CN114180783A - Energy-saving wastewater treatment process for producing fresh pigskin gelatin - Google Patents
Energy-saving wastewater treatment process for producing fresh pigskin gelatin Download PDFInfo
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- CN114180783A CN114180783A CN202111430239.9A CN202111430239A CN114180783A CN 114180783 A CN114180783 A CN 114180783A CN 202111430239 A CN202111430239 A CN 202111430239A CN 114180783 A CN114180783 A CN 114180783A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/10—Temperature conditions for biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention relates to an energy-saving wastewater treatment process for producing fresh pigskin gelatin, which is characterized by comprising the following steps of: s1, introducing the wastewater into a pre-settling tank, and discharging supernatant into an adjusting tank; s2, adjusting the pH value of the wastewater in the adjusting tank to 8.5-9.5, and allowing the wastewater supernatant after secondary precipitation to enter a flocculation reaction tank; s3, introducing hot gas from bottom to top through hot gas column nozzles at the bottom of a mixed flocculant added into the flocculation reaction tank to form a column, heating the hot gas by a solar heat collection plate structure, arranging the hot gas column nozzles in an array, controlling the stirring intensity by controlling the amplitude and the number of hot gas columns sprayed by the hot gas column nozzles, controlling and adjusting the temperature of the wastewater in the flocculation reaction tank by controlling the temperature of the hot gas, and adjusting the temperature of the wastewater to 10-18 ℃; s4, the wastewater after the flocculation reaction enters a primary sedimentation tank, and the supernatant enters a biochemical tank for anaerobic treatment and aerobic treatment. The invention saves resource waste and is beneficial to energy conservation and environmental protection.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to an energy-saving wastewater treatment process for producing fresh pigskin gelatin.
Background
Gelatin (Gelatin) is a high polymer of high molecular polypeptides obtained by purifying and primarily hydrolyzing collagen contained in animal skin, bone, cartilage, ligament, and muscle membrane, and is also called animal Gelatin and fat glue. The gelatin finished product is a colorless or light yellow, transparent or semitransparent and hard amorphous substance, and the white matter quantity is better. The gelatin is insoluble in cold water, but can slowly absorb water to swell and soften, and the gelatin can absorb 5-10 times of water by weight. Gelatin belongs to a macromolecular hydrophilic colloid, is a low-calorie health food with higher nutritive value, can be used for making candy additives, frozen food additives and the like, and is an indispensable raw material in the aspects of photographic films, X-ray films, aviation films, artificial board adhesives, belt adhesives, rubber products, cotton cloth, papermaking and the like in industry.
The production process of the gelatin can generate wastewater which mainly comes from the working procedures of degreasing, pickling, liming, neutralization, gelatin preparation, calcium hydrophosphate production and the like, and the gelatin production wastewater has the following characteristics: the waste water generated in the pickling section and the calcium hydrophosphate production section is acidic and mainly contains organic matters such as Cl, Ca, protein, nucleic acid and the like, wherein the concentration of Cl-ions is up to 20000 mg/L; the waste water in the liming section is alkaline, and the generated waste emulsion mainly contains a large amount of organic matters such as Ca (OH), protein, amino acid and the like.
Generally speaking, the wastewater generated in the production process of gelatin has large water quantity and water quality fluctuation and better biodegradability. In the sewage treatment project mainly based on biochemical treatment, an aeration tank is indispensable and can effectively degrade organic substances in sewage. While excessive Cl has a certain biochemical inhibition effect, the chlorine ions are usually removed by a flocculation precipitation method, and the chlorine ions are mainly flocculated by a flocculating agent to be removed by precipitation, such as a composite flocculating agent. The water temperature has an influence on the flocculation effect of the flocculant, the hydrolysis speed of the flocculant is slow along with the reduction of the water temperature, the Brownian motion strength of particles is also weakened, and the time required for forming flocs is prolonged; further, flocs formed at low temperatures are fine and loose, and the clarification effect is deteriorated.
In addition, flocculation reaction needs stirring, and the stirring of adopting mixer machinery at present mostly causes the electric power energy burden, is unfavorable for energy-concerving and environment-protective.
Disclosure of Invention
In order to solve the technical problems, the invention provides an energy-saving wastewater treatment process for producing fresh pigskin gelatin, wherein an energy-saving device is used for absorbing solar heat energy to heat gas, so that the heating gas is used for providing a water temperature environment required by flocculation reaction, and simultaneously, the stirring requirement is met; thereby improving the efficiency of flocculation reaction and being beneficial to energy conservation and environmental protection.
In order to achieve the purpose, the invention adopts the following technical scheme:
an energy-saving wastewater treatment process for producing fresh pigskin gelatin is characterized by comprising the following steps:
s1, introducing the wastewater into a pre-settling tank, naturally settling, discharging supernatant in the pre-settling tank into an adjusting tank, and discharging sludge in the pre-settling tank into a sludge concentration tank;
s2, adjusting the pH value of the wastewater in the adjusting tank to 8.5-9.5, feeding the supernatant of the wastewater after secondary sedimentation into a flocculation reaction tank, and discharging the sludge in the adjusting tank after secondary sedimentation into a sludge concentration tank;
s3, introducing hot gas from bottom to top through hot gas column nozzles at the bottom of the mixed flocculant added into the flocculation reaction tank to form a column, heating the hot gas by a solar heat collection plate structure, arranging the hot gas column nozzles in an array, controlling the stirring strength by controlling the amplitude and the number of hot gas columns sprayed by the hot gas column nozzles, controlling and adjusting the temperature of the wastewater in the flocculation reaction tank by controlling the temperature of the hot gas, adjusting the temperature of the wastewater to 10-18 ℃, and controlling the ratio of the height of the hot gas columns to the height of the liquid level of the wastewater to be 1: 2-3: 2;
and S4, allowing the wastewater after the flocculation reaction to enter a primary sedimentation tank, naturally settling, allowing the supernatant to enter a biochemical tank for anaerobic treatment and aerobic treatment, and discharging sludge in the primary sedimentation tank into a sludge concentration tank.
Further, each hot air column is composed of a plurality of small hot air columns.
Further, in step S3, the temperature of the wastewater is adjusted to 16-18 ℃.
Further, in step S3, the ratio of the height of the hot gas column to the height of the wastewater liquid level is controlled to 2:3 to 3: 2.
Further, the mixed flocculant comprises FeSO4, PAC and PAM, and the proportion is 100 (25-50) to 10-20.
Further, hot gas circulates between the flocculation reaction tank and the solar heat collecting plate structure, so that heat loss is reduced.
The solar heat collecting plate structure and the flocculation reaction tank outer wall main body form a closed space, a heat collecting cavity is arranged in the solar heat collecting plate structure, the heat collecting cavity is communicated with a high-pressure air pump, the high-pressure air pump is communicated with a hot air main pipe, the hot air main pipe is communicated with a plurality of hot air branch pipes, each hot air branch pipe is communicated with a plurality of hot air column nozzles, the closed space is provided with a circulating air inlet of the heat collecting cavity, air in the heat collecting cavity enters wastewater in the flocculation reaction tank through the high-pressure air pump, the hot air main pipe, the hot air branch pipes and the hot air column nozzles, and the wastewater returns to the heat collecting cavity through the circulating air inlet to complete circulation;
the solar heat collecting plate structure comprises a connecting plate, an end part air inlet header pipe, an end part air outlet header pipe and a plurality of array combined heat collecting units;
each heat collection unit comprises an outer transparent plate and an inner transparent plate, a vacuum cavity is arranged between the outer transparent plate and the inner transparent plate, a heat collection gas cavity is arranged in the inner transparent plate, and a heat collection layer is laid at the bottom in the heat collection gas cavity; the thermal-arrest gas chamber still sets up air inlet and gas outlet, air inlet and gas outlet are for matable shrinkage pool and convex pipe, convex pipe and shrinkage pool seal cooperation for two adjacent lines of thermal-arrest unit seal cooperation, seal cooperation between connecting plate and the thermal-arrest unit makes adjacent two seal cooperation between the thermal-arrest unit.
Furthermore, a fresh air inlet is formed in a closed space formed by the solar heat collecting plate structure and the flocculation reaction tank outer wall main body.
Furthermore, the device also comprises a controller for controlling the frequency and the action of the high-pressure air pump.
Furthermore, the high-pressure air pump and the hot air main pipe are both arranged in a closed space formed by the solar heat collecting plate structure and the flocculation reaction tank outer wall main body.
Furthermore, the circulating gas inlets are provided with a plurality of circulating gas inlets and are arranged on the end part gas inlet main pipe, and each row of heat collecting units corresponds to one circulating gas inlet.
Furthermore, the connecting plate is of a T-shaped plate structure, the outer transparent plate and the inner transparent plate are made of toughened glass, and the heat collection unit is arranged on the connecting plate.
Furthermore, a first sealing gasket is arranged between the connecting plate and each heat collecting unit, and a second sealing gasket is arranged between two adjacent rows of heat collecting units.
Further, the hot gas column spray heads are arranged in an array.
Furthermore, the end part air inlet header pipes and the end part air outlet header pipes are at least two corresponding groups, each group of end part air inlet header pipe and end part air outlet header pipe at least corresponds to two rows of heat collecting units, and two adjacent end part air outlet header pipes are communicated and provided with first electromagnetic valves; the hot gas main pipe is at least two, each hot gas main pipe is provided with a second electromagnetic valve, and the controller controls the actions of the first electromagnetic valve and the second electromagnetic valve.
Has the advantages that: according to the invention, liquid is driven by gas in the flocculation reaction tank, solar heat is conveyed into the flocculation reaction tank, and the temperature of the liquid in the flocculation reaction tank is regulated by heat exchange, so that flocculation reaction is facilitated, the flocculation effect is improved, and the water treatment efficiency is improved; meanwhile, the hot air column sprayed by the hot air column spray head drives liquid, and sewage flows back while rising along with high-pressure air, so that the stirring effect is achieved; each hot air column nozzle jets out a plurality of hot air columns, the water temperature among the hot air columns rises, the flocculation reaction effect is better, so that fine flocculation particles are easier to form, the fine flocculation particles collide with each other to form large particles, then at the backflow position between the adjacent hot air column nozzles, more collisions are generated on the flocculation large particles due to backflow, the concentrated collisions of the larger particles are formed, and the flocculation reaction effect is better facilitated; avoids using a stirrer, saves resource waste and is beneficial to energy conservation and environmental protection.
Drawings
FIG. 1 is a schematic view of the process of the present invention;
FIG. 2 is a schematic view showing the construction of a wastewater treatment apparatus according to the present invention;
FIG. 3 is a schematic plan view of a solar heat collection panel;
FIG. 4 is a schematic view of the cross-sectional structure A-A;
FIG. 5 is a schematic cross-sectional view of a heat collecting unit and a connection plate;
FIG. 6 is a first schematic end view of the heat collection unit;
FIG. 7 is a second schematic end view of the heat collection unit;
FIG. 8 is a schematic view of a cross-sectional structure B-B;
FIG. 9 is a schematic structural view of a connecting plate;
FIG. 10 is a schematic plan view illustrating a solar heat collecting panel according to a second embodiment;
FIG. 11 is a schematic view of the cross-sectional structure A-A of the second embodiment;
in the figure, a solar heat collecting plate structure 1, a heat collecting unit 11, an outer transparent plate 111, an inner transparent plate 112, a vacuum cavity 113, a heat collecting gas cavity 114, a gas outlet 115, a gas inlet 116, a heat collecting layer 117, a second sealing gasket 118, a connecting plate 12, an end gas outlet manifold 13, an end gas inlet manifold 14, a first sealing gasket 15, a first electromagnetic valve 16, a high-pressure gas pump 2, a hot gas manifold 3, a hot gas branch pipe 4, a hot gas column nozzle 5, a circulating gas inlet 6, a flocculation reaction tank 7 and a fresh air inlet 8.
Detailed Description
The invention is further illustrated by the following examples and figures.
Example one
As shown in fig. 1, an energy-saving wastewater treatment process for producing fresh pigskin gelatin, in the embodiment, wastewater comprises three kinds of wastewater including phosphorus-calcium wastewater, liming wastewater and neutralization gelatin extraction wastewater, and the process comprises the following steps:
s1, introducing the wastewater into a pre-settling tank, naturally settling, discharging supernatant in the pre-settling tank into an adjusting tank, and discharging sludge in the pre-settling tank into a sludge concentration tank;
s2, adjusting the pH value of the wastewater in the adjusting tank to 8.5-9.5, feeding the supernatant of the wastewater after secondary sedimentation into a flocculation reaction tank, and discharging the sludge in the adjusting tank after secondary sedimentation into a sludge concentration tank;
s3, introducing hot gas from bottom to top through a hot gas column nozzle at the bottom of a mixed flocculant added into a flocculation reaction tank to form a column, heating the hot gas by a solar heat collection plate structure, circulating the hot gas between the flocculation reaction tank and the solar heat collection plate structure, and reducing heat loss, wherein the hot gas column nozzles are arranged in an array manner, each hot gas column consists of a plurality of small hot gas columns, stirring strength is controlled by controlling the amplitude and the number of the hot gas columns sprayed by the hot gas column nozzle, the temperature of the wastewater in the flocculation reaction tank is controlled and adjusted to 10-18 ℃, the optimal wastewater temperature is preferably 16-18 ℃, the ratio of the height of the hot gas columns to the height of the wastewater liquid level is controlled to be 1: 2-3: 2, and preferably 2: 3-3: 2;
s4, the wastewater after flocculation reaction enters a primary sedimentation tank, after natural sedimentation, the supernatant enters a biochemical tank for anaerobic treatment and aerobic treatment in turn, the used equipment comprises a hydrolysis tank, the method comprises the following steps of treating effluent of the activated sludge aeration tank, enabling the effluent to enter a secondary sedimentation tank for solid-liquid separation, enabling sludge in the secondary sedimentation tank to flow back to a hydrolysis tank according to 60-90% of the volume of the inlet water, enabling the effluent of the hydrolysis tank to enter the anoxic tank for a hydraulic retention time of 6-10 hours, enabling the effluent of the hydrolysis tank to enter the anoxic tank for a hydraulic retention time of 8-12 hours, enabling the sludge in the secondary sedimentation tank to flow back to the anoxic tank according to 40-60% of the volume of the inlet water, enabling the effluent of the anoxic tank to enter the activated sludge aeration tank for nitration reaction, enabling the effluent of the anoxic tank to flow back to the anoxic tank for denitrification, and discharging sludge in a primary sedimentation tank into a sludge concentration tank;
and S5, feeding the supernatant in the secondary sedimentation tank into a biological aerated filter, and feeding the filtrate into a recycling tank.
The mixed flocculant comprises FeSO4, PAC and PAM in a ratio of 100 (25-50) to 10-20, and the temperature is adjusted and matched, so that the PAM has higher sensitivity to temperature than the former two, and the effect of the PAM is unexpectedly good, therefore, the proportion of the PAM is greatly improved, and the flocculation effect of the mixed flocculant in the ratio is greatly enhanced.
Example two
The embodiment is not described in part as the above embodiment.
In the embodiment, the solar heat collecting plate structure 1 and the outer wall main body of the flocculation reaction tank 7 form an enclosed space, a heat collecting cavity is arranged in the solar heat collecting plate structure 1, the heat collecting cavity is communicated with a high-pressure air pump 2, the high-pressure air pump 2 is communicated with a hot air main pipe 3, the hot air main pipe 3 is communicated with a plurality of hot air branch pipes 4, each hot air branch pipe 4 is communicated with a plurality of hot air column nozzles 5, the enclosed space is provided with a circulating gas inlet 6 of the heat collecting cavity, gas in the heat collecting cavity enters wastewater in the flocculation reaction tank 7 through the high-pressure air pump 2, the hot air main pipe 3, the hot air branch pipes 4 and the hot air column nozzles 5, and the wastewater returns to the heat collecting cavity through the circulating gas inlet 6 to complete circulation;
the solar heat collecting plate structure 1 comprises a connecting plate 12, an end part air inlet main pipe 14, an end part air outlet main pipe 13 and a plurality of heat collecting units 11 combined in an array mode;
each heat collecting unit 11 comprises an outer transparent plate 111 and an inner transparent plate 112, a vacuum cavity 113 is arranged between the outer transparent plate 111 and the inner transparent plate 112, a heat collecting gas cavity 114 is arranged in the inner transparent plate 112, a heat collecting layer 117 is laid at the bottom in the heat collecting gas cavity 114, and the heat collecting layer 117 is a black material which is easy to absorb and release heat, and is made of materials commonly used in the prior art; the heat collecting gas cavity 114 is further provided with a gas inlet 116 and a gas outlet 115, the gas inlet 116 or the gas outlet is a concave hole, the gas outlet 115 or the gas inlet 116 can be matched with a convex pipe in the concave hole, the convex pipe is in sealing fit with the concave hole, so that two adjacent rows of heat collecting units 11 are in sealing fit, the connecting plate 12 is in sealing fit with the heat collecting units 11, and two adjacent rows of heat collecting units 11 are in sealing fit.
The solar heat collecting plate structure 1 and the flocculation reaction tank 7 outer wall main body form a closed space which is provided with a fresh air inlet 8 for providing fresh air.
The device also comprises a controller for controlling the frequency and the action of the high-pressure air pump 2.
High-pressure air pump 2 and hot gas house steward 3 all set up in solar panel structure 1 and flocculation reaction 7 outer wall main part constitute airtight space, avoid the waste of heat.
The circulating gas inlets 6 are provided with a plurality of circulating gas inlets and are arranged on an end air inlet main pipe 14, and each row of heat collecting units 11 corresponds to one circulating gas inlet 6.
The connecting plate 12 is a T-shaped plate structure, the outer transparent plate 111 and the inner transparent plate 112 are made of toughened glass, the heat collecting units 11 are placed on the connecting plate 12, two adjacent heat collecting units 11 are directly sleeved and placed, and the installation and the disassembly are very convenient and fast.
A first rubber sealing gasket 15 is arranged between the connecting plate 12 and each heat collection unit 11, two adjacent rows of heat collection units 11 are provided with a second rubber sealing gasket 118 for sealing, and the second rubber sealing gasket comprises a sealing air inlet 116 and an air outlet 115 and a gap between the two adjacent rows of heat collection units 11.
The hot air column nozzles 5 are arranged in an array, which is beneficial to generating a reflux area.
EXAMPLE III
The embodiment is not described in part as the above embodiment.
In this embodiment, the end inlet header pipes 14 and the end outlet header pipes 13 are at least two corresponding groups, each group of end inlet header pipes 14 and end outlet header pipes 13 at least corresponds to two rows of heat collecting units 11, and two adjacent end outlet header pipes 13 are communicated and provided with a first electromagnetic valve 16; the hot gas main pipes 3 are at least two, the hot gas branch pipes 4 connected with each hot gas main pipe 3 are distributed uniformly in a crossed mode, as shown in fig. 11, each hot gas main pipe 3 is provided with a second electromagnetic valve, and the controller controls the action of the first electromagnetic valve 16 and the action of the second electromagnetic valve. The controller controls the heat collecting time and the heat collecting temperature of the air in the heat collecting unit 11 by controlling the first electromagnetic valve 16, and controls the frequency of the high-pressure air pump 2 and the amplitude of the hot air column sprayed by the hot air column spray nozzle 5 by controlling the second electromagnetic valve, thereby controlling the stirring intensity and the temperature in the flocculation reaction tank 7.
All be provided with first sensor in every tip air outlet manifold 13, be provided with the second temperature sensor in the flocculation reaction pond 7, the temperature of liquid in the flocculation reaction pond 7 is 10~18 ℃ through the controller control. By taking PAC and PAM as flocculants as an example, when the temperature is in the range, the influence on the flocculation reaction of the fresh pigskin gelatin wastewater is sensitive, the promotion effect of the hot air column provided by the device on the flocculation reaction can be shown, and the effect is optimal at 16-18 ℃.
In conclusion, the beneficial effects of the invention are as follows: the invention drives liquid through gas, continuously transmits solar heat to the flocculation reaction tank 7 through gas circulation, and finishes the temperature adjustment of the liquid in the flocculation reaction tank 7 through heat exchange, thereby being beneficial to flocculation reaction, improving flocculation effect and improving water treatment efficiency; meanwhile, the hot air columns sprayed by the hot air column nozzles 5 drive liquid, sewage flows back when rising together with high-pressure air, and the stirring effect is achieved, more collision of flocculation particles occurs due to backflow at backflow positions between the adjacent hot air column nozzles 5, and the concentrated collision of the flocculation particles is more beneficial to the flocculation reaction effect; avoids using a stirrer, saves resource waste and is beneficial to energy conservation and environmental protection.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. An energy-saving wastewater treatment process for producing fresh pigskin gelatin is characterized by comprising the following steps:
s1, introducing the wastewater into a pre-settling tank, naturally settling, discharging supernatant in the pre-settling tank into an adjusting tank, and discharging sludge in the pre-settling tank into a sludge concentration tank;
s2, adjusting the pH value of the wastewater in the adjusting tank to 8.5-9.5, feeding the supernatant of the wastewater after secondary sedimentation into a flocculation reaction tank, and discharging the sludge in the adjusting tank after secondary sedimentation into a sludge concentration tank;
s3, introducing hot gas from bottom to top through hot gas column nozzles at the bottom of the mixed flocculant added into the flocculation reaction tank to form a column, heating the hot gas by a solar heat collection plate structure, arranging the hot gas column nozzles in an array, controlling the stirring strength by controlling the amplitude and the number of hot gas columns sprayed by the hot gas column nozzles, controlling and adjusting the temperature of the wastewater in the flocculation reaction tank by controlling the temperature of the hot gas, adjusting the temperature of the wastewater to 10-18 ℃, and controlling the ratio of the height of the hot gas columns to the height of the liquid level of the wastewater to be 1: 2-3: 2;
and S4, allowing the wastewater after the flocculation reaction to enter a primary sedimentation tank, naturally settling, allowing the supernatant to enter a biochemical tank for anaerobic treatment and aerobic treatment, and discharging sludge in the primary sedimentation tank into a sludge concentration tank.
2. The energy-saving wastewater treatment process for producing fresh pigskin gelatin according to claim 1, wherein each hot gas column is composed of a plurality of small hot gas columns.
3. The energy-saving wastewater treatment process for producing fresh pigskin gelatin according to claim 1, wherein in step S3, the temperature of the wastewater is adjusted to 16-18 ℃.
4. The energy-saving wastewater treatment process for producing fresh pigskin gelatin according to claim 1, wherein in step S3, the ratio of the height of the hot gas column to the height of the wastewater liquid level is controlled to 2: 3-3: 2.
5. The energy-saving wastewater treatment process for producing fresh pigskin gelatin according to claim 1, wherein the mixed flocculant comprises FeSO4, PAC and PAM in a ratio of 100 (25-50) to (10-20).
6. An energy-saving wastewater treatment process for producing fresh pigskin gelatin according to claim 1, wherein hot gas is circulated between the flocculation reaction tank and the solar heat collection plate structure to reduce heat loss.
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| CN202111430239.9A CN114180783A (en) | 2021-11-29 | 2021-11-29 | Energy-saving wastewater treatment process for producing fresh pigskin gelatin |
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| CN209155720U (en) * | 2018-09-14 | 2019-07-26 | 石狮市深宝新型环保材料有限公司 | A kind of flocculant delivery device |
| CN113669922A (en) * | 2021-08-06 | 2021-11-19 | 天津瑞格特暖通设备安装工程有限公司 | Solar heating system without liquid medium |
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2021
- 2021-11-29 CN CN202111430239.9A patent/CN114180783A/en active Pending
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| CN2811863Y (en) * | 2005-04-11 | 2006-08-30 | 李成彬 | Air transferring heat type solar water heater |
| CN101294747A (en) * | 2007-04-25 | 2008-10-29 | 富准精密工业(深圳)有限公司 | Natural air conditioner |
| CN204187881U (en) * | 2014-04-12 | 2015-03-04 | 刘宇森 | Solar energy heating heat-conducting system outer layer sleeve |
| WO2017161918A1 (en) * | 2016-03-22 | 2017-09-28 | 新疆国力源投资有限公司 | Straw pulping wastewater treatment system |
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| CN108911365A (en) * | 2018-06-25 | 2018-11-30 | 安徽中环环保科技股份有限公司 | A kind of gelatine wastewater treatment process |
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