CN101684025A - Process for treating waste water containing alkali and oil - Google Patents
Process for treating waste water containing alkali and oil Download PDFInfo
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- CN101684025A CN101684025A CN200810013377A CN200810013377A CN101684025A CN 101684025 A CN101684025 A CN 101684025A CN 200810013377 A CN200810013377 A CN 200810013377A CN 200810013377 A CN200810013377 A CN 200810013377A CN 101684025 A CN101684025 A CN 101684025A
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- waste
- water
- oily
- alkali
- treatment process
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention relates to a process for treating waste water containing alkali and oil. The process comprises the following steps: neutralizedly treating the waste water containing alkali and oil; thensequentially carrying out inclined plate precipitation, tapes filtration and ultra-filtration treatment; finally discharging. The neutralization is achieved in a step that the waste water containingalkali and oil is neutralized by adding oxidized acid, and meanwhile, emulsion breaking, delamination as well as oil-water separation are carried out also by same. The process adopts neutralization and flocculation firstly and then carries out ultra-filtration treatment, after which the water quality is good, and less chemical agents are used.
Description
Technical field
The present invention relates to a kind of alkali oily(waste)water treatment process that contains.
Background technology
In the prior art, processing contains the alkali oily(waste)water, usually the method that adopts is that waste water enters wastewater equalization pond, carry out entering circulatory pool after the pre-treatment, carry out loop ultrafiltration, the filtrate after the uf processing is disposed to the acid-base neutralisation system, after neutralization reaches pH value and is 6-9, add flocculation agent formation alumen ustum and precipitate, filter by more medium filter again; Oil slick on the circulating box is removed with the belt oil removal machine, transports outward after delivering to the waste oil storage tank.Dense oily(waste)water in the ultrafiltration circulating box is regularly delivered to dope with concentrate pump and is decomposed case, through heating, add acid and leave standstill after oily water separation, the oily(waste)water that dope decomposes lower box part continues uf processing with being pumped to the oily(waste)water equalizing tank, and the top oil slick is evacuated to the outward transport of waste oil storage tank with pump.Ultrafiltration system also is provided with washing unit, regularly ultra-filtration membrane equipment is cleaned, and to recover the permeation flux of ultra-filtration membrane equipment, used wiping solution drains into equalizing tank.
This method adopts first uf processing, neutralization again, flocculation treatment, filtration, increased the cleaning amount of ultrafiltration apparatus, influence the working efficiency and the work-ing life of ultrafiltration apparatus, flocculation agent and cleaning agent consumption are many, desilting workload in the circulatory pool is big, and the alkali oily(waste)water water-quality guideline that contains after the processing is not very high.
Particularly for from containing the alkali oily(waste)water between the unit of cold rolling mill, because its oil-containing and emulsifying liquid waste water chemical stability are good, the water quality complicated situation is handled back water quality and is difficult to reach required standard.
Summary of the invention
The purpose of this invention is to provide a kind of alkali oily(waste)water treatment process that contains, this process using neutralizes, flocculates, carries out uf processing earlier, and it is good to handle back water quality, and consumption of chemical agent is few.
For achieving the above object, the present invention realizes by the following technical solutions:
A kind of alkali oily(waste)water treatment process that contains, this technological process are to carry out neutralizing treatment earlier with containing the alkali oily(waste)water, successively by precipitation, filtration, uf processing, carry out discharging process at last then.
Described N-process is to add oxidizing acid to neutralize to containing the alkali oily(waste)water, simultaneously, also carries out breakdown of emulsion, layering by oxidizing acid, carries out oily water separation.
Described precipitation process adopts sloping plate deposition.
Described filtration procedure adopts paper tape to filter.
Described uf processing adopts ultra-filtration membrane.
Waste water pH value=7.2-8.2 after the described neutralizing treatment.
Described film work of treatment temperature is 42-52 ℃.
This technology is applicable to handles the ferruginous alkali oily(waste)water that contains of cold rolling mill.
The alkali oily(waste)water that contains for other field is handled, iron ion less situation under, can in waste water, add an amount of ferric flocculant.
Compared with prior art, the invention has the beneficial effects as follows:
1) the flocculation agent consumption is few;
2) cleaning interval of ultra-filtration equipment and the life cycle of chemical agent have been prolonged.
3) technology is reasonable, and input cost is low.
Embodiment
Be example to handle the ferruginous alkali oily(waste)water that contains of cold rolling mill below, narrate specific implementation process of the present invention.
A kind of alkali oily(waste)water treatment process that contains, this technological process is described below:
1) oxidizing acid neutralization; At first will contain the alkali oily(waste)water and carry out neutralizing treatment earlier, and add oxidizing acid (nitric acid or sulfuric acid) and neutralize, simultaneously, also carry out breakdown of emulsion, layering, make the most of separation of profit by oxidizing acid to containing the alkali oily(waste)water; Waste water pH value=7.2-8.2 after the neutralizing treatment.。
2) sloping plate deposition; Above-mentioned waste water is carried out sloping plate deposition, can remove suspended substance and oil slick about 50%.
3) paper tape filters; In this process, cocoa is removed about 30% suspended substance and oil slick.
4) uf processing; About 20% of a need filtering remainder suspended substance and oil slick in this process.Film work of treatment temperature is 42-52 ℃ and is the best.
The present invention has been owing to carried out neutralization, precipitation, paper bag filter filtration treatment to waste water before uf processing, carry out ultrafiltration after making water quality that large increase arranged, and is not easy to cause ultra-filtration membrane to stop up, and the life cycle of ultra-filtration membrane and cleaning interval are prolonged greatly.Before uf processing, there is 80% oil-containing impurity to remove in the waste water nearly, in process of ultrafiltration treatment, can be with residual about 20% Impurity removal.
Claims (9)
1, a kind of alkali oily(waste)water treatment process that contains is characterized in that, this technological process is to carry out neutralizing treatment earlier with containing the alkali oily(waste)water, successively by precipitation, filtration, uf processing, carries out discharging process at last then.
2, a kind of alkali oily(waste)water treatment process that contains according to claim 1 is characterized in that, described N-process is to add oxidizing acid to neutralize to containing the alkali oily(waste)water, simultaneously, also carries out breakdown of emulsion, layering by oxidizing acid, carries out oily water separation.
3, a kind of alkali oily(waste)water treatment process that contains according to claim 1 is characterized in that, described precipitation process adopts sloping plate deposition.
4, a kind of alkali oily(waste)water treatment process that contains according to claim 1 is characterized in that, described filtration procedure adopts paper tape to filter.
5, a kind of alkali oily(waste)water treatment process that contains according to claim 1 is characterized in that, described uf processing adopts ultra-filtration membrane.
6, a kind of alkali oily(waste)water treatment process that contains according to claim 1 is characterized in that the waste water pH value=7.2-8.2 after the described neutralizing treatment.
7, a kind of alkali oily(waste)water treatment process that contains according to claim 1 is characterized in that, described film work of treatment temperature is 42-52 ℃.
8, a kind of alkali oily(waste)water treatment process that contains according to claim 1 is characterized in that, this technology is applicable to handles the ferruginous alkali oily(waste)water that contains of cold rolling mill.
9, a kind of alkali oily(waste)water treatment process that contains according to claim 1 is characterized in that, handle for the alkali oily(waste)water that contains in other field, iron ion less situation under, can in waste water, add an amount of ferric flocculant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810013377A CN101684025B (en) | 2008-09-26 | 2008-09-26 | Process for treating waste water containing alkali and oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810013377A CN101684025B (en) | 2008-09-26 | 2008-09-26 | Process for treating waste water containing alkali and oil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101684025A true CN101684025A (en) | 2010-03-31 |
| CN101684025B CN101684025B (en) | 2012-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810013377A Active CN101684025B (en) | 2008-09-26 | 2008-09-26 | Process for treating waste water containing alkali and oil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212238A (en) * | 2012-01-19 | 2013-07-24 | 昆山思拓机器有限公司 | Water circulation system for laser wet-cutting system and filter paper strip replacement method therefor |
| CN103523946A (en) * | 2013-08-09 | 2014-01-22 | 中持（北京）水务运营有限公司 | Pre-treatment method of emulsion wastewater |
| CN108640314A (en) * | 2018-05-30 | 2018-10-12 | 重庆万达薄板有限公司 | A kind of pre-treatment strip wastewater recycling system |
-
2008
- 2008-09-26 CN CN200810013377A patent/CN101684025B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212238A (en) * | 2012-01-19 | 2013-07-24 | 昆山思拓机器有限公司 | Water circulation system for laser wet-cutting system and filter paper strip replacement method therefor |
| CN103212238B (en) * | 2012-01-19 | 2015-12-02 | 昆山思拓机器有限公司 | Wet for laser the replacing options of water circulation system in cutting system and filter-paper-tape thereof |
| CN103523946A (en) * | 2013-08-09 | 2014-01-22 | 中持（北京）水务运营有限公司 | Pre-treatment method of emulsion wastewater |
| CN103523946B (en) * | 2013-08-09 | 2015-05-13 | 中持水务股份有限公司 | Pre-treatment method of emulsion wastewater |
| CN108640314A (en) * | 2018-05-30 | 2018-10-12 | 重庆万达薄板有限公司 | A kind of pre-treatment strip wastewater recycling system |
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| Publication number | Publication date |
|---|---|
| CN101684025B (en) | 2012-08-29 |
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