CN103159310A - Method for removal of arsenic in water based on polyaluminum chloride - Google Patents
Method for removal of arsenic in water based on polyaluminum chloride Download PDFInfo
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- CN103159310A CN103159310A CN2011104210912A CN201110421091A CN103159310A CN 103159310 A CN103159310 A CN 103159310A CN 2011104210912 A CN2011104210912 A CN 2011104210912A CN 201110421091 A CN201110421091 A CN 201110421091A CN 103159310 A CN103159310 A CN 103159310A
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Abstract
The invention especially relates to a method for removal of trivalent arsenic [As(III)] and pentavalent arsenic [As(V)] in water based on polyaluminum chloride (PACC), belonging to the technical field of treatment of domestic drinking water. According to the invention, PACC containing high content Al13 and active chlorine is used as an agent; the procedures of pre-oxidation and coagulation in a coagulation process for removal of As are integrated into one, so As(III) is oxidized into As(V) for synchronous removal, process flow of water treatment is shortened, As removal efficiency is improved, the method is a novel As removal technology with the advantages of economy, high efficiency, low cost, convenience, fastness and easy operation, As removal efficiency is improved by about 10%, and the method can be easily realized in a project. The invention further provides a method of using the PACC containing high content Al13 and active chlorine as a flocculating agent to realize optimized removal of As(V) in water through coagulation.
Description
Technical field
The invention belongs to the Drinking Water processing technology field, particularly a kind of method of trivalent arsenic (As (III)) and pentavalent arsenic (As (V)) in removal water based on polymerize aluminum chloride (PACC).
Background technology
Arsenic (As) is a kind of element extensively distributed in the earth's crust, and is acknowledged as a kind of poisonous carcinogenic substance.The compound of As has trivalent and two kinds of forms of pentavalent, and toxicity and the mobility of As (III) are larger.Research shows, with AsO
3 3-as (III) ratio existed is with AsO
4 3-the toxicity of the As (V) existed will exceed 60 times.In natural groundwater and surface water, As is mainly with inorganic AsO
3 3-and AsO
4 3-exist.Except coming from the earth's crust, As pollutes also from insecticide factory, glasswork and mine drainage.According to the research of the World Health Organization, as long as a small amount of As occurs in tap water, just be enough to the healthy Occurrence to human body.Long-term drinking, containing the water of As, may cause a series of health problems such as Skin pigmentation, skin keratin, skin carcinoma, bladder cancer, hypertension, cardiovascular and cerebrovascular disease, DPN, diabetes.Therefore, the As in tap water arouses great concern.In view of As, to the significant damage of HUMAN HEALTH and being on the rise of As pollution, 1993, WHO took the lead in the desired value of As in tap water is down to 10 μ m/L by 50 μ m/L.Subsequently, Japan, European Union, the U.S. also are decided to be 10 μ g/L by tap water As standard separately respectively." drinking water sanitary standard " that China is used at present (GB5749-2006) requires the peak concentration of As in tap water must be lower than 10 μ g/L.
In water, the removal technology of As is focus and the difficulties of research both at home and abroad.At present, the As technology of removing both domestic and external roughly has following several: absorption method, ion exchange method, membrane separation process, Coagulation Method etc.Wherein, Coagulation Method is current a kind of the most widely used method except As in industrial and life, and it has with low cost, easy handling, except As efficiency advantages of higher.
At present, coagulation is widely used except aluminum salt flocculant in the As method.Manyly studies confirm that there are a series of hydrolyzation morphologies in aluminium in water, adopt
27the Al magnetic nuclear resonance method detects, and roughly can be divided into monomer aluminium (being mainly aluminium monomer and dimer etc.), Al
13o
4(OH)
24 7+(Al
13) and be difficult to detected aluminium glue body or high polymer.Due to Al
13the form molecular weight is large and total charge is higher, so adsorption bridging and charge neutrality is very capable, and charge neutrality and adsorption bridging are acted synergistically, and has excellent flocculation performance, is considered in coagulation process the most effectively condense-flocculate composition.Al
13form generates except in-situ hydrolysis, also is present in a large number and has certain basicity ([OH
-]/[Al]) polymerize aluminum chloride (PACl) in, form prefabricated Al
13and be the advantage form, high-content Al
13the polymerize aluminum chloride of form shows extremely strong coagulation stability for water samples such as different quality, pH, potential of hydrogen, temperature, thereby has improved the removal effect of As.
As (III) more is difficult to coagulation than As (V) and removes, therefore in actual water treatment procedure, need to first add a certain amount of oxygenant is As (V) by As (III) preoxidation, then the effects such as the absorption by the hydrolysis flco in coagulation process and Mg-Al hydrolysis and coprecipitation are removed.Oxygenant commonly used has hypochlorous acid, ozone, potassium permanganate etc., and wherein hypochlorite is most widely used in practice.
This case contriver has successfully invented a kind of method (ZL 200310121380.6) that has flocculation and the polymerize aluminum chloride (PACC) of disinfection effect concurrently for preparing, the Al that contains high-content due to PACC
13form and reactive chlorine, therefore show the economic benefits and social benefits water treatment usefulness of good flocculation and oxidation/sterilization.The present invention is based on the characteristics of PACC water treatment agent, invent a kind of with low cost, easy handling except the As method, utilize high Al in PACC
13form and active chlorine content, realize that oxidizing, flocculating synchronously removed As (III), thereby and in the regulation and control coagulation process aluminium hydrolyzation morphology improve except As (V) usefulness.
Summary of the invention
One of purpose of the present invention is the pollution for As in underground water and drinking water source, earth's surface, especially toxicity large, be difficult to the As (III) removed, the method for As (III) in a kind of economical and effective, the effective removal water based on polymerize aluminum chloride (PACC) that with low cost, easy to use, oxidizing, flocculating synchronously carries out is provided.
Two of purpose of the present invention is for the As (V) in underground and drinking water source, earth's surface, provides a kind of efficiently by the method for As (V) in the removal water based on polymerize aluminum chloride (PACC) of optimizing coagulation.
In effective removal water that the oxidizing, flocculating related in the present invention synchronously carries out, the method for As (III) mainly comprises two processes: at first As (III) is oxidized to As (V) by reactive chlorine in PACC; Then utilize high Al in PACC
13content (Al
13form content accounts for more than 70% of total aluminium content) effect or control the pH value and generate Al with the monomer aluminium original position regulated and controled in PACC
13and have an effect, form the optimization coagulation to As (V), realize the effective removal to As in water.
The know-why that oxidizing, flocculating involved in the present invention is synchronously effectively removed As in water (III) is: at occurring in nature, As is stable in properties, i.e. As under 4 kinds of states of oxidation
3-, As
0, As
3+and As
5+, As
3-only be present in the Eh environment that Eh is extremely low, be the form of gaseous state hydrogen arsenide, but, in dry minute rareness of occurring in nature, metal A s is rare especially at occurring in nature.As in water body is mainly with inorganic AsO
3 3-and AsO
4 3-exist.In the removal process at As, As (III) is larger than the solvability of As (V), and As (III) is more active and be easy to migration than As (V), to making As (III) more be difficult to remove than As (V).Therefore, at coagulation, except in the As process, usually need preoxidation, As (III) is oxidized to As (V), then remove by coagulation the As (V) generated.At present, most popular oxygenant is hypochlorite, and preoxidation is also referred to as prechlorination.Even there is Fe in water
2+and Mn
2+, and natural organic matter etc. disturbs reductive agent, preoxidation process still can be by the instantaneous As (V) that is oxidized to of As (III).The Al that PACC contains high-content
13form and reactive chlorine, have flocculation and oxidative function concurrently, it is a kind of economic benefits and social benefits water treatment agent, realized As in water (III) is oxidized to the purpose of As (V), As (V) is removed in flocculation simultaneously, and prechlorination and coagulation link are united two into one, and has shortened water treatment process, be the novel except the As technology of a kind of economical and efficient, with low cost, convenient and swift, easy handling, be easy to realize in engineering.
The know-why that optimization coagulation involved in the present invention is removed As (V) is: hydrolytic action occurs in aluminium in water, generate a series of Al-OH monokaryon hydroxo complexes, and under certain condition, the multinuclear hydroxyl complex state changed into by the combination of two above aluminium atoms [is expressed as Al
xo
y(OH)
2n (H
2o)], and further generate aluminum hydroxide precipitate.Al
13form is a kind of representative of polymerizable medium body, because its molecular weight is large and the total charge value is higher, therefore has higher adsorption bridging and the ability of charge neutrality, is considered in the aluminate coagulating process the most effectively condense the flocculation composition.Al in coagulation process
13content is directly proportional to removing As (V) effect, can contain the Al of high level in PACC
13form also can, by regulation and control coagulation pH value in the slightly acidic scope, promote that in PACC, monomer al species converted in-situ forms Al simultaneously
13form, further the enhanced coagulation process, realize the optimization coagulation to As (V).
Based on above-mentioned principle, the present invention proposes based on the relating to As (III) in effective removal water that oxidizing, flocculating synchronously carries out and remove the method for As (V) in water by optimizing coagulation of polymerize aluminum chloride (PACC), thereby provide new technological approaches except As for tap water.
Described PACC adopts the described method of ZL 200310121380.6 patent of invention to be prepared, the aluminum concentration by adjusting electrolytic solution or adjust the weight concentration of reactive chlorine in the PACC that electrolysis time can obtain expectation and the ratio of the weight concentration of aluminium; The length of adjusting electrolysis time can obtain the distribution of different aluminum form and (mainly refer to aluminium monomer and Al
13form accounts for the ratio of total aluminium content) PACC; In addition, can select the polymerize aluminum chloride with certain basicity as electrolytic solution, there is certain content Al
13under the condition of form, adjust electrolysis time, can obtain the ratio of the weight concentration of the weight concentration of reactive chlorine in different PACC and aluminium.
In removal water based on polymerize aluminum chloride (PACC) of the present invention, the method for arsenic comprises following technical scheme:
Contain As (III) in water, to contain high-content Al
13the PACC of form and reactive chlorine, as medicament, is 100 μ g/L according to the As contained in water (III), the weight concentration ratio (Cl of the weight concentration of reactive chlorine and total aluminium in PACC
2/ Al) be 0.1～3, add PACC 1.5～8mg Al/L, then carry out rapid stirring (stir speed (S.S.) is 200～300rpm), carry out afterwards low rate mixing (stir speed (S.S.) is 20～40rpm), quiescent setting (time of general quiescent setting is 30～60 minutes); After above-mentioned processing, can realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and efficiently removes As in water (III), the concentration of water outlet As (III) is lower than the water quality standard of existing Drinking Water.Wherein preferably active chlorine content is 2～6g/L, Al
13form content accounts for 60～90% of total aluminium content.
Contain As (V) in water, to contain high-content Al
13the PACC of form and reactive chlorine is as flocculation agent, according to the As contained in water (V), be 100 μ g/L, add PACC 1.5～8mg Al/L, then carry out rapid stirring (stir speed (S.S.) is 200～300rpm), carry out afterwards low rate mixing (stir speed (S.S.) is 20～40rpm), quiescent setting (time of general quiescent setting is 30～60 minutes), after above-mentioned processing, can realize optimizing coagulation and efficiently remove As in water (V), the concentration of water outlet As (V) is lower than the water quality standard of existing Drinking Water.Preferred Al wherein
13form content accounts for 60～90% of total aluminium content.
Contain As (V) in water, the PACC that the aluminium monomer of usining is main al species is as flocculation agent, according to the As contained in water (V), be 100 μ g/L, add PACC 1.5～8mg Al/L, then carry out rapid stirring (stir speed (S.S.) is 200～300rpm), carry out afterwards low rate mixing (stir speed (S.S.) is 20～40rpm), quiescent setting (time of general quiescent setting is 30～60 minutes), in stirring process soon by adding mineral acid (example hydrochloric acid, sulfuric acid etc.) or mineral alkali (as sodium hydroxide, potassium hydroxide, calcium hydroxide etc.) the pH value of water being controlled is in 5～7 scopes, impel described aluminium monomer in-situ hydrolysis to transform a large amount of Al of generation
13form, can realize optimizing coagulation and efficiently remove As (V), and the concentration of water outlet As (V) is lower than existing Drinking Water water quality standard.Wherein preferably the aluminium monomer accounts for 50～90% of total aluminium content, Al
13form content accounts for 10～30% of total aluminium content.
Contain As (III) and As (V) in water, to contain high-content Al simultaneously
13the PACC of form and reactive chlorine is as medicament, according to the total content of As (III) and As (V), is 100 μ g/L, the weight concentration ratio (Cl of the weight concentration of reactive chlorine and total aluminium in PACC
2/ Al) be 0.1～1.5, add PACC 1.5～8mgAl/L, then carry out rapid stirring (stir speed (S.S.) is 200～300rpm), carry out afterwards low rate mixing (stir speed (S.S.) is 20～40rpm), quiescent setting (time of general quiescent setting is 30～60 minutes); After above-mentioned processing, can realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and efficiently removes As in water (III) and As (V), the concentration of water outlet As (III) and As (V) is lower than the water quality standard of existing Drinking Water.Wherein preferably active chlorine content is 2～4.5g/L, Al
13form content accounts for 60～90% of total aluminium content.
The time of described rapid stirring is 1～3 minute.
The time of described low rate mixing is 10～60 minutes.
Technical characterstic of the present invention is as follows:
(1) Al of the present invention to contain high-content
13the PACC of form and reactive chlorine is as medicament, coagulation is united two into one except preoxidation and coagulation link in As technique, both reached As (III) had been oxidized to the synchronous purpose of removing of As (V), shortened again water treatment technological process, improved except As efficiency, be the novel except the As technology of a kind of economical and efficient, with low cost, convenient and swift, easy handling, and improved 10% left and right except As efficiency, be easy to realize in engineering.
(2) the present invention adopts and has high-content Al
13the PACC of form is as flocculation agent, with low cost, strong adaptability, and efficient stable, except As efficiency is high, more common polymerize aluminum chloride improves more than 10% except the As effect.
(3) the present invention is between 5～7 by the pH value of controlling water, regulates and controls aluminium morphon in PACC and the most effective coagulation composition Al of original position generation
13(can reach more than 70%), thereby the removal efficiency (can improve more than 10%) of raising As.
(4) what the present invention relates to is applicable to take dispersion that As polluted underground water and surface water are water source or centralized tap water purifying except the As method, removes the As (III) in the water outlet after As (III) and As (V) and the concentration of As (V) in water according to method of the present invention and can stablize lower than 10 μ g/L.
Embodiment
The surface water of laboratory autogamy water sample and the underground water of choosing the Hetao area, the with serious pollution Inner Mongol of As and Shangqiu Area, Henan Province is as processing water.
Embodiment 1.
In tap water, add As (III) preparation to become simulated water sample, in water, As is all As (III), and concentration is 100 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 10g/L, reactive chlorine are 2.0g/L, Al
13form content accounts for 80% of total aluminium content.Treatment process is: dosage (take aluminium) is 1.5mg Al/L, and after dispensing, rapid stirring (300rpm) 3 minutes, carry out low rate mixing (40rpm) 60 minutes afterwards, quiescent setting 60 minutes.After above-mentioned processing, can realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and efficiently removes As in water (III), the concentration of water outlet As (III) is lower than the water quality standard of existing Drinking Water.
Embodiment 2.
In tap water, add As (III) preparation to become simulated water sample, in water, As is all As (III), and concentration is 100 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 2g/L, reactive chlorine are 5.0g/L, Al
13form content accounts for 80% of total aluminium content.Treatment process is: dosage (take aluminium) is 8mgAl/L, and after dispensing, rapid stirring (200rpm) 1 minute, carry out low rate mixing (20rpm) 30 minutes afterwards, quiescent setting 30 minutes.After above-mentioned processing, can realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and efficiently removes As in water (III), the concentration of water outlet As (III) is lower than the water quality standard of existing Drinking Water.
Embodiment 3.
In tap water, add As (III) preparation to become simulated water sample, in water, As is all As (III), and concentration is 100 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 4g/L, reactive chlorine are 4.0g/L, Al
13form content accounts for 80% of total aluminium content.Treatment process is: dosage (take aluminium) is 5mgAl/L, and after dispensing, rapid stirring (250rpm) 2 minutes, carry out low rate mixing (30rpm) 10 minutes afterwards, quiescent setting 40 minutes.After above-mentioned processing, can realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and efficiently removes As in water (III), the concentration of water outlet As (III) is lower than the water quality standard of existing Drinking Water.
Embodiment 4.
In tap water, add As (V) preparation to become simulated water sample, in water, As is all As (V), and concentration is 100 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 10g/L, reactive chlorine are 0.2g/L, Al
13form content accounts for 86% of total aluminium content.Treatment process is: dosage (take aluminium) is 1.5mg Al/L, and after dispensing, rapid stirring (300rpm) 3 minutes, carry out low rate mixing (40rpm) 60 minutes afterwards, quiescent setting 60 minutes.After above-mentioned processing, can realize optimizing coagulation and efficiently remove As in water (V), the concentration of water outlet As (V) is lower than the water quality standard of existing Drinking Water.
Embodiment 5.
In tap water, add As (V) preparation to become simulated water sample, in water, As is all As (V), and concentration is 100 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 10g/L, reactive chlorine are 0.5g/L, Al
13form content accounts for 86% of total aluminium content.Treatment process is: dosage (take aluminium) is 8mg Al/L, and after dispensing, rapid stirring (200rpm) 1 minute, carry out low rate mixing (20rpm) 10 minutes afterwards, quiescent setting 30 minutes.After above-mentioned processing, can realize optimizing coagulation and efficiently remove As in water (V), the concentration of water outlet As (V) is lower than the water quality standard of existing Drinking Water.
Embodiment 6.
In tap water, add As (V) preparation to become simulated water sample, in water, As is all As (V), and concentration is 100 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 10g/L, reactive chlorine are 1g/L, Al
13form content accounts for 86% of total aluminium content.Treatment process is: dosage (take aluminium) is 5mgAl/L, and after dispensing, rapid stirring (250rpm) 2 minutes, carry out low rate mixing (25rpm) 30 minutes afterwards, quiescent setting 40 minutes.After above-mentioned processing, can realize optimizing coagulation and efficiently remove As in water (V), the concentration of water outlet As (V) is lower than the water quality standard of existing Drinking Water.
Embodiment 7.
In tap water, add As (V) preparation to become simulated water sample, in water, As is all As (V), and concentration is 100 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 8g/L, reactive chlorine are 0.2g/L, and 70% of al species is the aluminium monomer, and 30% is Al
13form.Treatment process is: dosage (take aluminium) is 2mg Al/L, after dispensing, rapid stirring (300rpm) 3 minutes, carry out afterwards low rate mixing (40rpm) 60 minutes, quiescent setting 60 minutes, pH value by adding mineral acid or mineral alkali to control water in the process of above-mentioned rapid stirring is 6, impels described aluminium monomer in-situ hydrolysis to transform a large amount of generation Al
13form.After above-mentioned processing, can realize optimizing coagulation and efficiently remove As in water (V), the concentration of water outlet As (V) is lower than the water quality standard of existing Drinking Water.
Embodiment 8.
In tap water, add As (V) preparation to become simulated water sample, in water, As is all As (V), and concentration is 100 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 8g/L, reactive chlorine are 0.5g/L, and 70% of al species is the aluminium monomer, and 30% is Al
13form.Treatment process is: dosage (take aluminium) is 8mg Al/L, after dispensing, rapid stirring (200rpm) 1 minute, carry out afterwards low rate mixing (20rpm) 10 minutes, quiescent setting 30 minutes, pH value by adding mineral acid or mineral alkali to control water in the process of above-mentioned rapid stirring is 5, impels described aluminium monomer in-situ hydrolysis to transform a large amount of generation Al
13form.After above-mentioned processing, can realize optimizing coagulation and efficiently remove As in water (V), the concentration of water outlet As (V) is lower than the water quality standard of existing Drinking Water.
Embodiment 9.
In tap water, add As (V) preparation to become simulated water sample, in water, As is all As (V), and concentration is 100 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 8g/L, reactive chlorine are 1g/L, and 70% of al species is the aluminium monomer, and 30% is Al
13form.Treatment process is: dosage (take aluminium) is 5mgAl/L, after dispensing, rapid stirring (250rpm) 2 minutes, carry out afterwards low rate mixing (30rpm) 45 minutes, quiescent setting 45 minutes, pH value by adding mineral acid or mineral alkali to control water in the process of above-mentioned rapid stirring is 7, impels described aluminium monomer in-situ hydrolysis to transform a large amount of generation Al
13form.After above-mentioned processing, can realize optimizing coagulation and efficiently remove As in water (V), the concentration of water outlet As (V) is lower than the water quality standard of existing Drinking Water.
Embodiment 10.
Choose the phreatic water at the underground 50m place of the Hetao area, the Inner Mongol, in water, the starting point concentration of As is: As (III) is 277 μ g/L, and As (V) is 43 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 3g/L, reactive chlorine are 4.5g/L, Al
13form content accounts for 76% of total aluminium content.Treatment process is: dosage (take aluminium) is 24mg Al/L, and after dispensing, rapid stirring (250rpm) 1 minute, carry out low rate mixing (40rpm) 30 minutes afterwards, quiescent setting 45 minutes.After above-mentioned processing, can realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and efficiently removes As in water (III) and As (V), the concentration of water outlet As (III) and As (V) is lower than the water quality standard of existing Drinking Water.
Embodiment 11.
Surface water is taken from the river water of the Shangqiu Area, Henan Province of As pollution.In water, the starting point concentration of As is: As (III) is 10 μ g/L, and As (V) is 278 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 13.5g/L, reactive chlorine are 2g/L, Al
13form content accounts for 75% of total aluminium content.Treatment process is: dosage (take aluminium) is 4.5mg Al/L, and after dispensing, rapid stirring (300rpm) 3 minutes, carry out low rate mixing (20rpm) 10 minutes afterwards, quiescent setting 30 minutes.After above-mentioned processing, can realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and efficiently removes As in water (III) and As (V), the concentration of water outlet As (III) and As (V) is lower than the water quality standard of existing Drinking Water.
Embodiment 12.
In tap water, add As (III) and As (V) preparation to become simulated water sample, As (III) is 50 μ g/L, and As (V) is 50 μ g/L.
Selecting PACC is water treatment agent, and wherein total aluminium content is that 5g/L, reactive chlorine are 3.5g/L, Al
13form content accounts for 78% of total aluminium content.Treatment process is: dosage (take aluminium) is 5mgAl/L, and after dispensing, rapid stirring (200rpm) 2 minutes, carry out low rate mixing (30rpm) 60 minutes afterwards, quiescent setting 60 minutes.After above-mentioned processing, can realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and efficiently removes As in water (III) and As (V), the concentration of water outlet As (III) and As (V) is lower than the water quality standard of existing Drinking Water.
Claims (7)
1. the method for arsenic in the removal water based on polymerize aluminum chloride is characterized in that:
Contain As (III) in water, to contain Al
13the polymerize aluminum chloride of form and reactive chlorine is as medicament, according to the As contained in water (III), be 100 μ g/L, in polymerize aluminum chloride, the weight concentration of reactive chlorine is 0.1～3 with the weight concentration ratio of total aluminium, add polymerize aluminum chloride 1.5～8mg Al/L, then carry out rapid stirring, stir speed (S.S.) is 200～300rpm, carries out afterwards low rate mixing, stir speed (S.S.) is 20～40rpm, quiescent setting; After above-mentioned processing, realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and removes As (III) in water;
Or
Contain As (V) in water, to contain Al
13the polymerize aluminum chloride of form and reactive chlorine is as flocculation agent, according to the As contained in water (V), be 100 μ g/L, add polymerize aluminum chloride 1.5～8mg Al/L, then carry out rapid stirring, stir speed (S.S.) is 200～300rpm, carries out afterwards low rate mixing, stir speed (S.S.) is 20～40rpm, quiescent setting, after above-mentioned processing, realize optimizing coagulation and remove As (V) in water;
Or
Contain As (V) in water, the polymerize aluminum chloride that the aluminium monomer of usining is main al species is as flocculation agent, according to the As contained in water (V), be 100 μ g/L, add polymerize aluminum chloride 1.5～8mg Al/L, then carry out rapid stirring, stir speed (S.S.) is 200～300rpm, carry out afterwards low rate mixing, stir speed (S.S.) is 20～40rpm, quiescent setting, be in 5～7 scopes by adding mineral acid or mineral alkali that the pH value of water is controlled in the process of rapid stirring, impel described aluminium monomer in-situ hydrolysis to transform and generate Al
13form, realize optimizing coagulation and remove As (V);
Or
Contain As (III) and As (V) in water, to contain Al simultaneously
13the polymerize aluminum chloride of form and reactive chlorine is as medicament, total content according to As (III) and As (V) is 100 μ g/L, the weight concentration of the reactive chlorine in polymerize aluminum chloride is 0.1～1.5 with the weight concentration ratio of total aluminium, add polymerize aluminum chloride 1.5～8mgAl/L, then carry out rapid stirring, stir speed (S.S.) is 200～300rpm, carries out afterwards low rate mixing, stir speed (S.S.) is 20～40rpm, quiescent setting; After above-mentioned processing, realize that oxidizing, flocculating synchronously carries out and optimizes coagulation and removes As (III) and As (V) in water.
2. method according to claim 1, it is characterized in that: the time of described rapid stirring is 1～3 minute.
3. method according to claim 1, it is characterized in that: the time of described low rate mixing is 10～60 minutes.
4. method according to claim 1 is characterized in that: the used Al that contains while in processing water, containing As (III)
13the polymerize aluminum chloride of form and reactive chlorine, wherein active chlorine content is 2～6g/L, Al
13form content accounts for 60～90% of total aluminium content.
5. method according to claim 1 is characterized in that: the used Al that contains while in processing water, containing As (V)
13the polymerize aluminum chloride of form and reactive chlorine, wherein Al
13form content accounts for 60～90% of total aluminium content.
6. method according to claim 1 is characterized in that: usedly while in processing water, containing As (V) take the polymerize aluminum chloride that the aluminium monomer is main al species, wherein the aluminium monomer accounts for 50～90% of total aluminium content, Al
13form content accounts for 10～30% of total aluminium content.
7. method according to claim 1 is characterized in that: the used Al that contains while in processing water, containing As (III) and As (V)
13the polymerize aluminum chloride of form and reactive chlorine, wherein active chlorine content is 2～4.5g/L, Al
13form content accounts for 60～90% of total aluminium content.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106699458A (en) * | 2016-12-27 | 2017-05-24 | 贵州大学 | Arsenic-polluted soil remediation fertilizer |
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