CN104118949A - A cold-rolling wastewater treating process - Google Patents
A cold-rolling wastewater treating process Download PDFInfo
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- CN104118949A CN104118949A CN201410313424.3A CN201410313424A CN104118949A CN 104118949 A CN104118949 A CN 104118949A CN 201410313424 A CN201410313424 A CN 201410313424A CN 104118949 A CN104118949 A CN 104118949A
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Abstract
A cold-rolling wastewater treating process is disclosed. The treating process includes: subjecting cold-rolling wastewater to deep treatment by utilization of a multi-media filter, an ozone contact reacting tower, a middle water tank and a biological active carbon filter tank; and cleaning the multi-media filter, the ozone contact reacting tower and the biological active carbon filter tank through a gas-water alternative backwashing manner. A draught fan provides a gas source. Backwashing water is provided by pumping out water in a water tank by a backwashing pump so that the water is reutilized, thus achieving an effect of energy conservation and emission reduction. The process has characteristics of simple equipment, reliable running and ideal treating effects. After treatment by the process, the CODcr of discharged water is lower than 30 mg/L and the SS is lower than 10 mg/L, thus meeting discharging requirements. In addition, the discharged water can be reutilized, the quality of the discharged water can guarantee stable working of a subsequent reutilization process, and reduce the load of subsequent equipment.
Description
Technical field
The present invention relates to field of waste water treatment, be specially a kind of cold rolling wastewater treatment process.
Background technology
Cold rolling wastewater character, the water yield and range of product and processing condition are in close relations, mainly comprise three kinds of waste water: oil-containing and emulsifying liquid waste water, acidic and alkaline waste water, chromate waste water etc.
The treatment process of cold rolling wastewater routine is directly discharge after neutralization, coagulation, air supporting, catalytic oxidation, precipitation, filtration reach wastewater discharge standard.
China has strengthened the dynamics of environmental protection in recent years, requires more and more highlyer, and each place Environmental Protection Agency is active response promulgate new emission standard also.Owing to processing (pre-treatment+biochemical process+sloping plate deposition) through common process, water outlet CODcr content reaches 80～100mg/L, has not reached new emission standard at present.
Summary of the invention
The technical problem to be solved in the present invention is to overcome existing defect, and a kind of cold rolling wastewater treatment process is provided.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
The waste water producing in cold-rolling process is processed through following concrete steps:
1) by the cold rolling wastewater after cooling, neutralization reaction, coagulation, air supporting, biochemistry, in inclined-plate clarifying basin, precipitate, remove the suspended sediment in water, then through the first transfer lime, enter more medium filter.On the first transfer lime, be provided with flocculation agent chemicals dosing plant, before entering more medium filter, add appropriate flocculation agent PAC, cold rolling wastewater cold rolling wastewater in more medium filter grades to act on through absorption, sedimentation, mechanical picker and removes SS, colloid and part COD in water.
2) water outlet after more medium filter is processed enters ozone contact reaction tower through the second transfer lime.Under the combined action of ozone, catalyzer, difficult biochemical substances inorganicization of part or be degraded to can biochemical substances in cold rolling wastewater, larger molecular organics is decomposed into small organic molecule, significantly improve the B/C ratio of waste water, strengthen rear class biological activated carbon filter to organic removal ability, thereby reach the object of COD in effective removal waste water.
3) water outlet after ozone contact reaction tower is processed enters intermediate pool through the 3rd transfer lime, carries out buffer memory, and makes ozone residual in waste water carry out self-decomposition, to eliminate the impact on rear class biochemical system.
4) water outlet of carrying out buffer memory through intermediate pool enters biological activated carbon filter through the middle water pump on the 4th transfer lime; Biological activated carbon filter is the organism in planar water first, then the organism of absorption is degraded again, thereby removes the COD in water, and last water outlet enters outlet sump.
5) water outlet after biological activated carbon filter is processed enters outlet sump through the 5th transfer lime.
6) air-water of more medium filter, ozone contact reaction tower and biological activated carbon filter is replaced to backwash; Backwash water pump extracts the water in pond more medium filter, ozone contact reaction tower and biological activated carbon filter is washed; Backwash water enters biological activated carbon filter through backwash water house steward and the first backwash arm, through the first backwash delivery pipe, discharges; Backwash water enters ozone contact reaction tower through backwash water house steward and the second backwash arm, through the second backwash delivery pipe, discharges; Backwash water enters more medium filter through backwash water house steward and the 3rd backwash arm, through the 3rd backwash delivery pipe, discharges; Blower fan provides source of the gas by inlet manifold for more medium filter, ozone contact reaction tower and biological activated carbon filter, wherein source of the gas enters more medium filter by the first inlet pipe, by the second inlet pipe, enter biological activated carbon filter, the oxygen that ozonizer produces enters ozone contact reaction tower by ozone inlet manifold.
The beneficial effect of cold rolling wastewater technique of the present invention is:
This processing unit is simple, reliable, ideal treatment effect.After this art breading, the CODcr of water outlet is less than 30mg/L, and SS is less than 10mg/L, reaches emission request.If effluent reuse, effluent quality can guarantee the steady operation of follow-up reuse technology, reduces the load of follow-up equipment.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, for explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
As shown in Figure 1, a kind of cold rolling wastewater treatment process, comprises the steps:
1) by the cold rolling wastewater after cooling, neutralization reaction, coagulation, air supporting, biochemistry, in inclined-plate clarifying basin, precipitate, get rid of suspended sediment, then through the first transfer lime 1, enter more medium filter 3.On the first transfer lime 1, be provided with flocculation agent chemicals dosing plant 2, before entering more medium filter 3, add appropriate flocculation agent PAC, cold rolling wastewater cold rolling wastewater in more medium filter grades to act on through absorption, sedimentation, mechanical picker and removes SS, colloid and part COD in cold rolling wastewater.
2) water outlet after more medium filter 3 is processed enters ozone contact reaction tower 5 through the second transfer lime 4.Under the combined action of ozone, catalyzer, difficult biochemical substances inorganicization of part or be degraded to can biochemical substances in cold rolling wastewater, larger molecular organics is decomposed into small organic molecule, significantly improve the B/C ratio of waste water, strengthen rear class biological activated carbon filter to organic removal ability, thereby reach the object of COD in effective removal waste water.
3) water outlet after ozone contact reaction tower 5 is processed enters intermediate pool 7 through the 3rd transfer lime 6, carries out buffer memory, and makes ozone residual in waste water carry out self-decomposition, to eliminate the impact on rear class biochemical system.
4) water outlet of carrying out buffer memory through intermediate pool 7 enters biological activated carbon filter 10 through the middle water pump 8 on the 4th transfer lime 9; First biological activated carbon filter 10 adsorbs the organism in waste water, then again to absorption organism degrade, thereby remove the COD in water, last water outlet enters outlet sump 12.
5) water outlet after biological activated carbon filter 10 is processed enters outlet sump 12 through the 5th transfer lime 11.
6) air-water of more medium filter 3, ozone contact reaction tower 5 and biological activated carbon filter 10 is replaced to backwash; Backwash water pump 13 extracts the water in pond 12 more medium filter 3, ozone contact reaction tower 5 and biological activated carbon filter 10 is washed; Backwash water enters biological activated carbon filter 10 through backwash water house steward 14 and the first backwash arm 15, through the first backwash delivery pipe 17, discharges; Backwash water enters ozone contact reaction tower 5 through backwash water house steward 14 and the second backwash arm 18, through the second backwash delivery pipe 19, discharges; Backwash water enters more medium filter 3 through backwash water house steward 14 and the 3rd backwash arm 22, through the 3rd backwash delivery pipe 20, discharges; Blower fan provides source of the gas by inlet manifold 23 for more medium filter 3, ozone contact reaction tower 5 and biological activated carbon filter 10, wherein source of the gas enters more medium filter 3 by the first inlet pipe 21, by the second inlet pipe 16, enter biological activated carbon filter 10, the oxygen that ozonizer produces enters ozone contact reaction tower 5 by ozone inlet manifold 24.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. a cold rolling wastewater treatment process, is characterized in that comprising the following steps:
(1) by the cold rolling wastewater after cooling, neutralization reaction, coagulation, air supporting, biochemistry, in inclined-plate clarifying basin, precipitate, then through the first transfer lime, enter more medium filter, enter before more medium filter and add appropriate flocculation agent PAC by flocculation agent chemicals dosing plant;
(2) water outlet after more medium filter is processed enters ozone contact reaction tower through the second transfer lime;
(3) water outlet after ozone contact reaction tower is processed enters intermediate pool through the 3rd transfer lime, carries out buffer memory;
(4) water outlet of carrying out buffer memory through intermediate pool enters biological activated carbon filter through the middle water pump on the 4th transfer lime;
(5) water outlet after biological activated carbon filter is processed enters outlet sump through the 5th transfer lime;
(6) air-water of more medium filter, ozone contact reaction tower and biological activated carbon filter is replaced to backwash;
Backwash water pump extracts the water in pond more medium filter, ozone contact reaction tower and biological activated carbon filter is washed; Backwash water enters biological activated carbon filter through backwash water house steward and the first backwash arm, through the first backwash delivery pipe, discharges; Backwash water enters ozone contact reaction tower through backwash water house steward and the second backwash arm, through the second backwash delivery pipe, discharges; Backwash water enters more medium filter through backwash water house steward and the 3rd backwash arm, through the 3rd backwash delivery pipe, discharges;
Blower fan provides source of the gas by inlet manifold for more medium filter, ozone contact reaction tower and biological activated carbon filter, wherein source of the gas enters more medium filter by the first inlet pipe, by the second inlet pipe, enter biological activated carbon filter, the oxygen that ozonizer produces enters ozone contact reaction tower by ozone inlet manifold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410313424.3A CN104118949A (en) | 2014-07-02 | 2014-07-02 | A cold-rolling wastewater treating process |
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| CN201410313424.3A CN104118949A (en) | 2014-07-02 | 2014-07-02 | A cold-rolling wastewater treating process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106977025A (en) * | 2016-01-15 | 2017-07-25 | 宝山钢铁股份有限公司 | Organic pollutant degradation method and device in a kind of emulsion Aerobic Pond water outlet |
| CN106977005A (en) * | 2016-01-19 | 2017-07-25 | 宝山钢铁股份有限公司 | A kind of processing method and processing unit of cold rolling diluted alkaline discharged wastewater met the national standard |
| CN107758913A (en) * | 2016-08-19 | 2018-03-06 | 宝山钢铁股份有限公司 | A kind of method and apparatus for removing total organic carbon in cold rolling acid waste water |
| CN113511740A (en) * | 2021-05-11 | 2021-10-19 | 山东泰山轧钢有限公司 | Secondary demulsification treatment method for cold rolling oily wastewater |
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| CN106977025A (en) * | 2016-01-15 | 2017-07-25 | 宝山钢铁股份有限公司 | Organic pollutant degradation method and device in a kind of emulsion Aerobic Pond water outlet |
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| CN107758913A (en) * | 2016-08-19 | 2018-03-06 | 宝山钢铁股份有限公司 | A kind of method and apparatus for removing total organic carbon in cold rolling acid waste water |
| CN113511740A (en) * | 2021-05-11 | 2021-10-19 | 山东泰山轧钢有限公司 | Secondary demulsification treatment method for cold rolling oily wastewater |
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Application publication date: 20141029 |