CN100438969C - Preparation method and use of Fe-Al compound dephosphorizing absorbent and application thereof - Google Patents

Preparation method and use of Fe-Al compound dephosphorizing absorbent and application thereof Download PDF

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CN100438969C
CN100438969C CNB2006101655557A CN200610165555A CN100438969C CN 100438969 C CN100438969 C CN 100438969C CN B2006101655557 A CNB2006101655557 A CN B2006101655557A CN 200610165555 A CN200610165555 A CN 200610165555A CN 100438969 C CN100438969 C CN 100438969C
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China
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adsorption
water
dephosphorization
dephosphorizing
absorbent
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CNB2006101655557A
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Chinese (zh)
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CN1994550A (en
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杨艳玲
李星
范茜
彭永臻
李圭白
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北京工业大学
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Abstract

The invention relates to a method for preparing composite ferro-aluminum dephosphorize absorber, and relative application, wherein said method comprises that: mixing FeCI3 and AICI3 solutions; adding NaOH solution, while their mol ration is 3:2:14; laying and filtering out the product; washing with water until the water outlet is neutral; drying at 100-110Deg. C to prepare the particle absorber. And relative application comprises that: adding adsorption dephosphorize technique into the general water treatment, while said technique is formed by 2-4 serial dephosphorize adsorption pools whose structure are same as filter pools; and using particle composite ferro-aluminum dephosphorize absorber as filter material while its diameter is 0.5-0.8mm, the thickness of adsorption is 1. 0-1. 5m, the load of adsorption pool is 5m/h-8m/h, and the empty bed contact time is 30-40min. The inventive absorber has wide application, simple regeneration and low cost.

Description

The preparation method of Fe-Al compound dephosphorizing absorbent and application thereof
Technical field
The invention belongs to field of environment protection, particularly a kind of adsorption and dephosphorization technology at drinking water resource and municipal sewage plant's discharge water.
Background technology
Owing to the key effect of phosphorus to microbial reproduction and growth, countries in the world are all paid attention to especially for the phosphorus content in the control water body in recent years.There are some researches show, phosphorus is one of element that in the pipe network system microbial re-growth is had the significant limitation effect, for most of water quality, when total phosphorus concentration is lower than 1 μ g/l, phosphorus will become the restriction factor of growth of microorganism in the water, therefore in giving water treatment, reduce the phosphorus content in the water outlet as much as possible, significant to guaranteeing water hygiene safety.In addition owing to the nitrogen that enters in the water body; the water body oxygen enrichment phenomenon that nutriments such as phosphorus too much cause has become the environmental problem that the whole world is paid close attention to; studies show that; the governing factor of most eutrophication waters is a phosphorus; reduce the generation that phosphorus content in the sewage disposal plant effluent can effectively prevent receiving water body eutrophication phenomenon as far as possible; therefore waste water dephosphorization is most important to the protection water environment; in fact, all the phosphate content in the sewage effluent is made explicit provisions as far back as " integrated wastewater discharge standard (GB8978-88) " of country's formulation in 1988 and " integrated wastewater discharge standard (GB8978-1996) " of the new revision of country in 1996.
At present the phosphorus removing method in the water treatment is more, and that adopts usually has bioanalysis and a chemical method.Wherein the bioanalysis dephosphorization is based on the principle of biting the picked-up of phosphorus bacterium and discharging phosphorus, realize dephosphorization by aerobic-anaerobism alternate run, this method has that operating cost is low can remove the advantage that organic matter dyes thing in the water simultaneously, shortcoming is that the technology operation stability is poor, the operation strictness, influenced by wastewater temperature and acid-base value, strong to organic concentration dependence in the water, organic concentration is low in water, when phosphorus content is high, be difficult to satisfy the discharge standard of phosphorus, and lower to source water phosphorus content in the water treatment, be generally below the 100 μ g/l, also be difficult to carry out traditional bioanalysis dephosphorization.The chemical method dephosphorization mainly refers to use molysite, the metal ion of generations such as aluminium salt and lime and phosphate radical generate the sedimentary method of the difficultly-soluble phosphates middle phosphorus that dewaters of making a return journey, this method is reliable, can reach higher dephosphorizing rate, but this process is a precipitation-dissolution equilibrium course of reaction, in order to reach higher dephosphorizing rate, especially phosphorus content is extremely low in the water supply source, in order to reach the calcium phosphate precipitation condition, need add higher precipitation by metallic ion agent, cause medicament expense significantly to improve thus, the residual metal ion concentration improves in the water outlet simultaneously, colourity increases, the sludge moisture content of Chan Shenging is big in addition, is difficult to handle, and causes secondary pollution easily.The common drawback of bioanalysis and chemical method dephosphorization is all can not carry out phosphorus to reclaim in addition.
The absorption method dephosphorization is the bigger serface that utilizes adsorbent to provide, adhere to absorption, ion-exchange or surface precipitation process by phosphorus at adsorbent surface, phosphorus is separated from water, utilize the absorption-desorption method, can realize eliminating in the waste water phosphorus pollute reclaim phosphor resource simultaneously, purpose turns waste into wealth, thereby the absorption method dephosphorization is developed in field of waste water treatment, polytype adsorbent has appearred, wherein activated alumina is traditional adsorbent, use wider at present, but adsorption capacity is not high enough, and the cycle of operation is also shorter.The absorption method dephosphorization is as a kind of efficient low-consume method of removing specific solute from low concentration solution in addition; be more suitable for the removal of trace phosphorus in drinking water; yet since for a long time in the drinking water effect of phosphorus fully realized and paid attention to; not can with the water quality of drinking water; especially the biological stability of drinking water is associated; thereby report is not arranged always about the method that underwater trace phosphorus is removed in absorption; there is a great difference the dephosphorization requirement of drinking water and sewage aspect in addition; particularly the difference aspect limited content is very big; the dephosphorization adsorbent that may adopt also is subjected to the very big constraint of water treatment technology and water quality requirement in addition, and therefore research and development has the water treatment dephosphorization adsorbent of broad applicability to the protection water environment; it is all significant to improve water supply security.
Summary of the invention:
The present invention is from the angle of protection water environment, raising water supply security, succeed in developing a kind of Fe-Al compound dephosphorizing absorbent that is applicable to drinking water treatment and municipal sewage treatment simultaneously, adopt Fe-Al compound dephosphorizing absorbent, to the drinking water source water treatment, can obtain deep phosphorous removal, simultaneously index of correlation meets the Drinking Water of national drinking water standard (GB5749-1985) and Ministry of Public Health's " Drinking Water hygienic practice " (defending the method prison sends out [2001] No. 161); Discharge water to the municipal sewage plant is handled, and the water outlet index of correlation can satisfy the requirement of " integrated wastewater discharge standard (GB8978-1996) ".
The technical solution adopted in the present invention is as follows for achieving the above object:
1, the preparation method of a kind of Fe-Al compound dephosphorizing absorbent provided by the invention is characterized in that:
Taking by weighing raw material is FeCl 3, AlCl 3And NaOH, three's mol ratio is 3: 2: 14; Be made into the aqueous solution, FeCl 3, and AlCl 3Solution fully mixes the back and adds NaOH solution, fully hybrid reaction and leave standstill after leach product, water cyclic washing product to water outlet be a neutrality; Under 100-110 ℃, dry and make the uniform granulated sorbent of size.
2, the application of a kind of Fe-Al compound dephosphorizing absorbent provided by the invention is characterized in that:
In conventional water treatment process, set up adsorption and dephosphorization technology, adsorption and dephosphorization technology is made up of the dephosphorization adsorption tank of 2-4 series operation, each dephosphorization adsorption tank is constructed same filter tank, different is to adopt above-mentioned granular Fe-Al compound dephosphorizing absorbent to make filtrate, and the adsorbent particle size range adopts 0.5mm-0.8mm, and adsorbent layer thickness is 1.0-1.5m, boulder bed and drainage system are established with the filter tank in the adsorption layer bottom, so that backwash regularly, adsorption tank hydraulic load 5m/h-8m/h, empty bench grafting touches time 30-40min.
3, the renovation process of Fe-Al compound dephosphorizing absorbent:
After adsorbents adsorb phosphorus is saturated, can adopt aluminum sulfate solution regeneration, recover its adsorption and dephosphorization performance.
Advantage of the present invention:
1, the Fe-Al compound dephosphorizing absorbent dephosphorization is applied widely, both has been applicable to the removal to trace phosphorus in the water treatment, is applicable to the removal and the recovery of constant phosphorus in the wastewater treatment again;
2, depollution usefulness excellence can be when finishing dephosphorization function, and further the fortified water treatment process is to the removal effect of turbid matter and organic pollution;
3, the Fe-Al compound dephosphorizing absorbent renovation process is simple, easy operating;
4, the raw material of production Fe-Al compound dephosphorizing absorbent and regenerative agent aluminum sulfate are the conventional water treatment medicament of giving, and cost of material is low, be easy to get, and safe in utilization, have no side effect;
The specific embodiment:
Taking by weighing raw material is FeCl 3,, AlCl 3And NaOH, three's mol ratio is 3: 2: 14; With FeCl 3, and AlCl 3Solution fully mixes the back and adds NaOH solution, fully hybrid reaction and leave standstill after leach product, water cyclic washing product to water outlet be a neutrality; Above-mentioned product is dried and makes the uniform granulated sorbent of size under 100-110 ℃.
The present invention carries out in the laboratory, below by example the present invention is elaborated.The adsorbent particle size range adopts 0.5mm-0.8mm,
Embodiment 1: certain water supply plant is the water source with contaminated river, and former water total phosphorus is 125ug/L, and dissolved phosphorus is 86ug/L, turbidity 10.5NTU, COD Mn5.6mg/L.In the experiment, under stirring fast, add the conventional aluminum sulfate coagulant of 13mg/L, through mixing, reaction, precipitation and after filtering, delivery turbidity 1.0NTU, COD Mn2.4mg/L other indexs have also reached the standard of GB5749-1985, but total phosphorus 7.5ug/L, dissolved phosphorus 5.2ug/L, the requirement that does not reach the effluent quality Biostatic.To filter the back water outlet and carry out the adsorption and dephosphorization processing, adsorption and dephosphorization technology is made up of the dephosphorization adsorption tank of 3 series operations, and adsorbent layer thickness is 1.0m, adsorption tank hydraulic load 6m/h, and empty bench grafting touches time 30min.After testing, adsorption tank delivery turbidity, total phosphorus and dissolved phosphorus all do not detect, COD Mn0.6mg/L water outlet is the drinking water of Biostatic.
Embodiment 2: certain water supply plant is the water source with contaminated reservoir water, and former water total phosphorus is 87ug/L, and dissolved phosphorus is 54ug/L, turbidity 8.5NTU, COD Mn3.4mg/L.In the experiment, under stirring fast, add 10mg/L coagulant polymeric aluminium, through mixing, reaction, precipitation and after filtering, delivery turbidity 0.2NTU, COD Mn0.8mg/L other indexs have also reached the standard of GB5749-1985, but total phosphorus 4.5ug/L, dissolved phosphorus 4.2ug/L, the requirement that does not reach the effluent quality Biostatic.To filter the back water outlet and carry out the adsorption and dephosphorization processing, adsorption and dephosphorization technology is made up of the dephosphorization adsorption tank of 2 series operations, and adsorbent layer thickness is 1.5m, adsorption tank hydraulic load 6m/h, and empty bench grafting touches time 35min.After testing, adsorption tank delivery turbidity, total phosphorus and dissolved phosphorus all do not detect, COD Mn0.5mg/L water outlet is the drinking water of Biostatic.
Embodiment 3: certain water supply plant is the water source with river, the face of land water that is subjected to sanitary sewage and industrial wastewater pollution, and former water total phosphorus is 186ug/L, and dissolved phosphorus is 150ug/L, turbidity 8.5NTU, COD Mn6.4mg/L.In the experiment, under stirring fast, add 14mg/L coagulant polymeric aluminium, through mixing, reaction, precipitation and after filtering, delivery turbidity 1.0NTU, COD Mn2.8mg/L other indexs have reached the standard of GB5749-1985, but total phosphorus 22.5ug/L, dissolved phosphorus 14.2ug/L, the requirement that does not reach the effluent quality Biostatic.To filter the back water outlet and feed adsorption and dephosphorization technology, adsorption and dephosphorization technology is made up of the dephosphorization adsorption tank of 4 series operations, and adsorbent layer thickness is 1.3m, adsorption tank hydraulic load 8m/h, and empty bench grafting touches time 40min.After testing, adsorption tank delivery turbidity 0.2NTU, total phosphorus and dissolved phosphorus all do not detect COD Mn0.8mg/L water outlet is the drinking water of Biostatic.
Embodiment 4: the water outlet after certain sewage treatment plant's desire will be handled enters GB3838-88 (ground water environment quality standard) IV class waters, need to satisfy the secondary standard of " integrated wastewater discharge standard (GB8978-1996) ", total phosphorus content is 1470ug/L in its secondary treatment yielding water, does not reach emission request.This secondary effluent from sewage treatment plant of adsorption and dephosphorization PROCESS FOR TREATMENT that employing is made up of the dephosphorization adsorption tank of 4 series operations, adsorbent layer thickness is 1.0m, adsorption tank hydraulic load 8m/h, empty bench grafting touches time 30min, adsorption tank water outlet total phosphorus drops to 680ug/L, and other indexs also reach the secondary standard of " integrated wastewater discharge standard (GB8978-1996) ".
Embodiment 5: the water outlet after certain sewage treatment plant's desire will be handled enters GB3838-88 (ground water environment quality standard) III class waters, need to satisfy the primary standard of " integrated wastewater discharge standard (GB8978-1996) ", total phosphorus content is 1800ug/L in its secondary treatment yielding water, does not reach emission request.This secondary effluent from sewage treatment plant of adsorption and dephosphorization PROCESS FOR TREATMENT that employing is made up of the dephosphorization adsorption tank of 4 series operations, adsorbent layer thickness is 1.3m, adsorption tank hydraulic load 8m/h, empty bench grafting touches time 40min, adsorption tank water outlet total phosphorus drops to 380ug/L, and other indexs also reach the primary standard of " integrated wastewater discharge standard (GB8978-1996) ".

Claims (2)

1, a kind of preparation method of Fe-Al compound dephosphorizing absorbent is characterized in that, may further comprise the steps:
1) takes by weighing raw material FeCl 3, AlCl 3And NaOH, three's mol ratio is 3: 2: 14;
2) three kinds of raw materials are made into the aqueous solution, FeCl respectively 3And AlCl 3Solution fully mixes the back and adds NaOH solution, fully hybrid reaction and leave standstill after leach product, water cyclic washing product to water outlet be a neutrality;
3) above-mentioned product is dried and makes the uniform granulated sorbent of size under 100-110 ℃.
2, the application of the Fe-Al compound dephosphorizing absorbent prepared of method according to claim 1 is characterized in that:
In conventional water treatment process, set up adsorption and dephosphorization technology, adsorption and dephosphorization technology is made up of the dephosphorization adsorption tank of 2-4 series operation, each dephosphorization adsorption tank is constructed same filter tank, adopt granular Fe-Al compound dephosphorizing absorbent to make filtrate, the adsorbent particle size range adopts 0.5mm-0.8mm, adsorbent layer thickness is 1.0-1.5m, adsorption tank hydraulic load 5m/h-8m/h, and empty bench grafting touches time 30-40min.
CNB2006101655557A 2006-12-21 2006-12-21 Preparation method and use of Fe-Al compound dephosphorizing absorbent and application thereof CN100438969C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101507911B (en) * 2008-11-11 2011-06-29 中国科学院生态环境研究中心 Defluorination absorbing material based on aluminum base composite oxides and its preparation method and use and special device of the preparation method
CN104707560A (en) * 2015-03-09 2015-06-17 云南大学 Preparation method of modified mesopore TiO2 capable of effectively removing phosphorus in wastewater
CN106861605A (en) * 2017-03-31 2017-06-20 四川农业大学 Activated carbon supported nanometer Fe Al(Hydrogen)The preparation method and applications of oxide particle composites

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86104833A (en) * 1986-07-11 1987-04-22 张鸿儒 The production method of Method of high accumulative aluminium-ferric flocculant
CN1036708A (en) * 1989-03-28 1989-11-01 陈光彦 A kind of production method of coagulant for clarifying water
JP2000342960A (en) * 1999-06-08 2000-12-12 Nikko Co Dephosphorization agent and manufacture of the same
CN1609016A (en) * 2004-11-19 2005-04-27 宋乾武 Nitrogen and phosphorus removing process
CN1669956A (en) * 2004-03-18 2005-09-21 昆明柯利欣环保科技有限公司 High efficiency sewage treatment method
CN2816015Y (en) * 2005-03-24 2006-09-13 欧亚华都(宜兴)环保有限公司 Intermediate water reulitization apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86104833A (en) * 1986-07-11 1987-04-22 张鸿儒 The production method of Method of high accumulative aluminium-ferric flocculant
CN1036708A (en) * 1989-03-28 1989-11-01 陈光彦 A kind of production method of coagulant for clarifying water
JP2000342960A (en) * 1999-06-08 2000-12-12 Nikko Co Dephosphorization agent and manufacture of the same
CN1669956A (en) * 2004-03-18 2005-09-21 昆明柯利欣环保科技有限公司 High efficiency sewage treatment method
CN1609016A (en) * 2004-11-19 2005-04-27 宋乾武 Nitrogen and phosphorus removing process
CN2816015Y (en) * 2005-03-24 2006-09-13 欧亚华都(宜兴)环保有限公司 Intermediate water reulitization apparatus

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