CN102417275B - System and method for comprehensive treatment of pickling process waste water and leather-making process waste water - Google Patents
System and method for comprehensive treatment of pickling process waste water and leather-making process waste water Download PDFInfo
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- CN102417275B CN102417275B CN 201110312106 CN201110312106A CN102417275B CN 102417275 B CN102417275 B CN 102417275B CN 201110312106 CN201110312106 CN 201110312106 CN 201110312106 A CN201110312106 A CN 201110312106A CN 102417275 B CN102417275 B CN 102417275B
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Abstract
The invention discloses a system and a method for comprehensive treatment of pickling process waste water and leather-making process waste water; the system orderly comprises a filter tank, a primary sedimentation tank, a temperature adjusting tank, a coagulation sedimentation tank, a flotation tank, an acidifying hydrolyzing tank, an aerobic tank, and a secondary sedimentation tank which are connected by pipelines. The method comprises the following steps: allowing leather-making process waste water to orderly pass through the filter tank and the primary sedimentation tank, then introducing the waste water into the temperature adjusting tank, adjusting the temperature to 17-30 DEG C, and mixing with pickling process waste water added with iron filings and sodium silicate; introducing themixed waste water into the coagulation sedimentation tank, adding CaO, adjusting the pH to 8-9, removing sediments; introducing the supernatant overflowed from the coagulation sedimentation tank intothe flotation tank, removing suspensions; then orderly introducing the waste water into the acidifying hydrolyzing tank and the aerobic tank, removing residual organic matter; finally introducing thewaste water into the secondary sedimentation tank. The method of the invention can simultaneously treat two kinds of waste water; the resources consumed have low cost, and less using amounts; the operation cost is low; the equipment investment is less; and the method is applicable to large-scope popularization.
Description
Technical field
The present invention relates to water and pollute processing technology field, relate in particular to the system and method for a kind of comprehensive treating process acid cleaning process waste water and leather-making technology waste water.
Background technology
Iron And Steel Industry water consumption and the wastewater flow rate that produces are very big, and every experienced 1t steel approximately needs 200～250m
3Water.Steel rolling mainly comprises hot rolling and cold rolling two kinds of technologies, and the sewage quality that they produce is very different: wherein the cold rolling wastewater pollutant kind is various, and composition is also very complicated, mainly contains Cr
6+, Cr
3+With materials such as metallic iron, nickel.Because Cr
6+Have very strong toxicity, it must be reduced into Cr
3+The generation precipitation of hydroxide is removed.And being mainly the surface of rolling mill roll roller-way and steel, the pollution substance in the hot-rolling wastewater sprays a large amount of iron scales of bringing in the process of cooling, each oiling point contains the oils material, the oil pollutant that the oil pipe explosion causes in system's leakage of oil, oil impregnate and the production process and other solid impurities.
The steel industry pickling waste waters is handled technologies such as mainly comprising chemical precipitation method, spray roasting recovery salt acid system and fluidized bed process both at home and abroad at present, wherein chemical precipitation method is the present domestic main method that adopts, its disadvantage is that sludge quantity is big, the sludge dewatering difficulty, cause secondary pollution easily, and be difficult to recycle.Salt acid system and the recyclable reconstituted product that obtains of fluidized bed process are reclaimed in roasting, but year treatment capacity is when up to ten thousand tons of scales, on its new construction and the equipment addition investment huge, the construction period is longer.Also there are same problem in vacuum concentration method and nano-film filtration method.
The method that the combined sewage of tannery is handled is of a great variety, in the strict place of wastewater discharge standard control, its technology is earlier will to carry out combination treatment again after all kinds of sewage (waste liquids such as degreasing, depilation liming, the tannin) individual curing, but capital cost height often, processing cost is big.
Summary of the invention
The invention provides the system of a kind of comprehensive treating process acid cleaning process waste water and leather-making technology waste water, this system can handle two kinds of waste water simultaneously, and investment and running cost are low.
The system of a kind of comprehensive treating process acid cleaning process waste water and leather-making technology waste water comprises successively filtering basin, primary sedimentation basin, temperature regulation pond, coagulative precipitation tank, air flotation pool, acidification hydrolization pond, Aerobic Pond and secondary sedimentation basins by pipe connection.
Described coagulative precipitation tank is provided with overflow device, and the coagulative precipitation tank bottom is provided with agitator.
A kind of method of utilizing said system comprehensive treating process acid cleaning process waste water and leather-making technology waste water comprises:
Leather-making technology waste water successively by filtering basin and primary sedimentation basin, is removed solid matter, feed the temperature regulation pond then, adjust the temperature to after 17～30 ℃ and mix with the acid cleaning process waste water that adds iron filings and water glass, obtain composite waste; Composite waste is fed coagulative precipitation tank, add CaO and regulate pH value to 8～9, remove the precipitation of generation; To feed air flotation pool from the waste water supernatant that coagulative precipitation tank overflows, remove suspended substance; Then successively by acidification hydrolization pond and Aerobic Pond, remove residual organic; Feed secondary sedimentation basins at last and carry out secondary settlement.
Leather-making technology waste water is mainly derived from the preceding preparation of tanning, tanning and other wet workshop sections that processes.Polluting the most serious is degreasing waste water, liming hair removal wastewater, Chrome Tanning Wastewater, and these 3 kinds of waste water account for 50% of total wastewater flow rate, but have comprised most pollutents, i.e. 80% CODcr, 75% BOD
5, 70% Ss, 93% sulfide, 50% sodium-chlor and 95% chromium cpd.
Cold rolled sheet acid cleaning process waste water is the waste water behind the white finished sheet, and the content of each main component is approximately: Fe
2+/ Fe
3+1000～2000mg/L, CODcr 631mg/L, Ss 54mg/L, pH 2～3.
Owing to contain macrobead solid matters such as hair, scrap stock in the leather-making technology waste water, can remove by filtering basin and settling tank.The temperature of regulating leather-making technology waste water can adopt with spent hot water's (fuel-burning power plant waste water) mixes, and also can adopt the heating installation heating.
During processing, the mass ratio of described acid cleaning process waste water and described leather-making technology waste water is 1: 4～1: 10.Need add iron filings in acid cleaning process waste water, in acid cleaning process waste water per ton, dosage is preferably 200～280g.This mainly is for Fe in the mixed waste water
2+/ Fe
3+Concentration maintains about 200mg/L.Water glass is a kind of common flocculation agent, water-soluble formation jelly, and in acid cleaning process waste water per ton, its dosage is preferably 80～200g.The dosage of water glass considers that mainly the mol ratio of ferro element in element silicon and the waste water roughly maintains 25: 1.
Because the leather-making technology wastewater pH is 8～11, contains S
2-Deng negatively charged ion, and the acid cleaning process wastewater pH is 2～3, contains Fe
2+Deng metal ion, following reaction takes place during mixing:
H
++OH
-＝H
2O；S
2-+M
2+＝MS↓
Owing to added iron filings in the acid cleaning process waste water, had the material of strong oxidation capacity by iron filings and Fe
2+Reduction is reduced into trivalent chromic ion as hexavalent chromium, and generates Fe
3+Add CaO in the composite waste, the pH value reaches 8～9, and the mixed pH value of acid cleaning process waste water and leather-making technology waste water is approximately 2.7～7, and in composite waste per ton, it is 0.5～40g that adjusting composite waste pH to 8～9 approximately need the amount of CaO.OH in the composite waste
-Can react with metal ion, generate indissoluble thing or colloid thing:
Fe
2++2OH
-＝Fe(OH)
2↓；Fe
3++3OH
-＝Fe(OH)
3↓；Cr
3++3OH
-＝Cr(OH)
3↓
Jelly in the coagulative precipitation tank and the throw out of generation are settled down to the bottom, in the coagulative precipitation tank bottom whipping appts are set, and composite waste is stirred can improve reaction efficiency and coagulation efficiency, and stir speed (S.S.) is preferably 100～150r/min.
The composite waste that overflows from coagulative precipitation tank enters air flotation pool, and during processing, the surface load of waste water is 3.5～5.5m in the air flotation pool
3/ m
2H, upflow velocity are 1～1.2mm/s, and the residence time is 20～30min, can remove as suspended substances approaching with water-mass density such as greases.
Hydrolysis acidification pool comprises hydrolysis and two stages of acidifying, the purpose of hydrolysis is to change the non-solubility organism in the waste water into dissolved organic matter, the purpose of acidifying is the organism that the organism of soluble difficult for biological degradation in the waste water is changed into readily biodegradable, improve the biodegradability of waste water, be beneficial to follow-up aerobe and handle.
The COD major part of solubilised state is removed or is degraded into the low molecule organic matter of readily biodegradable in the waste water that acidication is handled.After entering Aerobic Pond, most ammonia-nitrogen and remainder COD are removed, and the supernatant liquor of Aerobic Pond is back to hydrolysis acidification pool simultaneously, and the denitrification denitrogenation reaction takes place, and the nitric nitrogen major part in the water body is removed.
The inventive method can be handled two kinds of waste water simultaneously, and the expensive source of institute is with low cost, consumption is few, and running cost is low, and facility investment is little, is conducive to promote on a large scale.
Description of drawings
Fig. 1 is the structural representation of system of the present invention.
Embodiment
As shown in Figure 1, a kind of Waste Water Treatment comprises filtering basin 1, primary sedimentation basin 2, equalizing tank 3, coagulative precipitation tank 4, air flotation pool 5, acidification hydrolization pond 6, Aerobic Pond 7 and secondary sedimentation basins 8.
In wherein being provided with in the filtering basin 1, fine fack each 2, a lattice job, lattice are standby, middle grid gap 40mm, the grid inclination angle is 60 °; Fine fack gap 10mm, the grid inclination angle is 50 °; Primary sedimentation basin 2 adopts horizontal flow type grit chamber, and the lattice number is 2 lattice, a lattice job, and lattice are standby.
Temperature regulation pond 3 is square, and feed-water end is equipped with one of diving mixer.In the catch pit in temperature regulation pond 3, install 2 and stir evenly submersible sewage pump, the using and the reserved automatically; Coagulative precipitation tank 4 comprises flat flow partition plate reaction tank and rectangular sedimentation tank; The partition plate reaction tank bottom is provided with agitator, and rectangular sedimentation tank lattice number is 2 lattice, a lattice job, and lattice are standby, and the rectangular sedimentation tank end is provided with V-notch weir, and through this device, sewage flows into air flotation pool 5.Air flotation pool 5 adopts the air-dissolving air-float pond; Hydrolysis acidification pool 6 is divided into 2 lattice, adopts the mode of bottom water inlet top water outlet, and Aerobic Pond 7 adopts the blast aeration mode, and radical sedimentation basin is adopted in secondary sedimentation 8 ponds, center water inlet, peripheral effluent.
Embodiment
The leather-making technology wastewater flow is 2000m
3During/d, open in the filtering basin 1 in, each one of fine fack, horizontal-flow grit chamber one lattice are opened one in the temperature regulation pond 3 and are stirred evenly submersible sewage pump automatically.Leather-making waste water is 0.9m/s by middle grid flow velocity, and the flow velocity by fine fack is 0.75m/s, feeds power plant effluent in temperature regulation pond 3, and the temperature of regulating leather-making technology waste water is 25 ℃.Before mixing, in the thin plate processing wastewater, add iron filings (1.6kg/d) and water glass (38.3kg/d), to guarantee Fe in the mixed waste water
2+/ Fe
3+Concentration is about 200mg/L, and sodium silicate silicate is about 20mg/L.
Earlier leather-making technology waste water and acid cleaning process waste water are mixed in the pipeline that feeds coagulative precipitation tank, composite waste each index of intaking is as shown in table 1, composite waste feeds coagulative precipitation tank 3, the stir speed (S.S.) of partition plate reaction tank bottom agitator is 100～150r/min, in the partition plate reaction tank bottom, add CaO simultaneously, regulate pH to 8～9 of composite waste.Scraping machine translational speed in the air flotation pool 4 is 3m/min, and surface load is 3.5～5.5m
3/ m
2H, upflow velocity are 1～1.2mm/s, and the residence time is 20～30min.Hydrolysis acidification pool 6 is divided into 2 lattice, adopts the mode of bottom water inlet top water outlet, upflow velocity 1.80m/s; Aerobic Pond 7 adopts blast aeration mode, return current ratio of the mixed liquid 0.5; Hydraulic detention time 2.5h in the secondary sedimentation basins 8, return sludge ratio 0.5, each index of the waste water after the processing is as shown in table 1.
Table 1
Claims (1)
1. the method for a comprehensive treating process acid cleaning process waste water and leather-making technology waste water, the system that utilizes comprises successively filtering basin, primary sedimentation basin, temperature regulation pond, coagulative precipitation tank, air flotation pool, acidification hydrolization pond, Aerobic Pond and the secondary sedimentation basins by pipe connection, described coagulative precipitation tank is provided with overflow device, and the bottom is provided with agitator;
Described method comprises:
Leather-making technology waste water successively by filtering basin and primary sedimentation basin, is removed solid matter, feed the temperature regulation pond then, adjust the temperature to after 17～30 ℃ and mix with the acid cleaning process waste water that adds iron filings and water glass, obtain composite waste; Composite waste is fed coagulative precipitation tank, add CaO and regulate pH value to 8～9, remove the precipitation of generation; To feed air flotation pool from the wastewater supernatant fluid that coagulative precipitation tank overflows, remove suspended substance; Then successively by acidification hydrolization pond and Aerobic Pond, remove residual organic; Feed secondary sedimentation basins at last and carry out secondary settlement;
The mass ratio of described acid cleaning process waste water and described leather-making technology waste water is 1:4～1:10;
In acid cleaning process waste water per ton, the dosage 200～280g of iron filings, the dosage of water glass are 80～200g;
The stirring velocity of described agitator is 100～150r/min;
During processing, the surface load of waste water is 3.5～5.5m in the described air flotation pool
3/ (m
2H), upflow velocity is 1～1.2mm/s, and the residence time is 20～30min.
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|---|---|---|---|
| CN 201110312106 CN102417275B (en) | 2011-10-14 | 2011-10-14 | System and method for comprehensive treatment of pickling process waste water and leather-making process waste water |
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|---|---|---|---|
| CN 201110312106 CN102417275B (en) | 2011-10-14 | 2011-10-14 | System and method for comprehensive treatment of pickling process waste water and leather-making process waste water |
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| CN102417275B true CN102417275B (en) | 2013-09-25 |
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| CN104250054B (en) * | 2013-06-28 | 2015-10-21 | 桐乡市高桥皮革有限责任公司 | A kind of leather-making waste water diversion processing method |
| CN112110563B (en) * | 2020-08-17 | 2023-07-25 | 江苏开放大学（江苏城市职业学院） | Method for treating sewage and sludge from chrome tanning |
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| CN101205091B (en) * | 2006-12-18 | 2010-09-29 | 张金华 | Coagulating agent for treatment of leather-making waste water and leather-making waste water treating method |
| CN101607780B (en) * | 2009-07-22 | 2013-01-02 | 顾利平 | Process for treating tar product wastewater |
| CN202297309U (en) * | 2011-10-14 | 2012-07-04 | 浙江富春江环保热电股份有限公司 | System for comprehensively treating wastewater generated in pickling process and tanning process |
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Non-Patent Citations (4)
| Title |
|---|
| "硫酸亚铁酸洗废液在制革废水处理中的应用";朱淑琴等;《中国环境科学》;19991231;第19卷(第2期);第180-182页 * |
| "钢管酸洗废液在制革综合污水处理中的应用";陈学群;《中国皮革》;20010731;第30卷(第13期);第20-22页 * |
| 朱淑琴等."硫酸亚铁酸洗废液在制革废水处理中的应用".《中国环境科学》.1999,第19卷(第2期),第180-182页. |
| 陈学群."钢管酸洗废液在制革综合污水处理中的应用".《中国皮革》.2001,第30卷(第13期),第20-22页. |
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