CN103373755A - Formula and preparation method of inorganic coagulant capable of simultaneously removing nitrogen, phosphorus and algae - Google Patents

Abstract

The invention relates to a formula and preparation method of inorganic coagulant capable of simultaneously removing nitrogen, phosphorus and algae. A coagulation water purifier which can remove algae and also can efficiently remove nitrogen and phosphorus can be obtained by compounding two common commercially available aluminium polychlorid (PaCl) and aluminum sulfate (Alum) with modified zeolite.

Description

A kind of simultaneously denitrogenation dephosphorizing is except algae inorganic type coagulating agent prescription and compound method

Technical field

The present invention relates to a kind of simultaneously high-efficient denitrification and dephosphorization except prescription composition and the compound method of the inorganic polymer coagulant of algae; specifically namely adopt two all common commercially available coagulant polymeric aluminium chlorides (PACl) and Tai-Ace S 150 (Alum) and modified zeolite to carry out compound; obtain a kind of coagulation water purification agent that can also can efficiently remove simultaneously except algae the nitrogen phosphoric, belong to the technical field of water pollution control of environmental protection technology.

Background technology

The quick eutrophication of present Chinese Different Waters is one of the most typical feature that produces in the Chinese Rapid-Urbanization evolution, and the result of eutrophication and characteristic features are exactly the amount reproduction of algae, cause rapid deterioration even the forfeiture of function of water body.City appearance water body is present in the whole nation each cities and towns and residential quarter at present in a large number, though single water body small volume, cumulative volume is still huge, and nearly all landscape water body affects by serious eutrophication all, the algal bloom growth.The means of administering at present be that short-term is met an urgent need and long-acting improvement is carried out simultaneously, and quick, the most most economical means are exactly alga removalby coagulation [1] in the short-term emergency method, at present existing relevant large quantity research.Wherein, mainly be divided into traditional coagulating agent (comprise poly-silicon type coagulating agent [2]) except algae characteristic and rule research [3-6], compound coagulant exploitation and its are except the algae characteristic research, [7] are studied in the couplings of coagulation and other techniques etc.; Also has in addition the compound coagulant research [8] of Nano type material, and comparatively active be the research [9] of related compound coagulating agent, comprising the clay that adopts mineral-type or the recombiner [10-13] of modified clay or zeolites, the organic polymer recombiner [14-16] of synthetic, the recombiner [17 of chemical oxide, 18], [10,19] such as recombiners of chitosan class biotype; Next is the research of combination process, comprising with the application of filtering the techniques such as (sand filtration, ultrafiltration etc.) [20], air supporting [21,22], ozone [23], charcoal absorption [24].In addition, the physical property such as electrochemical coagulation and ultrasonic coagulation process means is also progressively carried out [25-27].About the complex class coagulating agent respectively there be excellent lacking, can remove the algae effect by killing the frustule raising such as oxygenant, but cause easily the release [17] of material in algae toxin and the frustule; The biotype recombiner is natural non-secondary pollution type material, but may improve water body dissolved organic carbon content [10]; Combination process is an effective way that improves except algae usefulness, excellent lacking is also respectively arranged certainly, or increase cost such as adsorption filtration, air supporting etc., or discharge easily material such as ozonation technology [7,28] in the frustule.Yet, no matter be the research of compound coagulant or the research and development of combination process, at present for the research of the removal characteristic of alga removalby coagulation Nitrogen During (N) element and rule relative shortage also, the overwhelming majority also is removal feature and the rule [29-36] of removing to investigate N from the angle of water treatment plant technique, investigates specially the research few [32] that coagulation is removed soluble organic nitrogen (DON); So the basic research content aspects such as present essential characteristic for coagulation removal DON, influence factor are all in urgent need of strengthening, particularly also very are short of for the simultaneously development except related productss such as algae coagulating agent of high-efficient denitrification and dephosphorization.

Reference:

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Summary of the invention

The object of the present invention is to provide a kind of prescription and compound method except the algae coagulating agent of simultaneously high-efficient denitrification and dephosphorization, and be convenient to scale operation and application.

It is simple and easy compound namely to adopt two all common commercially available coagulant polymeric aluminium chlorides (PAC) and Tai-Ace S 150 (Alum) and modified zeolite to carry out, and obtains a kind of coagulation water purification agent that can also can efficiently remove simultaneously except algae the nitrogen phosphoric, and concrete steps are as follows:

At first according to literature method preparation polymerize aluminum chloride (PACl), basicity is 1.0 ~ 2.0(Wang Dong liter, Tang Hongxiao, Gao Qiong, Shao Jingli; The preliminary study [J] of Al_ (13) form fractionation purification process; Environmental chemistry; 05 phase in 2000), concentration is 0.5 ~ 1 mol/L.Other various chemical agents such as Tai-Ace S 150 (Alum), iron(ic) chloride (FeCl ₃), hydrochloric acid, sodium hydroxide etc. are the analytical reagent that traditional Chinese medicines group produces.Concentration after PACl and Alum are compound is 0.5 ~ 1 mol/L all with the Al molar concentration meter.Hydrochloric acid and sodium hydroxide are used for the preset soda acid, and as required, concentration is formulated as 1 mol/L.

The preparation of compound coagulant: adopt the direct combination method, compositely proportional (PACl: Alum) be 1:1 ~ 0.5:1, method is under 25 ± 5 ℃ of the constant temperature, and these two kinds of 0.5 ~ 0.1mol/L coagulated agents are simultaneously by the amount such as two peristaltic pumps (little) constant speed (input third party's mixing vessel and constantly continue to mix under 1 ~ 5mL/min) condition.

Zeolite modifying method: acid (HCl) modification take every 5g zeolite as a mass unit, is to process 24h among the 0.3mol/L HCl in 100mL concentration under the room temperature, be washed till neutrality with distilled water, at room temperature constant temperature oscillation 30min (30 ℃, 200rpm), after cleaning in 105 ℃ of lower dry 2h.The zeolite particle diameter all is the 40-80 order, 180-380 μ m.

Embodiment

During use, first toward containing above-mentioned [0007] modified zeolite that adds (200 ± 40) mg/L in the algae pollution water body, fully stir 3 ~ 5 minutes (150r/min), then the abundant coagulation of compound coagulant quick (300r/min) that adds [0006] stirred 1 minute, and then stir slowly 15min with 50r/min, behind the last standing sedimentation 30min, the solution supernatant liquor is purifying waste water after the processing.For general eutrophication water (TN〉2.5 mg/L, TP〉0.5 mg/L, concentration of algae number 1.0-3.0 * 10 ⁶Individual/L) effect is, and nitrogen removal rate can reach 70-80%, and total tp removal rate can reach 60-75%, and alga-killing rate can reach 90%.

Claims (3)

1. One kind simultaneously denitrogenation dephosphorizing except prescription and the compound method of the inorganic type coagulating agent of algae, it is characterized in that with polymerize aluminum chloride (PACl) solution of basicity (1.0-2.0) (0.5 ~ 1mol/L) with Tai-Ace S 150 (Alum) solution (0.5 ~ 1mol/L) the ratio direct combination in 0.5:1 ~ 1:1 cooperates the use of modified zeolite before use.
2. Complex method be need to be under 25 ± 5 degrees centigrade of constant temperature (1 ~ 5mL/min) is delivered to two kinds of coagulant solutions simultaneously in third party's container and constantly with equipment such as peristaltic pumps and stirs under micro-constant speed simultaneously.
3. 3. the preparation method of modified zeolite then is every 5g zeolite, is to process 24h among the 0.3mol/L HCl in 100mL concentration under the room temperature, is washed till neutrality with distilled water, at room temperature constant temperature oscillation 30min (30 ℃, 200rpm), after cleaning in 105 ℃ of lower dry 2h.