CN1227191A - Treating method for waste water of photographic film development - Google Patents
Treating method for waste water of photographic film development Download PDFInfo
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- CN1227191A CN1227191A CN 98100847 CN98100847A CN1227191A CN 1227191 A CN1227191 A CN 1227191A CN 98100847 CN98100847 CN 98100847 CN 98100847 A CN98100847 A CN 98100847A CN 1227191 A CN1227191 A CN 1227191A
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- waste water
- photographic film
- film development
- treatment process
- reaction
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- Water Treatment By Electricity Or Magnetism (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The treatment process for photographic film developing waste water is simple process of normal temperature and normal pressure and has high waste water treating effect owing to its electrochemical, oxidizing, flocculating and other treating functions. The treated waste water conforms to the national relevant exhaust standard.
Description
The present invention relates to a kind of treatment process of waste water of photographic film development, more particularly, relate to the wastewater treatment method that produces in a kind of filmstrip flushing process.
Usually, waste water of photographic film development comprises development, photographic fixing and poaching wastewater.Principal pollutant in the waste water are Na
2S
2O
3, Na
2SO
3, Resorcinol, benzoquinones and trace photographic developer, the principal pollutant index in the waste water is: COD300～2500mg/l, 40～200 times of colourities, photographic developer 10～80mg/l.This waste water national specified discharge standard is (GB8978-1996 sewage second-level emission standard): COD≤150mg/1, colourity≤80 times, photographic developer≤3mg/l.The pollutant load that both compare in the undressed waste water of photographic film development exceeds several times to tens times than GB.
At present, the method for processing photography developing and printing waste water mainly contains (1) NaClO oxide treatment method, (2) activated carbon adsorption facture, (3) and other types waste water mixing biochemical treatment process.Though these methods can both be handled this waste water effectively, all exist some shortcomings.Higher as oxidation style and active carbon adsorption cost, and biochemical process facility investment height, floor space are big, and this waste water COD clearance less than 50% of individual curing, effect is relatively poor.
Chinese patent CN91068799A discloses a kind of processing and reuse method of trade effluent, it is to be that main raw material is handled trade effluent with the waste iron filing, in electrochemical agglomeration filter bed, waste water flows from bottom to top, remains one section water column above the waste iron filing, can prevent the iron filings caking, waste water transfers to slightly acidic before advancing bed, after from bed, coming out, add liming and blowing air at once and stir, utilize nascent state Fe
2+And Fe
3+Active and synergy, improve flocculating effect, make water outlet reach the degree of reuse, by changing the collocation mode and the proportioning of filler in the electrochemical agglomeration filter bed, improve its soil removal efficiency and suitability.The defective of its existence is: what this invention was related is the treatment process of dyeing waste water, and waste water after treatment partly or entirely recycles again, at this moment desired water sample only otherwise influencing quality product gets final product and need not reach the sewage drainage standard of national regulation.
The objective of the invention is in order to overcome the defective that above-mentioned method of wastewater treatment exists, a kind of treatment process of waste water of photographic film development is provided, this method is carried out under normal temperature, normal pressure, simple to operate, because multiple processing capacities such as its combining electrochemical method, oxidation style and flocculence, treatment effect for waste water is better, and the waste water after the processing can reach the sewage drainage standard of national regulation.
The treatment process of a kind of waste water of photographic film development of the present invention comprises the steps:
(1) waste water being added acid makes the pH value be adjusted to 2～7;
(2) enter an electrochemical reactor of forming by iron filings and coke then and carry out electrochemical reaction,
10～60 ℃ of temperature of reaction, the reaction times is 0.25～24 hour;
(3) enter the oxidizing, flocculating reactor again, add oxygenant and carry out oxidizing reaction, oxidization time is
0.25～24 hours;
(4) waste water after the oxidation adds alkali and regulates the pH value and carry out flocculation treatment, and flocculating agent is in electrochemical reaction
In dissolve in ion Fe in the waste water
2+And Fe
3+
The water quality of the supernatant liquor of (5) discharging behind oxidizing, flocculating reaches the sewage two of GB8978-1996 regulation
The level emission standard.
In above-mentioned treatment process, at first in waste water, add acid, for example: H
2SO
4, HCl, the pH value is adjusted to 2～7, be preferably 3.5～5.5, enter an electrochemical reactor of forming by iron filings and coke then and carry out electrochemical reaction, in the electrochemical reactor, the weight ratio of filler iron filings and coke is 1: 1～3, and wherein iron filings can adopt pig scrap (slag), cast iron filing (slag), it is 10～60 ℃ that coke adopts temperature of reaction, is preferably 30～50 ℃; Reaction times is 0.25～24 hour, and the best is 4～8 hours.
COD reduces by 40～75% in the waste water after electrochemical reaction, enters the oxidizing, flocculating reactor, under agitation adds oxygenant and carries out oxidizing reaction, and oxygenant can adopt NaClO, CaOCl
2, H
2O
2, the add-on of oxygenant is 1～30% of a theoretical COD, is preferably 5～20%, and oxidization time is 0.5～24 hour, is preferably 1～3 hour, and the water sample after the oxidation for example adds alkali: NaOH, Ca (OH)
2The aqueous solution, regulate pH value to 8～9, carry out flocculation treatment, flocculation agent then is the ion Fe that dissolves in electrochemical reaction in the waste water
2+And Fe
3+, do not need to add flocculation agent in addition at this, dissolve in the Fe in the waste water
2+And Fe
3+Under suitable pH value condition, just can carry out flocculation treatment to waste water, remove the pollutent that part can not be removed by electrochemical reaction and oxidizing reaction, flocculating conditions is: temperature is 20～40 ℃, flocculation time is 10～30 minutes, the supernatant liquor outward appearance of discharging behind oxidizing, flocculating is a water white transparency, and the pH value is 8～9, COD≤150mg/L, photographic developer≤3mg/L, its water quality reaches the sewage second-level emission standard of GB8978-1996 regulation.
The present invention compared with prior art has the following advantages;
1. the entire sewage treating processes is to carry out under normal temperature, normal pressure, and is simple to operate;
2. method of wastewater treatment cost of the present invention is lower, only is equivalent to 1/3～2/3 of chemical oxidization method and active carbon adsorption cost;
3. the electrochemical reaction in the method for wastewater treatment of the present invention does not need additionaling power, do not need to add any chemical reagent yet, it is to utilize iron filings and carbon granules to form the principle of numerous small galvanic cell in electrolyte solution, make pollutants in waste water generation redox reaction and give the part removal, most COD is removed after electrochemical reaction, therefore also greatly reduce the add-on of oxygenant in the follow-up oxidation treatment step, its range of decrease is generally 40～60%;
4. method of wastewater treatment required equipment floor space of the present invention is little, only is equivalent to about 1/2nd of biochemical process;
5. owing to multiple processing capacities such as method of wastewater treatment combining electrochemical method of the present invention, oxidation style and flocculences, better for the treatment effect of waste water, its COD clearance is higher by 5～15% than other method.
Examples Example 1 at first adds H with the photography of certain news unit developing and printing waste water ph
2SO
4Be adjusted to 4.5, the electrochemical reactor of packing into then, in reactor with the tankage of common industrial coke and cast iron by etc. weight evenly mix and put, reaction is 4 hours under 25 ℃ of conditions, then waste water is added the oxidizing, flocculating reactor, under agitation condition, add 15mlNaClO solution/l waste water, (NaClO solution is the aqueous solution of 8wt%), react after 1 hour, water sample pH value is adjusted to 8.7, stirred quiescent setting 20 minutes 5 minutes, take out the clear liquid assay determination, the results are shown in Table 1:
Table 1
Example 2 adds H with the photography developing and printing waste water ph of certain news unit
2SO
4Be adjusted to 4.8, the electrochemical reactor of packing into then, in reactor with the tankage of common industrial coke and cast iron by etc. weight evenly mix and put, reaction is 6 hours under 26 ℃ of conditions, then waste water is added the oxidizing, flocculating reactor, under agitation condition, add 10mlNaClO solution/l waste water, react after 1 hour, water sample pH value is adjusted to 8.5, stirred 5 minutes, quiescent setting 30 minutes takes out the clear liquid assay determination, the results are shown in Table 2:
| Appearance color | The pH value | ?COD(mg/l) | Photographic developer (mg/l) | |
| Raw water quality | Yellowish | ????5.5 | ????1123 | ????15 |
| Water quality after the electrochemical treatment | Yellowish | ????6.7 | ????368 | ????4.2 |
| Water quality behind the oxidizing, flocculating | Water white transparency | ????8.7 | ????115 | ????2.5 |
Table 2
Example 3 adds the colour film waste water ph of processing HCl and is adjusted to 4.6, the electrochemical reactor of packing into then, in reactor with the tankage of common industrial coke and cast iron by etc. weight evenly mix and put, reacted at ambient temperature 4 hours, then waste water is added the oxidizing, flocculating reactor, under agitation condition, add 10mlNaClO solution/l waste water, react after 2 hours, water sample pH value is adjusted to 8.5, stirred 5 minutes, quiescent setting 30 minutes takes out the clear liquid assay determination, the results are shown in Table 3:
| Appearance color | The pH value | COD(mg/l) | Photographic developer (mg/l) | |
| Raw water quality | Yellowish | ????5.4 | ????964 | ????16 |
| Water quality after the electrochemical treatment | Yellowish | ????6.5 | ????345 | ????5.1 |
| Water quality behind the oxidizing, flocculating | Water white transparency | ????8.5 | ????108 | ????2.8 |
Table 3
| Appearance color | The pH value | COD(mg/l) | Photographic developer (mg/l) | |
| Raw water quality | Brown | ????6.8 | ????829 | ????11 |
| Water quality after the electrochemical treatment | Brown | ????6.6 | ????302 | ????3.8 |
| Water quality behind the oxidizing, flocculating | Water white transparency | ????8.5 | ????101 | ????2.1 |
Claims (5)
1. the treatment process of a waste water of photographic film development is characterized in that, comprises the steps:
(1) waste water being added acid makes the pH value be adjusted to 2～7;
(2) enter then in the electrochemical reactor of forming by iron filings and coke and carry out electrochemical reaction, 10～60 ℃ of temperature of reaction, the reaction times is 0.25～24 hour;
(3) enter the oxidizing, flocculating reactor again, add oxygenant and carry out oxidizing reaction, oxidization time is 0.25～24 hour;
(4) waste water after the oxidation adds alkali and regulates pH value and carry out flocculation treatment, and flocculating agent is the ion Fe that dissolves in electrochemical reaction in the waste water
2+And Fe
3+
The water quality of the supernatant liquor of (5) discharging behind oxidizing, flocculating reaches the sewage second-level emission standard of GB8978-1996 regulation.
2. the treatment process of waste water of photographic film development according to claim 1 is characterized in that, in the described electrochemical reactor, the weight ratio of filler iron filings and coke is 1: 1～3.
3. the treatment process of waste water of photographic film development according to claim 1 is characterized in that, described oxygenant is NaClO, CaOCl
2, H
2O
2, in a kind of, or their mixture.
4. the treatment process of waste water of photographic film development according to claim 1 is characterized in that, described flocculation treatment condition is: 20～40 ℃ of temperature, flocculation time 10～30 minutes.
5. the treatment process of waste water of photographic film development according to claim 1 is characterized in that, described alkali is NaOH or Ca (OH)
2The aqueous solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100847 CN1079375C (en) | 1998-02-24 | 1998-02-24 | Treating method for waste water of photographic film development |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100847 CN1079375C (en) | 1998-02-24 | 1998-02-24 | Treating method for waste water of photographic film development |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1227191A true CN1227191A (en) | 1999-09-01 |
| CN1079375C CN1079375C (en) | 2002-02-20 |
Family
ID=5216287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98100847 Expired - Fee Related CN1079375C (en) | 1998-02-24 | 1998-02-24 | Treating method for waste water of photographic film development |
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| Country | Link |
|---|---|
| CN (1) | CN1079375C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102249460A (en) * | 2011-06-16 | 2011-11-23 | 蓝星环境工程有限公司 | Pretreatment method for photosensitive material waste water |
| CN103408185A (en) * | 2013-07-15 | 2013-11-27 | 江苏好收成韦恩农化股份有限公司 | Advanced treatment method for organic phosphorus pesticide wastewater |
| CN115367907A (en) * | 2022-07-07 | 2022-11-22 | 深圳瑞赛环保科技有限公司 | Comprehensive treatment method for various waste liquids of PCB (printed circuit board) |
-
1998
- 1998-02-24 CN CN 98100847 patent/CN1079375C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102249460A (en) * | 2011-06-16 | 2011-11-23 | 蓝星环境工程有限公司 | Pretreatment method for photosensitive material waste water |
| CN102249460B (en) * | 2011-06-16 | 2013-04-10 | 蓝星环境工程有限公司 | Pretreatment method for photosensitive material waste water |
| CN103408185A (en) * | 2013-07-15 | 2013-11-27 | 江苏好收成韦恩农化股份有限公司 | Advanced treatment method for organic phosphorus pesticide wastewater |
| CN115367907A (en) * | 2022-07-07 | 2022-11-22 | 深圳瑞赛环保科技有限公司 | Comprehensive treatment method for various waste liquids of PCB (printed circuit board) |
| CN115367907B (en) * | 2022-07-07 | 2023-04-25 | 深圳瑞赛环保科技有限公司 | Comprehensive treatment method for various waste liquid of PCB |
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| Publication number | Publication date |
|---|---|
| CN1079375C (en) | 2002-02-20 |
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