CN217418467U - Pesticide effluent disposal system - Google Patents
Pesticide effluent disposal system Download PDFInfo
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- CN217418467U CN217418467U CN202221544289.XU CN202221544289U CN217418467U CN 217418467 U CN217418467 U CN 217418467U CN 202221544289 U CN202221544289 U CN 202221544289U CN 217418467 U CN217418467 U CN 217418467U
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Abstract
The application provides a pesticide effluent disposal system, includes: a first wastewater tank, a second wastewater tank, a micro-electrolysis tower, an electric floating tank, a Fenton oxidation tank, a first flocculation sedimentation tank, a comprehensive regulation tank, an anaerobic intermediate sedimentation tank, a nitrification intermediate sedimentation tank and a clean water tank which are sequentially connected in series through process pipelines; the Fenton oxidation tank is connected with an acid metering pump and a hydrogen peroxide feeding pump; the first flocculation sedimentation tank is connected with a first alkali metering pump and a first flocculating agent charging pump. The application provides a pesticide effluent disposal system combines together little electrolysis, electric air supporting, fenton oxidation and biochemical treatment, handles the efficient of pesticide waste water, and the processing procedure is stable, and is thorough to pesticide waste water treatment, and it is stable to go out water.
Description
Technical Field
The application relates to the technical field of wastewater treatment, in particular to a pesticide wastewater treatment system.
Background
Along with the improvement of the agricultural modernization level of China, the pesticide use level in the agricultural production process of China is also improved, and the development of the pesticide industry of China is promoted. According to the data of the national statistical bureau, the yield of the chemical pesticide raw pesticide in China is 208.3 ten thousand tons in 2018. According to incomplete statistics, the amount of the wastewater discharged by the pesticide industry all over the country is about 15 hundred million tons every year, but the treated wastewater accounts for 7 percent of the total amount, and the amount reaching the standard is less, and only accounts for a few percent of the treated wastewater.
The pesticide wastewater is taken as high-concentration toxic organic wastewater which is difficult to treat, and has the outstanding characteristics that: the waste water has complex components, unstable water quality and quantity, poor biodegradability and higher concentration of contained organic matters. If not properly treated, even if only minute amounts of such waste water are mixed into a domestic drinking water supply, long-term consumption of such water supplies may expose residents to corresponding health risks, such as cancer, genetic abnormalities, neurodevelopmental disorders, and compromised immune systems. If discharged without being treated, it also has a serious influence on the surrounding environment, groundwater and aquatic organisms. The traditional treatment mode is generally an electrolytic method or a biological treatment method which selects microfiltration, ultrafiltration, nanofiltration reverse osmosis membrane technology, evaporation, incineration, micro-electrolysis, low voltage and large current. These treatment methods have the defect of incomplete wastewater treatment.
SUMMERY OF THE UTILITY MODEL
The application provides a pesticide wastewater treatment system, which is used for overcoming the defect that the prior art cannot treat wastewater completely.
The application provides a pesticide effluent disposal system, includes: a first wastewater tank, a second wastewater tank, a micro-electrolysis tower, an electric floating tank, a Fenton oxidation tank, a first flocculation sedimentation tank, a comprehensive regulation tank, an anaerobic intermediate sedimentation tank, a nitrification intermediate sedimentation tank and a clean water tank which are sequentially connected in series through process pipelines;
the Fenton oxidation tank is connected with an acid metering pump and a hydrogen peroxide feeding pump;
the first flocculation sedimentation tank is connected with a first alkali metering pump and a first flocculating agent charging pump;
the first wastewater tank is used for storing wastewater generated in a production section of a pesticide production workshop; the second wastewater tank is used for storing wastewater generated in the workshop cleaning process and is mixed with the wastewater discharged from the first wastewater tank;
the concentration of the wastewater stored in the first wastewater tank is higher than that of the wastewater stored in the second wastewater tank;
the comprehensive adjusting tank is used for storing domestic sewage generated by a factory.
Optionally, a second flocculation sedimentation tank is arranged between the nitrification intermediate sedimentation tank and the clean water tank.
Optionally, the second flocculation sedimentation tank is connected with a second alkali metering pump and a second flocculant charging pump.
Optionally, a first aerobic tank is further arranged between the nitrification tanks of the anaerobic intermediate sedimentation tank, and a first aerobic intermediate sedimentation tank is arranged between the first aerobic tank and the nitrification tank.
Optionally, a second aerobic tank and a second aerobic sedimentation tank are connected in series between the nitrification tank and the first aerobic sedimentation tank in sequence.
Optionally, the first flocculation sedimentation tank, the anaerobic intermediate sedimentation tank and the nitrification intermediate sedimentation tank are all connected with a sludge tank, and the sludge tank is connected with a filter press.
Optionally, the second flocculation sedimentation tank is also connected with a sludge tank.
Optionally, the first aerobic intermediate sedimentation tank and the second aerobic intermediate sedimentation tank are both connected with a sludge tank.
Optionally, the anaerobic sedimentation tank is connected back to the anaerobic tank; the nitrification settling tank is connected back to the nitrification tank.
Optionally, the second aerobic intermediate sedimentation tank is connected back to the second aerobic tank.
The application provides a pesticide effluent disposal system combines together little electrolysis, electric air supporting, fenton oxidation and biochemical treatment, has thoroughly pesticide waste water treatment, still has the characteristics of multiple waste water of single treatment, simple operation in addition. The pesticide wastewater treatment system overcomes the defect of incomplete wastewater treatment in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a pesticide wastewater treatment system provided in an embodiment of the present application;
FIG. 2 is a schematic view of a pesticide wastewater treatment system provided in another embodiment of the present application;
FIG. 3 is a schematic view of a pesticide wastewater treatment system provided in yet another embodiment of the present application.
Description of reference numerals:
1. a first wastewater tank;
2. a second wastewater pond;
3. a micro-electrolysis tower;
4. an electro-flotation tank;
5. a Fenton oxidation pond;
51. an acid metering pump;
52. a hydrogen peroxide feeding pump;
6. a first flocculation sedimentation tank;
61. a first alkaline metering pump;
62. first flocculating agent charge pump
7. A comprehensive adjusting tank;
71. an ultrasonic generator;
8. an anaerobic tank;
81. an anaerobic intermediate sedimentation tank;
9. a nitrification tank;
91. a nitrification settling tank;
10. a second flocculation sedimentation tank;
101. a second alkaline metering pump;
102. second flocculating agent charging pump
11. A clean water tank;
12. a first aerobic tank;
121. a first aerobic intermediate sedimentation tank;
13. a second aerobic tank;
131. a second aerobic intermediate sedimentation tank;
14. a sludge tank;
15. and (4) a filter press.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort also belong to the protection scope of the present application.
As shown in fig. 1, the present application provides a pesticide wastewater treatment system comprising: a first wastewater tank 1, a second wastewater tank 2, a micro-electrolysis tower 3, an electro-flotation tank 4, a Fenton oxidation tank 5, a first flocculation sedimentation tank 6, a comprehensive regulation tank 7, an anaerobic tank 8, an anaerobic intermediate sedimentation tank 81, a nitrification tank 9, a nitrification intermediate sedimentation tank 91 and a clean water tank 11 which are sequentially connected in series through process pipelines;
the Fenton oxidation pond 5 is connected with an acid metering pump 51 and a hydrogen peroxide feeding pump 52;
the first flocculation sedimentation tank 6 is connected with a first alkali metering pump 61 and a first flocculant charging pump 62.
The first wastewater tank 1 is used for storing wastewater generated in a production section of a pesticide production workshop; the second wastewater tank 2 is used for storing wastewater generated in the workshop cleaning process and is mixed with the wastewater discharged from the first wastewater tank;
the concentration of the wastewater stored in the first wastewater tank 1 is higher than that of the wastewater stored in the second wastewater tank 2;
the comprehensive adjusting tank 7 is used for storing domestic sewage generated by a factory.
In the application, the wastewater generated in the pesticide production workshop is stored in the first wastewater tank 1, the wastewater comes from the production process of niclosamide, isoprothiolane or metaldehyde, and the wastewater stored in the first wastewater tank 1 has high pesticide content, high toxicity, high salt content and poor biodegradability but relatively small amount.
In the second wastewater tank 2, wastewater generated in a cleaning process of a factory workshop, such as wastewater generated in a cleaning process of the floor of the factory workshop, which has a relatively low pesticide content and a low salt content, and a COD value (i.e., chemical oxygen demand) of several thousand milligrams per liter, is stored. The pesticide waste water direct treatment of high concentration, the requirement to equipment is high, and the processing degree of difficulty is big moreover, consequently mixes high concentration waste water and low concentration waste water at second wastewater disposal basin 2 equal volume, dilutes pesticide, salinity etc. in the high concentration waste water to a reasonable level, for example in second wastewater disposal basin 2, waste water COD after the process is mixed is 20000mg/L, and salinity concentration is 500 mg/L. The second wastewater tank 2 not only plays a role of storing low-concentration wastewater, but also has a role of mixing the low-concentration wastewater with high-concentration wastewater to perform homogenization and equalization.
The micro-electrolysis tower 3 is filled with iron chips, iron carbide which is distributed in a tiny particle state and impurities with chemical potential higher than that of pure iron are contained in the iron chips, when pesticide wastewater flows through, a battery effect is generated, a micro-battery (pesticide wastewater can contain a large amount of electrolytes such as sodium chloride and the like) can be formed between the iron chips and the iron, organic matters in the wastewater are electrolyzed, and the micro-battery can generate a large amount of nascent state Fe in the electrolysis process 2+ And atomic hydrogen can change the structural characteristics of a plurality of organic matters in the wastewater, so that the organic matters are broken, opened, and the like, the COD value of the pesticide wastewater treated by the micro-electrolysis tower 3 is reduced, and the macromolecular organic matters are electrolyzed into micromolecular fragments, so that the treatment load of the subsequent treatment process is reduced. And, the electric field effect around the electrodes of the microbattery can enrich the charged ions and colloids in the solution and deposit on the electrodes to be removed. In addition, ferrous ions and ferric ions generated in the reaction process of the micro battery have strong adsorption and flocculation activities, suspended matters in the wastewater are adsorbed and flocculated, and if the wastewater contains heavy metal ions such as copper ions, lead ions, chromium ions and the like, the iron filings can be reduced and deposited on the surfaces of the iron filings for removal. In addition, the scrap iron arranged in the micro-electrolysis tower 3 can be oxidized to the subsequent FentonThe process provides ferrous ions, and has the advantages of saving medicament and saving cost.
The principle of the electro-flotation tank 4 is that when waste water is electrolyzed, due to electrolysis of water and electrolytic oxidation of organic matters, gases such as hydrogen, oxygen, carbon dioxide, chlorine and the like are generated on the surfaces of the cathode and the anode, and the gases escape in the form of tiny bubbles, and can adhere to impurity particles and oil in water and float to the water surface in the rising process. During electrolysis, the bubbles float upwards, and flocculation, coprecipitation, electrochemical oxidation, electrochemical reduction and the like are also caused.
The fenton oxidation pond 5 is a technology for deeply oxidizing wastewater by using radicals generated by ferrous ions and hydrogen peroxide under a weakly acidic condition, and the fenton oxidation belongs to an advanced oxidation technology. Because waste water flows through little electrolysis tower 3 in this application, wherein can produce ferrous ion, operating personnel detects behind the pH in the fenton oxidation pond 5, utilize acid metering pump 51 with its pH adjust to 3 ~ 5 can, recycle hydrogen peroxide solution charge pump 52 to the fixed quantity throw hydrogen peroxide solution in the fenton oxidation pond 5, utilize the fenton oxidation reaction of waste water to carry out the deep oxidation. The biodegradability of the wastewater is improved, and the COD value of the wastewater is reduced.
The first flocculation sedimentation tank 6 is used for adding alkali liquor into the first alkali metering pump 61 to adjust the pH value of the wastewater to the optimal flocculation pH value of 8-9, then a first flocculant feeding pump 62 is used for feeding a flocculant into the wastewater, and solid particles in the wastewater are removed by the first flocculation sedimentation tank 6 to reduce the treatment load of a subsequent treatment unit.
In an alternative manner, an ultrasonic generator 71 is provided in the integrated conditioning tank 7.
Synthesize equalizing basin 7 for mix domestic sewage and the waste water of first flocculation and precipitation pond 6 output, carry out the even volume of homogeneity and handle, reuse supersonic generator 71 produces the ultrasonic wave, utilize the cavitation of ultrasonic wave, the heat effect etc. to further degrade the organic matter in the waste water, promote the biodegradability of waste water.
The anaerobic tank 8 is an up-flow anaerobic fluidized bed, domesticated anaerobic activated sludge is pre-filled in the tank, wastewater enters the anaerobic tank 8 from the bottom of the anaerobic tank 8 from bottom to top, and treated wastewater flowing out of the upper part of the anaerobic tank 8 enters the anaerobic intermediate sedimentation tank 81 for sedimentation. Set up and sink pond 81 in the anaerobism and can deposit by the anaerobism activated sludge that rivers took out of from anaerobism pond 8, avoid anaerobism activated sludge to cause adverse effect to follow-up operation unit.
The structure of the nitrification tank 9 is the same as that of the anaerobic tank 8, and domesticated nitrification/denitrification bacteria are pre-filled in the nitrification tank 9 to further treat the wastewater, remove ammonia nitrogen in the wastewater and further reduce the COD (chemical oxygen demand) value and the BOD (biological oxygen demand) value of the wastewater.
The clean water tank 11 is mainly used for storing the clean water treated by the devices, directly recycling the clean water or recycling the clean water after being further treated.
The system of this application, in the in-service use, in the high concentration pesticide waste water input second wastewater disposal basin 2 that will save in first wastewater disposal basin 1, mix with the low concentration pesticide waste water in the second wastewater disposal basin 2, the average volume is adjusted, waste water input to little electrolysis tower 3 after will mixing again, the galvanic cell that forms between the indisputable carbon in little electrolysis tower 3 is with waste water electrolysis, reduce the COD value of waste water, improve the biodegradability of waste water, produce ferrous ion simultaneously. The wastewater output from the micro-electrolysis tower 3 enters an electric floating tank 4 again, and the wastewater is electrolyzed to generate gases such as hydrogen, oxygen and the like, so that solid particles in the wastewater are removed by air flotation, and meanwhile, the solid particles can be removed by flocculation and precipitation; the wastewater after electro-flotation treatment enters a Fenton oxidation tank 5, hydrochloric acid is added through an acid metering pump 51 to adjust the pH value of the wastewater to 3-5, hydrogen peroxide is added into the wastewater through a hydrogen peroxide feeding pump 52, and the wastewater is deeply oxidized by Fenton oxidation to further reduce the COD value of the wastewater; inputting the wastewater treated by the Fenton oxidation tank 5 into a first flocculation sedimentation tank 6, adding alkali liquor by using a first alkali metering pump 61 to adjust the pH value of the wastewater to about 9, wherein ferrous hydroxide with coagulation effect is formed by ferrous ions and hydroxyl under the pH value due to the pretreatment of the wastewater by electrolysis and Fenton reagents, and is absorbed by particles with weak negative charges in pollutants in an opposite way to form stable small flocculates, and then adding a flocculating agent into the wastewater by using a first flocculating agent feeding pump 62 to enable the small flocculates to be aggregated and removed.
The wastewater output from the first flocculation sedimentation tank 6 enters the comprehensive regulating tank 7, is mixed with domestic wastewater in the comprehensive regulating tank 7 in a uniform amount, enters the anaerobic tank 8 and is fermented and decomposed by activated sludge containing anaerobic bacteria, the wastewater output from the anaerobic tank 8 enters the anaerobic intermediate sedimentation tank 81 to precipitate sludge carried out by water flow, then the wastewater is input into the nitrification tank 9, ammonia nitrogen in the wastewater is decomposed and removed by the nitrifying bacteria to improve the water quality, the wastewater output from the nitrification tank 9 enters the nitrification intermediate sedimentation tank 91 to precipitate sludge carried out by the water flow, and then clear water obtained by precipitation is input into the clear water tank 11 for storage, or is directly recycled, or is subjected to deepening treatment again and then is recycled.
The application provides a pesticide effluent disposal system jointly uses microelectrolysis, electric air supporting, fenton oxidation and biochemical treatment, and is thorough to pesticide effluent treatment, still has the characteristics of multiple waste water of single treatment, simple operation in addition.
As shown in fig. 2, a second flocculation sedimentation tank 10 is optionally arranged between the nitrification intermediate sedimentation tank 91 and the clean water tank 11.
In this application, set up second flocculation and precipitation pond 10, will follow the solid particle thing flocculation and precipitation in the clear water of nitrifying sedimentation tank 91 output, can further improve the cleanliness factor of play water.
As shown in fig. 2, the second flocculation sedimentation tank 10 is optionally connected with a second alkaline metering pump 101 and a second flocculant addition pump 102.
In the application, the optimal pH of the flocculating agent for flocculation is 8 to 9 for providing a weak alkali environment, according to sampling detection of an operator, the second alkali metering pump 101 quantitatively adds alkali liquor (such as a sodium hydroxide aqueous solution with a concentration of 30% wt) into the second flocculation and precipitation tank 10, the wastewater in the second flocculation and precipitation tank 10 is adjusted to be 8 to 9 weak alkali, and the flocculating agent can be quantitatively added by the second flocculating agent adding pump 102, so that solid particles in the wastewater are aggregated and precipitated.
As shown in fig. 2, optionally, a first aerobic tank 12 is further disposed between the anaerobic intermediate sedimentation tank 81 and the nitrification tank 9, and a first aerobic intermediate sedimentation tank 121 is disposed between the first aerobic tank 12 and the nitrification tank 9.
In the application, the structure of the first aerobic tank 12 is the same as that of the anaerobic tank 8, the acclimated aerobic bacteria activated sludge is filled in the first aerobic tank 12, and an aeration and plug flow device is arranged, so that the oxygen content (dissolved oxygen content is 2-3 mg/L) of the wastewater in the first aerobic tank 12 is met, and the stirring effect is achieved. The first aerobic sedimentation tank 121 is arranged to sediment activated sludge carried in the effluent of the first aerobic tank 12, so that adverse effects on subsequent operation units are avoided. The first aerobic tank 12 is arranged to further degrade organic matters in the wastewater, and the effluent quality is improved.
As shown in fig. 3, optionally, a second aerobic tank 13 and a second aerobic sedimentation tank 131 are connected in series between the nitrification tank 9 and the first aerobic sedimentation tank 121 in sequence.
In this application, the working principle and process of the second aerobic tank 13 and the second aerobic sedimentation tank 131 are the same as those of the first aerobic tank 12 and the first aerobic sedimentation tank 121, and are not described herein again.
The second aerobic tank 13 and the second aerobic intermediate sedimentation tank 131 are arranged to further improve the water quality and improve the wastewater treatment effect.
As shown in fig. 2 or fig. 3, optionally, the first flocculation sedimentation tank 6, the anaerobic intermediate sedimentation tank 81 and the nitrification intermediate sedimentation tank 91 are all connected with a sludge tank 14, and the sludge tank 14 is connected with a filter press 15.
As shown in fig. 2 or fig. 3, optionally, the second flocculation sedimentation tank 10 is further connected with a sludge tank 14.
As shown in fig. 3, optionally, a sludge tank 14 is connected to both the first aerobic sedimentation tank 121 and the second aerobic sedimentation tank 131.
In the application, the first flocculation sedimentation tank 6 and the second flocculation sedimentation tank 10 are connected with the sludge tank 14, and flocculation sedimentation in the first flocculation sedimentation tank 6 and the second flocculation sedimentation tank 10 can be discharged into the sludge tank 14 for centralized treatment; the anaerobic intermediate sedimentation tank 81, the nitrification intermediate sedimentation tank 91, the first aerobic intermediate sedimentation tank 121 and the second aerobic intermediate sedimentation tank 131 are also connected to the sludge tank 14, and the aged activated sludge deposited therein is discharged into the sludge tank 14.
The sludge tank 14 is connected with a filter press 15, the flocculated sediment and the aged activated sludge are subjected to filter pressing and dehydration by the filter press 15, filtrate obtained by filter pressing can be returned to the Fenton oxidation tank 5 for treatment, and filter cakes obtained by filter pressing are treated as hazardous wastes.
Optionally, the anaerobic sedimentation tank 81 is connected back to the anaerobic tank 8; the nitrification settling tank 91 is connected back to the nitrification tank 9.
In this application, sink pond 81 and return and insert anaerobism pond 8 in the anaerobism, the waste water after the processing of 8 upper portions outflows in anaerobism pond gets into and sinks and deposit in the pond 81 in the anaerobism, and operating personnel can take the supernatant to carry out the sample detection, if not up to standard, then discharge the waste water in the anaerobism in the heavy pond 81 into anaerobism pond 8 again and handle again, so circulate, until the effluent quality is up to standard, for example, reduce the COD value of waste water to 500 ~ 600 mg/L. The anaerobic intermediate sedimentation tank 81 is connected back to the anaerobic tank 8, so that the water quality flowing from the anaerobic intermediate sedimentation tank 81 to the next treatment unit can reach the standard.
The principle and process of connecting the nitrification middle sedimentation tank 91 back to the nitrification tank are the same as connecting the anaerobic middle sedimentation tank 81 back to the anaerobic tank 8, and are not described herein again.
In an alternative mode, the first aerobic sedimentation tank 121 is connected back to the first aerobic tank 12; the second aerobic intermediate sedimentation tank 131 is connected back to the second aerobic tank 13. The above-mentioned mode of the first aerobic intermediate sedimentation tank 121 being connected back to the first aerobic tank 12 and the second aerobic intermediate sedimentation tank 131 being connected back to the second aerobic tank 13 is the same as the mode of the anaerobic intermediate sedimentation tank 81 being connected back to the anaerobic tank 8, and the details are not repeated here.
The application provides a pesticide effluent disposal system, its work flow is as follows:
high-concentration wastewater is generated in the process of producing pesticides in factories, for example, the wastewater is generated in the process of producing niclosamide, isoprothiolane or metaldehyde, the wastewater contains high pesticide content and high toxicity, the chemical oxygen demand (COD value) of the wastewater is often hundreds of thousands of milligrams per liter, but the quantity of the wastewater is relatively small, and the wastewater is input into a first wastewater tank 1 for temporary storage. Produce low concentration waste water in the factory workshop cleaning process, pesticide content is lower relatively in this type of waste water, its COD value is at thousands of milligrams per liter, but the volume is big, keep in low concentration waste water input second wastewater disposal basin 2, and with the high concentration waste water input second wastewater disposal basin 2 in the first wastewater disposal basin 1, mix the average volume, for example adjust mixed waste water for the COD value is 20000mg/L, salinity concentration is 500 mg/L's medium concentration's pesticide waste water, in this process, second wastewater disposal basin 2 not only plays the effect of saving low concentration waste water, still have and mix low concentration waste water and high concentration waste water, carry out the effect of homogeneity average volume.
The regulated pesticide wastewater with medium concentration in the second wastewater pool 2 is output to a micro-electrolysis tower 3, iron chips are filled in the micro-electrolysis tower 3, and the iron-carbon micro-electrolysis forms numerous tiny primary cells by utilizing the potential difference between iron-carbon particles. These fine cells are electrochemically reacted in an aqueous solution containing an acidic electrolyte using iron having a low potential as a cathode and carbon having a high potential as an anode. As a result of the reaction, iron is corroded and becomes ferrous ions into solution. Meanwhile, organic matters are reduced, and particularly, chloride ions can be removed from chlorinated organic matters in the micro-electrolysis process, so that the biological toxicity is reduced. The COD value of the pesticide wastewater treated by the micro-electrolysis tower 3 is reduced, and macromolecular organic matters are electrolyzed into micromolecular fragments, so that the treatment load of the subsequent treatment process is reduced.
The wastewater output from the micro-electrolysis tower 3 enters an electro-flotation tank 4, and the wastewater is electrolyzed by direct current, for example, iron electrodes are adopted as a cathode and an anode, the anode loses electrons in the electrolysis process to generate ferrous ions, and water at the cathode obtains electrons to generate hydrogen and hydroxyl. Ferrous ions generated in the process are combined with hydroxide radicals to generate ferrous hydroxide, and the ferrous hydroxide can hydrolyze and polymerize to flocculate solid impurities in the wastewater; the ferrous hydroxide is oxidized by oxygen, and the generated ferric hydroxide not only can flocculate solid particles, but also has a certain oxidation effect; the obtained hydrogen forms fine bubbles to float upwards, so that solid particles, oily matters and flocculates in the wastewater are attached to the surfaces of the bubbles and float upwards to the liquid level for removal.
After micro-electrolysis, the wastewater contains Fe 2+ Adding H 2 O 2 Thereafter, Fenton oxidation was performed. Hydrogen peroxide and catalyst Fe 2+ The resulting oxidation system is commonly referred to as a Fenton reagent. Under the action of the catalyst, the hydrogen peroxide can generate two active hydroxyl radicals, so that the radical chain reaction is initiated and propagated, and the oxidation of organic matters and reducing substances is accelerated. The wastewater output from the electric floating tank 4 enters the Fenton oxidation tank 5, an acid metering pump 51 is firstly utilized to add acid, such as sulfuric acid, into the Fenton oxidation tank 5 to adjust the pH value of the wastewater to the optimal reaction pH value of 3-5, then a hydrogen peroxide feeding pump 52 is utilized to quantitatively feed hydrogen peroxide into the Fenton oxidation tank 5, the Fenton oxidation reaction is utilized to carry out deep oxidation on the wastewater, the biodegradability of the wastewater is improved, and the COD value of the wastewater is reduced.
In the treatment process of the preposed equipment, the wastewater contains a large amount of solid particles, colloid and the like, the wastewater output from the Fenton oxidation tank 5 enters the first flocculation sedimentation tank 6, firstly, the first alkali metering pump 61 is utilized to add alkali liquor such as aqueous solution of sodium hydroxide into the wastewater, the pH value of the wastewater is adjusted to be the optimal flocculation pH value of 8-9, ferrous hydroxide with coagulation effect is formed on the effluent water after being pretreated by electrolysis and a Fenton reagent due to the action of iron ions and hydroxyl radicals, and the ferrous hydroxide is attracted with particles with weak negative charges in pollutants in an opposite attraction manner to form stable floc (also called iron sludge) to be removed. And then a first flocculating agent feeding pump 62 is used for feeding a flocculating agent, such as polyaluminium chloride or polyacrylamide, into the wastewater, and solid particles in the wastewater are removed by using the first flocculation sedimentation tank 6 so as to reduce the treatment load of a subsequent treatment unit.
The wastewater output from the first flocculation sedimentation tank 6 enters the comprehensive adjusting tank 7, and meanwhile, the domestic wastewater generated in the office area or the living area of a factory can be input into the comprehensive adjusting tank 7 and treated after mixing. An ultrasonic generator 71 is arranged in the comprehensive adjusting tank 7, the ultrasonic wave generated by the ultrasonic generator 71 is used for treating the wastewater in the comprehensive adjusting tank 7, the ultrasonic wave is transmitted in the water to generate cavitation bubbles, the cavitation bubbles are instantaneously ruptured to generate high temperature and high pressure, the water can be dissociated to generate hydrogen radicals and hydroxyl radicals, and the radicals can react with organic matters in the wastewater to degrade the organic matters; and the micro jet formed when the cavitation bubbles are broken has strong impact force, so that carbon chains are broken, organic matters are degraded, the organic matters in the wastewater are further degraded under the action of the ultrasonic generator 71 in the comprehensive adjusting tank 7, and the biodegradability of the wastewater is further improved.
The wastewater treated by the comprehensive adjusting tank 7 enters an anaerobic tank 8, the anaerobic tank 8 is an upflow anaerobic fluidized bed, domesticated anaerobic bacteria activated sludge is pre-filled in the tank, the wastewater enters the anaerobic tank 8 from bottom to top from the bottom of the anaerobic tank 8, so that a stirring effect is achieved, the contact probability of the activated sludge and organic matters in the wastewater is increased, the treated wastewater flowing out of the upper part of the anaerobic tank 8 enters an anaerobic sedimentation tank 81 for sedimentation, an operator can take supernatant for sampling detection, if the wastewater does not reach the standard, the wastewater in the anaerobic sedimentation tank 81 is discharged into the anaerobic tank 8 in a back-to-back manner for secondary treatment, and the process is circulated until the effluent quality reaches the standard, for example, the COD value of the wastewater is reduced to 5000-600 mg/L.
Discharging the wastewater with the effluent quality reaching the standard into a nitrification tank 9, wherein the structure of the nitrification tank 9 is the same as that of an anaerobic tank 8, domesticated nitrification/denitrification bacteria are pre-filled in the nitrification tank 9, the wastewater is further treated to remove ammonia nitrogen therein, the COD value of the wastewater is further reduced, the wastewater output from the nitrification tank 9 firstly enters a nitrification sedimentation tank 91, sludge carried out by water flow is precipitated, meanwhile, the water quality output from the nitrification tank 9 is also detected, and if the wastewater is unqualified, the wastewater in the nitrification sedimentation tank 91 is returned into the nitrification tank 9 for nitrification again until the effluent is qualified; and inputting the qualified clear water into the next treatment unit for treatment.
A first aerobic tank 12, a first aerobic intermediate sedimentation tank 121, a second aerobic tank 13 and a second aerobic intermediate sedimentation tank 131 are sequentially connected in series between the anaerobic intermediate sedimentation tank 81 and the nitrification tank 9, the structures and the working principles of the first aerobic tank 12 and the second aerobic tank 13 are the same as those of the anaerobic tank 8, except that acclimated aerobic bacteria are pre-filled in the first aerobic tank 12 and the second aerobic tank 13, and aeration devices are arranged in the first aerobic tank 12 and the second aerobic tank 13 to ensure that the dissolved oxygen in water is more than 2-3 mg/L; the working principle of the first aerobic intermediate sedimentation tank 121 and the second aerobic intermediate sedimentation tank 131 is the same as that of the anaerobic intermediate sedimentation tank 81, and the details are not described herein. The first aerobic tank 12, the first aerobic intermediate sedimentation tank 121, the second aerobic tank 13 and the second aerobic intermediate sedimentation tank 131 are arranged to further reduce the COD value and the BOD value of the wastewater, so that the wastewater is further purified.
The clean water output from the nitrification middle sedimentation tank 91 enters the clean water tank 11 for storage, and can be reused in washing workshops in factories to reduce resource waste or be recycled after being subjected to deepened treatment.
A second flocculation sedimentation tank 10 is arranged between the nitrification intermediate sedimentation tank 91 and the clean water tank 11, the second flocculation sedimentation tank 10 is connected with a second alkali metering pump 101 and a second flocculating agent charging pump 102, the working process and the principle of the second flocculation sedimentation tank 10 are the same as those of the first flocculation sedimentation tank 6, and the details are not repeated here. The second flocculation sedimentation tank 10 is arranged to remove solid impurities in the clean water, so that the cleanliness of the clean water is further improved, and the water quality of the clean water is improved.
The first flocculation sedimentation tank 6 and the second flocculation sedimentation tank 10 are connected with a sludge tank 14, and the flocculation sedimentation in the first flocculation sedimentation tank 6 and the second flocculation sedimentation tank 10 can be discharged into the sludge tank 14 for centralized treatment; the anaerobic intermediate sedimentation tank 81, the nitrification intermediate sedimentation tank 91, the first aerobic intermediate sedimentation tank 121 and the second aerobic intermediate sedimentation tank 131 are also connected to the sludge tank 14, and the aged activated sludge deposited therein is discharged into the sludge tank 14.
The sludge tank 14 is connected with a filter press 15, the flocculated sediment and the aged activated sludge are subjected to filter pressing and dehydration by the filter press 15, filtrate obtained by filter pressing can be returned to the Fenton oxidation tank 5 for treatment, and filter cakes obtained by filter pressing are treated as hazardous wastes.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the 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 application.
Claims (10)
1. A pesticide wastewater treatment system is characterized by comprising a first wastewater pool (1), a second wastewater pool (2), a micro-electrolysis tower (3), an electric floating pool (4), a Fenton oxidation pool (5), a first flocculation sedimentation pool (6), a comprehensive adjusting pool (7), an anaerobic pool (8), an anaerobic intermediate sedimentation pool (81), a nitrification pool (9), a nitrification intermediate sedimentation pool (91) and a clean water pool (11) which are sequentially connected in series through process pipelines;
the Fenton oxidation pond (5) is connected with an acid metering pump (51) and a hydrogen peroxide feeding pump (52);
the first flocculation sedimentation tank (6) is connected with a first alkali metering pump (61) and a first flocculant charging pump (62);
the first wastewater tank (1) is used for storing wastewater generated in a production section of a pesticide production workshop; the second wastewater pool (2) is used for storing wastewater generated in a workshop cleaning process and is mixed with the wastewater discharged from the first wastewater pool;
the concentration of the waste water stored in the first waste water tank (1) is higher than that of the waste water stored in the second waste water tank (2);
the comprehensive adjusting tank (7) is used for storing domestic sewage generated by a factory.
2. The agricultural chemical wastewater treatment system according to claim 1, wherein a second flocculation sedimentation tank (10) is provided between the nitrification settling tank (91) and the clean water tank (11).
3. The agricultural chemical wastewater treatment system according to claim 2, wherein the second flocculation sedimentation tank (10) is connected with a second alkali metering pump (101) and a second flocculant charging pump (102).
4. The pesticidal wastewater treatment system according to claim 1 or 3, wherein a first aerobic tank (12) is further provided between the anaerobic intermediate sedimentation tank (81) and the nitrification tank (9), and a first aerobic intermediate sedimentation tank (121) is provided between the first aerobic tank (12) and the nitrification tank (9).
5. The agricultural chemical wastewater treatment system according to claim 4, wherein a second aerobic tank (13) and a second aerobic sedimentation tank (131) are connected in series between the nitrification tank (9) and the first aerobic sedimentation tank (121) in sequence.
6. The agricultural chemical wastewater treatment system according to claim 5, wherein the first flocculation sedimentation tank (6), the anaerobic intermediate sedimentation tank (81), the nitrification intermediate sedimentation tank (91), the first aerobic intermediate sedimentation tank (121), and the second aerobic intermediate sedimentation tank (131) are each connected with a sludge tank (14).
7. The agricultural chemical wastewater treatment system according to claim 2, wherein the second flocculation sedimentation tank (10) is further connected with a sludge tank (14).
8. The agricultural chemical wastewater treatment system according to claim 6 or 7, wherein a filter press (15) is connected to the sludge tank (14), and the filter press (15) is connected to the Fenton oxidation tank (5).
9. The pesticide wastewater treatment system as set forth in claim 1, wherein the anaerobic settling tank (81) is connected back to the anaerobic tank (8); the nitrification settling tank (91) is connected back to the nitrification tank (9).
10. A pesticide wastewater treatment system according to claim 5, characterized in that the second aerobic sedimentation tank (131) is connected back to the second aerobic tank (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221544289.XU CN217418467U (en) | 2022-06-20 | 2022-06-20 | Pesticide effluent disposal system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221544289.XU CN217418467U (en) | 2022-06-20 | 2022-06-20 | Pesticide effluent disposal system |
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| CN217418467U true CN217418467U (en) | 2022-09-13 |
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| CN202221544289.XU Active CN217418467U (en) | 2022-06-20 | 2022-06-20 | Pesticide effluent disposal system |
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