with high-strength self-leveling mortar.

[0019] In this embodiment, since leather making generally includes three major stages: preparation, tanning and finishing; in the pre-tanning preparation section, the sewage mainly comes from washing, soaking, dehairing, liming, deliming, softening and degreasing; the main pollutants include organic waste, inorganic waste and organic compounds; the wastewater in the tanning section mainly comes from washing, pickling and tanning; the main pollutants are inorganic salts and heavy metal chromium; the wastewater in the finishing section mainly comes from washing, squeezing, dyeing, greasing and dust removal sewage, etc., and the pollutants include dyes, oils and organic compounds. Therefore, the wastewater generated by leather making has a high pollutant content and complex composition. By using a process combining tannin wastewater collection system 1, comprehensive wastewater collection system 2, glutaraldehyde wastewater collection system 3, sulfur-containing wastewater collection system 4 and high-salt wastewater collection system 5, cross-contamination between various sewages is effectively avoided, so that the sewage can be treated separately in subsequent treatment links, ensuring that the wastewater will not pollute the environment when discharged.

[0020] In some embodiments, concrete is selected with an anti-seepage pressure greater than 0.6MPa. Due to the particularity of the wastewater generated during cowhide production, through experiments or by selecting the above-mentioned concrete, the scouring force generated by the actual flow of leather wastewater can be effectively offset. An optional concrete is model c30p6. Among them, model c30p6 refers to the compressive strength of concrete, and paint means the strength limit when external force applies pressure; here, C30 means that the force limit per square centimeter is 30 kilograms, and p6 means the waterproof level, which specifically means that the anti-seepage pressure is greater than 0.6MPa. Through such values, you can quickly understand the waterproof performance and anti-permeability of the product. According to its anti-seepage pressure, it can be seen that this type of concrete can effectively prevent water seepage, thereby preventing wastewater from polluting the surrounding environment.

[0021] like Figure 1As shown, the tannin wastewater pipe 101 is laid using a DN300 pipe. The tannin wastewater pipe 101 is placed above the ground, and the overall slope of the tannin wastewater pipe 101 is 0.5%. The end of the tannin wastewater pipe 101 on one side is connected to a thin drainage ditch 103, and the width of the thin drainage ditch 103 is 300 mm. The end of the tannin wastewater pipe 101 on the other side is connected to a thick drainage ditch 102, and the width of the thick drainage ditch 102 is 500 mm. The thick drainage ditch 102 is connected to one end of the thin drainage ditch 103 through a flange, and the tail of the thick drainage ditch 102 is connected to the tannin wastewater tank 103.

[0022] In this embodiment, since the tannin wastewater contains a large amount of suspended matter, its flow resistance is greater than that of ordinary water. The cross-sectional shape of the circular pipe can reduce the resistance of the water flow, making the water flow smoother. In addition, since the pipe diameter of DN300 is adopted, the total drainage capacity of the tannin wastewater pipe 101 can meet the full load production of the factory.

[0023] By setting the overall slope of the tannin wastewater pipeline 101 to 0.5%, the tannin wastewater can flow and discharge naturally without the need for additional water pumps, thereby reducing the initial investment and subsequent maintenance costs. By connecting the tannin wastewater pipeline 101 to the coarse section drainage ditch 102 and the thin section drainage ditch 103 respectively, the wastewater in the tannin wastewater pipelines 101 on both sides can be converged into the rectangular coarse section drainage ditch 102. At this time, since the cross-sectional area of ​​the pipeline is programmed from a circle to a rectangle, the flow rate of the fluid in the pipeline can be effectively reduced, so that the suspended matter in the tannin wastewater can be initially flocculated.

[0024] like Figure 4 As shown, the drainage ditch 6 includes an east-west main ditch 601 and a north-south main ditch 602. The width of the east-west main ditch 601 is 500 mm, and the width of the north-south main ditch 602 is 600 mm. The slope of the drainage ditch 6 on both sides of the bottom of the drum is set to 1%. The ditch cover plate on the upper part of the east-west main ditch 601 is made of cast iron grate plate, and the main ditch cover plate on the upper part of the north-south main ditch 602 is made of cast iron plate.

[0025] In this embodiment, comprehensive wastewater refers to the general term for various wastewaters generated by leather and fur processing enterprises or centralized processing areas and discharged directly or indirectly into the comprehensive wastewater treatment project. Since the discharge volume of comprehensive wastewater is huge and the sources of wastewater are spread throughout the entire processing plant, it is necessary to set up an east-west main ditch 601 and a north-south main ditch 602, and according to the distribution of production equipment, the width of the east-west main ditch 601 is 500 mm, and the width of the north-south main ditch 602 is 600 mm to meet the required wastewater discharge volume.

[0026] However, due to the limited area of ​​the factory building and the large width of the east-west main ditch 601 and the north-south main ditch 602, the overall usable area of ​​the factory building will be reduced. In order to effectively ensure the overall usable area of ​​the factory building, it is necessary to install a ditch cover on the main ditch 601. In order to ensure that the ditch cover has a certain load-bearing capacity, cast iron grate plates and cast iron plates are respectively installed according to the daily walking habits of personnel and the distribution of machines.

[0027] like Figure 1 As shown, the width of the glutaraldehyde wastewater drainage ditch 301 is 500 mm, and the slope of the glutaraldehyde wastewater drainage ditch 301 is set to 0.5%. The glutaraldehyde wastewater drainage ditches 301 on both sides of the drum are connected to the glutaraldehyde wastewater drainage ditches 301 on both sides of the glutaraldehyde wastewater pool 302 through PE pipes.

[0028] In this embodiment, glutaraldehyde preparations are commonly used as fungicides and tanning agents. Glutaraldehyde is somewhat irritating and can cause human skin to turn a shiny brown color. Based on these characteristics, the width of the glutaraldehyde wastewater drainage ditch 301 is set at 500 mm. This ensures that even at a high flow rate, the glutaraldehyde wastewater will not exceed two-thirds of the internal height of the glutaraldehyde wastewater drainage ditch 301, effectively reducing human contact with the glutaraldehyde wastewater.

[0029] like Figure 1 As shown, the amount of water transported into the sulfur-containing wastewater pool 401 by the sulfur-containing wastewater collection system 4 within 24 hours is 80 to 90 tons.

[0030] In this embodiment, sulfur-containing wastewater refers to the liming wastewater and the corresponding washing process wastewater generated by the ash-alkali method of dehairing in the leather making process. The above-mentioned process is the pre-process part of the leather making process and therefore requires long working hours. Therefore, it is necessary to ensure that the corresponding large amount of wastewater can be discharged in a timely manner. Therefore, the amount of water transported into the sulfur-containing wastewater pool 401 by the sulfur-containing wastewater collection system 4 within 24 hours needs to be maintained at 80 to 90 tons.

[0031] like Figure 1 As shown, the high-salt drainage ditch 501 is divided into an east-west high-salt water ditch 5011 and a north-south high-salt water ditch 5012. The width of the east-west high-salt water ditch 5011 is 500 mm, and the slope is 0.5%, and the slope of the north-south high-salt water ditch 5012 is 0.5%. The ditch cover above the east-west high-salt water ditch 5011 adopts a cast iron grate plate, and the ditch cover above the north-south high-salt water ditch 5012 adopts a cast iron plate.

[0032] In this embodiment, high-salt wastewater contains a large amount of inorganic salts, which are extremely corrosive to metals. Therefore, both the ditch cover above the east-west high-salt water ditch 5011 and the ditch cover above the north-south high-salt water ditch 5012 use cast iron as the raw material. Due to its heat resistance, wear resistance, corrosion resistance, and low temperature resistance, it can effectively prevent corrosion from high-salt wastewater.

[0033] like Figure 3 As shown, the upper cover plates of the drainage ditch 6, the thick section drainage ditch 102, the thin section drainage ditch 103, the glutaraldehyde wastewater drainage ditch 301 and the high-salt drainage ditch 501 are all borne by active loads of 15-25 kn / m2. The inner walls of the drainage ditch 6, the thick section drainage ditch 102, the thin section drainage ditch 103, the glutaraldehyde wastewater drainage ditch 301 and the high-salt drainage ditch 501 are all paved with waterproof mortar 7. The outside of the waterproof mortar 7 is paved with an anti-corrosion layer 8, and the anti-corrosion layer 8 is composed of anti-corrosion fiberglass, epoxy resin paint and glass fiber cloth. The bottom of the drainage ditch 6, the thick section drainage ditch 102, the thin section drainage ditch 103, the glutaraldehyde wastewater drainage ditch 301 and the high-salt drainage ditch 501 is a slope 9 with an inclination of 2%. A ditch 10 is provided at the low point of the slope 9, and the ditch 10 is used to cooperate with the corresponding circular drainage to treat sewage.

[0034] In this embodiment, since the upper cover plates of the drainage ditch 6, the thick section drainage ditch 102, the thin section drainage ditch 103, the glutaraldehyde wastewater drainage ditch 301 and the high-salt drainage ditch 501 are all borne by active loads of 15-25 kn / m2, production personnel can move freely above them, and when large equipment or raw materials need to be transported in the factory, the standard of 15-25 kn / m2 can also meet the daily needs of personnel.

[0035] The inner walls of the drainage ditch 6, the thick section drainage ditch 102, the thin section drainage ditch 103, the glutaraldehyde wastewater drainage ditch 301 and the high-salt drainage ditch 501 are all paved with waterproof mortar 7, and the outside of the waterproof mortar 7 is paved with an anti-corrosion layer 8, which can effectively prevent various wastewaters from corroding or penetrating the inner wall of the pipe.

[0036] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

[0038] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A wastewater collection system for a cowhide automobile leather tanning process in a workshop, characterized by: The invention comprises a tannin extract wastewater collection system (1), wherein the tannin extract wastewater collection system (1) is located inside a dyeing process workshop, wherein the tannin extract wastewater collection system (1) adopts a tannin extract wastewater pipe (101), a coarse section drainage ditch (102), and a fine section drainage ditch (103) in cooperation with each other, wherein the tannin extract wastewater pipe (101) is distributed on both sides of relevant equipment, and a tannin extract wastewater pool (104) is provided on one side of the tannin extract wastewater collection system (1); An integrated wastewater collection system (2), the integrated wastewater collection system (2) being located in the main soaking and ash packaging area, the drum area, and the water pool area. The integrated wastewater collection system (2) uses a drainage ditch (6) for wastewater collection. An integrated wastewater pool (201) is provided in the east of the integrated wastewater system (2); A glutaraldehyde wastewater collection system (3), the glutaraldehyde wastewater collection system (3) is located inside the primary tanning process plant, and the glutaraldehyde wastewater collection system (3) is distributed on both sides of the drum. The glutaraldehyde wastewater collection system (3) uses a glutaraldehyde wastewater drainage ditch (301) to collect wastewater, and a glutaraldehyde wastewater pool (302) is provided on one side of the glutaraldehyde wastewater collection system (3); A sulfur-containing wastewater collection system (4), the sulfur-containing wastewater collection system (4) is located inside the main soaking and ash packaging process workshop and on both sides of the second and third rows of drums, and the sulfur-containing wastewater collection system (4) uses an internal cleaning pump of the hair filter to lift the sulfur-containing wastewater to the sulfur-containing wastewater pool (401); A high-salt wastewater collection system (5), the high-salt wastewater collection system (5) is located inside the drum area and the pool area, and the high-salt wastewater collection system (5) mainly uses a high-salt drainage ditch (501) to collect wastewater; The drainage ditch (6), the thick section drainage ditch (102), the thin section drainage ditch (103), the glutaraldehyde wastewater drainage ditch (301) and the high-salt drainage ditch (501) are all cast-in-place reinforced concrete with an anti-seepage pressure of ≥0.6 MPa, and the ditch bottom is leveled along the slope using high-strength self-leveling mortar.

2. The wastewater collection system for the cowhide automobile leather tanning process in the workshop according to claim 1 is characterized by: The tannin extract wastewater pipeline (101) is laid using a DN300 pipeline. The tannin extract wastewater pipeline (101) is placed above the ground. The overall slope of the tannin extract wastewater pipeline (101) is 0.5%. The end of the tannin extract wastewater pipeline (101) on one side is connected to a thin drainage ditch (103), and the end of the tannin extract wastewater pipeline (101) on the other side is connected to a thick drainage ditch (102). The thick drainage ditch (102) is connected to one end of the thin drainage ditch (103) through a flange, and the tail of the thick drainage ditch (102) is connected to the tannin extract wastewater pool (103).

3. The wastewater collection system for the cowhide automobile leather tanning process in a workshop according to claim 1 is characterized by: The drainage ditch (6) comprises an east-west main ditch (601) and a north-south main ditch (602). The width of the east-west main ditch (601) is 500 mm, and the width of the north-south main ditch (602) is 600 mm. The slope of the drainage ditch (6) on both sides of the bottom of the drum is set to 1%. The ditch cover plate on the upper part of the east-west main ditch (601) adopts a cast iron grate plate, and the main ditch cover plate on the upper part of the north-south main ditch (602) adopts a cast iron plate.

4. The wastewater collection system for the cowhide automobile leather tanning process in a workshop according to claim 1 is characterized by: The width of the glutaraldehyde wastewater drainage ditch (301) is 500 mm, and the slope of the glutaraldehyde wastewater drainage ditch (301) is set to 0.5%. The glutaraldehyde wastewater drainage ditches (301) on both sides of the drum are connected to the glutaraldehyde wastewater drainage ditches (301) on both sides of the glutaraldehyde wastewater pool (302) through PE pipes.

5. The wastewater collection system for the cowhide automobile leather tanning process in a workshop according to claim 1 is characterized by: The amount of water transported by the sulfur-containing wastewater collection system (4) into the sulfur-containing wastewater pool (401) within 24 hours is 80 to 90 tons.

6. The wastewater collection system for the cowhide automobile leather tanning process in a workshop according to claim 1 is characterized by: The high-salt drainage ditch (501) is divided into an east-west high-salt water ditch (5011) and a north-south high-salt water ditch (5012). The east-west high-salt water ditch (5011) has a width of 500 mm and a slope of 0.5%, and the north-south high-salt water ditch (5012) has a slope of 0.5%. The ditch cover plate above the east-west high-salt water ditch (5011) adopts a cast iron grate plate, and the ditch cover plate above the north-south high-salt water ditch (5012) adopts a cast iron plate.

7. The wastewater collection system for the cowhide automobile leather tanning process in a workshop according to claim 1 is characterized by: The upper cover plates of the drainage ditch (6), the thick drainage ditch (102), the thin drainage ditch (103), the glutaraldehyde wastewater drainage ditch (301) and the high-salt drainage ditch (501) are all subjected to a movable load of 15-25 kn / ㎡. The inner walls of the drainage ditch (6), the thick drainage ditch (102), the thin drainage ditch (103), the glutaraldehyde wastewater drainage ditch (301) and the high-salt drainage ditch (501) are all paved with waterproof mortar (7). The outer surface of the waterproof mortar (7) is An anti-corrosion layer (8) is laid, and the anti-corrosion layer (8) is composed of anti-corrosion glass fiber reinforced plastics, epoxy resin paint and glass fiber cloth. The bottom of the drainage ditch (6), the thick section drainage ditch (102), the thin section drainage ditch (103), the glutaraldehyde wastewater drainage ditch (301) and the high-salt drainage ditch (501) is a slope (9), and the inclination of the slope (9) is 2%. A ditch (10) is provided at the low point of the slope (9), and the ditch (10) is used to cooperate with the corresponding circular drainage to treat sewage.

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