CN103739036A - Oil-containing sewage treatment method - Google Patents
Oil-containing sewage treatment method Download PDFInfo
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- CN103739036A CN103739036A CN201310565057.1A CN201310565057A CN103739036A CN 103739036 A CN103739036 A CN 103739036A CN 201310565057 A CN201310565057 A CN 201310565057A CN 103739036 A CN103739036 A CN 103739036A
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Abstract
The present invention discloses an oil-containing sewage treatment method, which comprises: 1) carrying out primary filtration, wherein oil-containing sewage is subjected to primary filtration through a filtration screen, the filtration residue is discharged into a garbage can, and the filtered oil-containing sewage is discharged into a sewage treatment device; 2) adding a sewage treatment agent to the sewage treatment device, and adding a pH value adjustment agent to adjust the pH value of the sewage to 6.5-7.5, wherein the sewage treatment agent comprises polymeric ferric sulfate, sodium humate and polyacrylamide, and the amounts of polymeric ferric sulfate, sodium humate and polyacrylamide are respectively 0.6-1.2 mg/L ,1.0-1.6 mg/L and 40-50 mg/L; and 3) carrying out a reaction for 2-4 h after adding the sewage treatment agent, sucking the oil layer on the upper surface of the sewage treatment device, and discharging the sewage on the lower layer. According to the present invention, grease in the oil-containing sewage can be well removed.
Description
Technical field
The present invention relates to a kind for the treatment of process of oily(waste)water.
Background technology
Catering trade oily(waste)water refers to the sewage of catering industry sewer line that enters in operation process, be characterized in higher containing grease, particularly Chinese dietary structure makes grease and total suspended particles content in sewage high especially, wherein fat content is in 7600mg/L left and right, and total suspended particles is in 5000mg/L left and right.This kind of waste water has two harm greatly, first: a large amount of greases and residue very easily stick on sewer line wall, accumulate over a long period and make pipeline actual circulation area more and more less, finally form and stop up, the loss that cause because of line clogging in city, annual Ganzhou according to estimates will be in millions of.Second: a large amount of greases finally enters sewage work by pipe network, make to the very responsive biological bacteria of grease degenerate in a large number, death, cause effluent quality obviously to decline and discharge water body polluted.
In recent years; along with the growth of national economy; catering industry develops rapidly; the wastewater flow rate of its discharge is increasing; due to the vegetable and animals oils that contains higher concentration in this waste water and a large amount of suspended solid, make it to become an important water pollution source, the improvement of catering trade oily(waste)water can not only be preserved the ecological environment; and can alleviate the burden at municipal sewage treatment station, there is obvious environmental benefit and economic benefit.In catering trade oily(waste)water, containing filth amount is very high, principal pollutant are vegetable and animals oils, chemical oxygen demand and suspended substance etc., at present, in catering trade, the application of washing composition makes oil be emulsification shape to float in water, thereby greatly increased the value of chemical oxygen demand in water, generally all reach several thousand mg/L, secondly, because oil is less with the proportion of washing composition, they and waste water suspension are bonded together, make it not free settling, visible, vegetable and animals oils is key pollutants, the oil-contg reducing in catering trade oily(waste)water has direct impact to reducing chemical oxygen demand and suspended substance.The use of washing composition makes oil in catering trade oily(waste)water be emulsification shape, and general profit treatment facility is difficult to carry out oily water separation, oil in water emulsion must be carried out to breakdown of emulsion processing; Meanwhile, due to the vegetable and animals oils pasty state that is white in color at normal temperatures, easy blocking pipe when oily water separation, has also caused the difficulty of this waste water treatment.So from the viewpoint of environmental requirement, the effluent problem of catering trade is needed solution badly.
summary of the invention
Technical problem to be solved by this invention is to provide a kind for the treatment of process of oily(waste)water, and the method can be removed the grease in oily(waste)water preferably.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind for the treatment of process of oily(waste)water, comprise the steps: 1) initial filter: oily(waste)water is tentatively filtered by filter screen, filter residue enters rubbish container, and the oily(waste)water after filtration enters apparatus for treating sewage; 2) in apparatus for treating sewage, add sewage-treating agent, and add pH adjusting agent to regulate the pH value of sewage to 6.5-7.5, sewage-treating agent consists of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide, and the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide is respectively 0.6-1.2mg/L, 1.0-1.6 mg/L, 40-50 mg/L; 3) react 2-4h after adding sewage-treating agent, by the oil reservoir sucking-off of apparatus for treating sewage upper surface, lower floor's sewage is discharged.
Particularly, in described step 3), adopt oil suction pipe by the oil reservoir sucking-off of apparatus for treating sewage upper surface, in oil suction pipe, be provided with heating unit.
Described step 2) in regulate the pH value of sewage to 6.8-7.2.
Described step 2) the middle pH value to 6.9 that regulates sewage.
Described step 2) in the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide be respectively 0.9-1.1mg/L, 1.2-1.4 mg/L, 48-55 mg/L.
Described step 2) in the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide be respectively 1.0mg/L, 1.3 mg/L, 52 mg/L.
After adding sewage-treating agent in described step 3), react 3h.
The present invention compared with prior art has the following advantages and beneficial effect: the present invention utilizes the bodied ferric sulfate of cationic, reduce the surfactivity of anionic property washing composition, the hydration shell that destroys emulsion oil droplet with and double electrical layers, oil is separated out, recycling flocculation agent is separated oil droplet cohesion from water, and bodied ferric sulfate is acid simultaneously, makes the fatty acid soaps in emulsion be converted into water-fast lipid acid, reduce surfactant in water, increased demulsification.Then with Sodium salts humic acids, polyacrylamide, help solidifyingly, the oil after breakdown of emulsion is further condensed, utilize gravity principle to make oily water separation.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
The treatment process of a kind of oily(waste)water of the present invention, comprises the steps:
1) initial filter: oily(waste)water is tentatively filtered by filter screen, and filter residue enters rubbish container, the oily(waste)water after filtration enters apparatus for treating sewage;
2) in apparatus for treating sewage, add sewage-treating agent, and add pH adjusting agent to regulate the pH value of sewage to 6.5-7.5, sewage-treating agent consists of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide, and the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide is respectively 0.6-1.2mg/L, 1.0-1.6 mg/L, 40-50 mg/L;
3) react 2-4h after adding sewage-treating agent, adopt oil suction pipe by the oil reservoir sucking-off of apparatus for treating sewage upper surface, lower floor's sewage is discharged.For fear of the too low animal oil condensation blocking pipeline in oil suction pipe that causes of temperature, in oil suction pipe, be provided with heating unit, when temperature is too low, start heating unit, can guarantee that oil suction is unobstructed.
Described step 2) in the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide be respectively 0.9-1.1mg/L, 1.2-1.4 mg/L, 48-55 mg/L.
Described step 2) in the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide be respectively 1.0mg/L, 1.3 mg/L, 52 mg/L.
After adding sewage-treating agent in described step 3), react 3h.
For the character of oily wastewater in catering industry, first discuss how this waste water oil in water emulsion is carried out to breakdown of emulsion.It is obvious that bodied ferric sulfate, polyacrylamide mix result of use, the dregs of fat and water stratification are rapid, its cardinal principle is as follows: the bodied ferric sulfate that utilizes cationic, reduce the surfactivity of anionic property washing composition, the hydration shell that destroys emulsion oil droplet with and double electrical layers, oil is separated out, recycling flocculation agent is separated oil droplet cohesion from water, bodied ferric sulfate is acid simultaneously, make the fatty acid soaps in emulsion be converted into water-fast lipid acid, reduce surfactant in water, increased demulsification.Then with Sodium salts humic acids, polyacrylamide, help solidifyingly, the oil after breakdown of emulsion is further condensed, utilize gravity principle to make oily water separation.
In order to study the impact of acidifying on demulsification, determine optimal ph, under the constant prerequisite of sewage-treating agent consumption, the impact that relatively pH begins on waste water de-oiling, considers the requirement to discharge water pH value, the variation range of pH is 6.5-7.5.Test conditions is: the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide is respectively 1.0mg/L, 1.3 mg/L, 52 mg/L.Within the studied pH beginning, de-oiling effect is all fine, oil can be taken off below 15mg/L, and meanwhile, when pH beginning scope is 6.8-7.2, profit has point interval velocity faster.Meanwhile, experiment discovery, under different pH conditions, the percentage difference that bodied ferric sulfate hydrolysate is shared, thus the de-oiling effect producing is different.For this reason, control certain condition (consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide is respectively 1.0mg/L, 1.3 mg/L, 52 mg/L), situation to different pH compares, result shows, when pH treatment effect the best 6.9 time, this scope just meets emission request, so optimal ph is 6.9.
The impact of bodied ferric sulfate consumption
The pH value that control contains waste water is 6.9, the consumption of Sodium salts humic acids, polyacrylamide is respectively 1.3 mg/L, 52 mg/L, during to different amounts bodied ferric sulfate, the situation of breakdown of emulsion compares, bodied ferric sulfate consumption is when 0.6-1.2mg/L, deoiling effect is better, when bodied ferric sulfate consumption is during at 1.0mg/L, deoiling effect the best.
The impact of polyacrylamide consumption on breakdown of emulsion
The pH value that control contains waste water is 6.9, the consumption of bodied ferric sulfate, Sodium salts humic acids is respectively 1.0mg/L, 1.3 mg/L, investigates the impact of polyacrylamide consumption on breakdown of emulsion, and comparative result shows, polyacrylamide add-on on precipitated and separated impact greatly, along with the increase of polyacrylamide consumption, precipitated and separated speed increases, and coordinates other compositions to form, polyacrylamide consumption is when 40-55 mg/L, deoiling effect is better, polyacrylamide consumption when 52mg/L, deoiling effect the best.
The impact of Sodium salts humic acids consumption
Sodium salts humic acids is a kind of selective flocculant, there is very strong adsorptive power, in its structure, there are many active groups, consider that the degree of depth removes oil purification, find out that Sodium salts humic acids consumption is necessary on the impact of de-oiling, controlling the pH value that contains waste water is 6.9, and the consumption of bodied ferric sulfate, polyacrylamide is respectively 1.0mg/L, 52 mg/L, Sodium salts humic acids has positive effect to removing oil in waste water
The consumption of Sodium salts humic acids is when 1.2-1.4mg/L, and deoiling effect is better, oil can be taken off below 20mg/L, and the consumption of Sodium salts humic acids is when 1.3mg/L, and deoiling effect is better, oil can be taken off below 15.mg/ L.
To sum up, pH value is 6.9, the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide is respectively 1.0mg/L, 1.3 mg/L, 52 mg/L are best oily(waste)water treatment condition, under this condition, oil can be taken off below 15.mg/ L, effluent quality is Clear & Transparent, and breakdown of emulsion efficiency reaches 95%, and clear liquid residual volume is lower than national standard.
As mentioned above, can well realize the present invention.
Claims (7)
1. a treatment process for oily(waste)water, is characterized in that, comprises the steps:
1) initial filter: oily(waste)water is tentatively filtered by filter screen, and filter residue enters rubbish container, the oily(waste)water after filtration enters apparatus for treating sewage;
2) in apparatus for treating sewage, add sewage-treating agent, and add pH adjusting agent to regulate the pH value of sewage to 6.5-7.5, sewage-treating agent consists of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide, and the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide is respectively 0.6-1.2mg/L, 1.0-1.6 mg/L, 40-50 mg/L;
3) react 2-4h after adding sewage-treating agent, by the oil reservoir sucking-off of apparatus for treating sewage upper surface, lower floor's sewage is discharged.
2. the treatment process of a kind of oily(waste)water according to claim 1, is characterized in that, adopts oil suction pipe by the oil reservoir sucking-off of apparatus for treating sewage upper surface in described step 3), is provided with heating unit in oil suction pipe.
3. the treatment process of a kind of oily(waste)water according to claim 1, is characterized in that, described step 2) in regulate the pH value of sewage to 6.8-7.2.
4. the treatment process of a kind of oily(waste)water according to claim 3, is characterized in that, described step 2) the middle pH value to 6.9 that regulates sewage.
5. the treatment process of a kind of oily(waste)water according to claim 1, is characterized in that, described step 2) in the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide be respectively 0.9-1.1mg/L, 1.2-1.4 mg/L, 48-55 mg/L.
6. the treatment process of a kind of oily(waste)water according to claim 5, is characterized in that, described step 2) in the consumption of bodied ferric sulfate, Sodium salts humic acids, polyacrylamide be respectively 1.0mg/L, 1.3 mg/L, 52 mg/L.
7. the treatment process of a kind of oily(waste)water according to claim 1, is characterized in that, reacts 3h after adding sewage-treating agent in described step 3).
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| CN201310565057.1A CN103739036A (en) | 2013-11-14 | 2013-11-14 | Oil-containing sewage treatment method |
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Cited By (2)
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| CN105948402A (en) * | 2016-06-25 | 2016-09-21 | 张莘蔓 | Preparation method of oily sewage biofermentation treating agent |
| CN113181685A (en) * | 2021-04-29 | 2021-07-30 | 湖南联合餐厨垃圾处理有限公司 | Acidic high-salt kitchen waste slurry demulsifier and preparation method and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105948402A (en) * | 2016-06-25 | 2016-09-21 | 张莘蔓 | Preparation method of oily sewage biofermentation treating agent |
| CN113181685A (en) * | 2021-04-29 | 2021-07-30 | 湖南联合餐厨垃圾处理有限公司 | Acidic high-salt kitchen waste slurry demulsifier and preparation method and application thereof |
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Application publication date: 20140423 |