CN104230055A - Refinery wastewater treatment method - Google Patents
Refinery wastewater treatment method Download PDFInfo
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- CN104230055A CN104230055A CN201410480894.9A CN201410480894A CN104230055A CN 104230055 A CN104230055 A CN 104230055A CN 201410480894 A CN201410480894 A CN 201410480894A CN 104230055 A CN104230055 A CN 104230055A
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Abstract
The invention relates to a refinery wastewater treatment method, and belongs to the field of wastewater treatment methods. The refinery wastewater treatment method comprises the steps as follows: water quality and water quantity of refinery wastewater are balanced by a regulating tank; the regulated wastewater automatically flows into a combined oil separation tank for oil separation treatment; and the wastewater after oil separation treatment is pumped into a coagulation air floatation tank by a sewage pump for air floatation treatment, so that the wastewater can reach the standard for emission. According to the refinery wastewater treatment method, a technology of series connection of the combined oil separation tank, namely the horizontal flow type and inclined plate type integrated oil separation tank, and the two-stage coagulation air floatation tank is adopted to treat the oily wastewater, , oily and solid matters can be removed very well under the condition that the temperature, the pH value, the adding quantity of a coagulant, effective dissolved gas and the like are effectively controlled, and meanwhile, COD (chemical oxygen demand) is further removed very well; and besides, a biochemical treatment unit is omitted, so that the refinery wastewater treatment method has the advantages of low investment and operation expense and the like, the oil separation tank has high oil separation efficiency, a large amount of oil can be recovered, and the economic benefit is very good.
Description
Technical field
The present invention relates to a kind for the treatment of process of refinery water, belong to method of wastewater treatment field.
Background technology
Oil refining enterprise's efflux wastewater amount is comparatively large, and Pollutants in Wastewater concentration is higher, and principal pollutant comprise suspended substance, oils, phenol etc.The biodegradability of refinery water is lower, and organic loading is higher, if directly adopt biochemical process, not easily obtain stable good treatment effect, also must consume mass energy because carrying out long aeration, simultaneously refinery water quantity discharged is large, must the concentration of strict restriction water outlet water pollutant could the total amount of control polluted articles preferably.
Oils containing higher concentration in refinery water, is not easily not only biological degradation, and because oils concentration is high, can sticks to the surface of zoogloea or oxide film, make biological activity be subject to serious suppression.In addition, the material also containing the bio-toxicity such as prussiate or sulfide in waste water or inhibitory substance, should not adopt biological degradation process.
Therefore, study a kind of technique refinery water treatment process that is simple, stable, efficient, low consumption and there is good application prospect.
Summary of the invention
The present invention aims to provide that a kind of technique is simple, stable, efficient, the refinery water treatment process of low consumption.
The treatment process of refinery water of the present invention, comprises the following steps:
By refinery water through equalizing tank balanced water quality, the water yield, the waste water gravity flow after regulating enters in built-up type oil trap carries out oil removal process, the waste water sump pump after oil removal process is pumped into coagulation floatation and carries out air-flotation process, makes waste water can qualified discharge.
Preferably, built-up type oil trap of the present invention is built-up type oil trap, and for flat flow and ramp type are integrated, oil trap water inlet adopts gravity flow, stablizes amount of inlet water by floating ball type flow meter.
Preferred, coagulation floatation of the present invention to be in series air flotation pool for adopting two-stage, the structure of two cover air flotation pools with form identical.All add polymerize aluminum chloride coagulating agent in the water inlet of two-stage air flotation pool, the chemical feeding quantity of one-level air flotation pool controls at 80 ~ 160mg/L, and the chemical feeding quantity in secondary air-floatation pond controls at 60 ~ 100mg/L.
The effect of the equalizing tank in treatment process of the present invention is because generally the water quality of waste water fluctuates very greatly with the water yield, in order to more effectively regulating pondage and water quality, and hydraulic detention time 12h.Although equalizing tank has the regulating power of more efficient, but because the character of water differs greatly in each time, water quality in equalizing tank is made still to have certain fluctuation, especially the entering at random of acid waste water and alkaline waste water, the pH value of adjustment pool inner water is also fluctuated thereupon up and down, and then has influence on effect and the stability of subsequent disposal facility.When pH value as water is too high, alkaline matter is more, hydroaropic substance can be generated with oil, be not easy to be removed by oil removal By Bubble-floating Method; When the pH value of water is too low, also can have a negative impact to coagulation effect, etching apparatus and pipeline.For this reason, respectively to adding moderate amount of sulfuric acid or unslaked lime in equalizing tank, the pH value of equalizing tank water outlet is controlled between 6.7 ~ 8.0.
Oil trap in treatment process of the present invention is two parallel flow intercepters in parallel, and oil trap water inlet adopts gravity flow, stablizes amount of inlet water by floating ball type flow meter.In parallel flow intercepter, the minimum grain size of the elaioleucite that can be entirely removed is at least 150 μm, in order to improve the removal effect of elaioleucite, inclined plate grease district is set up in oil trap water side, the spacing of swash plate is 80mm, the minimum grain size of the elaioleucite that can be entirely removed in swash plate district is 60 μm, namely in sloping plate oil separation tank water outlet, can not contain the elaioleucite of particle diameter more than 60 μm.After elaioleucite in oil trap rises to the water surface, will form oil slick layer in face, pond, need on the water surface, establish Oil scraper to get rid of oil slick layer, because the flow velocity of oil removal pool inner water is slow, fluid stable even, the suspended substance in former water also will precipitate in oil trap.
The effect of the coagulation floatation in treatment process of the present invention; the elaioleucite of 60 μm and tiny suspended solids are less than for particle diameter; be difficult to float out in oil trap or sink to the bottom; because the surface of these tiny elaioleucites and solid particulate is with electric charge; mutual repulsion and in Brownian motion; be dispersed in water, the prerequisite effectively removing these emulsification elaioleucites or micelle eliminates or reduces intergranular electrostatic repulsion, and these particles namely must be made de-steady.In the present invention, polymerize aluminum chloride is adopted to make coagulating agent, carry out coagulation air-float, in order to fully ensure the treatment effect of air-flotation system, adopt two-stage air flotation pool to be in series in the present invention, the structure of two cover air flotation pools is identical with composition, comprise air flotation pool, dissolving, reflux pump, air compressor machine, buffer tank and chemicals dosing plant etc., air flotation pool is flat flow, and available depth is 2m, and hydraulic detention time is 0.6h.Perforated tube is established to collect clear water at the bottom of air flotation pool, the water outlet of one-level air flotation pool relies on waterhead automatically to flow to secondary air-floatation pond, a part for every grade of air flotation pool water outlet enters dissolving by reflux pump again, is part air-dissolving air-float, and the water inlet of dissolving and air inlet are provided by reflux water pump and air compressor machine respectively.All must add polymerize aluminum chloride coagulating agent in the water inlet of two-stage air flotation pool, and keep suitable dosage.In the present invention, the chemical feeding quantity of one-level air flotation pool should control at 80 ~ 160mg/L, and the chemical feeding quantity in secondary air-floatation pond should control at 60 ~ 100mg/L.
Treatment process of the present invention, adopt the art breading oily(waste)water that built-up type (flat flow and ramp type are integrated) oil trap and two-stage coagulation floatation are in series, under the condition such as dosage and effective molten gas of effective control temperature, pH value, coagulating agent, oils and solid matter can be removed well, also make COD obtain good removal effect simultaneously, owing to eliminating biochemical treatment unit, thus there is reduced investment and the advantage such as working cost is low, oil trap is high to oil separating efficiency, recyclable oil in a large number, economic benefit is fine.
Embodiment
Embodiment one:
By refinery water through equalizing tank balanced water quality, the water yield, waste water gravity flow after regulating enters in the built-up type oil trap that flat flow and ramp type be integrated carries out oil removal process, waste water sump pump after oil removal process is pumped into two-stage to be in series in air flotation pool and to carry out air-flotation process, the structure of two cover air flotation pools is identical with composition, polymerize aluminum chloride coagulating agent is all added in the water inlet of two-stage air flotation pool, the chemical feeding quantity of one-level air flotation pool controls at 80 ~ 160mg/L, the chemical feeding quantity in secondary air-floatation pond controls at 60 ~ 100mg/L, makes waste water can qualified discharge.
Embodiment two: treatment effect
The pH value 5 ~ 9 of the comprehensive factory effluent of certain oil refining enterprise, oils concentration 280 ~ 550mg/L, COD concentration 500 ~ 790mg/L, concentration of suspension is at 180-330mg/L.Local environmental administration requires that these factory and office manage in water outlet, oils≤10mg/L, COD≤70mg/L, suspended substance≤50mg/L.Use treatment process of the present invention, the treatment effect of each several part and total treatment effect are as shown in Table-1.
Table-1 water treatment effect
。
From the data of table 1, in water, the clearance of principal pollutant is higher, and the water outlet of secondary air-floatation pond is limpid, and substantially tasteless reaches emission standard.This cover treatment system less investment, working cost is low, and fully can reclaim oily substance, has good economic benefit.
Claims (3)
1. the treatment process of refinery water, comprises the following steps:
By refinery water through equalizing tank balanced water quality, the water yield, the waste water gravity flow after regulating enters in built-up type oil trap carries out oil removal process, the waste water sump pump after oil removal process is pumped into coagulation floatation and carries out air-flotation process, makes waste water can qualified discharge.
2. the treatment process of refinery water as claimed in claim 1, is characterized in that described built-up type oil trap is built-up type oil trap, and for flat flow and ramp type are integrated, oil trap water inlet employing gravity flow, stablize amount of inlet water by floating ball type flow meter.
3. the treatment process of refinery water as claimed in claim 1, is characterized in that described coagulation floatation to be in series air flotation pool for adopting two-stage, the structure of two cover air flotation pools with form identical;
All add polymerize aluminum chloride coagulating agent in the water inlet of two-stage air flotation pool, the chemical feeding quantity of one-level air flotation pool controls at 80 ~ 160mg/L, and the chemical feeding quantity in secondary air-floatation pond controls at 60 ~ 100mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410480894.9A CN104230055A (en) | 2014-09-19 | 2014-09-19 | Refinery wastewater treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410480894.9A CN104230055A (en) | 2014-09-19 | 2014-09-19 | Refinery wastewater treatment method |
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| Publication Number | Publication Date |
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| CN104230055A true CN104230055A (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410480894.9A Pending CN104230055A (en) | 2014-09-19 | 2014-09-19 | Refinery wastewater treatment method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104773891A (en) * | 2015-03-23 | 2015-07-15 | 王冰 | Novel oil-refining wastewater comprehensive processing system and method |
| CN114212869A (en) * | 2021-12-09 | 2022-03-22 | 苏州业华环境科技有限公司 | Preparation method of polycation polymer, compound oil removal agent and oil removal process |
-
2014
- 2014-09-19 CN CN201410480894.9A patent/CN104230055A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104773891A (en) * | 2015-03-23 | 2015-07-15 | 王冰 | Novel oil-refining wastewater comprehensive processing system and method |
| CN114212869A (en) * | 2021-12-09 | 2022-03-22 | 苏州业华环境科技有限公司 | Preparation method of polycation polymer, compound oil removal agent and oil removal process |
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Application publication date: 20141224 |
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| WD01 | Invention patent application deemed withdrawn after publication |