CN102515834B - Preparation method of waterworks sludge ceramsites for pretreating micro-polluted water - Google Patents
Preparation method of waterworks sludge ceramsites for pretreating micro-polluted water Download PDFInfo
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- CN102515834B CN102515834B CN2011103565062A CN201110356506A CN102515834B CN 102515834 B CN102515834 B CN 102515834B CN 2011103565062 A CN2011103565062 A CN 2011103565062A CN 201110356506 A CN201110356506 A CN 201110356506A CN 102515834 B CN102515834 B CN 102515834B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a preparation method of waterworks sludge ceramsites for pretreating micro-polluted water, belonging to the technical field of pretreatment of micro-polluted water. The method comprises the following steps of: uniformly mixing waterworks sludge serving as a major raw material with fly ash and a pore-forming agent in a certain mass ratio; adding a certain amount of water for pelletizing into balls in a ball forming mill; drying a spherical green stock, and performing continuous variable-temperature and constant-temperature baking; and naturally cooling and sieving to obtain finished ceramsites. In the method, waterworks sludge is fully utilized, and sludge is recycled; and moreover, a preparation process is simple, and cost is low. The ceramsites prepared with the method are provided with a plenty of micropores both on the surfaces and inside, and biofilm formation growth of microorganisms on the surfaces of the ceramsites is facilitated, so that the biological pretreating effect on water of a polluted water source is remarkably enhanced, and good social benefit and environmental protection benefit are achieved.
Description
Technical field
The invention belongs to micro-polluted water preconditioning technique field, be specifically related to a kind of preparation method who is used for the pretreated feedwater sludge ceramsite of micro-polluted water.
Background technology
Utilize Biological Pretreatment technology can effectively degrade dissolved organic matter and ammonia and nitrogen pollution in the micro-polluted source water.At present, the Biological Pretreatment technology is used to handle the most of biomembrance process that adopts of little source of pollution water carries out, and the core of biomembrance process is to select the carrier of appropriate filler as biological growth.Although there is diversified carrier to occur, at present ripe, the most the most frequently used still light ceramic.Conventional haydite adopts clay to be made as main raw material usually, but is that main raw material can consume a large amount of clay resources with the clay, destroy and plough, moreover clay resource is by special-protection-by-the-State at present, and clay uses and is subjected to strict restriction.
Along with the raising of environmental standard requirement and the development of sludge treatment technology, the approach of relevant recycling sludge utilization also receives much concern.But at present big quantity research and patented technology are absorbed in the processing and the resource utilization problem of municipal sewage sludge, then pay close attention to less to the mud of city water factory.2006 country revised " Code for design of outdoor water supply engineering " (GB50013-2006) clearly increased handling in the water treatment spoil disposal water, thereby inevitably produce a large amount of waterworks sludges.Therefore, probe into the processing of waterworks sludge and method of resource and become very urgent task.
At present the water supply plant dewatered sludge mostly is used as rubbish and landfill, but its percolate may polluted underground water, thereby drinking water safety is brought hidden danger.In addition, the investigator has also explored the possible method of resource of some waterworks sludges, as, remove sexavalent chrome in the sewage with waterworks sludge as sorbent material, phosphoric acid salt has been obtained effect preferably; Utilize waterworks sludge to fire the building brick that meets the demands; Utilizing waterworks sludge to fire high-strength ceramsite is used for concrete material of construction and also obtains good effect.Chinese patent CN1644565A discloses " a kind of method for preparing light ceramic with waterworks sludge and sewage plant sludge ", but the haydite of preparation also is to be used for strong concrete production.This shows, haydite with the waterworks sludge preparation mainly is used as material of construction at present, the special intensity of paying attention to haydite, and the haydite that the micro-polluted source water Biological Pretreatment is used, except need satisfy certain intensity, also need surface irregularity, certain aperture is arranged, help biomembranous growth, therefore on making method, exist obviously different with haydite for building.Up to now, also do not utilize waterworks sludge to make the relevant report of micro-polluted source water Biological Pretreatment with haydite as main raw material.The composition of waterworks sludge is very similar to the clay composition, utilizes the waterworks sludge instead of clay to fire micro-polluted source water Biological Pretreatment haydite, has both saved clay resource, has opened up the new way of waterworks sludge recycling again.
Summary of the invention
The present invention is directed to the problems referred to above that prior art exists, a kind of preparation method who is used for the pretreated feedwater sludge ceramsite of micro-polluted water is provided, and this method provides a kind of good carrier of biological growth and solves waterworks sludge resource utilization problem for the micro-polluted source water Biological Pretreatment.
The preparation method's concrete steps that are used for the pretreated feedwater sludge ceramsite of micro-polluted water provided by the present invention are as follows:
(1) preparation feedwater dewatered sludge: with the dewatered sludge of water supply plant water ratio 80wt%, forced air drying 2h under 105 ~ 110 ℃ of conditions obtains the feedwater dewatered sludge of water ratio 52wt%;
(2) raw material crushing and screening: after pulverizing with pulverizer with step (1) gained feedwater dewatered sludge, as the dried rice husk of pore-forming material, cross 100 order motor-vibro screens, obtain particle diameter respectively less than 100 purpose dewatered sludge and powdered rice hulls;
(3) raw material mixes: the prepared dewatered sludge of step (2), powdered rice hulls and flyash are joined to mix mix 30min in the still, make compound, the mass percent of described dewatered sludge, flyash and powdered rice hulls is respectively: 70 ~ 80%, 15 ~ 19% and 1 ~ 5%;
(4) granulation: step (3) gained compound is transferred in the tumbling disk granulator, adds the laggard capable granulation of entry, obtain the spherical raw material of particle diameter at 2 ~ 9mm, the quality that adds entry is 5 % of described mixture quality;
(5) spherical raw material drying and roasting: the spherical raw material of step (4) gained are changed in the rotary kiln, dry 60min under 105 ℃, setting the rotary kiln temperature rise rate is 5 ℃/min, and the rotary kiln temperature is raised to 300 ℃ gradually from 105 ℃, at 300 ℃ of lasting roasting 30min; Temperature rises to 500 ℃ from 300 ℃ then, at 500 ℃ of lasting roasting 30min; Temperature rises to 800 ℃ gradually from 500 ℃ then, at 800 ℃ of lasting roasting 30min, finishes sintering process, obtains sintering ceramsite;
(6) discharging cooling: step (5) gained sintering ceramsite is migrated out rotary kiln, naturally cool to room temperature;
(7) screening: the cooled haydite of step (6) gained is sieved, remove substandard product, obtain the haydite finished product of different-grain diameter.
Beneficial effect of the present invention is as follows:
(1) haydite provided by the present invention, it is made raw material water supply plant dewatered sludge, flyash and pore-forming material rice husk and is industry or agricultural wastes, open up the new way that these changing waste into resources utilize, met the policy of " recycling economy " that present country carrying forward vigorously.
(2) the present invention utilizes the water supply plant dewatered sludge to replace conventional clay to make haydite, can effectively protect clay resource, and then protect farmland.
(3) the present invention utilizes the agricultural wastes rice husk as pore-forming material, has avoided the use of conventional chemical medicament pore-forming material, has reduced production cost.
(4) making method of this haydite is simple, the sintering method that adopts continuous alternating temperature to combine in the making processes with constant temperature calcining, and the sintering that has significantly reduced haydite ftractures and fragmentation, has improved the yield rate of product.
(4) haydite that makes of this method, surface irregularity, surface and internal capillary are abundant, help microorganism in its surperficial biofilm growth, biomass is more, thereby promote the raising of micro-polluted source water Biological Pretreatment effect, remain at dissolved oxygen under the condition of 4.60 ~ 5.20mg/L, can be with COD in the micro-polluted source water
MnBe reduced to 3.66 ~ 4.78mg/L by 6.37 ~ 7.82mg/L, ammonia nitrogen is reduced to 0.28 ~ 0.42mg/L by 1.65 ~ 2.06mg/L, and effluent quality satisfies the requirement of source quality three class water bodys.
Preparation method provided by the invention is simple, raw material is a trade waste, meet the policy of " recycling economy " that present country advocating, this ceramic grain filter is used for the micro-polluted source water Biological Pretreatment, effectively pollutents such as dissolved organic matter and ammonia nitrogen in the degradation water.
Embodiment
The quality of each raw material is composed as follows among the embodiment 1-3 that present embodiment provides:
The dewatered sludge of embodiment 1:80%, 15% flyash and 5% pore-forming material powdered rice hulls.
The dewatered sludge of embodiment 2:70%, 29% flyash and 1% pore-forming material powdered rice hulls.
The dewatered sludge of embodiment 3:75%, 23% flyash and 2% pore-forming material powdered rice hulls.
The concrete preparation process of embodiment 1-3 is as follows:
(1) raw material drying dehydration:, obtain the feedwater dewatered sludge of water ratio 52wt% with dewatered sludge forced air drying 2h under 105 ℃ of-110 ℃ of conditions of water supply plant water ratio 80wt%.
(2) raw material crushing and screening: step (1) gained dewatered sludge and the dried rice husk of pore-forming material are pulverized with pulverizer, crossed 100 order motor-vibro screens, obtain particle diameter respectively less than 100 purpose dewatered sludge and powdered rice hulls.
(3) raw material mixes: step (2) gained dewatered sludge and powdered rice hulls and flyash are mixed 30min in mixing still, make the compound sample.
(4) granulation: step (3) gained compound sample is transferred in the tumbling disk granulator, adds entry simultaneously, carry out granulation, obtain the spherical raw material of particle diameter at 2 ~ 9mm.
(5) the dry and oven dry roasting of raw material: the spherical raw material of step (4) gained are changed in the rotary kiln, dry 60min under 105 ℃, setting the rotary kiln temperature rise rate is 5 ℃/min, and the rotary kiln temperature is raised to 300 ℃ gradually from 105 ℃, at 300 ℃ of lasting roasting 30min; Temperature rises to 500 ℃ from 300 ℃ then, at 500 ℃ of lasting roasting 30min; Temperature rises to 800 ℃ gradually from 500 ℃ then, at 800 ℃ of lasting roasting 30min, finishes sintering process, obtains sintering ceramsite;
(6) discharging cooling: step (5) gained sintering ceramsite is migrated out rotary kiln, naturally cool to room temperature;
(7) screening: the cooled haydite of step (6) gained is sieved, remove substandard product, obtain the haydite finished product of different-grain diameter.
The haydite of embodiment 1-3 preparation all meets the relevant regulations of " the artificial ceramic grain filter of water treatment ".
Claims (1)
1. the preparation method who is used for the pretreated feedwater sludge ceramsite of micro-polluted water is characterized in that these preparation method's concrete steps are as follows:
(1) preparation feedwater dewatered sludge: with the dewatered sludge of water supply plant water ratio 80wt%, forced air drying 2h under 105 ~ 110 ℃ of conditions obtains the feedwater dewatered sludge of water ratio 52wt%;
(2) raw material crushing and screening: after pulverizing with pulverizer with step (1) gained feedwater dewatered sludge, as the dried rice husk of pore-forming material, cross 100 order motor-vibro screens, obtain particle diameter respectively less than 100 purpose dewatered sludge and powdered rice hulls;
(3) raw material mixes: the prepared dewatered sludge of step (2), powdered rice hulls and flyash are joined to mix mix 30min in the still, make compound, the mass percent of described dewatered sludge, flyash and powdered rice hulls is respectively: 70 ~ 80%, 15 ~ 19% and 1 ~ 5%, and the mass percent of described dewatered sludge, flyash and powdered rice hulls satisfies the requirement that three's sum equals 100%;
(4) granulation: step (3) gained compound is transferred in the tumbling disk granulator, adds the laggard capable granulation of entry, obtain the spherical raw material of particle diameter at 2 ~ 9mm, the quality that adds entry is 5 % of described mixture quality;
(5) spherical raw material drying and roasting: the spherical raw material of step (4) gained are changed in the rotary kiln, dry 60min under 105 ℃, setting the rotary kiln temperature rise rate is 5 ℃/min, and the rotary kiln temperature is raised to 300 ℃ gradually from 105 ℃, at 300 ℃ of lasting roasting 30min; Temperature rises to 500 ℃ from 300 ℃ then, at 500 ℃ of lasting roasting 30min; Temperature rises to 800 ℃ gradually from 500 ℃ then, at 800 ℃ of lasting roasting 30min, finishes sintering process, obtains sintering ceramsite;
(6) discharging cooling: step (5) gained sintering ceramsite is migrated out rotary kiln, naturally cool to room temperature;
(7) screening: the cooled haydite of step (6) gained is sieved, remove substandard product, obtain the haydite finished product of different-grain diameter.
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| CN2011103565062A CN102515834B (en) | 2011-11-11 | 2011-11-11 | Preparation method of waterworks sludge ceramsites for pretreating micro-polluted water |
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| CN110483093B (en) * | 2019-09-11 | 2022-02-08 | 武汉钢铁有限公司 | Comprehensive wastewater sludge-based water retention material for steel plant and preparation method thereof |
| CN110483018A (en) * | 2019-09-24 | 2019-11-22 | 南京路通工程科技有限公司 | A kind of preparation method of bed mud haydite |
| CN111099914B (en) * | 2019-12-31 | 2021-11-12 | 浙江大学 | Sludge-based ceramsite filter material for biological aerated filter, and preparation method and application thereof |
| CN112062593B (en) * | 2020-04-02 | 2023-05-02 | 武汉理工大学 | Novel environment-friendly ceramsite, preparation method thereof and application thereof in wastewater treatment |
| CN112500126A (en) * | 2020-12-02 | 2021-03-16 | 长江勘测规划设计研究有限责任公司 | Preparation method of bottom mud-based zeolite ceramsite conditioned by doping rice hulls |
| CN113292355A (en) * | 2021-04-20 | 2021-08-24 | 广西壮族自治区环境保护科学研究院 | Method for preparing ceramsite by using sludge of sewage treatment plant |
| CN113816763A (en) * | 2021-10-21 | 2021-12-21 | 江苏凯米膜科技股份有限公司 | Biomass sludge ceramsite, preparation method and application |
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