CN103771681B - A kind ofly extract reuse paper waste biochemical sludge nitrogen phosphorus and realize the method for sludge dewatering - Google Patents
A kind ofly extract reuse paper waste biochemical sludge nitrogen phosphorus and realize the method for sludge dewatering Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000010893 paper waste Substances 0.000 title claims abstract description 18
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 239000000284 extract Substances 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910001868 water Inorganic materials 0.000 claims abstract description 56
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 27
- 230000000694 effects Effects 0.000 claims abstract description 25
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 24
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011574 phosphorus Substances 0.000 claims abstract description 11
- 238000004537 pulping Methods 0.000 claims abstract description 11
- 238000005189 flocculation Methods 0.000 claims abstract description 8
- 230000016615 flocculation Effects 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 239000002028 Biomass Substances 0.000 claims abstract description 6
- 239000004744 fabric Substances 0.000 claims description 11
- 239000012634 fragment Substances 0.000 claims description 8
- 239000002351 wastewater Substances 0.000 claims description 8
- 244000005700 microbiome Species 0.000 claims description 6
- 238000002203 pretreatment Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 239000002156 adsorbate Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000013467 fragmentation Methods 0.000 claims description 4
- 238000006062 fragmentation reaction Methods 0.000 claims description 4
- 230000003834 intracellular effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000005416 organic matter Substances 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 2
- 235000015097 nutrients Nutrition 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 abstract description 9
- 238000006297 dehydration reaction Methods 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 230000000050 nutritive effect Effects 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 7
- 239000000123 paper Substances 0.000 description 5
- 230000003203 everyday effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000005696 Diammonium phosphate Substances 0.000 description 1
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000274582 Pycnanthus angolensis Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 241000589651 Zoogloea Species 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 1
- 235000019838 diammonium phosphate Nutrition 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000618 nitrogen fertilizer Substances 0.000 description 1
- 210000004681 ovum Anatomy 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The present invention relates to and a kind ofly extract reuse papermaking biochemical sludge nitrogen phosphorus and realize the method for sludge dewatering, belong to pulping and paper-making field of Environment Protection.The present invention is directed to paper waste carbon source to enrich, nitrogen, phosphorus lack, and rich Nitrogen-and Phosphorus-containing in microbe in biochemical sludge, part biochemical sludge finally discharges water treatment system as excess sludge, and the present situation of dehydration difficulty.Adopt the method for ultrasonic disruption+flocculation+mechanism filter-pressing, first by hyperacoustic effect, microbe is broken, its inner material is discharged, solid-liquid separation is reached again by flocculation and mechanical effect, liquid is back to use process of paper-making wastewater treatment, process every t biochemical sludge can reclaim N and P and reach 0.45kg and more than 0.1kg, effectively reduce the nitrogen phosphorus that paper waste biochemical treatment adds; Mud mass dryness fraction can reach more than 50% simultaneously, and calorific value reaches more than 6MJ/kg, directly can burn in biomass boiler.Papermaking biochemical sludge is made to realize comprehensive utilization.
Description
Technical field
The present invention relates to and a kind ofly extract reuse paper waste biochemical sludge nitrogen phosphorus and realize the method for sludge dewatering, belong to pulping and paper-making environmental technology field.
Background technology
In paper-making process except producing a large amount of waste water, a large amount of solid waste is also had to produce, the former is at present because being subject to the extensive concern of national departments concerned and society, have also been taken a lot of effective control measures, special in the Eleventh Five-Year Plan period, the enforcement of relevant policies standard, and the renewal of enterprise technology equipment, the waste water of more than 96% realizes qualified discharge, and Wastewater Pollutant reduction of discharging obtains remarkable effect.Waste water is after physics, biology and chemical treatment, finally be separated with water body with the form of primary sludge, biochemical sludge and chemical sludge, along with raising, the monitoring strengthening of implementation dynamics and the continuous expansion of papermaking industry size of wastewater discharge standard, this kind of sludge yield also will continue high speed increase.Especially waste water is after the process of biological activated sludge method, and 0.5% ~ 1.0% of its volume precipitates with the form of residual active sludge.The aggregate that the organism of the zoogloea that residual active sludge is formed by multiple-microorganism and its absorption and inorganics form, the organism in addition also containing difficult degradation, nitrogen phosphorus, heavy metal and salt, and a small amount of pathogenic micro-organism and parasitic ovum etc.This kind of moisture percentage in sewage sludge is very high, generally all between 95% ~ 99.5%, is difficult to process, and its investment and working cost are comparatively large, can account for 25% ~ 65% of the investment of whole sewage work and working cost, become the economical load that waste water treatment plant is heavy.The mud generation of pulping wastewater treatment is large, is generally 5 ~ 10 times of same size municipal sewage plant.So a large amount of paper mill sludges, if do not carried out appropriate process, will cause secondary pollution.The harmless treatment of paper mill sludge has become environmental problem urgently to be resolved hurrily with disposal, and therefore, how economically these mud of disposal and utilization have become the problem that people are very concerned about.The key of sludge treatment is dehydration, this is because its water ratio becomes nonlinear relationship with its volume.Sludge dewatering effectively can reduce the sludge volume needing process to dispose, and being a kind of method the most economic in sludge reduction, is also that sludge ultimate disposal is as requisite links such as burning, compost.
In addition, in paper waste, carbon source is enriched, but nitrogen, phosphorus lack, and therefore need in waste water, add nutritive salt (nitrogenous fertilizer and phosphate fertilizer) in biochemical treatment process.If the day process water yield is 30000m
3pulping wastewater treatment station, entering biochemistry pool COD is 900mgL
-1, add nutritive salt in COD: N: P=350: 5: 1 ratio, the urea (every bag of 40kg) of nitrogen content 46.4% need be added and contain available phosphorus (with P
2o
5meter) 45% diammonium phosphate (every bag of 50kg) be respectively 17.2 bags and 7.9 bags.The purchase cost of nutritive salt is considerable.The machinery that added of nutritive salt adds method and manually adds method.Manpower and materials input by so a large amount of nutritive salt adds are also considerable.And the biochemical sludge main component of pulping wastewater treatment is microorganism.Carbon, nitrogen, phosphorus are the indispensable nutritive elements forming microorganism.If the nitrogen phosphorus in microbe effectively can be utilized, the input of part nutritive salt can be saved.
How effective nitrogen phosphate use in pulp and paper effluent treatment biochemical sludge to be got up, save adding of nitrogen and phosphorous nutrient in paper-making effluent, thus reduce costs, realize the deep dehydration of paper waste biochemical sludge simultaneously, improve its utilization ratio most important.Traditional concentrated/mechanical dehydration technique can only remove the pore water of major part in free state and part capillary water, be difficult to make mud realize deep dehydration, be also difficult to by the nitrogen Phosphurus release in the microbe of biochemical sludge out simultaneously, and utilized.
Summary of the invention
The invention provides and a kind ofly extract reuse paper waste biochemical sludge nitrogen phosphorus and realize the method for sludge dewatering.Enrich for paper waste carbon source, nitrogen, phosphorus lack, and rich Nitrogen-and Phosphorus-containing in microbe in biochemical sludge, and a part of biochemical sludge finally discharges water treatment system as excess sludge, and the present situation of dehydration difficulty.Adopt the method for ultrasonic disruption+flocculation agent+mechanism filter-pressing, first by hyperacoustic effect, microbe is broken, its inner material is discharged, by the effect such as to flutter of the charge neutrality of flocculation agent, adsorption bridging, net, fragment is wadded a quilt with cotton again poly-, effect finally by mechanism filter-pressing reaches solid-liquid separation, liquid is back to use in process of paper-making wastewater treatment, reuse nitrogen phosphorus, the nitrogen phosphorus that the biochemical treatment of effective minimizing paper waste adds, solid mass dryness fraction can reach more than 50% simultaneously, realize the deep dehydration of mud, directly can burn in biomass boiler.
For achieving the above object, concrete solution of the present invention is:
(1) pre-treatment of paper waste biochemical sludge
Get the pulping wastewater treatment biochemical sludge of 150ml, be 400 ~ 500W by power, frequency is the ultrasonic vibrations energy conversion apparatus of 20 ~ 25kHz, stretches in mud and processes 8 ~ 12s to it, realize the fragmentation of microorganism in biochemical sludge under hyperacoustic mechanical effect, cavitation effect effect.Intracellular organic matter and moisture are discharged, makes water in part born of the same parents be converted into planar water.
(2) flocculation treatment
Through the mud mixture that step (1) obtains, low whipping speed is under the condition of 300 ~ 400rpm, adding butt massfraction is the aluminium iron polychloride of 8 ~ 14%, after 30s, stirring velocity is adjusted to 50 ~ 80rpm, to add butt massfraction be the molecular weight of 0.1-0.5% be 1200 ~ 15,000,000 cationic-type polyacrylamide.It is poly-that the effect of being flutterred by charge neutrality, absorption, bridge formation and net makes mud fragment that wadding occur, and reduces the planar water of mud, make partial adsorbates water be converted into free water.
(3) mechanism filter-pressing
After step (1) and (2) process, adopt plate-and-frame filter press to carry out press filtration, solid-liquid is separated, the pressure of pressure filter used is 1.8 ~ 2.2Mpa, canvas press cloth is two-layer, is 200 orders with the aperture of mud contact layer, and the aperture of supporting layer is 40 orders.Under the effect of pressure filter, mud fragment is trapped on filter cloth, and mass dryness fraction can reach more than 50%, and its thermal value, at more than 6MJ/kg, can directly be sent biomass boiler to burn, realize the abatement of mud.Free water and planar water pass through canvas press cloth, in this part water, N, P concentration is respectively 4.6mg/L and more than 1.0mg/L, and COD concentration is about 240mg/L, the interpolation standard of concentration of nitrogen and phosphorus far above COD: N: P=350: 5: 1, this part water is sent back to paper waste biochemical treatment section, the addition of biochemical section N, P can be saved.
Accompanying drawing explanation
Fig. 1 invention schema;
The scanning electron microscope (SEM) photograph of mud before Fig. 2 pre-treatment;
The scanning electron microscope (SEM) photograph of mud after Fig. 3 pre-treatment.
Embodiment
Feature of the present invention is further illustrated below by concrete example.
Embodiment 1
Mud takes from the large-scale pulping and paper-making integrated factory 80,000 in Shandong m
3/ d waste water treatment engineering second pond, therefrom extracts reuse nitrogen phosphorus as follows and realizes deep dehydration:
(1) pre-treatment of paper waste biochemical sludge
Get the pulping wastewater treatment biochemical sludge of 150ml, be 400w by power, frequency is the ultrasonic vibrations energy conversion apparatus of 20kHz, stretches in mud and processes 10s to it, realize the fragmentation of microorganism in biochemical sludge under hyperacoustic mechanical effect, cavitation effect effect.Intracellular organic matter and moisture are discharged, makes water in part born of the same parents be converted into planar water.
(2) flocculation treatment
Through the mud mixture that step (1) obtains, low whipping speed is under the condition of 300rpm, adding butt massfraction is the aluminium iron polychloride of 10%, after 30s, stirring velocity is adjusted to 50rpm, add butt massfraction be 0.5% molecular weight be the cationic-type polyacrylamide of 12,000,000.It is poly-that the effect of being flutterred by charge neutrality, absorption, bridge formation and net makes mud fragment that wadding occur, and reduces the planar water of mud, make partial adsorbates water be converted into free water.
(3) mechanism filter-pressing
After step (1) and (2) process, adopt plate-and-frame filter press to carry out press filtration, solid-liquid is separated, the pressure of pressure filter used is 1.8Mpa, canvas press cloth is two-layer, is 200 orders with the aperture of mud contact layer, and the aperture of supporting layer is 40 orders.Under the effect of pressure filter, mud fragment is trapped on filter cloth, and mass dryness fraction can reach more than 53%, and its thermal value, at more than 6MJ/kg, can directly be sent biomass boiler to burn, realize the abatement of mud.Free water and planar water pass through canvas press cloth, in this part water, N, P concentration is respectively 4.6mg/L and 1.0mg/L, and COD concentration is 238mg/L, the interpolation standard of concentration of nitrogen and phosphorus far above COD: N: P=350: 5: 1, this part water is sent back to paper waste biochemical treatment section, 0.4kg biochemical sludge is produced by removal per kilogram COD, second pond biochemical sludge concentration is 0.91%, after process, the final mass dryness fraction of mud is more than 50%, process every t over dry biochemical sludge and take off more than 98t water, each 0.45kg and 0.1kg of recyclable N and P, 80,000 m
3the engineering of water treatment of/d, biochemical section influent COD is 900mg/L, and water outlet COD is 240mg/L, produces biochemical sludge oven-dry weight every day and is about 21.12t, then reuse N, P can be respectively 9.5kg and 2kg, with 80,000 m
3/ d engineering of water treatment calculates, and can save 9.5kg nitrogen and 2kg phosphorus every day, the amount can saving N and P for a year is respectively 3467.5kg and 730kg.
Embodiment 2
Mud takes from certain small-sized paper mill 30,000 m that Hebei is raw material production wrapping paper with waste and old boxboard
3/ d waste water treatment engineering second pond, therefrom extracts reuse nitrogen phosphorus as follows and realizes deep dehydration:
(1) pre-treatment of paper waste biochemical sludge
Get the pulping wastewater treatment biochemical sludge of 150ml, be 500w by power, frequency is the ultrasonic vibrations energy conversion apparatus of 25kHz, stretches in mud and processes 12s to it, realize the fragmentation of microorganism in biochemical sludge under hyperacoustic mechanical effect, cavitation effect effect.Intracellular organic matter and moisture are discharged, makes water in part born of the same parents be converted into planar water.
(2) flocculation treatment
Through the mud mixture that step (1) obtains, low whipping speed is under the condition of 400rpm, adding butt massfraction is the aluminium iron polychloride of 10%, after 30s, stirring velocity is adjusted to 80rpm, add butt massfraction be 0.1% molecular weight be the cationic-type polyacrylamide of 15,000,000.It is poly-that the effect of being caught by charge neutrality, absorption, bridge formation and net makes mud fragment that wadding occur, and reduces the planar water of mud, make partial adsorbates water be converted into free water.
(3) mechanism filter-pressing
After step (1) and (2) process, adopt plate-and-frame filter press to carry out press filtration, solid-liquid is separated, the pressure of pressure filter used is 2.2Mpa, canvas press cloth is two-layer, is 200 orders with the aperture of mud contact layer, and the aperture of supporting layer is 40 orders.Under the effect of pressure filter, mud fragment is trapped on filter cloth, and mass dryness fraction can reach more than 54%, and its thermal value, at more than 6MJ/kg, can directly be sent biomass boiler to burn, realize the abatement of mud.Free water and planar water pass through canvas press cloth, in this part water, N, P concentration is respectively 5.2mg/L and 1.1mg/L, and COD concentration is 260mg/L, the interpolation standard of concentration of nitrogen and phosphorus far above COD: N: P=350: 5: 1, this part water is sent back to paper waste biochemical treatment section, 0.4kg biochemical sludge is produced by the every kgCOD of removal, second pond biochemical sludge concentration is 0.91%, after process, the final mass dryness fraction of mud is more than 50%, process every t over dry biochemical sludge and take off more than 98t water, each 0.51kg and 0.11kg of recyclable N and P, 30,000 m
3the engineering of water treatment of/d, biochemical section influent COD is 1000mg/L, and water outlet COD is 250mg/L, produces biochemical sludge oven-dry weight every day and is about 9t, then reuse N, P can be respectively 4.6kg and 1.0kg, with 30,000 m
3/ d engineering of water treatment calculates, and can save 4.6kg nitrogen and 1.0kg phosphorus every day, the amount can saving N and P for a year is respectively 1679kg and 365kg.
Claims (1)
1. one kind is extracted reuse papermaking
waste waterbiochemical sludge nitrogen phosphorus also realizes the method for sludge dewatering, it is characterized in that, comprises the following steps:
(1) pre-treatment of paper waste biochemical sludge, gets a certain amount of pulping wastewater treatment biochemical sludge,
be 400 ~ 500W by power, ultrasonic frequency is the ultrasonic vibrations energy conversion apparatus of 20 ~ 25kHz, stretches into its process 8 ~ 12s in mud,under hyperacoustic mechanical effect, cavitation effect effect, realize the fragmentation of microorganism in biochemical sludge, intracellular organic matter and moisture are discharged, make water in part born of the same parents be converted into planar water, this part Shuifu County Nitrogen-and Phosphorus-containing;
(2) flocculation treatment, through the mud mixture that step (1) obtains, low whipping speed is under the condition of 300 ~ 400rpm, adding butt massfraction is the aluminium iron polychloride of 8 ~ 14%, after 30s, stirring velocity is adjusted to 50 ~ 80rpm, add butt massfraction be 0.1 ~ 0.5% molecular weight be 1200 ~ 1,500 ten thousand cationic-type polyacrylamide, it is poly-that the effect of being flutterred by charge neutrality, absorption, bridge formation and net makes mud fragment that wadding occur, reduce the planar water of mud, make partial adsorbates water be converted into free water;
(3) mechanism filter-pressing, after step (1) and (2) process, plate-and-frame filter press is adopted to carry out press filtration, free water and partial adsorbates water are taken off, this part water comprises the water of rich Nitrogen-and Phosphorus-containing in step (1), by this part Water circulation to pulping wastewater treatment biochemistry pool Substitute For Partial nitrogen and phosphorous nutrient, the pressure of pressure filter used is
1.8 ~ 2.2Mpa,canvas press cloth is two-layer, is 200 orders with the aperture of mud contact layer, and the aperture of supporting layer is 40 orders, mud mass dryness fraction after pressure filter press filtration can reach more than 50%, its thermal value, at more than 6MJ/kg, can directly be sent biomass boiler to burn, realize the abatement of mud;
Wherein free water and planar water pass through canvas press cloth, in this part water, N, P concentration is respectively 4.6mg/L and more than 1.0mg/L, and COD concentration is 240mg/L, the interpolation standard of concentration of nitrogen and phosphorus far above COD: N: P=350: 5: 1, this part water is sent back to paper waste biochemical treatment section, the addition of biochemical section N, P can be saved.
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