CN106277480B - Treatment process of high-concentration ammonia nitrogen wastewater - Google Patents
Treatment process of high-concentration ammonia nitrogen wastewater Download PDFInfo
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- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02F1/00—Treatment of water, waste water, or sewage
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Abstract
The invention discloses a treatment process of high-concentration ammonia nitrogen wastewater, which comprises the following steps: pumping the high ammonia nitrogen wastewater in the workshop into a sewage collecting tank, detecting the ammonia nitrogen index of the wastewater, and diluting and adjusting the ammonia nitrogen value of the high ammonia nitrogen wastewater to be in a proper range through tap water according to the detection index; pumping the high ammonia nitrogen wastewater of the collecting tank into a micro-electrolytic tank, adding hydrochloric acid to adjust the pH value, and aerating in the micro-electrolytic tank; after aeration is finished, pumping the wastewater into a coagulation reaction tank, adding a trace amount of polyaluminium chloride and polyacrylamide solution while stirring, overflowing the wastewater after coagulation reaction to a coagulation sedimentation tank for sedimentation, and overflowing supernatant into a turning point chlorination tank; under the condition of stirring, slowly adding a sodium hypochlorite solution into a breakpoint chlorination tank to perform oxidation reaction; the ammonia nitrogen wastewater treatment process provided by the invention obviously expands the application range of the method for treating ammonia nitrogen wastewater, greatly reduces the usage amount of sodium hypochlorite and the treatment cost, and obviously improves the treatment efficiency of high-concentration ammonia nitrogen wastewater.
Description
Technical Field
The invention relates to a wastewater treatment process, in particular to a treatment process of high-concentration ammonia nitrogen wastewater.
Background
The microelectrolysis sewage treatment technology is a novel water treatment technology combining the traditional adsorption process with an electrochemical process, the microelectrolysis technology is an electrochemical technology for treating the wastewater by using a microelectrolysis process formed by corroding iron-carbon granules as microelectrolytes in an electrolyte solution, and under a certain condition, a large amount of new ecology is generated after the wastewater is subjected to microelectrolysis reaction [ H ]]And Fe2Has high chemical activity, can generate oxidation-reduction reaction with a plurality of components in the wastewater, destroy the molecular structure of some organic substances, break the double bonds of some unsaturated chromophoric groups in the wastewater, destroy the chromophoric groups and remove the chroma; meanwhile, certain substances which are difficult to be biochemically degraded are converted into substances which are easy to biochemically treat, and the biodegradability of the wastewater is greatly improved. Generation of electrode reactionState Fe2+ is a coagulant with very strong adsorption, containment and complexing abilities, which can effectively adsorb organic pollutants in wastewater, at proper pH and O2In the presence of Fe (OH)2And Fe (OH)3And (4) flocculating and settling. In addition, under the action of the electric field around the micro-primary battery, the pollutants existing in a colloid state in the wastewater can complete the electrophoretic deposition process in a very short time. Therefore, the scrap iron micro-electrolysis pretreatment of the degradation-resistant industrial wastewater can play a plurality of roles of adsorption flocculation, oxidation reduction, complexation and the like, and can effectively remove chromaticity, SS and COD in the wastewater. The micro-electrolysis sewage treatment technology is used as a pretreatment method of high-concentration wastewater, has the advantages of wide application range, good treatment effect, low operation cost and the like, and is widely applied to the treatment of wastewater in the industries of dye, electroplating, petrochemical industry, pharmacy, pesticide and the like.
Ammonia is an important industrial raw material and is widely applied to various industries such as pharmacy, food processing, rare earth smelting and the like, but simultaneously, excessive ammonia can become an important component part of environmental pollution, ammonia pollution exists in domestic sewage, high ammonia pollution also exists in various industries such as rare earth, foaming agent, catalyst, pesticide, monosodium glutamate, fertilizer, leather, gunpowder, coking, oil refining, meat processing and the like, the ammonia nitrogen concentration is different from 200mg/L to 100,000mg/L and is far higher than that of the domestic sewage, and even if leachate is generated by landfill, the ammonia concentration is also as high as 1000mg/L to 10000 mg/L. The salt content of the high-ammonia wastewater is usually very high, and the salt content of the high-ammonia wastewater is even up to 16 percent and is far higher than the salt content of seawater by 2 to 4 percent. The existing standard has very strict requirements on ammonia in water, so that the removal of ammonia nitrogen in high-ammonia wastewater becomes an urgent problem to be solved.
The currently adopted high-ammonia wastewater treatment technologies can be divided into three main categories: the first is biological treatment technology, the second is physical and chemical treatment technology, and the third is chemical treatment technology.
The biological treatment mainly comprises short-cut nitrification and denitrification, synchronous nitrification and denitrification and a biochemical oxidation method, and is characterized in that the energy consumption is relatively low, but the treatment period is long, the ammonia nitrogen in the effluent water is difficult to meet the discharge requirement, in particular to the biological oxidation method, the ammonia nitrogen is converted into nitrate nitrogen through aerobic organisms, and because the oxidation period is long, the concentration of suspended matters in the effluent water is high, the mud-water separation is difficult, and the total nitrogen is difficult to meet the standard requirement.
The physicochemical treatment technology can be divided into air stripping technology and heating rectification technology, namely, firstly, ionic high ammonium in the wastewater is converted into free or molecular ammonia through pH adjustment, and then the molecular ammonia is removed from the system through air stripping or heating rectification. The ammonia removal by adopting the stripping technology needs a large amount of air, so the method has the characteristics of large power consumption, easy scaling of a stripping tower, easy generation of secondary pollution, difficult meeting of effluent and the like. The ammonia is removed by adopting the heating rectification technology, the method has the advantages of high ammonia recovery purity and the like, but the ammonia distillation needs heating, and the evaporated gaseous ammonia and the distillate at the bottom of the kettle need cooling capacity for cooling, so the energy consumption is higher, the engineering application is more in the ammonia synthesis industry, but the rectification operation difficulty is high, the effluent generally needs deep treatment, and otherwise, the emission requirement is difficult to meet.
The chemical treatment of ammonia nitrogen is to add magnesium salt and phosphate into the ammonia nitrogen in the wastewater, adjust the pH value of the ammonia nitrogen, convert the ammonia nitrogen into magnesium ammonium phosphate and separate the magnesium ammonium phosphate from a system. The method not only needs to consume a large amount of magnesium chloride, phosphate and the like, but also needs to improve the removal rate of ammonium in engineering, and a considerable part of ammonium salt is still left in a system after treatment, so that the standard reaching or emission requirements are difficult to meet; the other chemical treatment method is a break-point chlorination method, which is a chemical denitrification process for introducing chlorine or sodium hypochlorite into wastewater to oxidize NH3-N in the wastewater into nitrogen. The actual amount of chlorine required for treating ammonia nitrogen wastewater depends on the temperature, the pH value and the ammonia nitrogen concentration. And 9-10 mg of chlorine is needed for oxidizing ammonia nitrogen per gram. The most outstanding advantage of the breakpoint chlorination method is that homogenization can be carried out by correctly controlling the chlorine adding amount, thereby greatly reducing ammonia nitrogen in the wastewater and simultaneously achieving the purpose of disinfecting the wastewater. When the chlorination method is used for treating low-concentration ammonia nitrogen wastewater, the treatment rate can reach 90-100%, the effect is stable, the chlorination method is not influenced by water temperature, the investment is less, and the operation cost is expensive.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a treatment process for treating high-concentration ammonia nitrogen wastewater, which solves the defects of the prior breakpoint chlorination process in the ammonia nitrogen wastewater treatment process, greatly reduces the use amount of sodium hypochlorite and the treatment cost, obviously improves the treatment efficiency of the high-concentration ammonia nitrogen wastewater, and develops resource-saving and environment-friendly treatment processes for the high-concentration ammonia nitrogen wastewater.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the treatment process of the high-concentration ammonia nitrogen wastewater has the innovation points that: the method comprises the following steps:
(1) pumping the high ammonia nitrogen wastewater in the workshop into a sewage collecting tank, detecting the ammonia nitrogen index of the wastewater, and diluting and adjusting the ammonia nitrogen value of the high ammonia nitrogen wastewater to be in a proper range through tap water according to the detection index;
(2) pumping the high ammonia nitrogen wastewater of the collecting tank into a micro-electrolytic tank, adding hydrochloric acid to adjust the pH value, and aerating in the micro-electrolytic tank;
(3) after aeration is finished, pumping the wastewater into a coagulation reaction tank, adding a polyaluminium chloride solution and a polyacrylamide solution while stirring, overflowing the wastewater after coagulation reaction to a coagulation sedimentation tank for sedimentation, and then overflowing supernatant into a turning point chlorination tank;
(4) under the condition of stirring, slowly adding a sodium hypochlorite solution into a breakpoint chlorination tank to perform oxidation reaction;
the reaction mechanism is as follows:
2NH3+3NaClo→N2↑+3H20+3NaCl。
further, in the step (1), the ammonia nitrogen index of the raw water is 40000-120000mg/L, the pH index of the raw water is 6-9, the dilution multiple of the tap water is 1-3 times, and the suitable ammonia nitrogen value range is 8000-30000 mg/L.
Further, in the step (2), the pH value is adjusted to be in a range of 4-7, and the aeration time is 2-5 hours.
Further, in the step (3), the content of the polyaluminium chloride solution is 1-5%, and the content of the polyacrylamide solution is 0.05-0.2%.
Further, in the step (4), the volume ratio of the sodium hypochlorite solution to the raw water is 1-2.5:1, and the oxidation reaction time is 2-5 hours.
The invention has the following beneficial effects: compared with the existing breakpoint chlorination process, the ammonia nitrogen wastewater treatment process provided by the invention is a micro-electrolysis combined breakpoint chlorination method, the application range of the ammonia nitrogen wastewater treatment process is remarkably expanded, the use amount of sodium hypochlorite and the treatment cost are greatly reduced, the treatment efficiency of high-concentration ammonia nitrogen wastewater is obviously improved, the secondary pollution problem and the subsequent treatment step generated by the existing process are avoided, and the resource-saving and environment-friendly production process is developed.
Detailed Description
The invention relates to a treatment process of high-concentration ammonia nitrogen wastewater, which comprises the following steps:
(1) pumping the high ammonia nitrogen wastewater in the workshop into a sewage collecting tank, detecting the ammonia nitrogen index of the wastewater, and diluting and adjusting the ammonia nitrogen value of the high ammonia nitrogen wastewater to be in a proper range through tap water according to the detection index;
(2) pumping the high ammonia nitrogen wastewater of the collecting tank into a micro-electrolytic tank, adding hydrochloric acid to adjust the pH value, and aerating in the micro-electrolytic tank;
(3) after aeration is finished, pumping the wastewater into a coagulation reaction tank, adding a polyaluminium chloride solution and a polyacrylamide solution while stirring, overflowing the wastewater after coagulation reaction to a coagulation sedimentation tank for sedimentation, and then overflowing supernatant into a turning point chlorination tank;
(4) under the condition of stirring, slowly adding a sodium hypochlorite solution into a breakpoint chlorination tank to perform oxidation reaction;
the reaction mechanism is as follows:
2NH3+3NaClo→N2↑+3H20+3NaCl。
as an example, a more specific implementation manner is that in the step (1), the ammonia nitrogen index of the raw water is 40000-120000mg/L, the pH index of the raw water is 6-9, the dilution multiple of the tap water is 1-3 times, and the suitable ammonia nitrogen value range is 8000-30000 mg/L; in the step (2), the pH value is adjusted to be between 4 and 7, and the aeration time is 2 to 5 hours; in the step (3), the content of the polyaluminium chloride solution is 1-5%, and the content of the polyacrylamide solution is 0.05-0.2%; in the step (4), the volume ratio of the sodium hypochlorite solution to the raw water is 1-2.5:1, and the oxidation reaction time is 2-5 hours.
Example 1
A treatment process of high-concentration ammonia nitrogen wastewater comprises the following steps:
(1) pumping 3 cubic high ammonia nitrogen wastewater in a workshop into a sewage collecting tank, and detecting that the ammonia nitrogen index of the wastewater is 76800mg/L and the pH value is 7.98; adding tap water to adjust the ammonia nitrogen value of the high ammonia nitrogen wastewater to 28500mg/L according to the detection index;
(2) pumping 8 cubes of qualified high-ammonia-nitrogen wastewater in the collecting tank into a micro-electrolysis tank, adding hydrochloric acid to adjust the pH value to 4, and aerating the micro-electrolysis tank for 2 hours;
(3) pumping the wastewater into a coagulation reaction tank, adding a polyaluminum chloride solution with the mass concentration of 1% and a polyacrylamide solution with the mass concentration of 0.05% while stirring, overflowing the wastewater after coagulation reaction to a coagulation sedimentation tank for sedimentation, and overflowing a supernatant into a breakpoint chlorination tank; under the condition of stirring, slowly adding 7.5 cubic of sodium hypochlorite solution into a breakpoint chlorination tank for oxidation reaction, wherein the reaction time is 2 hours, and after the reaction is finished, sampling and detecting, wherein the ammonia nitrogen value is 76mg/L, and the ammonia nitrogen removal rate is 99.7%.
Example 2
A treatment process of high-concentration ammonia nitrogen wastewater comprises the following steps:
(1) pumping 3 cubic high ammonia nitrogen wastewater in a workshop into a sewage collecting tank, detecting the ammonia nitrogen index of the wastewater to be 49400mg/L and the pH value to be 7.66, and adding tap water to adjust the ammonia nitrogen value of the high ammonia nitrogen wastewater to be 24700mg/L according to the detection index;
(2) pumping about 6 cubes of qualified high-ammonia-nitrogen wastewater in the collecting tank into a micro-electrolysis tank, adding hydrochloric acid to adjust the pH value to 4, and aerating the micro-electrolysis tank for 5 hours;
(3) pumping the wastewater into a coagulation reaction tank, adding a polyaluminum chloride solution with the mass concentration of 5% and a polyacrylamide solution with the mass concentration of 0.2% while stirring, overflowing the wastewater after coagulation reaction to a coagulation sedimentation tank for sedimentation, and overflowing a supernatant into a breakpoint chlorination tank;
(4) slowly adding 6.5 cubic sodium hypochlorite solution into a breakpoint chlorination tank under the condition of stirring, and carrying out oxidation reaction for 5 hours; after the reaction is finished, sampling detection is carried out, the ammonia nitrogen value is 55mg/L, and the ammonia nitrogen removal rate is 99.8%.
Example 3
(1) Pumping 3 cubic high ammonia nitrogen wastewater in a workshop into a sewage collecting tank, detecting the ammonia nitrogen index of the wastewater to be 8850mg/L and the pH value to be 7.59, and adding tap water to adjust the ammonia nitrogen value of the high ammonia nitrogen wastewater to be 10000mg/L according to the detection index;
(2) pumping 3 cubes of the high ammonia nitrogen wastewater in the collecting tank into a micro-electrolysis tank, adding hydrochloric acid to adjust the pH value to 4.24, and aerating the micro-electrolysis tank for 3 hours;
(3) pumping the wastewater into a coagulation reaction tank, adding a polyaluminum chloride solution with the mass concentration of 2% and a polyacrylamide solution with the mass concentration of 0.12% while stirring, overflowing the wastewater after coagulation reaction to a coagulation sedimentation tank for sedimentation, and overflowing a supernatant into a breakpoint chlorination tank;
(4) under the condition of stirring, slowly adding 3 cubes of sodium hypochlorite solution into a breakpoint chlorination tank, carrying out oxidation reaction for 2 hours, and after the reaction is finished, sampling and detecting to obtain an ammonia nitrogen value of 28mg/L and an ammonia nitrogen removal rate of 99.7%.
| Ammonia nitrogen removal (%) | |
| Example 1 | 99.7％ |
| Example 2 | 99.8 |
| Example 3 | 99.7％ |
As can be seen from the above tables, the removal rate of the high-concentration ammonia nitrogen wastewater in the examples 1, 2 and 3 is above 99.5%, and the treatment efficiency of the high-concentration ammonia nitrogen wastewater is obviously improved.
Compared with the existing breakpoint chlorination process, the ammonia nitrogen wastewater treatment process provided by the invention is a micro-electrolysis combined breakpoint chlorination method, the application range of the ammonia nitrogen wastewater treatment process is remarkably expanded, the use amount of sodium hypochlorite and the treatment cost are greatly reduced, the treatment efficiency of high-concentration ammonia nitrogen wastewater is obviously improved, the secondary pollution problem and the subsequent treatment step generated by the existing process are avoided, and the resource-saving and environment-friendly production process is developed.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
Claims (1)
1. A treatment process of high-concentration ammonia nitrogen wastewater is characterized by comprising the following steps: the method comprises the following steps:
(1) pumping high ammonia nitrogen wastewater in a workshop into a sewage collecting tank, detecting an ammonia nitrogen index of the wastewater, and diluting and adjusting the ammonia nitrogen value of the high ammonia nitrogen wastewater to be in a proper range through tap water according to the detection index, wherein the index of the high ammonia nitrogen wastewater is 40000-120000mg/L, the pH index of the high ammonia nitrogen wastewater is 6-9, the dilution multiple of the tap water is 1-3 times, and the proper ammonia nitrogen value range is 8000-30000 mg/L;
(2) pumping the high ammonia nitrogen wastewater in the sewage collecting tank into a micro-electrolysis tank, adding hydrochloric acid to adjust the pH value to 4, and aerating in the micro-electrolysis tank for 2-5 hours;
(3) after aeration is finished, pumping the wastewater into a coagulation reaction tank, adding a polyaluminum chloride solution and a polyacrylamide solution while stirring, wherein the mass concentration of the polyaluminum chloride solution is 1-5 per mill, the mass concentration of the polyacrylamide solution is 0.05-0.2 per mill, overflowing the wastewater after coagulation reaction to a coagulation sedimentation tank for sedimentation, and then, overflowing a supernatant into a turning point chlorination tank;
(4) under the condition of stirring, slowly adding a sodium hypochlorite solution into the breakpoint chlorination tank, and carrying out oxidation reaction for 2-5h, wherein the volume ratio of the adding amount of the sodium hypochlorite solution to the waste water is 1-2.5: 1.
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| CN107381892A (en) * | 2017-09-09 | 2017-11-24 | 南通意特化工有限公司 | A kind of handling process of high-concentration ammonia nitrogenous wastewater |
| CN108793518A (en) * | 2018-06-25 | 2018-11-13 | 南京中衡元环保科技有限公司 | Ammonia nitrogen waste water treatment method and device |
| CN109516604A (en) * | 2018-12-28 | 2019-03-26 | 广州薪光合环保技术有限公司 | The sewage water treatment method of removal of ammonia and nitrogen |
| CN111995105A (en) * | 2020-07-22 | 2020-11-27 | 华南理工大学 | Urea desorption waste liquid ammonia nitrogen emission reduction and waste water recycling equipment and use method |
| CN113735381A (en) * | 2021-09-23 | 2021-12-03 | 嘉应学院 | Treatment method of water body with high ammonia nitrogen content |
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