Treatment system for amino acid metal chelate wastewater

Abstract

The utility model discloses a treatment system for amino acid metal chelate wastewater. The treatment system comprises an oxidation pond, a solid-liquid separation device, an acid-base adjusting pond, an anaerobic biological membrane pond, an MBBR biochemical pond and a sedimentation pond which are communicated in sequence. The wastewater treated by the treatment system disclosed by the utility model meets the index requirements of reuse or discharge, the treatment of the amino acid metal chelate wastewater is simply and economically realized, and compared with the existing evaporation concentration method, the treatment cost of specific wastewater is greatly reduced, the treatment flow is simplified, and the industrial practical value is very high.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment, in particular to a treatment system for amino acid metal chelate wastewater with low treatment cost and good treatment effect. Background Art

[0002] In the process of producing organic trace elements, although the process wastewater of trace element production enterprises can be recycled, some wastewater will still be generated during the cleaning of equipment and floors in the production workshop. The main pollutants in this wastewater are amino acid salt chelates, including a mixture of more than 20 kinds of amino acids and their salts such as methionine, lysine, glutamic acid, etc. The COD value fluctuates between 2000mg / L-15000mg / L, the metal ion iron value fluctuates between 5000mg / L-20000mg / L, manganese is 500mg / L-1500mg / L, copper is 2mg / L-20mg / L, zinc is 500mg / L-1000mg / L, and the total nitrogen content is approximately between 300-800. Therefore, this part of the wastewater still needs to be effectively treated to meet the standards before it can be discharged or comprehensively utilized.

[0003] At present, the treatment method for the above-mentioned amino acid metal chelate wastewater is usually evaporation concentration, and the concentrated solids are dried and entrusted to qualified manufacturers for treatment. This conventional wastewater treatment method has the problems of high treatment cost and cumbersome process: on the one hand, about 1.2-1.5 tons of steam per ton of wastewater is consumed during evaporation concentration; on the other hand, during the evaporation concentration process, some amino acids volatilize into the water vapor, which has a peculiar smell. The steam after use needs to be passed into the waste gas treatment device for additional treatment before it can be discharged, which greatly increases the energy consumption cost and equipment investment of wastewater treatment. The cost of wastewater treatment is as high as 400 yuan per ton. Utility Model Content

[0004] The utility model provides an amino acid metal chelate wastewater treatment system, which is used to solve the technical problems of high cost and complicated treatment process of the existing amino acid metal chelate wastewater treatment system.

[0005] In order to solve the above technical problems, the technical solution proposed by the utility model is:

[0006] A treatment system for amino acid metal chelate wastewater comprises an oxidation tank, a solid-liquid separation device, an acid-base regulating tank, an anaerobic biofilm tank, an MBBR biochemical tank and a sedimentation tank which are connected in sequence.

[0007] The design idea of ​​the above technical scheme is that the utility model first breaks the complexation of amino acid metal chelates in the wastewater through the oxidation reaction in the oxidation tank, releases the metal elements complexed by the amino acids, and at the same time, the oxidation reaction can also decompose and oxidize part of the organic waste, reducing the load of the subsequent process; then through the precipitation reaction, the precipitant is used to convert the above metal elements into solid substances such as hydroxides and sulfides, and the above solid substances are precipitated in combination with a flocculant, so that the metal elements in the wastewater can be removed; then the anaerobic reaction of anaerobic bacteria in the anaerobic biofilm pool is used to promote the chain breaking and degradation of various amino acid polymer compounds in the wastewater, thereby reducing the COD of the wastewater, and finally the reaction of the MBBR biochemical pool is used to enhance denitrification, further degrade polymer nitrogen-containing compounds, reduce COD and ammonia nitrogen content, and finally make the treated wastewater meet the index requirements for reuse or discharge, and simply and economically realize the treatment of amino acid metal chelate wastewater. Compared with the existing evaporation concentration method, it greatly reduces the treatment cost of specific wastewater, simplifies the treatment process, and has strong industrial practical value.

[0008] As a further preferred embodiment of the above technical solution, the solid-liquid separation device is a filter press device, and the filter press device is selected from any one of a screw press, a plate and frame filter press and a centrifuge.

[0009] As a further preferred embodiment of the above technical solution, the sedimentation tank is connected to the anaerobic biofilm tank through a reflux pipe.

[0010] As a further preferred embodiment of the above technical solution, the treatment system further comprises a sewage collecting and regulating tank, which comprises a sewage collecting tank and a sludge tank which are sequentially arranged and connected, and the water outlet of the sludge tank is connected to the water inlet of the oxidation tank. The water outlet of the solid-liquid separation device is also connected to the sewage collecting tank.

[0011] As a further preferred embodiment of the above technical solution, the treatment system further comprises a clear water tank, the water inlet of the clear water tank is connected to the water outlet of the sedimentation tank, and the clear water tank is connected to the MBBR biochemical tank through a reflux pipeline.

[0012] The utility model has the following beneficial effects:

[0013] The treatment system of the utility model first removes metal elements in wastewater and decomposes part of organic waste through precipitation reaction; then utilizes anaerobic reaction of anaerobic bacteria to promote chain breaking and degradation of various amino acid polymer compounds in wastewater, reduces COD of wastewater, and provides activated sludge substrate for subsequent MBBR process treatment; finally utilizes MBBR biochemical reaction to strengthen denitrification, further degrades polymer nitrogen-containing compounds, reduces COD and ammonia nitrogen content, and finally makes the treated wastewater meet the index requirements for reuse or discharge, and realizes the treatment of amino acid metal chelate wastewater in a simple and economical way. Compared with the existing evaporation concentration method, it greatly reduces the treatment cost of specific wastewater, simplifies the treatment process, and has strong industrial practical value.

[0014] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 This is a process flow chart of the method for treating amino acid metal chelate wastewater according to Example 2 of the utility model;

[0017] Figure 2 It is a structural schematic diagram (cross-sectional view) of the amino acid metal chelate wastewater treatment system of Example 1 of the utility model;

[0018] Figure 3 This is a structural schematic diagram (top view) of the amino acid metal chelate wastewater treatment system of Example 1 of the utility model.

[0019] Legend:

[0020] 1. Sewage collecting tank; 101. First submersible pump; 102. Agitation assembly; 2. Sludge tank; 201. Sludge pump; 3. Oxidation tank; 305. Metering tank for reagent 1; 306. Metering tank for reagent 2; 307. Solid-liquid separation device; 4. Acid-base regulating tank; 401. Blower; 404. Metering tank for reagent 3; 405. Second submersible pump; 5. Anaerobic biofilm tank; 501. Negative pressure fan; 502. Buffer tank; 6. MBBR biochemical tank; 7. Sedimentation tank; 8. Clear water tank. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0022] The physical and chemical indicators of the amino acid metal chelate wastewater treated in each embodiment of the specific implementation manner are as follows: COD value is 12400 mg / L, iron is 16800 mg / L, manganese is 1200 mg / L, copper is 19 mg / L, zinc is 800 mg / L, and nitrogen is 600.

[0023] Embodiment 1:

[0024] The amino acid metal chelate wastewater treatment system used in this embodiment has a structure as follows: Figure 2 and Figure 3 As shown, it includes a sewage regulating tank (including a sewage collecting tank 1 and a sludge tank 2 connected in sequence) with water inlet and water outlet connected in sequence, an oxidation tank 3, a solid-liquid separation device 307 (screw stacking machine), an acid-base regulating tank 4, an anaerobic biofilm tank 5, an MBBR biochemical tank 6, a sedimentation tank 7 and a clear water tank 8; wherein, a stirring component 102 and a first submersible pump 101 are arranged in the sewage collecting tank 1, and a sludge pump 201 is arranged in the sludge tank 2; a reagent 1 metering tank 305 and a reagent 2 metering tank 306 are arranged next to the oxidation tank 3, and the two add reagents to the oxidation tank 6 through a dosing port arranged on the oxidation tank 6; an acid-base regulating tank 4 is provided with a blower 401 and a second submersible pump 405, and a reagent 3 metering tank 404 is provided outside the acid-base regulating tank 4 for adding reagents into the acid-base regulating tank 4; a negative pressure fan 501 and a buffer tank 502 are provided in the anaerobic biofilm tank 5; the outlet of the solid-liquid separation device 307 is also connected with the sewage collecting tank 1 through a pipeline, so that the filtrate flows back to the sewage collecting tank 1; the clear water tank 8 is connected with the MBBR biochemical tank 6 through a reflux pipeline, so that the clear water is reused in the MBBR biochemical tank 6; the sedimentation tank 7 is connected with the anaerobic biofilm tank 5 through a reflux pipeline, so that the microorganisms are reused in the anaerobic biofilm tank 5.

[0025] Embodiment 2:

[0026] The method for treating the amino acid metal chelate wastewater of this embodiment uses the treatment system of Example 1 to treat the wastewater. The process flow chart is as follows: Figure 1 As shown, the specific steps include:

[0027] (1) 1m 3 The amino acid chelate wastewater is sequentially introduced into the sewage collection tank 1 and the sludge tank 2, and then introduced into the oxidation tank 3 and 1 kg of hydrogen peroxide with a concentration of 27.5% is added and stirred for one hour.

[0028] (2) Use lime to adjust the pH of the wastewater system to 8.5, add 2 kg of sodium sulfide, stir for one hour, and then add PAM (5 g / m 3 ) for flocculation, and filtered with a solid-liquid separation device 307 (screw stacker) to obtain filter residue and filtrate, and the filtrate is partially returned to the sewage collection and regulating tank.

[0029] (3) The filtrate is passed into the acid-base adjustment tank 4, adjusted to pH 8 with acid, and then passed into the anaerobic biofilm tank 5. Anaerobic system-enhanced bacteria are added to the anaerobic biofilm tank to react for 80 hours to obtain the filtrate to be treated.

[0030] (4) The filtrate to be treated is passed into the MBBR biochemical tank 6, and composite denitrifying bacteria, anaerobic system strengthening bacteria and aerobic system strengthening bacteria are added, and aeration is carried out using a Roots blower. After 170 hours of treatment, it is passed into the sedimentation tank 7 for sedimentation and filtration, and the clean water is passed into the clean water tank 8 to complete the treatment of the amino acid chelate wastewater; the microorganisms in the sedimentation tank 7 can be reused in the anaerobic biofilm tank 5; the clean water in the clean water tank 8 can be returned to the MBBR biochemical tank 6 for use.

[0031] The clean water was sampled and analyzed, and the physical and chemical indicators of the clean water were: copper = 1.3 mg / L, zinc = 3.0 mg / L, manganese = 2.0 mg / L, iron = 1 mg / L, COD = 78 mg / L, BOD5 = 40 mg / L, odorless, chromaticity = 20 times, PH = 8, which met the reuse index requirements.

[0032] Embodiment 3:

[0033] The method for treating amino acid metal chelate wastewater of this embodiment uses the treatment system of Example 1 to treat the wastewater, and specifically comprises the following steps:

[0034] (1) 1m 3 The amino acid chelate wastewater is sequentially introduced into the sewage collection tank 1 and the sludge tank 2, and then introduced into the oxidation tank 3 and 2 kg of 10% sodium hypochlorite solution is added and stirred for one hour.

[0035] (2) Use lime to adjust the pH of the wastewater system to 9.5, add 3 kg of barium sulfide, stir for one hour, and then add PAC (6 g / m 3 ) for flocculation, and filtered with a solid-liquid separation device 307 (plate and frame filter press) to obtain filter residue and filtrate, and the filtrate is partially returned to the sewage collecting and regulating tank.

[0036] (3) The filtrate is passed into the acid-base adjustment tank 4, adjusted to pH 7 with acid, and then passed into the anaerobic biofilm tank 5. Anaerobic system enhanced bacteria are added to the anaerobic biofilm tank 5 to react for 80 hours to obtain the filtrate to be treated.

[0037] (4) The filtrate to be treated is passed into the MBBR biochemical tank 6, and composite denitrifying bacteria, anaerobic system strengthening bacteria and aerobic system strengthening bacteria are added, and aeration is carried out using a Roots blower. After 170 hours of treatment, it is passed into the sedimentation tank 7 for sedimentation and filtration, and the clean water is passed into the clean water tank 8 to complete the treatment of the amino acid chelate wastewater; the microorganisms in the sedimentation tank 7 can be reused in the anaerobic biofilm tank 5; the clean water in the clean water tank 8 can be returned to the MBBR biochemical tank 6 for use.

[0038] The clean water was sampled and analyzed, and the physical and chemical indicators of the clean water were: copper = 1.7 mg / L, zinc = 4.0 mg / L, manganese = 3.0 mg / L, iron = 1.3 mg / L, COD = 90 mg / L, BOD5 = 45 mg / L, odorless, chromaticity = 27 times, PH = 7, which met the reuse index requirements.

[0039] Embodiment 4:

[0040] The method for treating amino acid metal chelate wastewater of this embodiment uses the treatment system of Example 1 to treat the wastewater, and specifically comprises the following steps:

[0041] (1) 1m 3 The amino acid chelate wastewater is sequentially introduced into the sewage collection tank 1 and the sludge tank 2, and then introduced into the oxidation tank 3 and 0.8 kg of sodium chlorate is added and stirred for one hour.

[0042] (2) The pH of the wastewater system was adjusted to 10 with lime, 2.5 kg of sodium sulfide was added, and after stirring for one hour, PFC (5 g / m 3 ) for flocculation, and filtered with a solid-liquid separation device 307 (plate and frame filter press) to obtain filter residue and filtrate, and the filtrate is partially returned to the sewage collecting and regulating tank.

[0043] (3) The filtrate is passed into the acid-base adjustment tank 4, adjusted to pH 9 with acid, and then passed into the anaerobic biofilm tank 5. Anaerobic system enhanced bacteria are added to the anaerobic biofilm tank 5 to react for 80 hours to obtain the filtrate to be treated.

[0044] (4) The filtrate to be treated is passed into the MBBR biochemical tank 6, and composite denitrifying bacteria, anaerobic system strengthening bacteria and aerobic system strengthening bacteria are added, and aeration is carried out using a Roots blower. After 170 hours of treatment, it is passed into the sedimentation tank 7 for sedimentation and filtration, and the clean water is passed into the clean water tank 8 to complete the treatment of the amino acid chelate wastewater; the microorganisms in the sedimentation tank 7 can be reused in the anaerobic biofilm tank 5; the clean water in the clean water tank 8 can be returned to the MBBR biochemical tank 6 for use.

[0045] The clean water was sampled and analyzed, and the physical and chemical indicators of the clean water were: copper = 1.6 mg / L, zinc = 3.7 mg / L, manganese = 2.1 mg / L, iron = 1.4 mg / L, COD = 86 mg / L, BOD5 = 43 mg / L, odorless, chromaticity = 23 times, PH was 9, meeting the reuse index requirements.

[0046] Embodiment 5:

[0047] The method for treating amino acid metal chelate wastewater of this embodiment uses the treatment system of Example 1 to treat the wastewater, and specifically comprises the following steps:

[0048] (1) 1m 3The amino acid chelate wastewater is sequentially introduced into the sewage collection tank 1 and the sludge tank 2, and then introduced into the oxidation tank 3 and 1.6 kg of Fenton solution is added and stirred for one hour.

[0049] (2) Use lime to adjust the pH of the wastewater system to 12, add 3 kg of barium sulfide, stir for one hour, and then add PAM (5 g / m 3 ) for flocculation, and filtered with a solid-liquid separation device 307 (screw stacker) to obtain filter residue and filtrate, and the filtrate is partially returned to the sewage collection and regulating tank.

[0050] (3) The filtrate is passed into the acid-base adjustment tank 4, adjusted to pH 8 with acid, and then passed into the anaerobic biofilm tank 5. Anaerobic system enhanced bacteria are added to the anaerobic biofilm tank 5 to react for 80 hours to obtain the filtrate to be treated.

[0051] (4) The filtrate to be treated is passed into the MBBR biochemical tank 6, and composite denitrifying bacteria, anaerobic system strengthening bacteria and aerobic system strengthening bacteria are added, and aeration is carried out using a Roots blower. After 170 hours of treatment, it is passed into the sedimentation tank 7 for sedimentation and filtration, and the clean water is passed into the clean water tank 8 to complete the treatment of the amino acid chelate wastewater; the microorganisms in the sedimentation tank 7 can be reused in the anaerobic biofilm tank 5; the clean water in the clean water tank 8 can be returned to the MBBR biochemical tank 6 for use.

[0052] The clean water was sampled and analyzed, and the physical and chemical indicators of the clean water were: copper = 0.9 mg / L, zinc = 2.7 mg / L, manganese = 1.2 mg / L, iron = 0.8 mg / L, COD = 70 mg / L, BOD5 = 35 mg / L, odorless, chromaticity = 27 times, PH = 8, which met the reuse index requirements.

[0053] The operating costs of the wastewater treatment in the above Examples 2-5 are mainly composed of chemicals and electricity, wherein the chemicals are about 25 yuan / ton and the electricity is about 15 yuan / ton, and the total operating cost is about 40 yuan / ton.

[0054] Comparative Example 1:

[0055] This comparative example uses the spray evaporator used in the existing process to evaporate and concentrate the wastewater. The water evaporates into gas and is cooled before being sent to the tail gas treatment system. The non-volatile matter in the wastewater is converted into solid powder and packaged for treatment by the corresponding company. The specific steps include:

[0056] (1) Turn on the blower, induced draft fan and heating steam of the spray concentration tank to control the temperature of the evaporation tank at 100-110°C;

[0057] (2) Turn on the exhaust gas cooling and treatment system and record the readings of the steam flow meter and electric meter of the device;

[0058] (3) 3m 3The amino acid chelate wastewater is pumped into the spray concentration tank, the temperature is controlled at 100-110℃, and the wastewater is atomized and concentrated;

[0059] (4) Opening the discharge air shutoff of the spray concentration tank to collect the concentrated solid powder;

[0060] (5) The evaporated water vapor in the concentration tank is cooled and reused by the condenser, and the tail gas enters the CYH treatment system for treatment;

[0061] (6) After the wastewater is treated, the electricity consumption is 150 kwh and the steam is 4.5 tons, which means that the electricity consumption for evaporating each ton of wastewater is 50 kwh and the steam is 1.5 tons / ton. The operating cost is about 50*0.8+1.5*240=400 yuan / ton. Compared with the treatment method used in the utility model, the wastewater cost increases by 360 yuan / ton. The treatment cost advantage of this patent is significant.

[0062] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A system for treating amino acid metal chelate wastewater, characterized in that: The invention comprises an oxidation tank (3), a solid-liquid separation device (307), an acid-base adjustment tank (4), an anaerobic biofilm tank (5), an MBBR biochemical tank (6) and a sedimentation tank (7) which are connected in sequence.

2. The amino acid metal chelate wastewater treatment system according to claim 1, characterized in that: The solid-liquid separation device (307) is a filter press device, and the filter press device is selected from any one of a screw press, a plate and frame filter press, and a centrifuge.

3. The amino acid metal chelate wastewater treatment system according to claim 1, characterized in that: The sedimentation tank (7) is connected to the anaerobic biofilm tank (5) via a reflux pipe.

4. The amino acid metal chelate wastewater treatment system according to claim 1, characterized in that: It also includes a sewage collecting and regulating tank, which includes a sewage collecting tank (1) and a sludge tank (2) which are arranged in sequence and connected to each other, the water outlet of the sludge tank (2) is connected to the water inlet of the oxidation tank (3), and the water outlet of the solid-liquid separation device (307) is also connected to the sewage collecting tank (1).

5. The amino acid metal chelate wastewater treatment system according to any one of claims 1 to 4, characterized in that: The treatment system further comprises a clear water tank (8), the water inlet of the clear water tank (8) is connected to the water outlet of the sedimentation tank (7), and the clear water tank (8) is connected to the MBBR biochemical tank (6) via a reflux pipe.

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