CN1261370C - Oxidation coagulation aiding method using ozone and potassium permanganate - Google Patents
Oxidation coagulation aiding method using ozone and potassium permanganate Download PDFInfo
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- CN1261370C CN1261370C CN 200410013515 CN200410013515A CN1261370C CN 1261370 C CN1261370 C CN 1261370C CN 200410013515 CN200410013515 CN 200410013515 CN 200410013515 A CN200410013515 A CN 200410013515A CN 1261370 C CN1261370 C CN 1261370C
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Abstract
The present invention relates to a water supply treatment method, particularly to an oxidation coagulation aiding method by ozone and potassium permanganate. In the oxidation coagulation aiding method by ozone and potassium permanganate, two oxidizing agents of the ozone and the potassium permanganate are added into raw water, the added amount of the ozone is from 0.1 to 3 mg/l, and the added amount of the potassium permanganate is from 0.1 to 1.5 mg/l. In the oxidation coagulation aiding method by ozone and potassium permanganate, the potassium permanganate and one medicine or the mixture of several kinds of medicines comprising polymerization aluminum, aluminum sulfate, aluminum trichloride, ferric chloride, polymerization aluminum sulfate, polymerization aluminum chloride, kaolin clay, diatomite and the like can be also used as the oxidizing agents to replace the single potassium permanganate. The potassium permanganate added in the oxidation coagulation aiding method by ozone and potassium permanganate can intensify and catalyze the oxidation of the ozone, and the potassium permanganate can also enhance removing effect on micro pollutants in the water. The removing rate of the pollutants including algae, organic substances, nitrogen types, disinfection by-product antecedents and the like can be respectively enhanced by more than 10%.
Description
Technical field: the present invention relates to a kind of feedwater treatment method.
Background technology: owing to be subjected to the influence of factors such as sewage discharge and agricultural run-off, risk of drinking water pollution constantly increases the weight of, body eutrophication, and algal bloom, existing conventional handling technology of water supply is difficult to ensure drinking-water quality.Prechlorination is the normal method for pre-oxidizing that adopts, and can strengthen the removal of algae, yet organism effect meeting produces harmful chlorinated secondary product in the chlorine of high density and the water.Though the chlorine residue in the pipe network can limit the bacterial growth in the pipe network to a certain extent, but when the organotrophy substrate concn is higher, bacterium still can breed once again, and apposition growth forms microbial film on tube wall, increase total plate count in the water, moreover some bacterium hazardness is bigger, influences the microbial safety of tap water to a certain extent.The The actual running results of water factory has also proved and has had these problems.Replacing prechlorination with pre-ozonation is applied in the water factory by developed country.Ozone pre-oxidation can be used for decolouring, deodorizing, control cholorination by product, strengthens removal algae and algae toxin, helps with fixed attention and help filter etc.Lot of documents shows, also not really clear to the mechanism of action of ozone pre-oxidation both at home and abroad at present, the someone thinks that ozone pre-oxidation can improve coagulation effect, helps the effect of coagulating even coagulation is had side effect and there is the people to think that ozone pre-oxidation does not play.The effect of pre-ozonation is influenced by several factors, as former water organic concentration, hardness, ozone dosage, preoxidation and coagulation condition etc.Ozone dosage is the principal element that influences the preoxidation effect, it is reported, when ozone dosage was low, the preoxidation effect of flocculant was remarkable, but ozone dosage is too high, makes organism polarity increase in the water, can side effect be arranged to coagulation.In addition, the ozonize meeting increases the biodegradability of water, increase the content of organotrophy matrix in the water, the biology that is embodied in water can assimilate organic carbon (AOC) and the rising of biodegradable dissolved organic carbon (BDOC) concentration, and influence degree is also relevant with raw water quality, ozonize condition.
Summary of the invention: the present invention is exactly in order to remedy the shortcoming of the independent oxidation of ozone, improve treatment effect, thereby ensure the water quality safety of tap water, method of the present invention is to add ozone and two kinds of oxygenants of potassium permanganate in former water, the ozone dosage is 0.1～3mg/l, the dosage of potassium permanganate is 0.1～1.5mg/l, two kinds of oxygenants add the time difference within 5 minutes, can also replace single potassium permanganate as oxygenant with the mixture of potassium permanganate and following any one or a few medicament: Tai-Ace S 150, aluminum chloride, iron trichloride, polyaluminium sulfate, polymerize aluminum chloride, polymerization iron, activated silicic acid, ferric-polysilicate, aluminium silicate polymer, zeolite, magnesium oxide, calcium oxide, calcium hydroxide, Powdered Activated Carbon, calcium chloride, potassium ferrate, ferric sulfate, Losantin, clorox, ferrous sulfate, sodium hydroxide, potassium hydroxide, sodium bicarbonate, polyacrylamide, wilkinite, kaolin, diatomite.The present invention added an amount of permanganate before or after pre-ozone (permanganate among the present invention refers to the mixture of independent potassium permanganate or potassium permanganate and following any one or a few medicament: polymeric aluminum, Tai-Ace S 150, aluminum chloride, iron trichloride, polyaluminium sulfate, polymerize aluminum chloride, polymerization iron, activated silicic acid, ferric-polysilicate, aluminium silicate polymer, zeolite, magnesium oxide, calcium oxide, calcium hydroxide, Powdered Activated Carbon, calcium chloride, potassium ferrate, ferric sulfate, Losantin, clorox, ferrous sulfate, sodium hydroxide, potassium hydroxide, sodium bicarbonate, polyacrylamide, the nonionic organic polymer, anionic organic polymer, cationic organic high-molecular, wilkinite, kaolin, diatomite), utilize permanganate to strengthen or O3 catalytic oxidation, raising is to the removal effect of Micropollutants in the water, and the effect of coagulating that helps of permanganate itself simultaneously also can improve coagulation effect.The invention has the advantages that: ozone and potassium permanganate or contain the compound associating preoxidation of potassium permanganate, produce synergistic oxidation and catalysed oxidn between the two, thereby improve the oxidation capacity of ozone, reinforcement to algae removal in the removal of smelling flavor in the removals of Micropollutants in the water, the water, the fortified water, improve effect of flocculant, both couplings can reduce or avoid to add merely the side effect of ozone generation, improve comprehensive depollution efficient, ensure drinking-water quality safety.The manganese of the intermediate state that permanganate forms in reaction process and the Mn oxide of nascent state have katalysis to ozone oxidation, can strengthen the depollution effect of ozone.The present invention compares with independent ozonize, all can improve more than 10% respectively the clearance of pollutents such as algae, organism, nitrogen class, disinfection byproduct (DBP) antecedent.With ozone and the compound preoxidation enhanced coagulation of permanganate, follow-up dosing coagulant carries out coagulation, and various dissimilar coagulating agent all have and significantly help the effect of coagulating.Adding of permanganate do not need to increase a lot of structures and equipment, all is simple to the transformation of newly-built water factory and existing water factory.The present invention can save the dosage of coagulating agent and ozone, not only can reduce water producing cost, and can avoid because the excessive side effect that adds generation of ozone, economically with technical all be feasible, have good application value.
Embodiment one: carried out the lab scale research of laboratory stage at the present invention: test adopts six agitators to study, and the ozone dosage is at 0.1～3mg/l, and the potassium permanganate dosage is at 0.1～1.5mg/l.Dosage ratio between the two is by a large amount of verification experimental verification gained, and two kinds of oxygenants are added in the former water simultaneously in the present embodiment.Test-results shows, the coupling between two kinds of oxygenants can reach good treatment effect, can improve 10～20% to organic clearance, and turbidity can be reduced to about 1NTU.
Embodiment two: the difference of present embodiment and embodiment one is, potassium permanganate adds during after adding ozone 5 minutes, and other is identical with embodiment one.
Embodiment three: the difference of present embodiment and embodiment one is, ozone 3 minutes after adding potassium permanganate add, and other is identical with embodiment one.
Embodiment four: present embodiment is according to the industrial experimentation result of study.A kind of oxygenant be the mixture of potassium permanganate and following any one or a few medicament as oxygenant: polymeric aluminum, Tai-Ace S 150, aluminum chloride, iron trichloride, polyaluminium sulfate, polymerize aluminum chloride, polymerization iron, activated silicic acid, ferric-polysilicate, aluminium silicate polymer, zeolite, magnesium oxide, calcium oxide, calcium hydroxide, Powdered Activated Carbon, calcium chloride, potassium ferrate, ferric sulfate, Losantin, clorox, ferrous sulfate, sodium hydroxide, potassium hydroxide, sodium bicarbonate, polyacrylamide, the nonionic organic polymer, anionic organic polymer, cationic organic high-molecular, wilkinite, kaolin, diatomite, permanganate are selected to add after the ozone oxidation.Promptly add aforementioned oxygenant again through the water outlet after the ozone oxidation and strengthen oxidation and synergistic oxidation, oxidization time is 1min, then the dosing coagulant polymerize aluminum chloride.
Removal result to turbidity shows that along with the increase of permanganate throwing amount, settled water turbidity also reduces gradually.When the permanganate dosage reached 0.6mg/l, removal effect was best, and delivery turbidity remains on about 1.0NTU.Ozone dosage is when 0.8～1.0mg/l, and delivery turbidity is minimum.After 1.0mg/l, increase the amount of ozone again, but along with the increase water outlet effect of throwing amount variation gradually.
Organic removal result is shown after preoxidation and the heavy back water stage, their treatment effect is more or less the same, but after filter the water stage, adding of permanganate can improve about 10% with organic clearance.The variation of ozone dosage does not make COD
MnRemoval have regular variation, be the clearance that when 0.5mg/L, reaches best on the contrary, can reach 50%.
Observed result to algae shows that for the different treatment situation, in the preoxidation stage, along with the increase of permanganate dosage, clearance also raises gradually, can be elevated to about 50% of both couplings by 20% of simple pre-ozone.Different the treatment stage, also can improve about 10% afterwards.
In the preoxidation water outlet stage, all show the trend that ammonia nitrogen increases under the different treatment situation, and the trend that separately pre-ozone increases is comparatively obvious, has arrived the heavy back water stage, pre-ozone still continues to increase, and it is on a declining curve to add the situation ammonia nitrogen of permanganate.To the filter latter stage, all significantly decrease, clearance can reach 20～30%.This shows that adding of permanganate can improve ammonia-N removal rate, and ozonize can not reach this effect separately.
After the preoxidation, the clearance of nitrite is very high, and separately pre-ozone can reach the clearance about 50%, and after adding permanganate, clearance all raises to some extent, can further improve 10～20% respectively.
Production run and experimental result all draw following Main Conclusions: the uniting use and can improve treating water water quality at different aspect of permanganate preoxidation and ozone, the different treatment index can improve respectively more than 10%; Under certain ozone dosage condition, higher permanganate dosage can reach treatment effect preferably; The permanganate dosage is constant, changes the throwing amount of ozone, and the result is not along with the ozone dosage is high more, and result is good more, is that lower ozone dosage is better on the contrary; Adding under the situation of permanganate, can reach treatment effect preferably when the ozone dosage is controlled at 0.5～1.0mg/l, and the dosage of permanganate can change in 0.2～0.6mg/l scope; Permanganate add the dosage that can save coagulating agent and ozone, thereby saved water producing cost, take all factors into consideration, add permanganate and can save 1 minute/cube water of cost at least.
Claims (6)
1, the Aid for Oxidation that ozone and potassium permanganate coupling handle is carried out in the drinking water source and coagulate method, it is characterized in that in former water, adding ozone and two kinds of oxygenants of potassium permanganate, the ozone dosage is 0.1～3mg/l, the dosage of potassium permanganate is 0.1～1.5mg/l, two kinds of oxygenants add the time difference within 5 minutes.
2, according to claim 1ly the Aid for Oxidation that ozone and potassium permanganate coupling handle is carried out in the drinking water source coagulate method, it is characterized in that the ozone dosage is 0.5～1.0mg/l, the dosage of potassium permanganate is 0.2～0.6mg/l.
3, according to claim 1ly the Aid for Oxidation that ozone and potassium permanganate coupling handle is carried out in the drinking water source coagulate method, it is characterized in that replacing single potassium permanganate as oxygenant: Tai-Ace S 150 with the mixture of potassium permanganate and following any one or a few medicament, aluminum chloride, iron trichloride, polyaluminium sulfate, polymerize aluminum chloride, polymerization iron, activated silicic acid, ferric-polysilicate, aluminium silicate polymer, zeolite, magnesium oxide, calcium oxide, calcium hydroxide, Powdered Activated Carbon, calcium chloride, potassium ferrate, ferric sulfate, Losantin, clorox, ferrous sulfate, sodium hydroxide, potassium hydroxide, sodium bicarbonate, polyacrylamide, wilkinite, kaolin, diatomite.
4, describedly the Aid for Oxidation that ozone and potassium permanganate coupling handle is carried out in the drinking water source coagulate method according to claim 1,2 or 3, it is characterized in that adding earlier ozone, add another kind of oxygenant then.
5, according to claim 3ly the Aid for Oxidation that ozone and potassium permanganate coupling handle is carried out in the drinking water source coagulate method, it is characterized in that adding earlier the oxygenant of the mixture of potassium permanganate or potassium permanganate and medicament, add ozone then.
6, describedly the Aid for Oxidation that ozone and potassium permanganate coupling handle is carried out in the drinking water source coagulate method according to claim 1,2 or 3, it is characterized in that two kinds of oxygenants add simultaneously.
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