CN110697932B - Method for controlling disinfection byproducts of drinking water by surface water - Google Patents
Method for controlling disinfection byproducts of drinking water by surface water Download PDFInfo
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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
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Abstract
The invention discloses a method for controlling disinfection byproducts of drinking water by surface water, in particular discloses a method for controlling disinfection byproducts by potassium permanganate pre-oxidation, coagulating sedimentation and ceramic membrane filtration, and belongs to the technical field of environmental engineering drinking water treatment. Compared with the traditional water treatment (coagulation-precipitation-sand filtration) method, the method adds a potassium permanganate pre-oxidation process before the coagulation precipitation, and can improve the removal efficiency of organic matters in water in the coagulation process by combining the process of adding coagulant in multiple times with the process of adding coagulant in multiple times.
Description
Technical Field
The invention relates to a method for controlling disinfection byproducts of drinking water by surface water, in particular to a method for controlling disinfection byproducts by potassium permanganate pre-oxidation, coagulating sedimentation and ceramic membrane filtration, belonging to the technical field of drinking water treatment in environmental engineering.
Background
With the continuous development of social economy, surface water is polluted to different degrees, so in the disinfection link of a water treatment plant, organic matters in water react with a disinfectant to generate a large amount of disinfection byproducts, and the disinfection byproducts have carcinogenic, teratogenic and mutagenic effects on human bodies. Therefore, control studies of the disinfection by-products are particularly important. Trihalomethanes (THMs) have received much attention as the earliest carbon-containing disinfection agents to be discovered, and subsequently carbon-containing disinfection by-products such as haloacetic acids (HAAs), Chloral (CH), and the like have been discovered in succession. In recent years, with the increasing detection technology, various nitrogen-containing disinfection byproducts such as Halogenated Acetonitrile (HANs) and halogenated nitromethane are identified in sequence. The nitrogenous disinfection by-products have higher genotoxicity and cytotoxicity than the carbonaceous disinfection by-products. At present, in China, clear regulations are made on the maximum limit values of Trichloromethane (TCM), dichloroacetic acid (DCAA), trichloroacetic acid (TCAA) and CH in the sanitary standard of drinking water (GB5749-2006), which are respectively 60 mug/L, 50 mug/L, 100 mug/L and 10 mug/L. Among them, TCM, DCAA, and CH are at a high risk and need to pay attention.
Currently, the strategy for controlling disinfection byproducts can be summarized in three areas: source control, process control, and end control. Wherein, the source control means removing the precursor in the water before the disinfection, thereby reducing the generation amount of the disinfection by-product, and the method can control the generation of the disinfection by-product from the source, and is an effective disinfection by-product control method.
The composition of organic matters in surface water is very complex, a large amount of natural organic matters represented by humic acid, microbial metabolites generated during microbial activities and a large amount of protein substances exist, and a large amount of documents show that the natural organic matters are important precursors of disinfection byproducts. Therefore, if surface water is directly disinfected, various organic substances present in the water react with the disinfectant to generate a large amount of disinfection byproducts, and thus it is necessary to remove the organic substances from the water as much as possible before disinfection. To remove these organics, it is often necessary to use a number of different treatment processes. Coagulation-precipitation-sand filtration is a conventional water treatment process, coagulation refers to a process of reducing organic matters in water by adding a certain chemical agent (such as polyaluminium chloride (PACl)) to gather colloids and suspended matters in water, and the coagulation-precipitation process is widely applied to the water treatment process. The single coagulation sedimentation has low removal efficiency on the soluble organic matters, if the adding amount of the coagulant is continuously increased, the water body can be muddy, and the risk that the content of aluminum in the effluent exceeds the standard can be increased, so that the adding amount of the coagulant is increased once, and the soluble organic matters in the water can not be removed better. The sand filtration is to remove particulate matters and suspended matters in water by utilizing filter media such as quartz sand or manganese sand, but the removal effect of the sand filtration process on soluble organic matters is poor, and the sand filtration effluent can not intercept microorganisms and other fine particles in the water. Therefore, the conventional process can remove part of the disinfection by-product precursor, but it has low removal efficiency of the soluble organic substances, which are proved to be the main disinfection by-product precursor. Therefore, some treatment processes are often added on the basis of the conventional process, and different processes are combined to complement the removal characteristics of the organic matters by using different processes, so that the removal efficiency of the organic matters by the whole process is greatly improved, and the generation amount of the disinfection byproducts in the subsequent disinfection process is reduced.
How to simply and effectively control the generation of drinking water disinfection byproducts still needs to be further explored.
Disclosure of Invention
The invention aims to provide a method for removing disinfection by-product precursors through potassium permanganate pre-oxidation, coagulating sedimentation and ceramic membrane filtration, so as to reduce the generation amount of disinfection by-products.
Specifically, the technical scheme of the invention is as follows: a method for surface water control of potable water disinfection byproducts, said method comprising the steps of:
(1) taking surface water, adding potassium permanganate into the water twice, stirring for 5-6 min at the speed of 250-300 r/min after adding the potassium permanganate for the first time, and stirring for 10-12 min at the speed of 100-150 r/min after adding the potassium permanganate for the second time;
(2) adding polyaluminum chloride (PACl) into the water obtained in the step (1) after the pre-oxidation of the potassium permanganate, stirring for 5-6 min at the speed of 150-200 r/min after the PACl is added for the first time, and stirring for 10-12 min at the speed of 50-100 r/min after the PACl is added for the second time;
(3) standing and precipitating the coagulated water body obtained in the step (2), separating the supernatant from the precipitate, and filtering the supernatant by a ceramic membrane to obtain ceramic membrane effluent, wherein the ceramic membrane is one of the ceramic membranes with the aperture of 1.0 mu m, 0.1 mu m or 0.05 mu m;
(4) and (4) performing chlorine disinfection on the ceramic membrane effluent obtained in the step (3), and adding an excessive terminator to terminate the chlorine disinfection reaction after disinfection.
In one embodiment of the invention, the surface water is surface water that meets the three types of water quality standards.
In one embodiment of the invention, the total adding amount of the potassium permanganate is 0.1-0.5 mg/L, the adding amounts of the two times are 0.05-0.25 mg/L and 0.05-0.25 mg/L respectively, and preferably, the adding amounts of the two times are the same.
In one embodiment of the invention, the total dosage of the PACl is 20-40 mg/L, the total dosage of the PACl twice before and after the PACl is 10-20 mg/L and 10-20 mg/L respectively, and preferably, the total dosage of the PACl twice before and after the PACl is the same.
In one embodiment of the present invention, the precipitation time is 30 to 60 min.
In one embodiment of the invention, the ceramic membrane is one of ceramic membranes having a pore size of 0.05 μm, 0.10 μm or 1 μm.
In one embodiment of the invention, the chlorine disinfectant is sodium hypochlorite, and the disinfection conditions are that the chlorine adding amount is 30mg/L (effective free chlorine), the temperature is 25 +/-0.5 ℃, the pH value is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place.
In one embodiment of the invention, the terminating agent is ascorbic acid.
A second object of the invention is to apply the above process in the field of environmental protection.
The invention has the beneficial effects that:
(1) the chemical reagents used in the invention are common water treatment reagents, have no toxic and harmful substances, and have high safety.
(2) The method is simple to operate, low in cost and easy to popularize.
(3) According to the invention, potassium permanganate is adopted for pre-oxidation, and manganese dioxide generated in the pre-oxidation process can be utilized to improve the removal efficiency of macromolecular organic matters in the coagulation process, so that excessive addition of a coagulant PACl can be avoided, and the excessive standard exceeding of aluminum in effluent can be prevented.
(4) The ceramic membrane has smaller membrane aperture, and can intercept organic matters with smaller molecular weight compared with sand filtration.
(5) Macromolecular organic matters in water can be efficiently removed by utilizing the pre-oxidation and the coagulating sedimentation of the potassium permanganate, and the micromolecular organic matters in the water can be intercepted by filtering through a ceramic membrane. The difference of the removal characteristics of the organic matters in the water by different processes is large, the advantages of the organic matters can be combined by combining the processes, the soluble organic matters in the water can be efficiently removed, and the generation amount of disinfection byproducts in the disinfection process is reduced.
(6) The adding mode of adding potassium permanganate and PACl twice is adopted, so that the pre-oxidation effect and the coagulation efficiency of the water body are improved. Compared with the traditional method of adding potassium permanganate and PACl once, the adding method can better remove the disinfection by-product precursor, thereby better controlling the generation of the disinfection by-product.
Detailed Description
Measuring DOC with TOC-VCPH (TOC-VCPH, Shimadzu corporation); the concentration of soluble total nitrogen (DTN) was measured using a fully automatic continuous flow Analyzer (Auto Analyzer 3, SEAL, germany); spectrophotometry with Nyquist reagent for NH4 +-N is measured; by UV spectrophotometry of NO3 --N is measured; spectrophotometry of N- (1-naphthyl) -ethylenediamine for NO2 --N is measured; DON is represented by the formula: DON ═ TN-NH4 +-N－NO3 --N－NO2 --N is calculated; UV-light using UV-spectrophotometer254And (4) carrying out measurement. The residual chlorine is measured by adopting an N, N-diethyl-p-phenylenediamine spectrophotometry.
Determination of TCM and CH disinfection byproducts: adding 20mL of the sterilized water sample into a 50mL sample bottle; 4mL of methyl tert-butyl ether (MTBE) was added, and 6g of anhydrous Na dried at high temperature was immediately added2SO4(ii) a Oscillating on a vortex oscillator for 2min to fully extract; standing for 30min to separate the upper organic phase from the lower aqueous phase; sucking 1mL of the upper organic phase, and charging in gasThe phase vial was subjected to measurement by gas chromatography (GC-ECD).
Determination of DCAA disinfection byproducts: adding 20mL of the sterilized water sample into a 50mL sample bottle; adding 1mL of concentrated sulfuric acid into a water sample; 6g of anhydrous Na dried at high temperature was added2SO4Oscillating for 1min on a vortex oscillator; adding 4mL of MTBE, and extracting for 2min on a vortex oscillator to fully extract; standing for 30min to separate the upper organic phase from the lower aqueous phase; sucking 2mL of organic phase into a 10mL sample bottle, adding 2mL of acidified methanol (containing 10% sulfuric acid), and uniformly mixing; placing the mixture in a water bath kettle at 50 ℃ for reaction for 2 hours; taking out, cooling, adding 5mL of Na2SO4Shaking the solution (150g/L), standing and layering; sucking the lower layer aqueous solution until the lower layer aqueous solution is not more than 0.5 mL; 1mL of fresh saturated NaHCO was added3Uniformly mixing the solution, opening a bottle cap to release gas, and standing for 5 min; the upper organic phase (1 mL) was aspirated, and the resulting solution was placed in a gas vial and measured by a gas chromatograph (GC-ECD).
Example 1:
taking 1000mL of surface water (the basic physicochemical properties are shown in Table 1), firstly adding 0.05mg/L potassium permanganate into the water, stirring at the speed of 300r/min for 5min, then adding 0.05mg/L potassium permanganate into the water, and stirring at the speed of 150r/min for 10 min; adding 10mg/L PACl into the pre-oxidized water, stirring for 5min at the speed of 200r/min, then adding 10mg/L PACl, and stirring for 10min at the speed of 100 r/min; standing and precipitating for 30 min; taking the supernatant, and filtering with ceramic membrane (ceramic membrane pore diameter 0.1 μm); performing chlorine disinfection on the ceramic membrane effluent (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
TABLE 1 basic physicochemical Properties of surface Water
Example 2:
referring to example 1, the amount of potassium permanganate co-fed twice is replaced by 0.2mg/L, and other conditions are unchanged, specifically:
taking 1000mL of surface water, firstly adding 0.1mg/L potassium permanganate into the water, stirring for 5min at the speed of 300r/min, then adding 0.1mg/L potassium permanganate into the water, and stirring for 10min at the speed of 150 r/min; adding 10mg/L PACl into the pre-oxidized water, stirring for 5min at the speed of 200r/min, then adding 10mg/L PACl, and stirring for 10min at the speed of 100 r/min; standing and precipitating for 30 min; taking the supernatant, and filtering with ceramic membrane (ceramic membrane pore diameter 0.1 μm); performing chlorine disinfection on the ceramic membrane effluent (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
Example 3:
referring to example 1, the amount of potassium permanganate co-fed twice is replaced by 0.5mg/L, and other conditions are unchanged, specifically:
taking 1000mL of surface water, firstly adding 0.25mg/L potassium permanganate into the water, stirring for 5min at the speed of 300r/min, then adding 0.25mg/L potassium permanganate into the water, and stirring for 10min at the speed of 150 r/min; adding 10mg/L PACl into the pre-oxidized water, stirring for 5min at the speed of 200r/min, then adding 10mg/L PACl, and stirring for 10min at the speed of 100 r/min; standing and precipitating for 30 min; taking the supernatant, and filtering with ceramic membrane (ceramic membrane pore diameter 0.1 μm); performing chlorine disinfection on the ceramic membrane effluent (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
Example 4:
referring to example 3, the ceramic membrane with 0.1 μm pore size was replaced with a ceramic membrane with 1 μm pore size, and other conditions were unchanged, specifically:
taking 1000mL of surface water, firstly adding 0.25mg/L potassium permanganate into the water, stirring for 5min at the speed of 300r/min, then adding 0.25mg/L potassium permanganate into the water, and stirring for 10min at the speed of 150 r/min; adding 10mg/L PACl into the pre-oxidized water, stirring for 5min at the speed of 200r/min, then adding 10mg/L PACl, and stirring for 10min at the speed of 100 r/min; standing and precipitating for 30 min; taking the supernatant, and filtering with ceramic membrane (the aperture of the ceramic membrane is 1 μm); performing chlorine disinfection on the ceramic membrane effluent (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
Example 5:
referring to example 3, the ceramic membrane with 0.1 μm pore size was replaced with a ceramic membrane with 0.05 μm pore size, and the following specific conditions were used:
taking 1000mL of surface water, firstly adding 0.25mg/L potassium permanganate into the water, stirring for 5min at the speed of 300r/min, then adding 0.25mg/L potassium permanganate into the water, and stirring for 10min at the speed of 150 r/min; adding 10mg/L PACl into the pre-oxidized water, stirring for 5min at the speed of 200r/min, then adding 10mg/L PACl, and stirring for 10min at the speed of 100 r/min; standing and precipitating for 30 min; taking the supernatant, and filtering with ceramic membrane (ceramic membrane pore size 0.05 μm); performing chlorine disinfection on the ceramic membrane effluent (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
Comparative example 1:
referring to example 1, potassium permanganate pre-oxidation and ceramic membrane filtration were omitted, and other conditions were unchanged, specifically:
taking 1000mL of surface water, adding 10mg/L of PACl into the surface water, stirring for 5min at the speed of 200r/min, then adding 10mg/L of PACl, and stirring for 10min at the speed of 100 r/min; standing and precipitating for 30 min; taking the supernatant to carry out chlorine disinfection (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
Comparative example 2:
referring to example 3, the potassium permanganate is added in an amount of 0.5mg/L by one-time addition, and the mixture is stirred at a speed of 300r/min for 15min, wherein other conditions are unchanged, and specifically the method comprises the following steps:
taking 1000mL of surface water, adding 0.5mg/L potassium permanganate into the water, and stirring at the speed of 300r/min for 15 min; adding 10mg/L PACl into the pre-oxidized water, stirring for 5min at the speed of 200r/min, then adding 10mg/L PACl, and stirring for 10min at the speed of 100 r/min; standing and precipitating for 30 min; taking the supernatant, and filtering with ceramic membrane (ceramic membrane pore diameter 0.1 μm); performing chlorine disinfection on the ceramic membrane effluent (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
Comparative example 3:
referring to example 3, 20mg/L PACl is added in a one-time adding manner, and the mixture is stirred at the speed of 200r/min for 10min, wherein other conditions are unchanged, and the method specifically comprises the following steps:
taking 1000mL of surface water, firstly adding 0.25mg/L potassium permanganate into the water, stirring for 5min at the speed of 300r/min, then adding 0.25mg/L potassium permanganate into the water, and stirring for 10min at the speed of 150 r/min; adding 20mg/L PACl into the pre-oxidized water, and stirring at the speed of 200r/min for 10 min; standing and precipitating for 30 min; taking the supernatant, and filtering with ceramic membrane (ceramic membrane pore diameter 0.1 μm); performing chlorine disinfection on the ceramic membrane effluent (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
Comparative example 4:
referring to example 3, potassium permanganate pre-oxidation and ceramic membrane filtration were omitted, and the amount of PACl added was increased to 30mg/L, with a single addition, and other conditions unchanged, specifically:
taking 1000mL of surface water, adding 30mg/L PACl into the surface water, and stirring at the speed of 200r/min for 10 min; standing and precipitating for 30 min; taking the supernatant to carry out chlorine disinfection (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
Comparative example 5:
referring to example 3, potassium permanganate pre-oxidation and ceramic membrane filtration were omitted, and the amount of PACl added was increased to 40mg/L, with a single addition, and other conditions unchanged, specifically:
taking 1000mL of surface water, adding 40mg/L PACl into the surface water, and stirring at the speed of 200r/min for 10 min; standing and precipitating for 30 min; taking the supernatant to carry out chlorine disinfection (the chlorine adding amount is 30mg/L, the temperature is 25 +/-0.5 ℃, the pH is 7.0 +/-0.1, and the reaction is carried out for 24 hours in a dark place); after 24h of sterilization, the chlorine sterilization reaction was terminated by adding an excess amount of ascorbic acid, and the concentration of the sterilization by-products in water was measured, and the results are shown in Table 2.
TABLE 2 production amounts of 3 kinds of disinfection by-products in examples 1 to 5 and comparative examples 1 to 5
In combination with the embodiments 1-5, it can be seen that the generation amounts of TCM, DCAA and CH meet the requirements of sanitary standards for drinking water (GB5749-2006) after the effluent water subjected to the potassium permanganate fractional pre-oxidation, fractional coagulating sedimentation and ceramic membrane filtration treatment is subjected to chlorine disinfection.
As can be seen from examples 1 to 3: the adding amount of the potassium permanganate is increased, the pre-oxidation effect of the water body can be improved, and the disinfection by-products of the potassium permanganate-coagulating sedimentation-ceramic membrane filtered water are reduced.
As can be seen from example 3, comparative example 2 and comparative example 3, the addition of potassium permanganate and PACl has a great influence on the generation of disinfection byproducts. Under the condition of the same total adding amount, the potassium permanganate and the PACl are added twice, which is beneficial to the control of the disinfection by-products.
As can be seen from examples 3, 4 and 5, the smaller the pore size of the ceramic membrane, the more favorable the control of the disinfection by-products. Wherein, when a ceramic membrane with the aperture of 0.05 mu m is adopted, the generation amounts of TCM, DCAA and CH of water filtered by the potassium permanganate-coagulating sedimentation-ceramic membrane are the lowest.
From comparative example 1, it can be seen that: the effluent which is not subjected to potassium permanganate pre-oxidation and ceramic membrane filtration but only subjected to coagulating sedimentation exceeds the standard, and the generation amounts of TCM, DCAA and CH exceed the standard. From comparative example 1, comparative example 4 and comparative example 5, it can be seen that: without potassium permanganate pre-oxidation and ceramic membrane filtration, only increasing the amount of PACl added has limited control of the disinfection by-products. When the PACl adding amount is increased to 50mg/L, the concentrations of effluent TCM, DCAA and CH can not completely meet the requirements of GB 5749-2006.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A method for surface water control of potable water disinfection byproducts, the method comprising the steps of:
(1) taking surface water, adding potassium permanganate into the water twice, stirring for 5-6 min at the speed of 250-300 r/min after adding the potassium permanganate for the first time, and stirring for 10-12 min at the speed of 100-150 r/min after adding the potassium permanganate for the second time;
(2) adding polyaluminum chloride into the water obtained in the step (1) after the pre-oxidation of the potassium permanganate, stirring for 5-6 min at the speed of 150-200 r/min after the polyaluminum chloride is added for the first time, and stirring for 10-12 min at the speed of 50-100 r/min after the polyaluminum chloride is added for the second time;
(3) standing and precipitating the coagulated water body obtained in the step (2), separating the supernatant from the precipitate, and filtering the supernatant by a ceramic membrane to obtain ceramic membrane effluent, wherein the ceramic membrane is one of the ceramic membranes with the aperture of 1.0 mu m, 0.1 mu m or 0.05 mu m;
(4) performing chlorine disinfection on the ceramic membrane effluent obtained in the step (3), and adding excessive terminating agent to terminate the chlorine disinfection reaction after disinfection;
wherein the total adding amount of the potassium permanganate is 0.1-0.5 mg/L, and the adding amounts of the potassium permanganate twice before and after twice are 0.05-0.25 mg/L and 0.05-0.25 mg/L respectively; the adding amount of the polyaluminium chloride is 20-40 mg/L in total, and the adding amount of the polyaluminium chloride twice is 10-20 mg/L and 10-20 mg/L respectively.
2. The method according to claim 1, wherein the settling time is 30-60 min.
3. The method for controlling the disinfection by-products of drinking water for surface water as claimed in claim 1 or 2, wherein the chlorine disinfectant is sodium hypochlorite, the disinfection conditions are that the chlorine adding amount is 30mg/L, the temperature is 25 ± 0.5 ℃, the pH is 7.0 ± 0.1, and the reaction is carried out for 24 hours in a dark place.
4. A method for surface water control of drinking water disinfection byproducts as claimed in claim 1 or 2, wherein said terminating agent is ascorbic acid.
5. A method for surface water control of drinking water disinfection byproducts as claimed in claim 3, wherein said terminating agent is ascorbic acid.
6. Use of a method according to any one of claims 1 to 5 for controlling disinfection by-products of drinking water in surface water in the field of water treatment.
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