CN103663865A - Leather wastewater treatment process - Google Patents
Leather wastewater treatment process Download PDFInfo
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- CN103663865A CN103663865A CN201310618575.5A CN201310618575A CN103663865A CN 103663865 A CN103663865 A CN 103663865A CN 201310618575 A CN201310618575 A CN 201310618575A CN 103663865 A CN103663865 A CN 103663865A
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Abstract
The invention discloses a leather wastewater treatment process which comprises steps as follows: a, desulfuration treatment; b, recycling of chromium salt; c, air-floated oil removal; d, oxidation treatment; e, hydrolytic acidification; f, decomposition of an aerobiotic tank; and g, secondary sedimentation. According to the leather wastewater treatment process, macromolecular organic matters difficult to remove and separate before biochemical treatment of leather wastewater are converted into low-molecular organic matters, so that the biological degradability of wastewater is improved.
Description
Technical field
The present invention relates to a kind of leather waste water treatment technique.
Technical background
Leather waste water, by alkaline liming hair removal wastewater and weakly acidic tanning waste water composition, contains the pollutents such as tanning material, muriate, sulfide, tensio-active agent, chemical assistant, grease, protein and SS of high density in waste water.
Leather waste water can be biochemical better, the general equal biochemical process that adopts is processed, but in waste water, often contains sulfide and chromium ion, can suppress microorganisms, therefore will carry out pre-treatment to waste water, so in the improvement of leather waste water, generally all adopt materialization and the biochemical treatment process combining.
Yet in leather waste water, contain the macromolecular compounds such as more softening agent, permeate agent and tensio-active agent, traditional materialization treatment process is difficult to the content of these materials to be down to lower level, thereby while causing leather waste water to enter biochemical processing process, these materials are relatively difficult to be biodegradable.
Summary of the invention
The technical problem that the present invention solves provides a kind of leather waste water treatment technique that improves the biodegradable of leather waste water.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of leather waste water treatment technique, comprises the following steps:
A, desulfurization are processed: leather waste water is collected into the first settling tank, add sulfuric acid to regulate waste water pH value to 6-9, drop into the standing 4-5h precipitation of ferrous sulfate iron sulphide, and iron sulphide is collected into sludge system and focuses on, and supernatant liquid enters the second settling tank;
B, recovery chromic salts: in the second settling tank, drop into sodium hydroxide and generate chromium hydroxide precipitation, chromium hydroxide suspension after precipitation is evacuated to pressure filter and carries out press filtration, the sodium hydroxide glaur that press filtration obtains is collected into sludge system recycling, and the waste water of filtration enters air flotation pool;
C, oil removal by air bubbling: in air flotation pool, with the grease in the separated waste water of By Bubble-floating Method, mud is collected into sludge system, clear liquid enters retort;
D, oxide treatment: in retort, pass into ozone, the macromolecule organic in waste water is transformed into low molecule organic matter, waste water enters hydrolysis acidification pool;
E, acidication: in hydrolysis acidification pool, drop into lytic enzyme, further macromolecule organic is hydrolyzed into low molecule, drop into afterwards acidifying bacterium, dissolved organic matter is converted into and take voltaile fatty acid as main end products;
F, Aerobic Pond decompose: the waste water after acidication enters Aerobic Pond, through aerobic bacteria biological degradation, reaches higher COD clearance;
G, secondary sedimentation: the waste water after Aerobic Pond is processed enters secondary sedimentation basins, makes muddy water obtain separation, and waste water reaches discharging standards.
Preferably, influx and the spout of described the first settling tank and the second settling tank are respectively equipped with grid.
Preferably, in described step c, in air flotation pool, drop into the aluminium chlorohydroxide of 0.03%-0.05%.
The present invention improves leather waste water treatment technique, with ozone, macromolecule organic in leather waste water is oxidized to low molecule organic matter, leather waste water further changes into macromolecule organic the low molecule organic matter of easy degraded by acidication technique, improve the biodegradable of waste water, can also solve the bubble-related issues in wastewater treatment process, and sludge output is few, for solving a large amount of mud that produce in leather waste water processing, provide an approach.
Embodiment
Leather waste water treatment technique of the present invention, comprises the following steps:
A, desulfurization are processed: leather waste water is collected into the first settling tank, add sulfuric acid to regulate waste water pH value to 6-9, drop into the standing 4-5h precipitation of ferrous sulfate iron sulphide, and iron sulphide is collected into sludge system and focuses on, and supernatant liquid enters the second settling tank;
B, recovery chromic salts: in the second settling tank, drop into sodium hydroxide and generate chromium hydroxide precipitation, chromium hydroxide suspension after precipitation is evacuated to pressure filter and carries out press filtration, the sodium hydroxide glaur that press filtration obtains is collected into sludge system recycling, and the waste water of filtration enters air flotation pool;
C, oil removal by air bubbling: in air flotation pool, with the grease in the separated waste water of By Bubble-floating Method, mud is collected into sludge system, clear liquid enters retort;
D, oxide treatment: in retort, pass into ozone, the macromolecule organic in waste water is transformed into low molecule organic matter, waste water enters hydrolysis acidification pool;
E, acidication: in hydrolysis acidification pool, drop into lytic enzyme, further macromolecule organic is hydrolyzed into low molecule, drop into afterwards acidifying bacterium, dissolved organic matter is converted into and take voltaile fatty acid as main end products;
F, Aerobic Pond decompose: the waste water after acidication enters Aerobic Pond, through aerobic bacteria biological degradation, reaches higher COD clearance;
G, secondary sedimentation: the waste water after Aerobic Pond is processed enters secondary sedimentation basins, makes muddy water obtain separation, and waste water reaches discharging standards.
Influx and the spout of described the first settling tank and the second settling tank are respectively equipped with grid.In described step c, in air flotation pool, drop into the aluminium chlorohydroxide of 0.03%-0.05%, can remove CODcr and BOD5 approximately 50%, more than S2-70%, SS and colourity are more than 80%
Wherein, the entrance of the first settling tank and the second settling tank arranges pH monitor.Waste water mainly dropped to below 40 ℃ temperature by heat sink before entering hydrolysis acidification pool, to guarantee the eubolism of microorganism.
Claims (3)
1. a leather waste water treatment technique, is characterized in that: comprise the following steps:
A, desulfurization are processed: leather waste water is collected into the first settling tank, add sulfuric acid to regulate waste water pH value to 6-9, drop into the standing 4-5h precipitation of ferrous sulfate iron sulphide, and iron sulphide is collected into sludge system and focuses on, and supernatant liquid enters the second settling tank;
B, recovery chromic salts: in the second settling tank, drop into sodium hydroxide and generate chromium hydroxide precipitation, chromium hydroxide suspension after precipitation is evacuated to pressure filter and carries out press filtration, the sodium hydroxide glaur that press filtration obtains is collected into sludge system recycling, and the waste water of filtration enters air flotation pool;
C, oil removal by air bubbling: in air flotation pool, with the grease in the separated waste water of By Bubble-floating Method, mud is collected into sludge system, clear liquid enters retort;
D, oxide treatment: in retort, pass into ozone, the macromolecule organic in waste water is transformed into low molecule organic matter, waste water enters hydrolysis acidification pool;
E, acidication: in hydrolysis acidification pool, drop into lytic enzyme, further macromolecule organic is hydrolyzed into low molecule, drop into afterwards acidifying bacterium, dissolved organic matter is converted into and take voltaile fatty acid as main end products;
F, Aerobic Pond decompose: the waste water after acidication enters Aerobic Pond, through aerobic bacteria biological degradation, reaches higher COD clearance;
G, secondary sedimentation: the waste water after Aerobic Pond is processed enters secondary sedimentation basins, makes muddy water obtain separation, and waste water reaches discharging standards.
2. a kind of leather waste water treatment technique according to claim 1, is characterized in that: influx and the spout of described the first settling tank and the second settling tank are respectively equipped with grid.
3. a kind of leather waste water treatment technique according to claim 1, is characterized in that: the aluminium chlorohydroxide that drops into 0.03%-0.05% in described step c in air flotation pool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310618575.5A CN103663865A (en) | 2013-11-27 | 2013-11-27 | Leather wastewater treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310618575.5A CN103663865A (en) | 2013-11-27 | 2013-11-27 | Leather wastewater treatment process |
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| CN103663865A true CN103663865A (en) | 2014-03-26 |
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| CN201310618575.5A Pending CN103663865A (en) | 2013-11-27 | 2013-11-27 | Leather wastewater treatment process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880221A (en) * | 2014-04-15 | 2014-06-25 | 中国皮革和制鞋工业研究院 | Process for treating and recycling wet finishing mixing wastewater in leather production |
| CN104787960A (en) * | 2014-12-10 | 2015-07-22 | 重庆隆发皮革制品有限责任公司 | Treatment technology and treatment system of leather waste water |
| CN111547957A (en) * | 2020-05-25 | 2020-08-18 | 西安优瑞卡环保科技有限公司 | Biological desulfurization device and method for leather unhairing wastewater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387310A (en) * | 2013-05-27 | 2013-11-13 | 三达膜科技（厦门）有限公司 | Leather wastewater treating method |
-
2013
- 2013-11-27 CN CN201310618575.5A patent/CN103663865A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387310A (en) * | 2013-05-27 | 2013-11-13 | 三达膜科技（厦门）有限公司 | Leather wastewater treating method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880221A (en) * | 2014-04-15 | 2014-06-25 | 中国皮革和制鞋工业研究院 | Process for treating and recycling wet finishing mixing wastewater in leather production |
| CN103880221B (en) * | 2014-04-15 | 2016-04-06 | 中国皮革和制鞋工业研究院 | A kind of leather is wet ornamenting composite waste treatment for reuse technique in producing |
| CN104787960A (en) * | 2014-12-10 | 2015-07-22 | 重庆隆发皮革制品有限责任公司 | Treatment technology and treatment system of leather waste water |
| CN111547957A (en) * | 2020-05-25 | 2020-08-18 | 西安优瑞卡环保科技有限公司 | Biological desulfurization device and method for leather unhairing wastewater |
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Application publication date: 20140326 |