CN116693012A - Method for sterilizing and cooperatively and rapidly removing ammonia nitrogen in overflow sewage of drainage pipeline containing chlorine disinfectant - Google Patents
Method for sterilizing and cooperatively and rapidly removing ammonia nitrogen in overflow sewage of drainage pipeline containing chlorine disinfectant Download PDFInfo
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000010865 sewage Substances 0.000 title claims abstract description 72
- 239000000460 chlorine Substances 0.000 title claims abstract description 62
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910052801 chlorine Inorganic materials 0.000 title claims abstract description 59
- 239000000645 desinfectant Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000001954 sterilising effect Effects 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 39
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 29
- 244000005700 microbiome Species 0.000 claims abstract description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 238000005660 chlorination reaction Methods 0.000 claims abstract description 7
- 241000894006 Bacteria Species 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims abstract description 5
- 241000700605 Viruses Species 0.000 claims abstract description 4
- DIKBFYAXUHHXCS-UHFFFAOYSA-N bromoform Chemical compound BrC(Br)Br DIKBFYAXUHHXCS-UHFFFAOYSA-N 0.000 claims description 12
- QDHHCQZDFGDHMP-UHFFFAOYSA-N Chloramine Chemical compound ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 claims description 11
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 11
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical group [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 11
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 10
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 9
- 229960001701 chloroform Drugs 0.000 claims description 9
- 241000588724 Escherichia coli Species 0.000 claims description 6
- 229950005228 bromoform Drugs 0.000 claims description 6
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical group ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000002835 absorbance Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 230000000249 desinfective effect Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010790 dilution Methods 0.000 description 5
- 239000012895 dilution Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000002352 surface water Substances 0.000 description 5
- GATVIKZLVQHOMN-UHFFFAOYSA-N Chlorodibromomethane Chemical compound ClC(Br)Br GATVIKZLVQHOMN-UHFFFAOYSA-N 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003651 drinking water Substances 0.000 description 3
- 235000020188 drinking water Nutrition 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- FMWLUWPQPKEARP-UHFFFAOYSA-N bromodichloromethane Chemical compound ClC(Cl)Br FMWLUWPQPKEARP-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002550 fecal effect Effects 0.000 description 2
- 210000003608 fece Anatomy 0.000 description 2
- 230000002779 inactivation Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 206010008631 Cholera Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 208000037386 Typhoid Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 201000004792 malaria Diseases 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 201000008297 typhoid fever Diseases 0.000 description 1
Classifications
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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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C20/00—Chemoinformatics, i.e. ICT specially adapted for the handling of physicochemical or structural data of chemical particles, elements, compounds or mixtures
- G16C20/10—Analysis or design of chemical reactions, syntheses or processes
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Bioinformatics & Computational Biology (AREA)
- Computing Systems (AREA)
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- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The application belongs to the technical field of drainage pipeline water treatment, and relates to a method for sterilizing overflow sewage of a drainage pipeline and cooperatively and rapidly removing ammonia nitrogen. The application discloses a method for sterilizing overflow sewage of a drainage pipeline and cooperatively and rapidly removing ammonia nitrogen, which comprises the following steps: measuring initial concentration of ammonia nitrogen, total nitrogen, microorganisms and disinfectants in overflow sewage and water sample UV 254 And a pH range; calculating the lower limit of the concentration of the added chlorine according to the formula (I), calculating the upper limit of the concentration of the added chlorine according to the formula (II), determining the upper limit and the lower limit of the concentration of the added chlorine, and adding the chlorine into the overflow sewage. The application provides a method for sterilizing and cooperatively and rapidly removing ammonia nitrogen in overflow sewage of a drainage pipeline containing chlorine disinfectant, which can give a proper chlorination range according to the water quality of actual overflow sewage through a model, achieve the effects of sterilizing bacteria and viruses and reducing ammonia nitrogen,the method has the advantages of good penetrating power, high stability, long disinfection duration and relatively low generated disinfection secondary products.
Description
Technical Field
The application belongs to the technical field of drainage pipeline water treatment, and relates to a method for sterilizing overflow sewage of a drainage pipeline and cooperatively and rapidly removing ammonia nitrogen.
Background
In the urban black and odorous water body, the most common problem is that the rain is black, whether the urban combined system overflows in rainy days or the initial rainwater of the diversion system is discharged (overflowed in rainy days), the urban black and odorous water body is caused by the instant black and odorous water in the river channel, besides the overflow in rainy days, part of domestic sewage in sunny days enters the rainwater pipeline for discharge due to the staggered connection or mixed connection of the sewage pipe network, the drought pollution of the rainwater pipeline is also more common, and the overflow pollution of the drainage pipeline is controlled to have important significance for the treatment of black and odorous river channels.
The water disinfection technology effectively reduces the transmission of pathogen microorganisms in water in the public health field, plays an important role in preventing the transmission of water-mediated diseases (cholera, typhoid, malaria and the like) and improves the biological safety of water. Today, disinfection processes are not only used for drinking water, sewage and reclaimed water treatment, but also require disinfection measures. Overflow sewage affecting river channel water quality often contains more fecal coliform (10) 6 Above), COD, SS, nitrogen and phosphorus, if discharged directly into the river without treatment, will bring serious pollution to the river. Therefore, reasonable disinfection measures are necessary for disinfecting the overflow sewage.
At present, the overflow pollution control measures at home and abroad mainly comprise: the method comprises the steps of (1) source control, (2) pipeline system control, (3) midway regulation control and (4) end control. No matter how the runoff amount from the source is reduced, the pipeline system is controlled, a regulating reservoir is built, etc., the overflow pollution in rainy days cannot be avoided under the condition of large rainfall. The overflow pollution flow rate in rainy days is unstable in time change, the pollutant load is huge, and measures are needed to be taken rapidly to reduce the pollution load. Terminal treatment is becoming a significant additional measure in reducing the load of overflow pollution in rainy days.
Coagulation-flocculation in end control, disinfection are two effective control techniques. The coagulation-flocculation can effectively remove the overflowed pollution load (COD, BOD5 and TOC) of the granular rainy days, but the dissolved state ratio of ammonia nitrogen and total nitrogen is more than 55%, and the coagulation-flocculation cannot effectively remove the ammonia nitrogen and total nitrogen.
Disclosure of Invention
The application aims to solve the technical problem of providing a method for sterilizing and cooperatively and rapidly removing ammonia nitrogen in overflow sewage of a drainage pipeline, which can be used for effectively controlling the quantity of escherichia coli, the content of sterilized secondary products and the content of ammonia nitrogen in the overflow sewage, and removing pollutants in the overflow sewage and simultaneously has influence on the environment and ecology.
Aiming at the defects and shortcomings of the prior art, the application considers the disinfection mode of chlorine disinfection. As a disinfection mode with long application time and wide range, the chlorine disinfection has the advantages of mature technology, strong sterilization capability, economy, high efficiency, long duration and the like, not only can effectively reduce the quantity of escherichia coli in overflow sewage, but also can quickly react with ammonia nitrogen in water to generate nitrogen to escape into the atmosphere, and the ammonia nitrogen is removed under cooperative control while the overflow sewage is disinfected.
The application provides a method for sterilizing overflow sewage of a drainage pipeline and cooperatively and rapidly removing ammonia nitrogen by using a chlorine-containing disinfectant, which comprises the following steps:
and measuring the initial ammonia nitrogen concentration (mg/L) of the overflow water sample. Measuring pH and UV of water sample to be treated 254 Water quality parameters such as TN, etc. And determining the ammonia nitrogen removal rate according to the overflow pollution condition and the dilution ratio discharged into the receiving water body. According to the model, the theoretical chlorine adding amount is obtained, and according to the actual situation, the chlorine-containing disinfectant is added at single point or multiple points at recommended positions such as a rain water pipeline inspection well and the tail end of the rain water pipeline.
Specifically, the application relates to a method for sterilizing overflow sewage of a drainage pipeline and cooperatively and rapidly removing ammonia nitrogen, which comprises the following steps:
s1, measuring initial concentration of ammonia nitrogen, total nitrogen, microorganisms and to-be-added hypochlorous acid disinfectant (such as sodium hypochlorite) in overflow sewage and UV (ultraviolet) of overflow sewage water sample 254 Water temperature and pH range;
s2, calculating the lower concentration limit of the chlorination according to the formula (I):
t is the contact time of the disinfectant, min;
c 0 the initial concentration of chlorine is mg/L;
k is a first order kinetic parameter;
d is the instantaneous consumption value of chlorine (namely the consumption of chlorine in reaction with ammonia nitrogen), and mg/L;
N 0 for the initial concentration of the microorganisms it is,
n; the concentration of the microorganism is determined by the concentration of the microorganism,
k' is the chlorine first order decay constant, min -1 ；
S3, calculating the upper limit of the concentration of the chlorinated water according to the formula (II):
THMs＝a×(c 0 -D) b ×(DOC×UV 254 ) c ×T d ×pH e (II)
the THMs are Trichloromethane (TCM), bromoform (TBM), dibromochloromethane (DBCM), monobromodichloromethane (BDCM);
c 0 the concentration of the disinfectant is initially added in mg/L;
d is the instantaneous consumption value of the disinfectant, mg/L;
t is the water temperature;
the pH value is the initial measured pH value of overflow sewage;
DOC is the content of soluble organic carbon in overflowed sewage, mg/L;
UV 254 absorbance of the water sample under 254nm wavelength ultraviolet light;
s4, determining the upper limit and the lower limit of the concentration of the added chlorine, and adding the chlorine into the overflow sewage.
Preferably, in step S1, the microorganism is escherichia coli, or the disinfectant is sodium hypochlorite.
Preferably, in step S2, k' is a chlorine first order decay constant, which belongs to an empirical constant, and can also be obtained through experimental calculation of the change of residual chlorine in water along with time, and the decay constant means: chlorine decays in water by a certain factor even if it does not react with organic matter. For monochloramine, the k 'value is between 0.0001 and 0.0005 and for free chlorine the k' value is between 0.005 and 0.020. k is a first-order kinetic parameter, belongs to an empirical constant, and is obtained by a microorganism attenuation experiment at different time after chlorination: for monochloramine, the k value is between 0.05 and 0.20. For free chlorine, the k value is between 0.1 and 0.5.
Preferably, in step S2, t is the reaction contact time for sodium hypochlorite and overflow sewage, not less than 3 minutes, more preferably not less than 5 minutes, for example 5-30 minutes.
Preferably, in the step S3, the trichloromethane is not more than 0.06mg/L, the bromoform is not more than 0.1mg/L and the dichloromethane is not more than 0.02mg/L according to national standards (national ecological environment series standard).
Preferably, in step S3, according to orthogonal experiments, the value of a is between 1 and 5, the value of b is between 0.2 and 1.0, the value of c is between 0.2 and 1.0, the value of d is between 0.01 and 0.1, and the value of e is between 2 and 8.
Preferably, in step S4, NH is calculated using equation (III) 3 Removal rate:
NH 3 removal rate (%) =a×cl 2 b ×H c ×NH 3 d ×UV 254 e ×TN f (Ⅲ)
If NH 3 The removal rate is not in the target range, and the overflow sewage after the diluted chlorine treatment reaches the target NH 3 The removal rate.
Preferably, in step S4, the point of chlorine addition is selected from one or several of the following positions of the pipe: pipeline inspection well, interception well, pump station forebay.
Preferably, the adding mode comprises:
when the overflow pollution is heavy, the recommended adding point comprises a pipeline inspection well and a interception well (figure 3-A), and when the overflow pollution is light, the recommended adding point comprises the pipeline inspection well and the interception well (figure 3-B).
The technical principle of the method is as follows:
sodium hypochlorite can rapidly react with ammonia nitrogen in water, and a small amount of sodium hypochlorite is added to combine with the ammonia nitrogen to form monochloramine, so that the disinfection effect on overflow sewage is realized, the number of bacteria (escherichia coli) in the overflow sewage is reduced, and the ammonia nitrogen is removed under cooperative control. When the addition of sodium hypochlorite is further improved, monochloramine can continue to combine with the sodium hypochlorite, and even finally nitrogen is formed and dissipated into the atmosphere.
When a small amount of the additive is added:
NaClO+H 2 O→HClO+NaOH
NH 3 +HClO→NH 2 Cl+H 2 O
NH 2 Cl+HClO→NHCl 2 +H 2 O
NHCl 2 +HClO→NCL 3 +H 2 O
when the sufficient amount is added:
2NH 3 +3NaClO→N 2 +3NaCl+3H 2 O。
the application relates to 3 models as follows:
1. disinfection dynamics model
The basic principle in the disinfection model at home and abroad is the Chick law, and the first-order reaction is used for expressing the inactivation rate of microorganisms. Considering the decay of disinfectant along with time, firstly searching a model of decay of disinfectant dosage along with time, and then establishing a disinfection dynamics model, thereby providing technical guidance for disinfection and chlorination of overflow sewage.
C＝(c 0 -D)exp(-k’t) (IV)
t is time, min; c is the concentration of the disinfectant at the moment t, mg/L; c 0 The concentration of the disinfectant is initially added in mg/L; d is the instantaneous consumption value of the disinfectant, mg/L; k' is the primary decay constant of the disinfectant, min -1 。
For monochloramine, the k' value is between 0.0001 and 0.0005.
For free chlorine, the k' value is between 0.005 and 0.020.
The disinfection kinetics model was established after the decay was considered as follows:
t is the time period of time, and the time period of the time period is,min；c 0 the concentration of the disinfectant is initially added in mg/L; k is a first order kinetic parameter; d is the instantaneous consumption value of the disinfectant, mg/L; n (N) 0 For initial microorganism concentration, N is the microorganism concentration within time t, k' is the disinfectant first order decay constant, min -1 。
For monochloramine, the k value is between 0.05 and 0.20.
For free chlorine, the k value is between 0.1 and 0.5.
2. Disinfection secondary product generation model
According to the surface water environment quality standard, reference is made to the in-situ project limit of the surface water of the centralized domestic drinking water, chloroform (0.06 mg/L), bromoform (0.1 mg/L) and dichloromethane (0.02 mg/L). If the overflow sewage is excessively chlorinated, the generated concentration of DBPs (disinfection byproducts) is excessively high, and the influence of secondary risks on the receiving water body is brought. Therefore, an overflow sewage disinfection DBPs generation model is established, and technical guidance is provided for overflow sewage disinfection and chlorination high threshold.
THMs＝a×(c 0 -D) b ×(DOC×UV 254 ) c ×T d ×pH e (II)
THMs are Trichloromethane (TCM), bromoform (TBM), c 0 The concentration of the disinfectant is initially added in mg/L; d is the instantaneous consumption value of the disinfectant, mg/L; t is the water temperature; the pH value is the pH value of overflow sewage; DOC is the content of dissolved organic carbon in overflowed sewage, mg/L and UV 254 Is absorbance of some organic matters in water under 254nm wavelength ultraviolet light.
In a preferred embodiment of the application, a is between 1 and 5, b is between 0.2 and 1.0, c is between 0.2 and 1.0, d is between 0.01 and 0.1, and e is between 2 and 8.
3. Ammonia nitrogen removal rate prediction model
Combining ammonia nitrogen and chlorine reaction dynamics and a common model, selecting a power function model as an ammonia nitrogen reduction guiding model, establishing the model by a large amount of experimental data, and measuring the ammonia nitrogen removal rate and the residual chlorine content in water under different pH conditions (5.5-8.5) and different chlorine adding ratios (5-9) for different ammonia nitrogen initial concentrations (5-30 mg/L). The model is as follows:
NH 3 (removal rate%) =a×cl 2 b ×H c ×NH 3 d ×UV 254 e ×TN f (Ⅲ)
a. b, c, d, e, f is fitted from a number of experimental data.
In a preferred embodiment of the application, a is between 1 and 5, b is between 0.2 and 1.0, c is between 0.2 and 1.0, d is between 0.01 and 0.1, and e is between 2 and 8.
According to the model, the optimal chlorine adding proportion under the target removal rate can be obtained.
The application also provides application of the method for sterilizing and cooperatively and rapidly removing ammonia nitrogen in the overflow sewage of the drainage pipeline, which is used for removing microorganisms and ammonia nitrogen in the overflow sewage of the drainage pipeline, determining a proper chlorination range according to the water quality of the actual overflow sewage, achieving the effects of sterilizing bacteria and viruses and reducing ammonia nitrogen, and controlling the adding amount of the chlorine-containing disinfectant. The treatment time is 5min, preferably 5-30min, and meets the sanitary requirements of overflow sewage disinfection.
Due to the adoption of the technical scheme, compared with the prior art, the application has the following beneficial effects:
1. compared with the traditional overflow sewage treatment technology, the method for sterilizing and cooperatively and rapidly removing ammonia nitrogen by using sodium hypochlorite can sterilize the overflow sewage, and simultaneously cooperatively remove ammonia nitrogen when the quantity of the escherichia coli is controlled to reach the standard, so that the generated product is nitrogen which can be directly dissipated into the atmosphere, and secondary pollution to the environment is avoided.
2. The application provides a method for sterilizing overflow sewage of a drainage pipeline and cooperatively and rapidly removing ammonia nitrogen based on a chlorine-containing disinfectant, which can give a proper chlorine adding range according to the water quality of actual overflow sewage through a model, achieve the effects of sterilizing bacteria and viruses and reducing ammonia nitrogen, and simultaneously reduce the adding amount of the chlorine-containing disinfectant to a certain extent.
3. The application is added in the rain water pipeline inspection well, increases the in-situ disinfection contact time of the rain water pipeline, reduces the dosage of sodium hypochlorite, reduces the ecological influence of residual chlorine on the receiving water body, and simultaneously has good penetration capability, high stability, long disinfection duration and relatively low generated disinfection secondary product (trihalomethane) in the form of chloramine.
4. The application aims at the problems of overflow pollution in rainy days and drought pollution in sunny days in drainage pipe networks. In sunny days, domestic sewage enters the rainwater pipeline for discharge due to the staggered connection or the mixed connection of the sewage pipe network, the sewage flow is lower than the overflow in rainy days, and the chlorine adding amount in the rainwater pipeline is less. According to the application, the problem of black and odorous urban water body caused by excessive pollution load discharge of the drainage pipe network is solved from multiple scenes, and the urban river water quality is effectively improved while the secondary risk of the subsequent river is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that, for some embodiments of the present application, each drawing in the following description can be further obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of ammonia nitrogen reduction guidance model accuracy. And performing linear fitting on the multi-sampling data, and finally screening out an ammonia nitrogen reduction guide model which is closest to the actual ammonia nitrogen reduction guide model.
FIG. 2 is a graph showing the results of ammonia nitrogen removal rates at different pH and different chlorine ratios.
Fig. 3 shows the addition mode under different conditions of overflow pollution in rainy days. Wherein, A is when the overflow pollution is heavy in rainy days, and B is when the overflow pollution is light in rainy days.
Fig. 4 is a dilution ratio of the receiving water 1: inventory of disinfection by-products at 10.
Detailed Description
The technical solutions will be clearly and completely described below by means of embodiments of the present application, it being apparent that the described embodiments are only some of the preferred embodiments of the present application, but not all embodiments. All other embodiments, which are obtained by persons skilled in the art without creative efforts, are included in the protection scope of the present application based on the embodiments of the present application. The methods not specifically mentioned in the present application can be measured by methods conventional in the art, for example, with reference to national ecological environment series standards (herein simply referred to as "national standards").
Example 1 construction of a model
Aiming at the problem of ammonia nitrogen removal of overflow sewage, various related factors are tested. Theoretically, chlorine addition, ammonia nitrogen, nitrate, total nitrogen initial concentration, UV 254 The factors of pH and ammonia nitrogen content in water are related, but the study of the application shows that after the parameters are treated (such as normalized), the influence of some parameters (nitrate) on ammonia nitrogen removal rate is little, and even the calculation result is interfered.
TABLE 1 influence of partial Components in Water on Ammonia Nitrogen removal Rate
From the pearson coefficient, the smaller the coefficient is, the stronger the significance is, and the nitrate is irrelevant to the ammonia nitrogen removal rate. At the same time, according to model fitting, after the nitrate is included to construct a model, the accuracy of the model is reduced (R 2 =0.67), therefore, when the subsequent model is built, the irrelevant factors will be removed, and the model accuracy is improved.
NH 3 (removal rate%) =77.62×cl 2 2.43 ×H 0.165 ×NH 3 0.75 ×NO 3 41.77 R 2 ＝0.67，
NH 3 (removal rate%) =0.089×cl 2 2.23 ×H 0.187 ×NH 3 3.06 ×TN -3.34 R 2 ＝0.84。
Example 2 parameter determination
At the basic determination of chlorine content, pH value and NH 3 Content, UV 254 After the content and the total nitrogen are taken as input values, a model of ammonia nitrogen removal rate is constructed according to the following formula:
NH 3 (removal rate%) =a×cl 2 b ×H c ×NH 3 d ×UV 254 e ×TN f (Ⅲ)
The test and optimization results show that: a=1-5, b=0.2-1.0, c=0.2-1.0, d=0.01-0.1, e=2-8.
Example 3
1. Disinfection dynamics model
The amount of fecal coliform in overflow sewage is 10 6 -10 8 L is a number of -1 Referring to the pollutant emission standard of urban sewage treatment plant in China, the highest emission of the coliform faeces is not more than 10 4 Taking the monochloramine attenuation coefficient of 0.00025, the monochloramine kinetic parameter k is 0.1. Sterilizing for 15min.
According to the disinfection dynamics model, if the coliform group number of the feces is from 10 6 L is a number of -1 Down to 10 4 L is a number of -1 At least chlorine addition (c) 0 D) 3.07mg/L, D being the instantaneous chlorine consumption value of the initial ammonia nitrogen to chlorine reaction to nitrogen fraction.
According to a microbial inactivation model, if the coliform group number of the excrement is from 10 8 L is a number of -1 Down to 10 4 L is a number of -1 At least chlorine addition (c) 0 -D) 6.15mg/L, D being the instantaneous chlorine consumption value of the initial ammonia nitrogen to chlorine reaction to nitrogen fraction.
2. Disinfection secondary product generation model
According to a disinfection secondary product generation model, the water temperature range of overflowed sewage is 5-30 ℃, the pH range is 6.5-8.5, the DOC content is 5-10mg/L, and UV 254 Between 0.05 and 0.2. Suggested chlorine addition amount (c) 0 -D) at 5-25mg/L, THMs are produced in the range 20-200. Mu.g/L. The dilution ratio of the treated water entering the receiving water body is recommended to be more than 10, so that the concentration of the disinfection secondary product is not higher than the in-situ project limit value of the surface water of the centralized domestic drinking water in the surface water environment quality standard.
3. Ammonia nitrogen removal rate prediction model
TABLE 2 Ammonia nitrogen reduction guide model
Collecting an actual water sample, filtering the water sample by a 0.45 mu m membrane, and measuring that the initial ammonia nitrogen concentration is 14mg/L, and the water sample UV 254 And the total nitrogen is 0.101 mg/L, according to the surface water environment quality standard and combined with the pollutant emission standard of urban sewage treatment plants, the ammonia nitrogen concentration of class III water and above is not higher than 1mg/L, and the ammonia nitrogen removal rate is set, and taking 90% as an example, the ammonia nitrogen content in the treated overflow sewage is 1.4mg/L, and the treated overflow sewage enters a receiving water body through subsequent dilution, and the concentration is reduced to below 1 mg/L. Under the condition that various parameters and removal rate targets of an actual water sample are known, a guide chlorine adding ratio of 8.16 can be obtained according to a model, if the target of 90% of ammonia nitrogen removal rate is required to be achieved, the chlorine adding (Cl: N) is required to be 8.16, the actual chlorine adding ratio is 9, the ammonia nitrogen concentration in the treated water sample is measured, and the removal rate is 98.2%, so that the target is achieved.
For a water sample with lower initial ammonia nitrogen concentration, the initial concentration is 5.65mg/L, the water sample UV254 is 0.043, the total nitrogen is 6.95mg/L, the removal rate target is set to be 50% in consideration of the fact that the water sample enters a receiving water body after subsequent dilution and residual chlorine in the water cannot be too high, the chlorine adding ratio is guided to be 5.8 according to model obtaining, the actual chlorine adding ratio is 7, the ammonia nitrogen concentration in the water sample after measurement treatment is 60%, and the removal rate reaches the target.
TABLE 3 influence of chlorine addition ratio on ammonia nitrogen removal Rate
The above-described embodiments are merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be suggested to one skilled in the art without inventive effort are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims in the present application.
Claims (10)
1. A method for sterilizing overflow sewage of a drainage pipeline and cooperatively and rapidly removing ammonia nitrogen is characterized by comprising the following steps:
s1, measuring initial concentrations of ammonia nitrogen, total nitrogen, microorganisms and disinfectants in overflow sewage and water sample UV 254 Water temperature and pH range;
s2, calculating the lower concentration limit of the disinfectant according to a formula (I):
t is time, min; c 0 The concentration of the disinfectant is initially added in mg/L; k is a first order kinetic parameter; d is the instantaneous consumption value of the disinfectant, mg/L; n (N) 0 For initial microorganism concentration, N is the microorganism concentration within time t, k' is the disinfectant first order decay constant, min -1 ；
S3, calculating the upper limit of the concentration of the chlorinated water according to the formula (II):
THMs＝a×(c 0 -D) b ×(DOC×UV 254 ) c ×T d ×pH e (II)
THMs are Trichloromethane (TCM), bromoform (TBM), c 0 The concentration of the disinfectant is initially added in mg/L; d is the instantaneous consumption value of the disinfectant, mg/L; t is the water temperature; the pH value is the pH value of overflow sewage; DOC is the content of dissolved organic carbon in overflowed sewage, mg/L and UV 254 Absorbance of the water sample under 254nm wavelength ultraviolet light;
s4, determining the upper limit and the lower limit of the concentration of the added disinfectant, and adding the disinfectant into the overflow sewage;
the disinfectant is hypochlorous acid disinfectant.
2. The method for disinfecting overflowed sewage of drain pipeline and cooperatively and rapidly removing ammonia nitrogen according to claim 1, wherein in step S1, the microorganism is escherichia coli, or the disinfectant is sodium hypochlorite.
3. The method for collaborative rapid ammonia nitrogen removal by overflow sewage disinfection of a drainage pipeline according to claim 1, wherein in step S2, k value is between 0.05 and 0.20 for monochloramine, or
For free chlorine, the k value is between 0.1 and 0.5.
4. The method for collaborative rapid ammonia nitrogen removal by overflow sewage disinfection of a drain pipeline according to claim 1, wherein in step S2, k' is between 0.0001 and 0.0005 for monochloramine, or
For free chlorine, the k' value is between 0.005 and 0.020.
5. The method for collaborative rapid ammonia nitrogen removal by overflow sewage disinfection of a drainage pipeline according to claim 1, wherein t is not less than 3 minutes in step S2.
6. The method for collaborative rapid ammonia nitrogen removal by overflow sewage disinfection of a drainage pipeline according to claim 1, wherein in step S3, chloroform is not more than 0.06mg/L, bromoform is not more than 0.1mg/L, and dichloromethane is not more than 0.02mg/L.
7. The method for collaborative rapid ammonia nitrogen removal by overflow sewage disinfection of a drainage pipeline according to claim 1, wherein in the step S3, a value is between 1 and 5, b value is between 0.2 and 1.0, c value is between 0.2 and 1.0, d value is between 0.01 and 0.1, and e is between 2 and 8.
8. The method for collaborative rapid ammonia nitrogen removal by overflow sewage disinfection of a drainage pipeline according to claim 1, wherein in step S4, NH is calculated using formula (iii) 3 Removal rate:
NH 3 removal rate (%) =a×cl 2 b ×H c ×NH 3 d ×UV 254 e ×TN f (Ⅲ)
If NH 3 The removal rate is not in the target range, and the overflow sewage after the diluted chlorine treatment reaches the target NH 3 The removal rate.
9. The method for collaborative rapid ammonia nitrogen removal by overflow sewage disinfection of a drainage pipeline according to claim 1, wherein in step S4, the chlorine adding point is selected from one or several of the following positions of the pipeline: pipeline inspection well, interception well, pump station forebay.
10. The application of the method for sterilizing and cooperatively and rapidly removing ammonia nitrogen in the overflow sewage of the drainage pipeline according to claim 1 is characterized in that the microorganism and ammonia nitrogen in the overflow sewage of the drainage pipeline are removed by using the method for sterilizing and rapidly removing ammonia nitrogen in the overflow sewage of the drainage pipeline, and the proper chlorination range is determined according to the water quality of the actual overflow sewage, so that the effects of sterilizing bacteria and viruses and reducing ammonia nitrogen are achieved, and the addition amount of the chlorine-containing disinfectant is controlled.
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| CN117524343A (en) * | 2023-11-09 | 2024-02-06 | 深圳市嗨西西科技有限公司 | Pet disinfection evaluation method and system based on hypochlorous acid preparation |
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