CN103466884A - Process for treating waste paper pulping and papermaking waste water - Google Patents
Process for treating waste paper pulping and papermaking waste water Download PDFInfo
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- CN103466884A CN103466884A CN2013104141381A CN201310414138A CN103466884A CN 103466884 A CN103466884 A CN 103466884A CN 2013104141381 A CN2013104141381 A CN 2013104141381A CN 201310414138 A CN201310414138 A CN 201310414138A CN 103466884 A CN103466884 A CN 103466884A
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Abstract
The invention relates to a process for treating waste paper pulping and papermaking waste water. The process comprises the following steps of: removing large-particle suspended matters from waste paper pulping and papermaking waste water through a grille well arranged at a discharge outlet, then feeding the waste paper pulping and papermaking waste water in a water collection tank, and pumping into a filtration system of an inclined screen device through a waste water lift pump; regulating and homogenizing the quality and quantity of waste water in a regulating tank, pumping water from the regulating tank into a horizontal-flow flotation tank through the lift pump, feeding a coagulant for coagulating sedimentation; feeding outflowing water of the horizontal-flow flotation tank into a middle tank, pumping a part of outflowing water into a workshop for reuse through a backflow pump, and pumping the rest part of outflowing water into an anaerobic tank; enabling the outflowing water of the anaerobic tank to an aerobic tank, enabling the outflowing water of the aerobic tank to a secondary sedimentation tank; enabling a part of outflowing water sedimented to flow in a recycling water collection tank and then pumped into the workshop for recycling; and enabling the other part of outflowing water to flow in a terminal discharge tank to reach the emission standard; enabling a part of biochemical sludge discharged from the secondary sedimentation tank to flow back to the aerobic tank, and enabling the other part of sludge to flow in a sludge thickening tank to be thickened, discharging supernatant of the secondary sedimentation tank into the regulating tank, and enabling the thickened filtrate to flow back into the regulating tank.
Description
Technical field
The invention belongs to the field of papermaking technical field of waste water processing, specifically a kind of Waste Water of Pulp and Paper Making from Waste Paper treatment process.
Background technology
Papermaking technology is one of four inventions of the Chinese nation, is the important achievement on history of human civilization.In recent years, the paper-making industry high speed development of China, approximately 2,500 ten thousand tons of the total amounts of China's paper and cardboard consumption, pre-capita consumption reaches 38 kilograms.
Waste paper is as a kind of important renewable resource, and its recycling has good economy and social benefit, to environment protection and the utilization of resources all tool be of great significance.Use waste paper to carry out pulping and paper-making, not only can reduce Deforestation, and can reduce directly and carry out with raw material the pollution that slurrying causes.But the COD in waste paper making wastewater, BOD content are still higher, and its suspended substance mainly contains printing ink, fiber, filler, auxiliary agent etc.Directly enter if not treated and receive water body to cause serious pollution to environment.
The processing of current domestic papermaking (waste paper class) waste water, adopt traditional By Bubble-floating Method processing waste water, is conceived to the part recycle more and makes to process the discharge of water water quality reaching standard above, and result is that the wastewater discharge and the processing water Effects of Water Quality that reduce are unsatisfactory.In recent years, the closed circulation of paper waste and " zero release " technology become the important directions of paper waste Processing Technology Research.
Paper waste is because Pollutant levels are high, complicated component, and biodegradability is poor, and flow and fluctuation of load form as one of unmanageable trade effluent more greatly.Its treatment process mainly contains following several:
(1) Physical: the principle based on physical action, it is main removing undissolved suspended solid, removes the material that part causes producing biochemical oxygen demand simultaneously, reduces and eliminate the effect of chroma in waste water, treating processes does not change the chemical property of pollution substance.Usually adopt filtration method, the precipitator method, By Bubble-floating Method etc.
(2) chemical method: utilize the effect of pharmaceutical chemicals, regulate the waste liquor PH value, it is main reducing and eliminating colourity, and the effect of also removing part biochemical oxygen demand and suspended solid, comprise oxidation style, reduction method, neutralisation and flocculent precipitation simultaneously.
(3) physico-chemical processes: the principle combined based on physical action and chemical reaction: comprise active carbon adsorption, ion exchange method, electroosmose process.The processing costs of physico-chemical process is higher, belongs to the method for advanced treatment, is used in the situation of having relatively high expectations for emission standard.
(4) biological process: utilize the metabolic function of microorganism effectively to dispose waste liquid, that in waste water, dissolve or be the organic pollution materials of colloidal state, under the effect of microorganism, progressively degraded, finally transform into harmless lower-molecular substance, and waste water is purified.
Summary of the invention
The object of the present invention is to provide a kind of Waste Water of Pulp and Paper Making from Waste Paper treatment process.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of Waste Water of Pulp and Paper Making from Waste Paper treatment process, is characterized in that, comprises the following steps:
(1) Waste Water of Pulp and Paper Making from Waste Paper enters water collecting basin after the grille well of discharge outlet setting is removed the macrobead suspended substance, by the waste water lifting pump, pumps into slanted screen device filtering system;
(2) water outlet of step (1) slanted screen device filtering system flow to equalizing tank, adjusting, homogenizing water quality and quantity, and lift pump pumps into the advection air flotation pool by the water in equalizing tank, and dosing coagulant carries out coagulating sedimentation;
(3) water outlet of advection air flotation pool flow to intermediate pool, and a part pumps into the workshop reuse by the backflow lift pump, and remaining part pumps into anaerobic pond by lift pump, utilizes the organism in the anaerobic sludge Decomposition Wastewater;
(4) the anaerobic pond water outlet is to Aerobic Pond, aerobic microbiological consumes oxygen in muddy water mixed solution, organic substance decomposing in waste water is fallen, the Aerobic Pond water outlet is to second pond, by the suspended substance in water and biological sludge and moisture from, a water outlet part after precipitation flows into reuse between reuse water collecting basin pumping vehicle, another part inflow terminal letdown tank qualified discharge;
(5) biochemical sludge that second pond is discharged, a part is back to Aerobic Pond, and another part enters sludge thickener and is concentrated, and the supernatant liquor of second pond enters equalizing tank, the mud outward transport after concentrating, the filtrate flow after concentrating returns equalizing tank, the workshop reuse.
In described step (2), flocculation agent is PAC, PAM, and described flocculation agent PAC, PAM concentration are 0.1～0.3%.
In described step (2), the coagulating time is 10-20min, at first adds flocculation agent PAC, forms tiny flocs unit, flocculation agent PAC dosage 3-6mg/L, then add flocculation agent PAM, PAM dosage 5-7mg/L.
Drop into the floating stuffing ball in described anaerobic pond.
Described anaerobic pond comprises a UASB anaerobic pond and the 2nd UASB anaerobic pond; Described Aerobic Pond comprises the first Aerobic Pond and the second Aerobic Pond.
After described step (2) flocculation sediment, Xiang Shuizhong passes into dissolved air water, dissolved air water produces a large amount of microbubbles, and impel it to attach on flco, form the buoyancy aid that proportion is less than water, under buoyancy, float up to the water surface, realize that solid-liquid separates scum silica frost and regularly scrapes the slag cleaning by slag scraper, enter sludge sump blowback beater room and use, clear water flows into intermediate pool.
The present invention has the following advantages with respect to prior art:
1, less investment, saved a large amount of floor spaces, processes wastewater flow rate large, and the reuse paper pulp amount is large.
2, system, strong shock resistance adaptable to the water yield, water quality, temperature variation.
3, maintenance management is simple and convenient; Working cost is low, produce sludge quantity seldom, easily precipitation.
4, waste paper making wastewater after treatment, is directly used in production, and reclamation rate reaches more than 95%, real realization " zero release ".
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1
Table 1: the water-quality guideline of certain Waste Water of Pulp and Paper Making from Waste Paper is as shown in the table:
| Sequence number | 1 | 2 | 3 | 4 | 5 |
| The pollutent title | CODcr | BOD5 | SS | Colourity | pH |
| Pollutant levels | 3500mg/L | 600mg/L | 2500mg/L | 100 times | 6～9 |
A kind of Waste Water of Pulp and Paper Making from Waste Paper treatment process comprises the following steps:
1, the various waste water of workshop discharge enter the pump well removal of impurities after removing larger outstanding, floating matter by each discharge outlet grid, pump into slanted screen device filtering system by the waste water lifting pump, the fiber of missing except the middle pre-treatment of anhydrating at this.Paper pulp pumps into the workshop reuse with pump, and the waste water after filtration, for subsequent disposal, reduces and processes load, reduces reagent consumption.
2, water outlet is from flowing to equalizing tank, at this adjusting, homogenizing water quality and quantity.Pump into the advection air flotation pool by waste water two-stage hoisting pump again, waste water, by entering reaction tank, injects flocculation agent PAC simultaneously, and flocculation agent PAC concentration is 0.1～0.3%, flocculation agent PAC dosage 3-6mg/L.Utilize under hydraulic action and mixed, form tiny flocs unit.Add again a small amount of flocculation agent PAM solution, flocculation agent PAM dosage 5-7mg/L, under the cohesion and bridging action of flocculation agent PAM, the further polymerization of the suspended solid formed in waste water forms the flco of larger particles, because flow velocity slows down, flocs unit further increases, and the flocculation reaction time is 10-20min.Xiang Shuizhong passes into dissolved air water, and dissolved air water produces a large amount of microbubbles by special reliever, and impels it to attach on flco, forms the buoyancy aid that proportion is less than water, under buoyancy, floats up to the water surface, realizes that solid-liquid separates.Scum silica frost is regularly scraped the slag cleaning by slag scraper, enters sludge sump blowback beater room and uses.
3, the water outlet of advection air flotation pool, from flowing into intermediate pool, directly pumps into the workshop reuse by the reuse lift pump, and another part pumps into anaerobic pond by lift pump.
In anaerobic technique, at first be that a large amount of microorganisms is held back particulate matter in water and colloidalmaterial and adsorb, this is the rapid reaction of a physical process, the material be retained down is adsorbed on Sludge Surface, the metabolism that is decomposed at leisure, it is greater than hydraulic detention time at intrasystem sludge retention time.Under the effect of a large amount of hydrolytic bacterias, by insoluble hydrolysis of organic matter, be dissolved organic matter, simultaneously under acid-producing bacteria collaborative by macromolecular substance, be difficult to degradable chemical and be converted into and be easy to biodegradable small-molecule substance.Through anaerobic treatment, the BOD5/CODcr value of waste water is improved, and is conducive to the normal operation of aerobic system, improves the clearance of pollutent, to alleviate the load of follow-up biochemical treatment.
For strengthening biochemical effect, drop into a certain amount of floating stuffing ball in anaerobic pond.The nutritive substances such as anaerobic pond N, P adopt artificial dosing method to carry out.
4, the anaerobic pond water outlet is flow automatically to Aerobic Pond and is processed, a large amount of aerobic microbiologicals abrim in Aerobic Pond, and when wastewater streams during through sludge blanket, aerobic microbiological is adsorbable, the organic pollutant in degrading waste water.Due to aeration, biofilm surface constantly is subject to aeration stripping, has kept the activity of film, has suppressed the growth of anaerobism film, favourable to the utilization ratio that improves oxygen, has kept the active biomass of higher concentration.
Aerobic Pond adopts the form of three sections, and the properly distributed aeration rate, make leading portion aeration rate abundance, and the back segment aeration is inexcessive.Adopt the mode of air diffusion aerator and plug-flow in pond, effect by waterwall in plug-flow realizes rolling, guarantees effective residence time of current, reduces dead band, effectively increase the contact area of microbial film and the waste water of unit volume, strengthened the transmission of biochemical reaction boundary material.Organic Pollutants in Wastewater most pollutents after anaerobic pond, anaerobic pond, Aerobic Pond biochemical treatment are removed.
Mixed solution after aerobic treatment is from flowing into second pond, by the suspended substance in water and biological sludge and moisture from, reuse between the water outlet part inflow reuse water collecting basin pumping vehicle after precipitation, another part inflow terminal letdown tank qualified discharge.Second pond has resistance to overload shock, the characteristics that sedimentation effect is good.
5, the biochemical sludge that second pond is discharged, a part is back to Aerobic Pond, and a part enters sludge thickener and is concentrated, and the supernatant liquor of second pond enters equalizing tank.Sludge pump after concentrated is to being with press to carry out sludge dewatering, and after pressure filter press dry, mud cake labor cleaning pack, be transported to appointed place and stack, and filtrate is flowed back to wastewater equalization pond.
Table 2 is each unit B of the present invention OD5, CODcr, chroma removal rate.
Table 3: after processing, effluent quality is as shown in table 3 below:
| Sequence number | 1 | 2 | 3 | 4 | 5 |
| The pollutent title | CODcr | BOD5 | SS | Colourity | PH |
| Pollutant levels | ≤50mg/L | ≤15mg/L | ≤65mg/L | ≤ 20 times | 6～9 |
Claims (6)
1. a Waste Water of Pulp and Paper Making from Waste Paper treatment process, is characterized in that, comprises the following steps:
(1) Waste Water of Pulp and Paper Making from Waste Paper enters water collecting basin after the grille well of discharge outlet setting is removed the macrobead suspended substance, by the waste water lifting pump, pumps into slanted screen device filtering system;
(2) water outlet of step (1) slanted screen device filtering system flow to equalizing tank, adjusting, homogenizing water quality and quantity, and lift pump pumps into the advection air flotation pool by the water in equalizing tank, and dosing coagulant carries out coagulating sedimentation;
(3) water outlet of advection air flotation pool flow to intermediate pool, and a part pumps into the workshop reuse by the backflow lift pump, and remaining part pumps into anaerobic pond by lift pump, utilizes the organism in the anaerobic sludge Decomposition Wastewater;
(4) the anaerobic pond water outlet is to Aerobic Pond, aerobic microbiological consumes oxygen in muddy water mixed solution, organic substance decomposing in waste water is fallen, the Aerobic Pond water outlet is to second pond, by the suspended substance in water and biological sludge and moisture from, a water outlet part after precipitation flows into reuse between reuse water collecting basin pumping vehicle, another part inflow terminal letdown tank qualified discharge;
(5) biochemical sludge that second pond is discharged, a part is back to Aerobic Pond, and another part enters sludge thickener and is concentrated, and the supernatant liquor of second pond enters equalizing tank, the mud outward transport after concentrating, the filtrate flow after concentrating returns equalizing tank, the workshop reuse.
2. Waste Water of Pulp and Paper Making from Waste Paper treatment process according to claim 1, is characterized in that, in described step (2), flocculation agent is PAC, PAM, and described flocculation agent PAC, PAM concentration are 0.1～0.3%.
3. Waste Water of Pulp and Paper Making from Waste Paper treatment process according to claim 2, it is characterized in that, in described step (2), the coagulating time is 10-20min, at first add flocculation agent PAC, form tiny flocs unit, flocculation agent PAC dosage 3-6mg/L, then add flocculation agent PAM, flocculation agent PAM dosage 5-7mg/L.
4. Waste Water of Pulp and Paper Making from Waste Paper treatment process according to claim 1, is characterized in that, drops into the floating stuffing ball in described anaerobic pond.
5. Waste Water of Pulp and Paper Making from Waste Paper treatment process according to claim 1, is characterized in that, described anaerobic pond comprises a UASB anaerobic pond and the 2nd UASB anaerobic pond; Described Aerobic Pond comprises the first Aerobic Pond and the second Aerobic Pond.
6. Waste Water of Pulp and Paper Making from Waste Paper treatment process according to claim 1, it is characterized in that, after described step (2) flocculation sediment, Xiang Shuizhong passes into dissolved air water, dissolved air water produces a large amount of microbubbles, and impel it to attach on flco, form the buoyancy aid that proportion is less than water, under buoyancy, float up to the water surface, realize that solid-liquid separates scum silica frost and regularly scrapes the slag cleaning by slag scraper, enter sludge sump blowback beater room and use, clear water flows into intermediate pool.
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