CN104176845B - A kind of process for reclaiming of cold rolling alkaline oily(waste)water - Google Patents
A kind of process for reclaiming of cold rolling alkaline oily(waste)water Download PDFInfo
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- CN104176845B CN104176845B CN201310188243.8A CN201310188243A CN104176845B CN 104176845 B CN104176845 B CN 104176845B CN 201310188243 A CN201310188243 A CN 201310188243A CN 104176845 B CN104176845 B CN 104176845B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a kind of process for reclaiming of cold rolling alkaline oily(waste)water, in turn include the following steps: (1) pH aerating regulation: cold rolling alkaline oily(waste)water enters pH regulator aeration tank, adjust ph 4.0 ~ 9.0; (2) cool: wastewater temperature is down to 18 ~ 35 ° of C; (3) scum filter tank: the waste water after cooling enters scum filter tank, adds scum and carbon granule to scum filter tank; (4) chemical coagulation and precipitation: the water outlet in scum filter tank enters chemical coagulation and precipitation pond, adds coagulating agent and flocculation agent; (5) multilayer adsorption filtration; (6) desalting treatment: enter reverse osmosis desalination treatment system, carries out desalting treatment.The method promotes the service efficiency of trade effluent, reduces the quantity discharged of ton steel waste water, both cold rolling alkaline oily(waste)waters of recycle, additionally reduce the consumption of new water, reduce environmental pollution, there is economy and environmental protection double effects, there is good social benefit and environmental benefit.
Description
Technical field
The invention belongs to water-treatment technology field, be specifically related to a kind of degree of depth process for reclaiming of cold rolling alkaline oily(waste)water.
Background technology
Iron And Steel Industry is the industry of a high energy consumption, high resource, high pollution, and its water resources consumption is huge, accounts for 14% of national industrial water consumption.In July, 2005, National Development and Reform Committee put into effect " steel industry development policies ", to development of iron & steel industry recycling economy, save energy and resource, walk sustainable development path and propose higher target and requirement more specifically, when global resources are in short supply, less energy-consumption, low stain, low emission become the needs of social development.
The unit water consumption of Iron and Steel Enterprises in China is still higher than the level of external advanced iron and steel enterprise, a nearly step-down low iron and steel enterprise ton steel consumes the new water yield, improve the cyclic utilization rate of iron and steel enterprise's water, the comprehensive treatment & reuse strengthening iron and steel enterprise's waste water is one of Iron and Steel Enterprises in China key realizing Sustainable development.
Iron and steel enterprise can produce a large amount of oily(waste)waters in rolling process.Mainly contain emulsified oil-containing waste water that Cooling and Lubricator in belt steel rolling process produces and the oily(waste)water that cooling zone steel produces in degreasing before annealing.In addition, also all there is the problem of emulsifying liquid waste water discharge in hot rolling and silicon sheet plant.
Oily wastewater treatment method is divided into Physical, chemical method, physico-chemical processes and biological process etc. by handling principle.Physical is gravitational separation process and membrane separation process etc. mainly.Gravitational separation process is the technology utilizing density difference to carry out oily water separation, by all kinds of oil-isolating device to remove oil slick in water and solid attaching oil.Membrane separation process mainly contains micro-filtration (MF), nanofiltration (NF), ultrafiltration (UF) and reverse osmosis (RO) method, is suitable for removing oil in water emulsion and dispersed oil.The main drawback of membrane separation process is film not easy cleaning, easily contaminated etc.Physico-chemical processes is By Bubble-floating Method, chemical flocculation, absorption method, magnetic separation method etc. mainly.By Bubble-floating Method in water, passes into air produce micro bubble, tiny suspension oil droplet is attached to and bubble also floats to the water surface together and realizes being separated.Flocculence is by adding suitable flocculation agent in oily(waste)water, through absorption, build bridge, neutralization and the effect such as embedding form floss and except the oil contaminants in anhydrating.Absorption method is dispersed oil, oil in water emulsion and dissolving oil in the selective material planar water utilizing specific surface area large.Magnetic separation method often combines with Coagulation Method process oily(waste)water.Magnetic separation method remains in back flushing difficulty and the operational condition problem such as not clearly.Chemical method is advanced oxidation processes and electrochemical process mainly.The larger molecular organics (comprising oils) of difficult degradation in waste water, also known as advanced oxidation processes, by bringing out the hydroxyl radical free radical producing and have strong oxidizing property, is oxidized to low toxicity or nontoxic small molecules by high-level oxidation technology.Electrochemical process makes the method for anode electrolysis process oily(waste)water, is mainly applicable to the second-stage treatment of cooling-lubricant in Mechanical Processing Industry.Biological treatment is also the method effectively removing COD in oily(waste)water.Oily(waste)water is after the process such as oil removal, flotation, and water outlet oil-contg is general still up to 20 ~ 30mg/L, does not reach the emission standard of national regulation, still needs and carry out advanced treatment.
Cold rolling alkaline oily(waste)water is mainly between milling train unit, grinding roller and the oil depot draining of each units such as band steel degreasing unit.Cold rolling alkaline oily(waste)water after conventional processing can barely meet the environment protection emission requirement of national regulation.
The open a kind of alkali that contains of Chinese patent " a kind of containing alkali process for treating oil-containing waste water " (CN101684025A) contains waste water treatment process.This technological process first carries out neutralizing treatment by containing alkali oily(waste)water, then successively by sloping plate deposition, paper tape filtering, uf processing, finally carries out the process of discharging.This technology is just a kind of contains waste water treatment process containing alkali, does not consider containing alkali oily(waste)water comprehensive reutilization and advanced treatment.Chinese patent " the anaerobic-aerobic combined biological treatment method of oily wastewater of cold rolling mill " (CN101481195A) the invention discloses a kind of anaerobic-aerobic combined biological treatment method of oily wastewater of cold rolling mill, aerobic treatment is carried out again after anaerobic treatment is carried out to oily(waste)water, strict control parameters, after making second-stage treatment, cold rolling alkaline oily waste water oil-in-water and COD concentration reach the first discharge standard of " integrated wastewater discharge standard " (GB8978 – 1996), easy and simple to handle, stable, biodegradability is good, running cost is low.This technology adopts biotechnology to make water-quality guideline in cold rolling oil-containing waste water reach " integrated wastewater discharge standard " first discharge standard, the further treatment technique of consideration oily(waste)water useless.Chinese patent " a kind for the treatment of process of dilute emulsified oily watewater " (CN101684025A) discloses a kind for the treatment of process of dilute emulsified oily watewater.Dilute emulsified oily watewater is after all refluxing with aerating regulation, one-level pH adjustment, secondary pH adjustment, coagulation, air supporting, cooling, bio-contact oxidation, flocculation sediment, partial sludge, and standard water discharge is discharged or reuse.This technology is dilute emulsified oily watewater qualified discharge technology, does not relate to the technical scheme that oily(waste)water recycle returns production.
Ripe cold rolling alkaline process for treating oil-containing waste water be there is no both at home and abroad for this type of waste water, the present invention proposes the reusing process system of cold rolling alkaline oily(waste)water, achieve the green process of cold rolling alkaline oily(waste)water, saved Iron and Steel Production water, reduce a ton steel and consume the new water yield.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of process for reclaiming of cold rolling alkaline oily(waste)water, realize the object of utilization of wastewater resource, promote the service efficiency of trade effluent, reduce the quantity discharged of ton steel waste water, both the cold rolling alkaline oily(waste)water of recycle, additionally reduced the consumption of new water; Based on recycle and energy-saving and emission-reduction, reduce environmental pollution, there is economy and environmental protection double effects, there is good social benefit and environmental benefit.
Technical solution of the present invention is as follows:
The process for reclaiming of a kind of cold rolling alkaline oily(waste)water provided by the invention, in turn includes the following steps:
(1) pH aerating regulation: cold rolling alkaline oily(waste)water enters pH regulator aeration tank, adds acid in pH regulator aeration tank, regulates alkaline oily(waste)water pH value 4.0 ~ 9.0;
(2) cool: the cold rolling alkaline oily(waste)water temperature through step (1) pH regulator is down to 18 ~ 35 ° of C;
(3) scum filter tank: the cold rolling alkaline oily(waste)water after step (2) cooling enters scum filter tank, adds scum and carbon granule to scum filter tank; The described weight ratio adding scum and carbon granule is: scum: carbon granule=1:0.03 ~ 0.3;
(4) chemical coagulation and precipitation: enter chemical coagulation and precipitation pond from the water outlet in step (3) scum filter tank, coagulating agent and flocculation agent is added to chemical coagulation and precipitation pond, described coagulant charging quantity is 5mg/l ~ 200mg/l, and described flocculant dosage is 0.2mg/l ~ 2.5mg/l;
(5) multilayer adsorption filtration: the wastewater supernatant fluid through step (4) chemical coagulation and precipitation process enters multilayer absorption filtering pool; The filter material layer of described absorption filtering pool is followed successively by quartz sand layer, grain slag layer, Flyash Layer, calcium base bentone soil layer and active carbon layer;
(6) desalting treatment: the water outlet through step (5) multilayer adsorption filtration process enters reverse osmosis desalination treatment system, carries out desalting treatment.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, after described step (6) desalting treatment, the water quality of cold rolling alkaline oily(waste)water is: pH is 6 ~ 9, COD is 2 ~ 10mg/l, oil is lower than 0.03mg/l, and suspended substance is 0 ~ 2mg/l, and specific conductivity is lower than 50 μ s/cm, chlorion is 2 ~ 30mg/l, and water temperature is 18 ~ 35 ° of C.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, one or more of sulfuric acid, hydrochloric acid or nitric acid are selected from the acid of described step (1).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, one or more of industrial waste sulfuric acid, waste hydrochloric acid or waste nitric acid are selected from the acid of described step (1).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, microporous aeration device is equipped with in the bottom of described pH regulator aeration tank, and aeration intensity is 0.1 ~ 5m
3(air)/m
3(waste water).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, the industrial waste acid of interpolation is content is 30% ~ 80% Waste Sulfuric Acid.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, the time that waste water stops in pH regulator aeration tank in described step (1) is 3 ~ 15min.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, the time that waste water stops in pH regulator aeration tank in described step (1) is 6 ~ 13min.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, described step (2) cools with plate-type heat exchanger, and the recirculated cooling water of described plate-type heat exchanger is process water.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, the weight ratio adding scum and carbon granule described in is: scum: carbon granule=1:0.1 ~ 0.3;
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, the scum of described step (3) is selected from blast furnace scum, cast iron scum, one or more of scum that mechanical workout produces.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, described scum particle diameter 2.0 ~ 10.0mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, described scum needs within 20 minutes, to remove surperficial oil stain with 5% ~ 20% alkali lye in 90 degree of lower immersions, then soaks removal oxide on surface with the hydrochloric acid soln of 5% ~ 15%, cleaner with tap water.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, described step (3) carbon granule is selected from one or more in coke, gac, cinder, flue dust, hard coal.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, the particle diameter of described carbon granule is 0.3 ~ 6.0mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, the particle diameter of described carbon granule is 3.0 ~ 5.0mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, the filler bottom described scum filter tank is porous, inorganic inert media, and it is 10% ~ 50% that described porous, inorganic inert media accounts for filtrate volume ratio.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, the filler bottom described scum filter tank is porous, inorganic inert media, and it is 20% ~ 30% that described porous, inorganic inert media accounts for filtrate volume ratio.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, entering scum filter tank waste water described in is 30 ~ 120min in the residence time in scum filter tank.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, entering scum filter tank waste water described in is 65 ~ 100min in the residence time in scum filter tank.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, the coagulating agent of described step (4) is selected from iron trichloride, one or more of aluminum chloride, Tai-Ace S 150, polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, described flocculation agent is selected from that anionic polyacrylamide, polypropylene are fine, sodium polyacrylate, calcium polyacrylate (CPA), one or more of gelatin.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, described coagulant charging quantity is 150mg/l ~ 200mg/l.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, described flocculant dosage is 0.5mg/l ~ 1.0mg/l.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (4), cold rolling alkaline oily(waste)water hydraulic detention time is 8 ~ 20min.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (4), cold rolling alkaline oily(waste)water hydraulic detention time is 10 ~ 16min.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (4), cold rolling alkaline oily(waste)water flow velocity is 0.2m/s ~ 0.8m/s.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (4), cold rolling alkaline oily(waste)water flow velocity is 0.6m/s ~ 0.8m/s.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (4), cold rolling alkaline oily(waste)water flap angle is 102.5-105 degree.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in the filter material layer of described step (5), quartz sand accounts for the volume ratio of total filtrate is 2% ~ 12%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in the filter material layer of described step (5), quartz sand accounts for the volume ratio of total filtrate is 5% ~ 10%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in the filter material layer of described step (5), grain slag accounts for the volume ratio of total filtrate is 5% ~ 17%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in the filter material layer of described step (5), grain slag accounts for the volume ratio of total filtrate is 10% ~ 15%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in the filter material layer of described step (5), flyash accounts for the volume ratio of total filtrate is 10 ~ 30%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in the filter material layer of described step (5), flyash accounts for the volume ratio of total filtrate is 20 ~ 30%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in the filter material layer of described step (5), calcium base modified alta-mud accounts for the volume ratio of total filtrate is 15% ~ 45%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in the filter material layer of described step (5), calcium base modified alta-mud accounts for the volume ratio of total filtrate is 25% ~ 30%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in the filter material layer of described step (5), gac accounts for the volume ratio of total filtrate is 20 ~ 50%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in the filter material layer of described step (5), gac accounts for the volume ratio of total filtrate is 30 ~ 35%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), the flow velocity of cold rolling alkaline oily(waste)water in multilayer absorption filtering pool is 5m/h ~ 15m/h.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), the flow velocity of cold rolling alkaline oily(waste)water in multilayer absorption filtering pool is 10m/h ~ 12m/h.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), the back flushing rate of expansion of cold rolling alkaline oily(waste)water in multilayer absorption filtering pool is 50% ~ 100%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), the back flushing rate of expansion of cold rolling alkaline oily(waste)water in multilayer absorption filtering pool is 75% ~ 80%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), the backwashing period of cold rolling alkaline oily(waste)water in multilayer absorption filtering pool is 36h ~ 96h.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), the backwashing period of cold rolling alkaline oily(waste)water in multilayer absorption filtering pool is 48h ~ 72h.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), the particle diameter of quartz sand is 0.8 ~ 7.0mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), the particle diameter of quartz sand is 2.8 ~ 4.0mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in the uniformity coefficient 90% ~ 98% of the middle quartz sand of described step (5).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in the uniformity coefficient 95% ~ 96% of the middle quartz sand of described step (5).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, at the SiO of the middle quartz sand of described step (5)
2content 98.3% ~ 99.5%, Fe
2o
3content is lower than 0.2%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, at the SiO of the middle quartz sand of described step (5)
2content 99.2% ~ 99.5%, Fe
2o
3content is lower than 0.2%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, the grain slag chemical composition in grain slag layer described in described step (5) is mainly CaO:32 ~ 45%; SiO
2: 22 ~ 41%; Al
2o
3: 5 ~ 15%; MgO:2 ~ 15%; FeO:0.5 ~ 1.0%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, the grain slag chemical composition in grain slag layer described in described step (5) is mainly CaO:41 ~ 42%; SiO
2: 25 ~ 35%; Al
2o
3: 10 ~ 12%; MgO:9 ~ 12%; FeO:0.7 ~ 1.0%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in grain slag layer described in described step (5), the particle diameter of grain slag is 0.5 ~ 12.0mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in grain slag layer described in described step (5), the particle diameter of grain slag is 1.5 ~ 3.5mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in grain slag layer described in described step (5), uniformity coefficient is 85% ~ 98%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in grain slag layer described in described step (5), uniformity coefficient is 95% ~ 96%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, the chemical composition mainly SiO of flyash described in described step (5)
2: 45.2% ~ 59.6%; Al
2o
3: 18.6% ~ 35.6%; Fe
2o
3: 3.5 ~ 15.6%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, the chemical composition mainly SiO of flyash described in described step (5)
2: 52.6% ~ 53.8%; Al
2o
3: 28.6% ~ 30.2%; Fe
2o
3: 10.8 ~ 13.7%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), the particle diameter of flyash is 0.5 ~ 9.0mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), the particle diameter of flyash is 2.5 ~ 2.8mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), the uniformity coefficient of flyash is 90% ~ 98%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), the uniformity coefficient of flyash is 95% ~ 98%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), calcium base modified alta-mud particle diameter is 1.2 ~ 15.0mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), calcium base modified alta-mud particle diameter is 2.0 ~ 2.1mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), calcium base modified alta-mud water-intake rate is 50% ~ 350%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), calcium base modified alta-mud water-intake rate is 150% ~ 200%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), calcium base modified alta-mud gum level is 2 ~ 15ml/g.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), calcium base modified alta-mud gum level is 8 ~ 10ml/g.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), calcium base modified alta-mud expansion volume is 5 ~ 25%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), calcium base modified alta-mud expansion volume is 15 ~ 20%.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, calcium base modified alta-mud Absorbance ratio-derivative method 0.1 ~ 0.6g/g in described step (5).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, calcium base modified alta-mud Absorbance ratio-derivative method 0.4 ~ 0.5g/g in described step (5).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (5), calcium base modified alta-mud cation exchange capacity is 0.3 ~ 1.2mmol/g.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, in described step (5), calcium base modified alta-mud cation exchange capacity is 0.8 ~ 0.9mmol/g.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, calcium base modified alta-mud wet compressive strengths 10 ~ 35kPa in described step (5).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, calcium base modified alta-mud wet compressive strengths 25 ~ 30kPa in described step (5).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, calcium base modified alta-mud hot green tensile strength 0.3 ~ 1.4kPa in described step (5).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, calcium base modified alta-mud hot green tensile strength 0.7 ~ 1.0kPa in described step (5).
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, described in described step (5), the particle diameter of gac is 0.3 ~ 5.0mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, described in described step (5), the particle diameter of gac is 1.5 ~ 3.2mm.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, described in described step (5), the specific surface area of gac is 800 ~ 5000m
2/ g, surface density is 370 ~ 580g/l, and Absorbance ratio-derivative method is 0.1 ~ 1.3g/g.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, described in described step (5), the specific surface area of gac is 2000 ~ 3200m
2/ g, surface density is 450 ~ 480g/l, and Absorbance ratio-derivative method is 0.8 ~ 1.0g/g.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, in described step (6), reverse osmosis desalination treatment system forms primarily of reverse osmosis unit, chemical cleaning system and auxiliary dosing regeneration system rapidly; Described reverse osmosis unit is formed by combining primarily of reverse osmosis membrane assembly, pressurized vessel, high-pressure pump, reverse osmosis balladeur train, control instruments and related pressure pipeline; Described chemical cleaning system is formed by combining primarily of matting water tank, water pump, cleaning cartridge filter; Described auxiliary dosing regeneration system rapidly combines mutually primarily of flocculation dosing, reduction dosing, scale inhibition dosing etc.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, preferably, desalting treatment system desalination rate 85.5 ~ 99.8% in described step (6), average flux is 11.8 ~ 16.6L/m
2.h, pressure is 1.2 ~ 3.8MPa, obtains water rate 65% ~ 78%, and operating temperature is 20 ~ 30 degree.
According to the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, further preferably, desalting treatment system desalination rate 99.5 ~ 99.6% in described step (6), average flux is 10 ~ 12L/m
2.h, pressure is 2.7 ~ 3.8MPa, obtains water rate 73% ~ 75%, and operating temperature is 25 ~ 30 degree.
Detailed Description Of The Invention
The invention provides cold rolling alkaline oily(waste)water recycling processing technique scheme, system solves the problem of cold rolling discharge alkaline wastewater contaminate environment, after the technical program process, cold rolling alkaline waste water reaches standards for industrial water usage, can be applied to the production system of steel industry view.Cold rolling alkaline oil-containing reuse treatment process of the present invention, treatment effect is stablized, and production run cost is low, and operation runs easy, and level of automation is high.
The present invention's former water before treatment is the bio-chemical effluent of cold rolling alkaline oily(waste)water, raw water quality: pH is 8 ~ 12, COD is 60 ~ 150mg/l, oil is 2 ~ 15mg/l, suspended substance is 10 ~ 150mg/l, specific conductivity is 1500 ~ 6000 μ s/cm, and chlorion is 850 ~ 1550mg/l, and water temperature is 37 ~ 51 degree.After the process for reclaiming process of the cold rolling alkaline oily(waste)water provided, the water quality of cold rolling alkaline oily(waste)water is: pH is 6 ~ 9, COD is 2 ~ 10mg/l, oil is lower than 0.03mg/l, suspended substance is 0 ~ 2mg/l, specific conductivity is lower than 50 μ s/cm, and chlorion is 2 ~ 30mg/l, and water temperature is 18 ~ 35 degree.Effluent quality reaches standards for industrial water usage, again can be back to production system.
Technical scheme of the present invention is as follows:
(1) PH aerating regulation pond
The former water of cold rolling alkaline oily(waste)water enters PH and regulates aeration tank, and the one adding industrial waste sulfuric acid, waste hydrochloric acid or waste nitric acid in PH equalizing tank regulates alkaline oily(waste)water.PH is housed in equalizing tank and takes into account robot control system(RCS), pH value controls 4.0 ~ 9.0, is regulated the dosage of spent acid by control PH robot control system(RCS).Microporous aeration device is equipped with in the bottom of reaction tank, and aeration intensity is 0.1 ~ 5m
3(air)/m
3(waste water).Oil skimmer vessel is equipped with on equalizing tank upper strata, irregularly removes the oil slick of the water surface.The time that waste water stops in equalizing tank is 3 ~ 15min.
In the industrial waste acid of interpolation of the present invention, preferred content is 30% ~ 80% Waste Sulfuric Acid.
(2) plate-type heat exchanger
Cold rolling alkaline oily(waste)water temperature behind PH aerating regulation pond is between 37 ~ 51 degree, and waste water water temperature over-high can affect subsequent disposal operation, and therefore need interchanger to reduce the water temperature of waste water, output water temperature controls between 18 ~ 35 degree.The recirculated cooling water of plate-type heat exchanger is process water.
(3) scum filter tank
Scum filter tank is entered after cold rolling alkaline oily(waste)water reduces temperature in interchanger.Scum filter tank is a kind of device fully utilizing redoxomorphism and Electrochemical adsorption.
Using scum and carbon granule as electrode materials, when material is immersed in cold rolling alkaline oily(waste)water, because iron and carbon granule exist obvious redox-potential, scum and carbon granule define many small galvanic cells, at iron carbon surface, electric current flows in thousands of individual tiny microbattery.Its electrode reaction is:
Anode: Fe-2e=Fe2+E0 (Fe2+/Fe)=0.44V
Negative electrode: 2H+-2e=H2E0 (H+/H2)=0.00V
The H+ etc. that electrode reaction generates has very high activity, with various ingredients generation redox reaction in cold rolling alkaline oily(waste)water, can remove the organism in waste water.Meanwhile, metallic iron can come iron with metal activity series in waste water after heavy metal ion generation replacement(metathesis)reaction; Secondly, containing a large amount of Fe in the waste water after Fe-C micro electrolysis process, then generate the extremely strong Fe of flocculence (OH) by after neutral for waste water modulation and aeration
3, effectively can adsorb the suspended substance in waste water and heavy metal ion.
Scum of the present invention is selected from the blast furnace scum in Iron and Steel Production, cast iron scum, the scum etc. in mechanical workout production.Through screening, select the scum of 2.0 ~ 10.0mm.Scum needs within 20 minutes, to remove surperficial oil stain with 5% ~ 20% alkali lye in 90 degree of lower immersions, then soaks removal oxide on surface with the hydrochloric acid soln of 5% ~ 15%, cleaner with tap water.Described carbon granule is one and the combination thereof of coke, gac, cinder, flue dust, hard coal etc.Particle diameter is selected to be the carbon granule of 0.3 ~ 6.0mm.Described scum filter tank, the weight ratio of scum and carbon granule is: scum: carbon granule=1:0.03 ~ 0.3.Filler bottom described scum filter tank is porous, inorganic inert media, and accounting for filtrate volume ratio is 10% ~ 50%.
The present invention is further, and the residence time in scum filter tank is 30 ~ 120min.
(4) chemical coagulation and precipitation pond
The water outlet of scum filter tank enters the further organics removal in chemical coagulation and precipitation pond and suspended substance.
Chemical coagulation process is in waste water, drop into coagulating agent and flocculation agent, because coagulating agent is ionogen, in waste water, forms micelle, with the colloidalmaterial generation charge neutrality in waste water, forms floc particle sedimentation.Coagulating sedimentation not only can remove the tiny suspended particle in waste water, but also can remove colourity, oil content, microorganism, heavy metal and organism etc.The coagulating agent that the present invention adopts is iron trichloride, aluminum chloride (AlCl
36H
2o), Tai-Ace S 150 (Al
2(SO)
318H
2o), polymerize aluminum chloride (PAC), polyaluminium sulfate (PAS), poly-ferric chloride (PFC), bodied ferric sulfate (PFS) one or more are composite, dosage is 5mg/l ~ 200mg/l.Adding flocculation agent is that anionic polyacrylamide, polypropylene are fine, sodium polyacrylate, calcium polyacrylate (CPA), and the one of gelatin, dosage is 0.2mg/l ~ 2.5mg/l.
Coagulating agent and flocculation agent add in waste water by tubular type diffusion mixer, hyperchannel flap coagulation basin is entered after medicament and the cold rolling alkaline oily(waste)water mixing of alkalescence, hydraulic detention time is 8 ~ 20min, and flow velocity is 0.2m/s ~ 0.8m/s, and flap angle is 102.5 degree.Then cold rolling alkaline oily(waste)water enters sloping plate deposition region.Sloping plate deposition utilizes shallow pool principle, and suspension is within the residence time of swash plate region, and sloping plate deposition sections bottom has bucket, and bucket has the gradient of 0.02 ~ 0.03, and is provided with the shore pipe that diameter is 200mm, the mud periodic cleaning of discharge and outward transport.
(5) multilayer absorption filtering pool
The wastewater supernatant fluid in chemical precipitation pond enters multilayer absorption filtering pool by force (forcing) pump.
Multilayer absorption filtering pool, by the retaining of multimedium filtrate, sedimentation and adsorption, the efficient superfine powder particle removed in cold rolling alkaline oily(waste)water, the organism in Adsorption waste water.Filtrate in absorption filtering pool in the present invention divides multilayer, is quartz sand layer, grain slag layer, Flyash Layer, calcium base modified alta-mud and gac respectively
In filter material layer of the present invention preferably: the volume ratio accounting for filtrate of quartz sand is 2% ~ 12%, and grain slag is 5% ~ 17%, and flyash is 10 ~ 30%, calcium base modified alta-mud is 15% ~ 45%, and gac is 20 ~ 50%.
The flow velocity of cold rolling alkaline oily(waste)water of the present invention in multilayer adsorption filter is 5m/h ~ 15m/h, and back flushing rate of expansion is 50% ~ 100%, backwashing period 36h ~ 96h.
Quartz sand of the present invention is a kind of silicate minerals of hard, wear-resisting, stable chemical performance, and its main mineral constituent is SiO
2, the chemistry of quartz sand, calorifics and mechanical property have obvious anisotropy, are insoluble to acid, are slightly soluble in KOH solution, fusing point 1750 degree.
Quartz sand of the present invention preferably particle diameter is 0.8 ~ 7.0mm, uniformity coefficient 90% ~ 98%, SiO
2content 98.3% ~ 99.5%, Fe
2o
3content is lower than 0.2%.
The slag of melting out in blast furnace when the grain slag in grain slag layer of the present invention is blast furnace ironmaking, by the granular solids residue produced after shrend.
Grain slag of the present invention preferably chemical composition is mainly CaO:32 ~ 45%; SiO
2: 22 ~ 41%; Al
2o
3: 5 ~ 15%; MgO:2 ~ 15%; FeO:0.5 ~ 1.0%.The particle diameter of grain slag is 0.5 ~ 12.0mm, and uniformity coefficient is 85% ~ 98%.
Flyash of the present invention, from power plant for self-supply of steel mill, has that cellular structure, specific surface area are comparatively large, surface energy is high, and surface also exists the materials such as much aluminium, silicon, has stronger adsorptive power.A13+, Fe3+ contained by flyash have throwing out, can form adsorption-flocculation precipitation synergy.
The present invention preferably, the chemical constitution mainly SiO of flyash
2: 45.2% ~ 59.6%; Al
2o
3: 18.6% ~ 35.6%; Fe
2o
3: 3.5 ~ 15.6%.The particle diameter of flyash is 0.5 ~ 9.0mm, and uniformity coefficient is 90% ~ 98%.
The interlamellar spacing of calcium base modified alta-mud of the present invention is large, and interlayer becomes hydrophobicity from wetting ability, and in planar water, the former scholar of organic energy force rate improve tens to hundred times.Due to special nanostructure effect, calcium base modified alta-mud have structure function adjustable, can efficient organics removal and oily substance, can repeatedly use, the advantage such as saturated adsorption capacity is large.
The present invention preferably, described calcium base modified alta-mud particle diameter is 1.2 ~ 15.0mm, water-intake rate is 50% ~ 350%, gum level is 2 ~ 15ml/g, expansion volume is 5 ~ 25%, Absorbance ratio-derivative method 0.1 ~ 0.6g/g, and cation exchange capacity is 0.3 ~ 1.2mmol/g, wet compressive strengths 10 ~ 35kPa, hot green tensile strength 0.3 ~ 1.4kPa.
Gac of the present invention is with the multiple black porous particle originally made through carbonization and activation treatment such as bituminous coal, hard coal, shell or wood chip.Gac has huge specific surface area, very big with the contact surface of water, and thus sorptive power is very strong.Utilize organic pollutant, oils and the residual heavy metal component in the cold rolling alkaline oily(waste)water of the adsorption of gac removal.
Preferably, the particle diameter of described gac is 0.3 ~ 5.0mm, and specific surface area is 800 ~ 5000m2/g, and surface density is 370 ~ 580g/l, and Absorbance ratio-derivative method is 0.1 ~ 1.3g/g in the present invention.
(6) desalting treatment system
The water outlet of multilayer absorption filtering pool enters reverse osmosis desalination treatment system.
Reverse osmosis desalination treatment system forms primarily of reverse osmosis unit, chemical cleaning system and auxiliary dosing regeneration system rapidly.Reverse osmosis unit is formed by combining primarily of reverse osmosis membrane assembly, pressurized vessel, high-pressure pump, reverse osmosis balladeur train, control instruments and related pressure pipeline.Chemical cleaning system is formed by combining primarily of matting water tank, water pump, cleaning cartridge filter.Auxiliary dosing regeneration system rapidly combines mutually primarily of flocculation dosing, reduction dosing, scale inhibition dosing etc.
Preferably, desalting treatment system desalination rate 85.5 ~ 99.8%, average flux is 11.8 ~ 16.6L/m2.h, and pressure is 1.2 ~ 3.8MPa, obtains water rate 65% ~ 78%, and operating temperature is 20 ~ 30 degree in the present invention.
After desalting treatment system, the water quality of cold rolling alkaline oily(waste)water is: pH is 6 ~ 9, COD is 2 ~ 10mg/l, and oil is lower than 0.03mg/l, and suspended substance is 0 ~ 2mg/l, and specific conductivity is lower than 50 μ s/cm, and chlorion is 2 ~ 30mg/l, and water temperature is 18 ~ 35 degree.Effluent quality reaches standards for industrial water usage, again can be back to production system.
Cold rolling alkaline oil-containing recycling processing system of the present invention, treatment effect is stablized, and production run cost is low, and operation runs easy, and level of automation is high.Therefore the invention belongs to environmentally friendly iron and steel green production system.
Advantageous Effects of the present invention:
The process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, realize the object of utilization of wastewater resource, promote the service efficiency of trade effluent, reduce the quantity discharged of ton steel waste water, both the cold rolling alkaline oily(waste)water of recycle, additionally reduced the consumption of new water.Based on recycle and energy-saving and emission-reduction, reduce environmental pollution, there is economy and environmental protection double effects, there is good social benefit and environmental benefit.
The process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, after process, the water quality of cold rolling alkaline oily(waste)water is: pH is 6 ~ 9, COD is 2 ~ 10mg/l, oil is lower than 0.03mg/l, suspended substance is 0 ~ 2mg/l, specific conductivity is lower than 50 μ s/cm, and chlorion is 2 ~ 30mg/l, and water temperature is 18 ~ 35 degree.Effluent quality reaches standards for industrial water usage, again can be back to production system.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention;
Embodiment
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.
Embodiment 1
A process for reclaiming for cold rolling alkaline oily(waste)water, step is as follows:
(1) bio-chemical effluent (former water) of cold rolling alkaline oily(waste)water enters PH aerating regulation pond.Raw water quality: pH is 12, COD is 150mg/l, and oil is 15mg/l, and suspended substance is 136mg/l, and specific conductivity is 5899 μ s/cm, and chlorion is 1220mg/l, and water temperature is 50 degree.Add the dense Waste Sulfuric Acid of 80% in pH aerating regulation pond, in equalizing tank, pH robot control system(RCS) regulates the addition of sulfuric acid, and micro-pore aeration intensity is 5m
3(air)/m
3(waste water), equalizing tank upper strata oil skimmer vessel, irregularly skims the oil slick except the water surface.The time that waste water stops in equalizing tank is that the wastewater pH of 13min, PH aerating regulation pond water outlet controls about 4.5, and oil-contg is at 7.2mg/l, and water temperature is 49 ° of C.
(2) behind PH aerating regulation pond, wastewater temperature is at 49 ° of C, and plate-type heat exchanger reduces the water temperature of waste water, and output water temperature is 33 degree.Recirculated cooling water used is process water.
(3) waste water through plate-type heat exchanger enters scum filter tank, is 100min in the residence time in scum filter tank.
In described scum filter tank, scum is selected from the blast furnace scum in Iron and Steel Production.Through screening, select the scum of 10.0mm.Described scum 20% alkali lye removes surperficial oil stain for 20 minutes in 90 degree of lower immersions, then soaks removal oxide on surface with the hydrochloric acid soln of 15%, cleaner with tap water.Described carbon granule is coke, selects particle diameter to be the carbon granule of 3.0mm.Described scum filter tank, the weight ratio of scum and carbon granule is: scum: carbon granule=1:0.3.Filler bottom described scum filter tank is porous, inorganic inert media, and accounting for filtrate volume ratio is 20%.
In scum filter tank, COD and the oil content of cold rolling alkaline oily(waste)water are removed greatly, and water outlet COD in scum filter tank is 57mg/l, and suspended substance is 73mg/l, and oil-contg is 2.1mg/l.
(4) water outlet of scum filter tank enters the further organics removal in chemical coagulation and precipitation pond and suspended substance.Iron trichloride selected by coagulating agent in described chemical coagulation and precipitation pond, and dosage is 200mg/l, and adding flocculation agent is anionic polyacrylamide, and dosage is 1mg/l.Coagulating agent and flocculation agent add in waste water by tubular type diffusion mixer, and enter hyperchannel flap coagulation basin after medicament and cold rolling alkaline oily(waste)water mixing, hydraulic detention time is 16min, and flow velocity is 0.6m/s, and flap angle is 102.5 degree.Then cold rolling alkaline oily(waste)water enters sloping plate deposition region.The swash plate region residence time is 30min, and sloping plate deposition sections bottom has bucket, and bucket has the gradient of 0.03, and is provided with the shore pipe that diameter is 200mm, the mud periodic cleaning of discharge and outward transport.
In chemical coagulation and precipitation pond, the COD of cold rolling alkaline oily(waste)water, suspended substance and oleaginousness are removed further, and the water-quality COD of water outlet is 32mg/l, and suspended substance is 39mg/l, and oil-contg is 0.3mg/l.
(5) wastewater supernatant fluid in chemical precipitation pond enters multilayer absorption filtering pool by force (forcing) pump.Filtrate in multilayer absorption filtering pool divides five layers, is quartz sand layer, grain slag layer, Flyash Layer, calcium base modified alta-mud and active carbon layer respectively.Quartz sand particle size is 2.8mm, uniformity coefficient 95%, SiO
2content 99.2%, Fe
2o
3content is lower than 0.2%.Grain slag chemical composition is mainly CaO:41%; SiO
2: 35%; Al
2o
3: 10%; MgO:12%; FeO:1.0%.The particle diameter of grain slag is 1.5mm, and uniformity coefficient is 95%.The chemical constitution mainly SiO of flyash
2: 52.6%; Al
2o
3: 28.6%; Fe
2o
3: 13.7%.The particle diameter of flyash is 2.5mm, and uniformity coefficient is 95%.Calcium base modified alta-mud particle diameter is 2.0mm, and water-intake rate is 150%, and gum level is 8ml/g, and expansion volume is 20%, Absorbance ratio-derivative method 0.5g/g, and cation exchange capacity is 0.9mmol/g, wet compressive strengths 25kPa, hot green tensile strength 0.7kPa.The particle diameter of gac is 3.2mm, and specific surface area is 3200m2/g, and surface density is 480g/l, and Absorbance ratio-derivative method is 0.8g/g.
In filter material layer, the volume ratio accounting for filtrate of quartz sand is 5%, and grain slag is 15%, and flyash is 20%, and calcium base modified alta-mud is 25%, and gac is 35%.
The flow velocity of cold rolling alkaline oily(waste)water in multilayer adsorption filter is 10m/h, and back flushing rate of expansion is 80%, backwashing period 48 hours.
After multilayer absorption filtering pool, effluent quality is COD is 11mg/l, and suspended substance is 17mg/l, and oil-contg is lower than 0.02mg/l.
(6) water outlet of multilayer absorption filtering pool enters reverse osmosis desalination treatment system.Desalting treatment system desalination rate 99.5%, average flux is 12L/m2.h, and pressure is 2.7MPa, obtains water rate 73%, and operating temperature is 25 degree.
After desalting treatment system, the water quality of cold rolling alkaline oily(waste)water is: pH is 7.3, COD is 7mg/l, and oil is lower than 0.02mg/l, and suspended substance is 0.7mg/l, specific conductivity 23 μ s/cm, and chlorion is 5.3mg/l, and water temperature is 25 degree.Effluent quality reaches standards for industrial water usage, again can be back to production system.
Embodiment 2
A process for reclaiming for cold rolling alkaline oily(waste)water, step is as follows:
(1) bio-chemical effluent (former water) of cold rolling alkaline oily(waste)water enters PH aerating regulation pond.Raw water quality: pH is 11, COD is 110mg/l, and oil is 9mg/l, and suspended substance is 120mg/l, and specific conductivity is 4700 μ s/cm, and chlorion is 765mg/l, and water temperature is 47 degree.Add the dense Waste Sulfuric Acid of 50% in PH aerating regulation pond, in equalizing tank, PH robot control system(RCS) regulates the addition of sulfuric acid, and micro-pore aeration intensity is 5m3(air)/m3(waste water), equalizing tank upper strata oil skimmer vessel, irregularly skims the oil slick except the water surface.The time that waste water stops in equalizing tank is that the waste water PH of 13min, PH aerating regulation pond water outlet controls about 6, and oil-contg is at 6.8mg/l, and water temperature is 46oC.
(2) behind PH aerating regulation pond, wastewater temperature is at 46 ° of C, and plate-type heat exchanger reduces the water temperature of waste water, and output water temperature is 30 ° of C.Recirculated cooling water used is process water.
(3) waste water through plate-type heat exchanger enters scum filter tank, is 65min in the residence time in scum filter tank.
In scum filter tank, scum is selected from the blast furnace scum in Iron and Steel Production.Through screening, select the scum of 10.0mm.Described scum 20% alkali lye removes surperficial oil stain for 20 minutes in 90 degree of lower immersions, then soaks removal oxide on surface with the hydrochloric acid soln of 15%, cleaner with tap water.Described carbon granule is coke, selects particle diameter to be the carbon granule of 5mm.Described scum filter tank, the weight ratio of scum and carbon granule is: scum: carbon granule=1:0.1.Filler bottom described scum filter tank is porous, inorganic inert media, and accounting for filtrate volume ratio is 30%.
In scum filter tank, COD and the oil content of cold rolling alkaline oily(waste)water are removed greatly, and water outlet COD in scum filter tank is 36mg/l, and suspended substance is 62mg/l, and oil-contg is 1.7mg/l.
(4) water outlet of scum filter tank enters the further organics removal in chemical coagulation and precipitation pond and suspended substance.The compounding coagulation agent prescription of aluminum chloride content 35%, Tai-Ace S 150 40%, polyaluminium sulfate 25% selected by coagulating agent in described chemical coagulation and precipitation pond, and dosage is 150mg/l, and adding flocculation agent is sodium polyacrylate, and dosage is 0.5mg/l.Coagulating agent and flocculation agent add in waste water by tubular type diffusion mixer, and enter hyperchannel flap coagulation basin after medicament and cold rolling alkaline oily(waste)water mixing, hydraulic detention time is 15min, and flow velocity is 0.6m/s, and flap angle is 102.5 degree.Then cold rolling alkaline oily(waste)water enters sloping plate deposition region.The swash plate region residence time is 30min, and sloping plate deposition sections bottom has bucket, and bucket has the gradient of 0.03, and is provided with the shore pipe that diameter is 200mm, the mud periodic cleaning of discharge and outward transport.
In chemical coagulation and precipitation pond, the COD of cold rolling alkaline oily(waste)water, suspended substance and oleaginousness are removed further, and the water-quality COD of water outlet is 25mg/l, and suspended substance is 33mg/l, and oil-contg is 0.2mg/l.
(5) wastewater supernatant fluid in chemical precipitation pond enters multilayer absorption filtering pool by force (forcing) pump.
Filtrate in multilayer absorption filtering pool divides five layers, is quartz sand layer, grain slag layer, Flyash Layer, calcium base modified alta-mud and gac respectively.Described quartz sand particle size is 4mm, uniformity coefficient 96%, SiO
2content 99.2%, Fe
2o
3content is lower than 0.2%.Described grain slag chemical composition is mainly CaO:42%; SiO
2: 25%; Al
2o
3: 12%; MgO:9%; FeO:0.7%.The particle diameter of grain slag is 3.5mm, and uniformity coefficient is 96%.The chemical constitution mainly SiO of flyash
2: 53.8%; Al
2o
3: 30.2%; Fe
2o
3: 10.8%.The particle diameter of flyash is 2.8mm, and uniformity coefficient is 95%.Described calcium base modified alta-mud particle diameter is 2.1mm, and water-intake rate is 200%, and gum level is 10ml/g, and expansion volume is 15%, Absorbance ratio-derivative method 0.4g/g, and cation exchange capacity is 0.8mmol/g, wet compressive strengths 30kPa, hot green tensile strength 1.0kPa.The particle diameter of described gac is 1.5mm, and specific surface area is 2000m
2/ g, surface density is 450g/l, and Absorbance ratio-derivative method is 1.0g/g.
In filter material layer, the volume ratio accounting for filtrate of quartz sand is 10%, and grain slag is 10%, and flyash is 20%, and calcium base modified alta-mud is 30%, and gac is 30%.
The flow velocity of cold rolling alkaline oily(waste)water in multilayer adsorption filter is 12m/h, and back flushing rate of expansion is 75%, backwashing period 72 hours.
After multilayer absorption filtering pool, effluent quality is COD is 8mg/l, and suspended substance is 15mg/l, and oil-contg is lower than 0.02mg/l.
(6) water outlet of multilayer absorption filtering pool enters reverse osmosis desalination treatment system.Desalting treatment system desalination rate 99.6%, average flux is 10L/m2.h, and pressure is 2.7MPa, obtains water rate 75%, and operating temperature is 25 degree.
After desalting treatment system, the water quality of cold rolling alkaline oily(waste)water is: pH is 7.1, COD is 4.3mg/l, and oil is lower than 0.02mg/l, and suspended substance is 0.8mg/l, specific conductivity 21 μ s/cm, and chlorion is 4.8mg/l, and water temperature is 25 degree.Effluent quality reaches standards for industrial water usage, again can be back to production system.
Embodiment 3
A process for reclaiming for cold rolling alkaline oily(waste)water, step is as follows:
(1) bio-chemical effluent (former water) of cold rolling alkaline oily(waste)water enters PH aerating regulation pond.Raw water quality: pH is 12, COD is 160mg/l, and oil is 12mg/l, and suspended substance is 130mg/l, and specific conductivity is 5000 μ s/cm, and chlorion is 1180mg/l, and water temperature is 50 degree.Add the dense Waste Sulfuric Acid of 80% in pH aerating regulation pond, in equalizing tank, pH robot control system(RCS) regulates the addition of sulfuric acid, and micro-pore aeration intensity is 5m
3(air)/m
3(waste water), equalizing tank upper strata oil skimmer vessel, irregularly skims the oil slick except the water surface.The time that waste water stops in equalizing tank is that the wastewater pH of 15min, PH aerating regulation pond water outlet controls about 4.5, and oil-contg is at 12mg/l, and water temperature is 45 ° of C.
(2) behind PH aerating regulation pond, wastewater temperature is at 45 ° of C, and plate-type heat exchanger reduces the water temperature of waste water, and output water temperature is 35 degree.Recirculated cooling water used is process water.
(3) waste water through plate-type heat exchanger enters scum filter tank, is 120min in the residence time in scum filter tank.
In described scum filter tank, scum is selected from the blast furnace scum in Iron and Steel Production.Through screening, select the scum of 2.0mm.Described scum 20% alkali lye removes surperficial oil stain for 20 minutes in 90 degree of lower immersions, then soaks removal oxide on surface with the hydrochloric acid soln of 15%, cleaner with tap water.Described carbon granule is coke, selects particle diameter to be the carbon granule of 6.0mm.Described scum filter tank, the weight ratio of scum and carbon granule is: scum: carbon granule=1:0.03.Filler bottom described scum filter tank is porous, inorganic inert media, and accounting for filtrate volume ratio is 50%.
In scum filter tank, COD and the oil content of cold rolling alkaline oily(waste)water are removed greatly, and water outlet COD in scum filter tank is 57mg/l, and suspended substance is 70mg/l, and oil-contg is 2.2mg/l.
(4) water outlet of scum filter tank enters the further organics removal in chemical coagulation and precipitation pond and suspended substance.Iron trichloride selected by coagulating agent in described chemical coagulation and precipitation pond, and dosage is 200mg/l, and adding flocculation agent is anionic polyacrylamide, and dosage is 2.5mg/l.Coagulating agent and flocculation agent add in waste water by tubular type diffusion mixer, and enter hyperchannel flap coagulation basin after medicament and cold rolling alkaline oily(waste)water mixing, hydraulic detention time is 20min, and flow velocity is 0.2m/s, and flap angle is 105 degree.Then cold rolling alkaline oily(waste)water enters sloping plate deposition region.The swash plate region residence time is 30min, and sloping plate deposition sections bottom has bucket, and bucket has the gradient of 0.03, and is provided with the shore pipe that diameter is 200mm, the mud periodic cleaning of discharge and outward transport.
In chemical coagulation and precipitation pond, the COD of cold rolling alkaline oily(waste)water, suspended substance and oleaginousness are removed further, and the water-quality COD of water outlet is 32mg/l, and suspended substance is 39mg/l, and oil-contg is 0.3mg/l.
(5) wastewater supernatant fluid in chemical precipitation pond enters multilayer absorption filtering pool by force (forcing) pump.Filtrate in multilayer absorption filtering pool divides five layers, is quartz sand layer, grain slag layer, Flyash Layer, calcium base modified alta-mud and active carbon layer respectively.Quartz sand particle size is 7.0mm, uniformity coefficient 98%, SiO
2content 95.2%, Fe
2o
3content is lower than 0.2%.Grain slag chemical composition is mainly CaO:45%; SiO
2: 41%; Al
2o
3: 10%; MgO:12%; FeO:1.0%.The particle diameter of grain slag is 1.5mm, and uniformity coefficient is 95%.The chemical constitution mainly SiO of flyash
2: 52.6%; Al
2o
3: 28.6%; Fe
2o
3: 13.7%.The particle diameter of flyash is 2.5mm, and uniformity coefficient is 95%.Calcium base modified alta-mud particle diameter is 2.0mm, and water-intake rate is 150%, and gum level is 8ml/g, and expansion volume is 20%, Absorbance ratio-derivative method 0.5g/g, and cation exchange capacity is 0.9mmol/g, wet compressive strengths 25kPa, hot green tensile strength 0.7kPa.The particle diameter of gac is 3.2mm, and specific surface area is 3200m2/g, and surface density is 480g/l, and Absorbance ratio-derivative method is 0.8g/g.
In filter material layer, the volume ratio accounting for filtrate of quartz sand is 12%, and grain slag is 10%, and flyash is 18%, and calcium base modified alta-mud is 15%, and gac is 45%.
The flow velocity of cold rolling alkaline oily(waste)water in multilayer adsorption filter is 15m/h, and back flushing rate of expansion is 80%, backwashing period 70 hours.
After multilayer absorption filtering pool, effluent quality is COD is 11mg/l, and suspended substance is 17mg/l, and oil-contg is lower than 0.02mg/l.
(6) water outlet of multilayer absorption filtering pool enters reverse osmosis desalination treatment system.Desalting treatment system desalination rate 99.6%, average flux is 14L/m
2.h, pressure is 2.7MPa, obtains water rate 73%, and operating temperature is 22 degree.
After desalting treatment system, the water quality of cold rolling alkaline oily(waste)water is: pH is 7.5, COD is 8mg/l, and oil is lower than 0.02mg/l, and suspended substance is 0.8mg/l, specific conductivity 25 μ s/cm, and chlorion is 4.3mg/l, and water temperature is 25 degree.Effluent quality reaches standards for industrial water usage, again can be back to production system.
Cold rolling alkaline oily(waste)water reclaiming system one-time investment of the present invention is low; Liquid waste disposal effect stability; Production run cost is low; Level of automation is high, simple to operate.The present invention has fully demonstrated the effect of energy-saving and emission-reduction, is environmentally friendly green process for producing steel and iron.The process for reclaiming of cold rolling alkaline oily(waste)water provided by the invention, realize the object of utilization of wastewater resource, promote the service efficiency of trade effluent, reduce the quantity discharged of ton steel waste water, both the cold rolling alkaline oily(waste)water of recycle, additionally reduced the consumption of new water.Based on recycle and energy-saving and emission-reduction, reduce environmental pollution, there is economy and environmental protection double effects, there is good social benefit and environmental benefit.
Those skilled in the art in the art will be appreciated that, above-described embodiment is only used to the present invention is described, but not be used as limitation of the invention, as long as in spirit of the present invention, the conversion of above-described embodiment, distortion all will be dropped in the scope of the claims in the present invention.
Claims (10)
1. a process for reclaiming for cold rolling alkaline oily(waste)water, in turn includes the following steps:
(1) pH aerating regulation: cold rolling alkaline oily(waste)water enters pH regulator aeration tank, adds acid in pH regulator aeration tank, regulates alkaline oily(waste)water pH value 4.0 ~ 9.0;
(2) cool: the cold rolling alkaline oily(waste)water temperature through step (1) pH regulator is down to 18 ~ 35 DEG C;
(3) scum filter tank: the cold rolling alkaline oily(waste)water after step (2) cooling enters scum filter tank, adds scum and carbon granule to scum filter tank; The described weight ratio adding scum and carbon granule is: scum: carbon granule=1:0.03 ~ 0.3;
(4) chemical coagulation and precipitation: enter chemical coagulation and precipitation pond from the water outlet in step (3) scum filter tank, coagulating agent and flocculation agent is added to chemical coagulation and precipitation pond, described coagulant charging quantity is 5mg/l ~ 200mg/l, and described flocculant dosage is 0.2mg/l ~ 2.5mg/l;
(5) multilayer adsorption filtration: the wastewater supernatant fluid through step (4) chemical coagulation and precipitation process enters multilayer absorption filtering pool; The filter material layer of described absorption filtering pool is followed successively by quartz sand layer, grain slag layer, Flyash Layer, calcium base bentone soil layer and active carbon layer;
(6) desalting treatment: the water outlet through step (5) multilayer adsorption filtration process enters reverse osmosis desalination treatment system, carries out desalting treatment.
2. the process for reclaiming of cold rolling alkaline oily(waste)water according to claim 1, it is characterized in that, after described step (6) desalting treatment, the water quality of cold rolling alkaline oily(waste)water is: pH is 6 ~ 9, COD is 2 ~ 10mg/l, oil is lower than 0.03mg/l, and suspended substance is 0 ~ 2mg/l, and specific conductivity is lower than 50 μ s/cm, chlorion is 2 ~ 30mg/l, and water temperature is 18 ~ 35 DEG C.
3. the process for reclaiming of cold rolling alkaline oily(waste)water according to claim 1, is characterized in that, be selected from one or more of sulfuric acid, hydrochloric acid or nitric acid in the acid of described step (1).
4. the process for reclaiming of cold rolling alkaline oily(waste)water according to claim 1, is characterized in that, the time that waste water stops in pH regulator aeration tank in described step (1) is 3 ~ 15min.
5. the process for reclaiming of cold rolling alkaline oily(waste)water according to claim 1, is characterized in that, described step (2) cools with plate-type heat exchanger, and the recirculated cooling water of described plate-type heat exchanger is process water.
6. the process for reclaiming of cold rolling alkaline oily(waste)water according to claim 1, is characterized in that,
The scum of described step (3) is selected from blast furnace scum, cast iron scum, one or more of scum that mechanical workout produces; Described scum particle diameter is 2.0 ~ 10.0mm;
Described step (3) carbon granule be selected from coke, gac, cinder, hard coal one or more; The particle diameter of described carbon granule is 0.3 ~ 6.0mm;
The described scum filter tank waste water that enters is 30 ~ 120min in the residence time in scum filter tank.
7. the process for reclaiming of cold rolling alkaline oily(waste)water according to claim 1, is characterized in that,
The coagulating agent of described step (4) is selected from iron trichloride, one or more of aluminum chloride, Tai-Ace S 150, polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate; Described flocculation agent is selected from anionic polyacrylamide, polyacrylonitrile, sodium polyacrylate, calcium polyacrylate (CPA), one or more of gelatin;
In described step (4), cold rolling alkaline oily(waste)water hydraulic detention time is 8 ~ 20min, and flow velocity is 0.2m/s ~ 0.8m/s, and flap angle is 95-105 degree.
8. the process for reclaiming of cold rolling alkaline oily(waste)water according to claim 1, it is characterized in that, in the filter material layer of described step (5), quartz sand accounts for the volume ratio of total filtrate is 2% ~ 12%, the volume ratio that grain slag accounts for total filtrate is 5% ~ 17%, the volume ratio that flyash accounts for total filtrate is 10 ~ 30%, the volume ratio that calcium base modified alta-mud accounts for total filtrate is 15% ~ 45%, and the volume ratio that gac accounts for total filtrate is 20 ~ 50%.
9. the process for reclaiming of cold rolling alkaline oily(waste)water according to claim 1, it is characterized in that, in described step (5), the flow velocity of cold rolling alkaline oily(waste)water in multilayer absorption filtering pool is 5m/h ~ 15m/h, back flushing rate of expansion is 50% ~ 100%, and backwashing period is 36h ~ 96h.
10. the process for reclaiming of cold rolling alkaline oily(waste)water according to claim 1, is characterized in that, in described step (5), the particle diameter of quartz sand is 0.8 ~ 7.0mm, uniformity coefficient 90% ~ 98%, SiO
2content 98.3% ~ 99.5%, Fe
2o
3content is lower than 0.2%;
Grain slag chemical composition in described grain slag layer is mainly CaO:32 ~ 45%; SiO
2: 22 ~ 41%; Al
2o
3: 5 ~ 15%; MgO:2 ~ 15%; FeO:0.5 ~ 1.0%; The particle diameter of grain slag is 0.5 ~ 12.0mm, and uniformity coefficient is 85% ~ 98%;
The chemical composition mainly SiO of described flyash
2: 45.2% ~ 59.6%; Al
2o
3: 18.6% ~ 35.6%; Fe
2o
3: 3.5 ~ 15.6%; The particle diameter of flyash is 0.5 ~ 9.0mm, and uniformity coefficient is 90% ~ 98%;
Described calcium base modified alta-mud particle diameter is 1.2 ~ 15.0mm, water-intake rate is 50% ~ 350%, gum level is 2 ~ 15ml/g, expansion volume is 5 ~ 25%, Absorbance ratio-derivative method 0.1 ~ 0.6g/g, cation exchange capacity is 0.3 ~ 1.2mmol/g, wet compressive strengths 10 ~ 35kPa, hot green tensile strength 0.3 ~ 1.4kPa;
The particle diameter of described gac is 0.3 ~ 5.0mm, and specific surface area is 800 ~ 5000m
2/ g, surface density is 370 ~ 580g/l, and Absorbance ratio-derivative method is 0.1 ~ 1.3g/g.
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| CN113896337A (en) * | 2020-06-22 | 2022-01-07 | 宝山钢铁股份有限公司 | Cold rolling alkali washing waste liquid recycling process |
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