Biochemical treatment device for high-calcium high-ammonia-nitrogen gelatin wastewater and use method

Abstract

The invention provides a high-calcium high-ammonia-nitrogen gelatin wastewater biochemical treatment device and a use method, which can improve the wastewater treatment effect and the treatment cost of the gelatin industry, and the underground first-layer wastewater treatment workshop comprises a first grid treatment area, a grey water collecting tank, a reaction air floatation tank and a horizontal flow type primary sedimentation tank which are connected in sequence; wastewater from pickling, phosphorus-calcium and liming workshops is communicated to a grating treatment area, and wastewater from degreasing and submitting workshops is communicated to a horizontal-flow primary sedimentation tank through a second grating treatment area; the underground second-layer wastewater treatment workshop comprises a return sludge denitrification tank, an anaerobic tank, an anoxic tank, an MBBR tank and a secondary sedimentation tank which are communicated in sequence; 30% of the wastewater treated by the horizontal-flow primary sedimentation tank is connected to the return sludge denitrification tank, 70% of the wastewater is communicated to the anaerobic tank for treatment, a drainage channel of the return sludge denitrification tank is communicated with a water inlet channel of the anaerobic tank, a mixed solution of the MBBR tank flows back to the anoxic tank, a mixed solution of the secondary sedimentation tank flows back to the return sludge denitrification tank, and the anaerobic tank flows back to the anaerobic tank. 40% of sludge in the secondary sedimentation tank flows back to the returned sludge denitrification tank.

Description

Technical Field

[0001] The invention relates to the field of wastewater treatment in gelatin production, and in particular to a biochemical treatment device for high-calcium and high-ammonia nitrogen gelatin wastewater and a use method thereof. Background Art

[0002] The wastewater from gelatin production mainly comes from five processes: degreasing, calcium hydrogen phosphate synthesis, liming, neutralization, and gelatin extraction. Common wastewater treatment methods include: biological treatment, filtration and adsorption, oxidation, and acidification-coagulation secondary treatment. Among them, the biological treatment method uses bacteria to digest organic matter in the wastewater, the filtration and adsorption method reduces the COD value in the wastewater through the adsorption of organic matter by activated carbon, the oxidation method uses strong oxidizing conditions to oxidize and decompose organic and polymer compounds, and the acidification-coagulation secondary treatment method uses polymers to coagulate long gelatin coagulants under acidic conditions, and then filter and separate them.

[0003] However, since the sewage treatment area is often located in the corner of the factory, it needs to be equipped with more pipes and occupy more land, making the construction cost of the factory area high. At the same time, because the temperature is low in winter or at night, the temperature affects the activity of microorganisms, so the biological treatment area often uses warm air blowing to maintain the water temperature of the biochemical treatment pool, but it still cannot keep the water temperature at a high level in winter. It is necessary to further introduce heating equipment, which increases energy consumption and affects the nitrification effect. Since the temperature of meat sebum is low and it is not easy to deteriorate, winter is the absolute peak season in the field of gelatin production. The strong production progress makes more gelatin wastewater generated in winter, and the original treatment method directly affects the efficiency and cost of gelatin treatment. Summary of the invention

[0004] The purpose of the present invention is to provide a high-calcium and high-ammonia nitrogen gelatin wastewater biochemical treatment device and a method of use, which can improve the wastewater treatment effect and treatment cost of the gelatin industry.

[0005] The embodiment of the present invention is achieved as follows:

[0006] A biochemical treatment device for high-calcium and high-ammonia-nitrogen gelatin wastewater, comprising:

[0007] The wastewater treatment workshop on the underground floor includes the first grid treatment area, the ash water collection tank, the reaction flotation tank, and the horizontal flow primary sedimentation tank, which are connected in sequence. The first grid treatment area includes multi-level partitions, and each level of partition adopts three grids of coarse 30mm + medium 20mm + fine 5mm; the drainage channels of the wastewater from the pickling workshop, the wastewater from the phosphate and calcium workshop, and the wastewater from the liming workshop are connected to the water inlet channel of the grid treatment area, and the drainage channels of the wastewater from the degreasing workshop and the wastewater from the submission workshop are connected to the water inlet channel of the horizontal flow primary sedimentation tank through the second grid treatment area;

[0008] The underground second-floor wastewater treatment workshop includes a return sludge denitrification tank, an anaerobic tank, an anoxic tank, an MBBR tank, a secondary sedimentation tank, a coagulation sedimentation tank, a filter cloth filter, and an ultraviolet disinfection tank which are connected in sequence; 30% of the wastewater treated in the horizontal flow primary sedimentation tank is connected to the return sludge denitrification tank through a pipe, and 70% of the wastewater is connected to the anaerobic tank for treatment. The drainage channel of the return sludge denitrification tank is connected to the water inlet channel of the anaerobic tank. The mixed liquor of the MBBR tank flows back to the anoxic tank, the mixed liquor of the secondary sedimentation tank flows back to the return sludge denitrification tank, and 40% of the sludge of the secondary sedimentation tank flows back to the return sludge denitrification tank.

[0009] In a preferred embodiment of the present invention, the gray water collection tank and the reaction flotation tank are both provided with aeration devices, coagulant polyaluminum chloride and flocculant polyacrylamide are added to the reaction flotation tank, and after stirring and reacting, the wastewater flows into the horizontal flow primary sedimentation tank.

[0010] In a preferred embodiment of the present invention, the sludge in the above-mentioned reaction flotation tank, the mud in the grid treatment area, the mud in the gray water collection tank, and the mud in the horizontal flow primary sedimentation tank are all discharged to the sludge collection tank of the wastewater treatment workshop on the second underground floor, and the remaining 50% of the sludge in the secondary sedimentation tank is discharged to the sludge thickening tank on the second underground floor. The sludge discharge outlet of the sludge thickening tank and the mud inlet of the sludge collection tank are connected. The sludge collection tank is pumped into a sludge dewatering machine for dehydration, and the supernatant, filtrate and flushing water in the desludge process are pumped back to the horizontal flow primary sedimentation tank by a pump.

[0011] In a preferred embodiment of the present invention, the design water depth of the above-mentioned horizontal flow primary sedimentation tank is 5m, the average flow residence time is 15min, the peak flow residence time is 7.5min, and 2 sets of bridge-type sludge suction machines and 2 sets of mud-water separators are arranged in the horizontal flow primary sedimentation tank.

[0012] In a preferred embodiment of the present invention, a submersible mixer is arranged in the anaerobic tank and the anoxic tank, and a liftable aerator is arranged in the MBBR tank.

[0013] In a preferred embodiment of the present invention, the above-mentioned filter cloth filter tank and ultraviolet disinfection tank are built together, and ultraviolet disinfection lamps are arranged on the top and the wall of the filter cloth filter tank. A backwash pump, a rotary drive motor, a filter cloth turntable and a center pipe, a submersible sewage pipe, and a sodium hypochlorite unloading pump are also arranged in the filter tank. The sodium hypochlorite unloading pump is used to put sodium hypochlorite into the filter cloth filter tank for disinfection.

[0014] In a preferred embodiment of the present invention, the above-mentioned sludge thickening tank is provided with a suspended central transmission sludge scraper.

[0015] In a preferred embodiment of the present invention, the secondary sedimentation tank comprises a flocculation reaction zone and a clarification zone, a submersible agitator is provided in the flocculation reaction zone, and a filter is provided in the clarification zone.

[0016] A method for using a high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device, using any high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device, the method for using the high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device includes:

[0017] The wastewater from the ground gelatin production and processing workshop is transported to the first grid treatment area and the second grid treatment area of ​​the underground wastewater treatment workshop through pipelines; the drainage channels of the wastewater from the pickling workshop, the wastewater from the phosphate calcium workshop and the wastewater from the liming workshop are connected to the first grid treatment area to remove coarse bone matter and fine slag, and then flow to the ash water collection tank for aeration and sedimentation, and then the supernatant flows to the reaction flotation tank, where coagulant polyaluminum chloride and flocculant polyacrylamide are added, and after stirring and reacting, oils and other substances that are not easy to sink in the wastewater are removed; the wastewater is scraped off the scum by the scraper above the flotation tank and then sent to the sludge collection tank for dehydration treatment; then the supernatant from the reaction flotation tank is collected in the horizontal flow primary sedimentation tank for further sedimentation;

[0018] The wastewater from the degreasing workshop and the wastewater from the submission workshop are transported to the second grid treatment area through pipelines for treatment and then directly flow into the horizontal flow primary sedimentation tank for sedimentation and waiting for the treatment of the supernatant;

[0019] 30% of the supernatant from the horizontal flow primary sedimentation tank is pumped out by a pump and enters the return sludge denitrification tank for preliminary deammonification and denitrification, and then enters the anaerobic tank, anoxic tank and MBBR tank for step-by-step treatment using the activated sludge method. After the mixed liquor from the MBBR tank is precipitated in the secondary sedimentation tank, although the effluent has reached the standard, the supernatant is still further treated by adding flocculants to the filter cloth filter tank and stirring it thoroughly to mix it with the sewage, thereby converting the suspended matter and soluble substances in the sewage into floccules; after the sewage enters the clarification area, the floccules are subjected to the action of agent adsorption, flocculation, electrochemical reaction and filtration to form relatively large alum flowers, and the flocculants are removed by filtration, interception or precipitation, and are discharged after disinfection with ultraviolet rays and sodium hypochlorite.

[0020] The beneficial effects of the embodiments of the present invention are:

[0021] 1. In the present invention, by using the first and second underground floors as sewage treatment sites in the gelatin production process and the ground as the production plant, it is possible to save space, reduce construction costs, approval costs and other costs;

[0022] 2. The new gelatin wastewater biochemical treatment device sets the return sludge denitrification tank, anaerobic tank, anoxic tank and MBBR tank on the second underground floor, making use of the heat storage function of the ground, so that the entire sewage treatment process has a higher temperature even in winter or at night, avoiding the use of blowers and heating and purge equipment to maintain the water temperature of the treatment tank by blowing, saving energy and equipment, and making the entire nitrification reaction have a better nitrification effect, thereby improving the high ammonia nitrogen treatment efficiency of the gelatin wastewater biochemical treatment device;

[0023] 3. On the first underground floor, the first grid treatment area and the second grid treatment area are used to treat the gelatin wastewater from different workshops respectively, effectively removing coarse matter and fine residue such as bone particles, bone residue, sebum, etc., and then further gray water collection tank sedimentation and horizontal flow primary sedimentation tank are used to first remove calcium in the wastewater to reduce the blockage of the aeration device, and preliminary treatment is carried out. The pretreated gelatin production wastewater enters the biological reaction treatment layer on the second underground floor. The second underground floor mainly includes return sludge denitrification tank, anaerobic tank, anoxic tank, MBBR tank. Compared with the traditional biochemical treatment tank, it adopts simultaneous nitrification and denitrification process, which has the advantages of short reaction time, saving carbon source and reducing reactor volume, thereby improving the treatment efficiency of the device for ammonia nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a processing flow chart of the biochemical treatment device for high-calcium and high-ammonia-nitrogen gelatin wastewater according to an embodiment of the present invention;

[0026] Icons: first screen treatment area 101; gray water collection tank 102; reactive flotation tank 103; horizontal flow primary sedimentation tank 104; second screen treatment area 105; return sludge denitrification tank 201; anaerobic tank 202; anoxic tank 203; MBBR tank 204; secondary sedimentation tank 205; coagulation sedimentation tank 206; filter cloth filter 207; ultraviolet disinfection tank 208; sludge collection tank 301; sludge thickening tank 302. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0031] The block diagrams shown in the accompanying drawings are only functional entities and do not necessarily correspond to physically independent entities. The flowcharts shown in the accompanying drawings are only exemplary illustrations and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to the actual situation.

[0032] First embodiment

[0033] See also Figure 1 This embodiment provides a high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device, which uses the underground first floor and the second floor of the factory building as sewage treatment areas. By using the underground first floor and the second floor as sewage treatment sites in the gelatin production process and the ground as the production plant area, it can save space, reduce construction costs and approval costs, etc., including:

[0034] The wastewater treatment workshop on the underground floor includes a first grid treatment area 101, an ash water collection tank 102, a reaction flotation tank 103, and a horizontal flow primary sedimentation tank 104, which are connected in sequence. The first grid treatment area 101 includes multi-level partition parallel processing to improve the processing efficiency. Each level of partition adopts three grids of coarse 30mm + medium 20mm + fine 5mm, and then the wastewater is pre-treated in sequence through the ash water collection tank 102, the reaction flotation tank 103, and the horizontal flow primary sedimentation tank 104; the drainage channels of the wastewater from the pickling workshop, the wastewater from the phosphate and calcium workshop, and the wastewater from the liming workshop are connected to the water inlet channel of the grid treatment area, and the drainage channels of the wastewater from the degreasing workshop and the wastewater from the submission workshop are connected to the water inlet channel of the horizontal flow primary sedimentation tank 104 through the second grid treatment area 105;

[0035] The design water depth of the horizontal flow primary sedimentation tank 104 is 5m, the average flow retention time is 15min, and the peak flow retention time is 7.5min. Two sets of bridge-type sludge suction machines and two sets of mud-water separators are installed in the horizontal flow primary sedimentation tank 104 to meet the sewage confluence and parallel treatment needs of the gelatin production workshop.

[0036] The underground second-floor wastewater treatment workshop includes a return sludge denitrification tank 201, an anaerobic tank 202, an anoxic tank 203, an MBBR tank 204, a secondary sedimentation tank 205, a coagulation sedimentation tank 206, a filter cloth filter 207, and an ultraviolet disinfection tank 208, which are connected in sequence; 30% of the wastewater treated in the horizontal flow primary sedimentation tank 104 is connected to the return sludge denitrification tank 201 through a pipeline, and 70% of the wastewater is connected to the anaerobic tank 202 for treatment. The drainage channel of the return sludge denitrification tank 201 is connected to the water inlet channel of the anaerobic tank 202, the mixed liquor of the MBBR tank 204 flows back to the anoxic tank 203, the mixed liquor of the secondary sedimentation tank 205 flows back to the return sludge denitrification tank 201, and 40% of the sludge in the secondary sedimentation tank 205 flows back to the return sludge denitrification tank 201.

[0037] On the first underground floor, the first grid treatment area 101 and the second grid treatment area 105 are used to treat gelatin wastewater from different workshops respectively, effectively removing coarse matter and fine residue such as bone particles, bone residue, sebum, etc., and then further sedimentation is carried out in the gray water collection tank 102, and the horizontal flow primary sedimentation tank 104 first removes calcium in the wastewater to reduce the blockage of the aeration device, and performs preliminary treatment. The pretreated gelatin production wastewater enters the biological reaction treatment layer on the second underground floor, where the second underground floor mainly includes a return sludge denitrification tank 201, an anaerobic tank 202, an anoxic tank 203, and an MBBR tank 204. Compared with traditional biochemical treatment tanks, it adopts a simultaneous nitrification and denitrification process, which has the advantages of short reaction time, saving carbon source and reducing reactor volume, thereby improving the treatment efficiency of the device for ammonia nitrogen.

[0038] In this scheme, the return sludge denitrification tank 201, the anaerobic tank 202, the anoxic tank 203, and the MBBR tank 204 are used as biochemical treatment tanks, which mainly use microorganisms to decompose the organic matter that is difficult to degrade in the gelatin production process into small molecules, and 30% of the sewage passes through the return sludge denitrification tank 201 for preliminary denitrification reaction, and 70% of the sewage passes through the anaerobic tank 202 to hydrolyze, acidify and methanize the organic matter, remove the organic matter in the wastewater, and improve the biodegradability of the sewage, which is beneficial to the subsequent MBBR tank 204 treatment, and then the sewage after the respective treatments enters the anoxic tank 203 at the same time, and denitrifies to remove nitrate nitrogen, and removes part of the BOD at the same time, and then enters the MBBR tank 204 together, and uses aerobic bacteria to decompose the biological mass of organic matter, and decomposes the organic matter into CO2 and H2O to achieve the purpose of water purification.

[0039] The mixed form of the return sludge denitrification tank 201, the anaerobic tank 202, the anoxic tank 203, and the MBBR tank 204 forms a large environment of different sizes in which aerobic and anoxic conditions coexist in the bioreactor, so that the synchronous digestion and denitrification can be partially carried out. At the same time, the temperature of the second underground floor is relatively high, so that the DO concentration in this area is relatively low, thereby forming the anoxic microenvironment required in the denitrification process, providing good environmental conditions. At the same time, the return sludge denitrification tank 201 and the MBBR tank 204 increase the oxygen consumption rate and reduce the penetration ability of dissolved oxygen to the biological flocs and biofilms in the biochemical tank, so that anoxic microenvironments appear in the biological flocs and biofilms, further promoting denitrification and denitrification, so that the return sludge denitrification tank 201 and the MBBR tank 204 have synchronous nitrification and denitrification.

[0040] Wherein, submersible mixers are arranged in the anaerobic tank 202 and the anoxic tank 203, and liftable aerators are arranged in the MBBR tank 204 and the return sludge denitrification tank 201.

[0041] The new gelatin wastewater biochemical treatment device sets the return sludge denitrification tank 201, anaerobic tank 202, anoxic tank 203, and MBBR tank 204 on the second underground floor, utilizing the ground's heat storage function to keep the entire sewage treatment process at a higher temperature even in winter or at night, avoiding the use of blowers and heating and purge equipment to maintain the water temperature of the treatment tank by blowing air, saving energy and equipment, and making the entire nitrification reaction have a better nitrification effect, thereby improving the high ammonia nitrogen treatment efficiency of the gelatin wastewater biochemical treatment device.

[0042] In this embodiment, the gray water collection tank 102 and the reaction flotation tank 103 are both provided with aeration devices. Coagulant polyaluminum chloride and flocculant polyacrylamide are added to the reaction flotation tank 103. After stirring and reacting, the wastewater flows into the horizontal flow primary sedimentation tank 104, which is beneficial to the return sludge denitrification tank 201 for preliminary denitrification reaction and improve the denitrification and deammoniation efficiency.

[0043] The scum in the reaction flotation tank 103, the mud in the grid treatment area, the mud in the gray water collection tank 102, and the mud in the horizontal flow primary sedimentation tank 104 are all discharged to the mud collection tank 301 of the wastewater treatment workshop on the second underground floor. The remaining 50% of the sludge in the secondary sedimentation tank 205 is discharged to the sludge thickening tank 302 on the second underground floor. The mud discharge outlet of the sludge thickening tank 302 and the mud inlet of the mud collection tank 301 are connected. The mud collection tank 301 is pumped into the sludge dewatering machine for dehydration, wherein the supernatant and filtrate and flushing water in the desludging process are pumped back to the horizontal flow primary sedimentation tank 104. The sludge thickening tank 302 is provided with a suspended central drive scraper for fully automatic sludge treatment. The secondary sedimentation tank 205 includes a flocculation reaction zone and a clarification zone. A submersible agitator is provided in the flocculation reaction zone, and a filter is provided in the clarification zone to improve the treatment efficiency of the sedimentation tank.

[0044] In the embodiment, sludge and other microbial treatment media are carried out in the wastewater treatment workshop on the second underground floor. Since most of the sludge is produced on the second underground floor, it is convenient to handle, and the temperature on the second underground floor is relatively high. This environment is conducive to aerobic fermentation of sludge after mechanical dehydration for other uses.

[0045] In order to further improve the sewage treatment effect, this embodiment is also equipped with a filter cloth filter pool 207 and other treatment equipment after the biochemical treatment. The filter cloth filter pool 207 and the ultraviolet disinfection pool 208 are built together. The top and the wall of the filter cloth filter pool 207 are equipped with ultraviolet disinfection lamps. The filter pool is also equipped with a backwash pump, a rotary drive motor, a filter cloth turntable and a central pipe, a submersible sewage pipe, and a sodium hypochlorite discharge pump. The sodium hypochlorite discharge pump is used to put sodium hypochlorite into the filter cloth filter pool 207 for disinfection. Reducing water pollution caused by industrial production is conducive to improving the local water safety level, protecting the health of local residents, and at the same time establishing a good city image and promoting urban development.

[0046] Second embodiment

[0047] A method for using a high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device, using the high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device in the first embodiment, the method for using the high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device includes:

[0048] The wastewater from the ground gelatin production and processing workshop is transported to the first grid treatment area 101 and the second grid treatment area 105 of the underground wastewater treatment workshop through pipelines; the drainage channels of the wastewater from the pickling workshop, the wastewater from the phosphate calcium workshop and the wastewater from the liming workshop are connected to the first grid treatment area 101, and the coarse bone matter and fine residue are removed, and then the wastewater flows by gravity to the ash water collection tank 102 for aeration and sedimentation, and then the supernatant flows by gravity to the reaction flotation tank 103, and the reaction flotation tank 103 is added with coagulant polyaluminum chloride and flocculant polyacrylamide, and after stirring and reacting, the oil and fat and other substances that are not easy to sink in the wastewater are removed; the wastewater is scraped off the scum by the scraper above the flotation tank and then sent to the sludge collection tank 301 for dehydration treatment; then the supernatant of the reaction flotation tank 103 is obtained and collected in the horizontal flow primary sedimentation tank 104 for re-sedimentation;

[0049] The wastewater from the degreasing workshop and the wastewater from the submission workshop are transported to the second grid treatment area 105 through pipelines for treatment and then directly flow into the horizontal flow primary sedimentation tank 104 for sedimentation to wait for the treatment of the supernatant;

[0050] 30% of the supernatant from the horizontal flow primary sedimentation tank 104 is pumped out and enters the return sludge denitrification tank 201 for preliminary deammonification and denitrification, and then enters the anaerobic tank 202, the anoxic tank 203 and the MBBR tank 204 for step-by-step treatment using the activated sludge method. After the mixed liquor from the MBBR tank 204 is precipitated in the secondary sedimentation tank 205, although the effluent has reached the standard, the supernatant is still further treated by adding flocculants to the filter cloth filter 207 and stirring it sufficiently to mix it with the sewage, thereby converting the suspended matter and soluble substances in the sewage into floccules. After the sewage enters the clarification area, the floccules are subjected to the effects of agent adsorption, flocculation, electrochemical reaction and filtration to form relatively large alum flowers, and the flocculants are removed by filtration, interception or precipitation, and are then discharged after disinfection with ultraviolet rays and sodium hypochlorite.

[0051] This embodiment is based on the design of a brand-new high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device, so that the wastewater biochemical treatment device can meet the production progress of the gelatin production industry, especially in winter, the decalcification and deammonia-nitrogen effects are significantly improved compared to the treatment efficiency of the original wastewater biochemical treatment device, and the company's operating costs are significantly reduced.

[0052] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A biochemical treatment device for high-calcium and high-ammonia-nitrogen gelatin wastewater, characterized in that: include: The wastewater treatment workshop on the underground floor includes a first grid treatment area, an ash water collection tank, a reaction flotation tank, and a horizontal flow primary sedimentation tank connected in sequence. The first grid treatment area includes multi-level partitions, and each level of partition adopts three grids of coarse 30mm + medium 20mm + fine 5mm; the drainage channels of the wastewater from the pickling workshop, the wastewater from the phosphate and calcium workshop, and the wastewater from the liming workshop are connected to the water inlet channel of the grid treatment area, and the drainage channels of the wastewater from the degreasing workshop and the wastewater from the submission workshop are connected to the water inlet channel of the horizontal flow primary sedimentation tank through the second grid treatment area; The underground two-story wastewater treatment workshop includes a return sludge denitrification tank, an anaerobic tank, an anoxic tank, an MBBR tank, a secondary sedimentation tank, a coagulation sedimentation tank, a filter cloth filter, and an ultraviolet disinfection tank which are connected in sequence; 30% of the wastewater treated in the horizontal flow primary sedimentation tank is connected to the return sludge denitrification tank through a pipeline, and 70% of the wastewater is connected to the anaerobic tank for treatment. The drainage channel of the return sludge denitrification tank is connected to the water inlet channel of the anaerobic tank, the mixed liquor of the MBBR tank flows back to the anoxic tank, the mixed liquor of the secondary sedimentation tank flows back to the return sludge denitrification tank, and 40% of the sludge in the secondary sedimentation tank flows back to the return sludge denitrification tank.

2. The high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device according to claim 1 is characterized in that: The grey water collection tank and the reaction flotation tank are both provided with aeration devices. Polyaluminium chloride as a coagulant and polyacrylamide as a flocculant are added into the reaction flotation tank, and after stirring and reacting, the wastewater flows into the horizontal flow primary sedimentation tank.

3. The high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device according to claim 1 is characterized in that: The scum in the reaction flotation tank, the mud in the grid treatment area, the mud in the gray water collection tank, and the mud in the horizontal flow primary sedimentation tank are all discharged to the mud collection tank of the wastewater treatment workshop on the second underground floor. The remaining 50% of the sludge in the secondary sedimentation tank is discharged to the sludge thickening tank on the second underground floor. The mud discharge outlet of the sludge thickening tank and the mud inlet of the mud collection tank are connected. The mud collection tank is pumped into a sludge dewatering machine for dehydration, and the supernatant, filtrate and flushing water in the desludging process are pumped and returned to the horizontal flow primary sedimentation tank.

4. The high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device according to claim 1 is characterized in that: The designed water depth of the horizontal flow primary sedimentation tank is 5m, the average flow retention time is 15min, the peak flow retention time is 7.5min, and two sets of bridge-type sludge suction machines and two sets of mud-water separators are arranged in the horizontal flow primary sedimentation tank.

5. The high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device according to claim 1 is characterized in that: Submersible mixers are arranged in the anaerobic tank and the anoxic tank, and a liftable aerator is arranged in the MBBR tank.

6. The high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device according to claim 1 is characterized in that: The filter cloth filter tank and the ultraviolet disinfection tank are built together. The top and the wall of the filter cloth filter tank are provided with ultraviolet disinfection lamps. The filter tank is also provided with a backwash pump, a rotary drive motor, a filter cloth turntable and a central pipe, a submersible sewage pipe, and a sodium hypochlorite unloading pump. The sodium hypochlorite unloading pump is used to put sodium hypochlorite into the filter cloth filter tank for disinfection.

7. The high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device according to claim 3 is characterized in that: The sludge thickening tank is provided with a suspended central transmission sludge scraper.

8. The high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device according to claim 1 is characterized in that: The secondary sedimentation tank comprises a flocculation reaction zone and a clarification zone. A submersible agitator is arranged in the flocculation reaction zone, and a filter is arranged in the clarification zone.

9. A method for using a biochemical treatment device for high-calcium and high-ammonia-nitrogen gelatin wastewater, characterized in that: The high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device according to any one of claims 1 to 8 is used, and the method for using the high-calcium and high-ammonia-nitrogen gelatin wastewater biochemical treatment device comprises: The wastewater from the ground gelatin production and processing workshop is transported to the first grid treatment area and the second grid treatment area of ​​the underground wastewater treatment workshop through pipelines; the drainage channels of the wastewater from the pickling workshop, the wastewater from the phosphate calcium workshop and the wastewater from the liming workshop are connected to the first grid treatment area to remove coarse bone matter and fine slag, and then flow to the ash water collection tank for aeration and sedimentation, and then the supernatant flows to the reaction flotation tank, where coagulant polyaluminum chloride and flocculant polyacrylamide are added, and after stirring and reacting, oils and other substances that are not easy to sink in the wastewater are removed; the wastewater is scraped off the scum by the scraper above the flotation tank and then sent to the sludge collection tank for dehydration treatment; then the supernatant from the reaction flotation tank is collected in the horizontal flow primary sedimentation tank for further sedimentation; The wastewater from the degreasing workshop and the wastewater from the submission workshop are transported to the second grid treatment area through pipelines for treatment and then directly flow into the horizontal flow primary sedimentation tank for sedimentation and waiting for the treatment of the supernatant; 30% of the supernatant from the horizontal flow primary sedimentation tank is pumped out by a pump and enters the return sludge denitrification tank for preliminary deammonification and denitrification, and then enters the anaerobic tank, anoxic tank and MBBR tank for step-by-step treatment using the activated sludge method. After the mixed liquor from the MBBR tank is precipitated in the secondary sedimentation tank, although the effluent has reached the standard, the supernatant is still further treated by adding flocculants to the filter cloth filter tank and stirring it thoroughly to mix it with the sewage, thereby converting the suspended matter and soluble substances in the sewage into floccules; after the sewage enters the clarification area, the floccules are subjected to the action of agent adsorption, flocculation, electrochemical reaction and filtration to form relatively large alum flowers, and the flocculants are removed by filtration, interception or precipitation, and are discharged after disinfection with ultraviolet rays and sodium hypochlorite.

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