CN103011466A

CN103011466A - Method for removing manganese in sewage

Info

Publication number: CN103011466A
Application number: CN2012105955077A
Authority: CN
Inventors: 万玉山; 李娜; 王莉
Original assignee: Changzhou University
Current assignee: Changzhou University
Priority date: 2012-12-07
Filing date: 2012-12-07
Publication date: 2013-04-03

Abstract

The invention discloses a method for removing manganese in sewage, and belongs to the field of sewage treatment in environment protection. The purpose of removing the manganese is achieved by adding cationic polyacrylamide, an ion precipitation agent and organic alcohol to manganese sewage, stirring and settling the mixture, wherein the ion precipitation agent is alkaline earth, carbonate, hydroxy radical, sulfide and slaked lime; and the organic ketone is acetone, butanone, cyclopentanedione, octanone and cyclohexanone; and the substances are added to sewage containing manganese, of which the pH is 8.5-9.5, and stewed and precipitated after being stirred for 10-30min at the intermediate speed, so as to strike off upper grease pollutants. The method has the characteristics that the method is wide in material source, low in price, small in pharmaceutical dosage, low in operating expense, free of secondary pollution in treatment process, and high in manganese removal rate, and the removal rate can be up to over 99.9%.

Description

A kind of method of removing manganese in the sewage

Technical field

The present invention relates to a kind of method of removing manganese in the sewage, belong to field of waste water treatment in the environment protection.

Background technology

Manganese is a kind of important metallic element, have many uses industrial, be in great demand, be a kind of important raw material in the metallurgical industry, in addition, manganese also is used for the aspects such as non-ferrous metal, chemical industry, medicine, food, analysis and scientific research, mn ion in the waste water can make the people produce the nervosa poisoning, if the not treated water body that directly enters, will by to the pollution of the ecosystems such as water body, soil at the animals and plants cylinder accumulation, destroying food chain directly or indirectly affects human health.

At present, in the Treatment of Wastewater With Manganese field, the most widely used treatment process of engineering is traditional precipitator method, flocculation sedimentation, electrolytic process, iron chipping microelectrolysis.The tradition precipitator method are to utilize the metal ion reaction in oxyhydroxide or sulfide and the waste water to generate the little precipitation of solubility product, thereby remove the metal ion in the waste water.General acid Mn-bearing waste water is through behind the adjust pH, process with the traditional chemical precipitator method, can reach water outlet and contain manganese ion concentration less than 5mg/L, but have the problems such as technique is long, treatment condition are harsh, cost is higher, waste residue is more, introduce secondary pollution, treatment capacity is limited.Flocculent precipitation is to utilize coagulating agent to make to be difficult in the waste water small-particle that precipitates and colloidal solid to take off steady and be gathered into macrobead and precipitate, and realizes the removal of heavy metal ion.There are some researches show, utilize lime one polymerize aluminum chloride to process Electrolytic Manganese Wastewater, pH is controlled at 8.5～10.0, and adding mass concentration is 50mg/L, can make the manganese in the waste water drop to 0.2mg/L by 397mg/L.But flocculation sedimentation need to improve pH is beneficial to sedimentation, and the result can cause water outlet pH more high.Electrolytic process is processed the lower waste water of manganese ion concentration, and to have a clearance high, non-secondary pollution, less energy consumption, the heavy metal recoverable that precipitates changes adaptability to waste water quality stronger, and the reaction times is short, but energy consumption is large when processing a large amount of waste water, and the electrode metal consumption is large, is not suitable for high-concentration waste water.The water that three-dimensional electrolysis technology in the iron chipping microelectrolysis is applicable to high manganese area changes engineering, but micro-electrolysis method normally processes waste water under acidic conditions, causes easily that the iron filings amount of stripping is large or treatment effect is not remarkable.

Summary of the invention

The objective of the invention is for overcoming the deficiencies in the prior art, a kind of method of removing manganese in the sewage is provided, it is extensive that the present invention has raw material sources, cheap, the added amount of chemical less, working cost is low, the treating processes non-secondary pollution, demanganization efficient is high, and clearance can reach 99.9% with first-class characteristics.

The technical solution used in the present invention is: the present invention is by adding cationic polyacrylamide, ionic agent and organic ketone to containing in the manganese sewage, thereby stirring, air supporting reach the purpose of removing manganese.

Described ionic agent is alkaline-earth metal, carbonate, hydroxide radical, sulfide, slaked lime.

Described organic ketone is acetone, butanone, cyclopentanedione, octanone, pimelinketone.

Described alkaline-earth metal is a kind of in calcium, the magnesium.

Described sulfide is a kind of in zinc sulphide, the Iron sulfuret.

The mass percent of each material is respectively: alkaline-earth metal 30-40%, carbonate 20-50%, hydroxide radical 10-40%, sulfide 5-10%, slaked lime 5-15%, acetone 2-6%, butanone 3-8%, cyclopentanedione 3-10%, octanone 1-7%, pimelinketone 2-6%.

Concrete operation step of the present invention is:

(1) gets second pond sewage, add cationic polyacrylamide mud is carried out sedimentation;

(2) in the sewage of sedimentation, add the agent of 10～15ppm ionic and the organic ketone of 20～25ppm, regulate simultaneously pH8.5～9.5;

(3) with mechanical stirring device sewage was stirred 15-30 minute;

(4) sewage after stirring adds 8～10ppm ethyl propionate, restir 10-30 minute;

(5) static, sedimentation is struck off the upper strata grease contamination and is got final product.

The invention has the beneficial effects as follows:

(1) technical process is simple, and running cost is low;

(2) obvious processing effect can obtain removing the sewage of manganese after primary treatment;

(3) treating processes non-secondary pollution, demanganization efficient is high, and clearance can reach more than 99.9%.

Embodiment

Example 1

(1) gets second pond sewage, add cationic polyacrylamide and carry out sludge settling; (2) in the sewage of sedimentation, add 10ppm ionic agent and the organic ketone of 20ppm, wherein alkaline-earth metal 30%, carbonate 30%, hydroxide radical 19%, sulfide 5%, slaked lime 5%, acetone 2%, butanone 3%, cyclopentanedione 3%, octanone 1%, pimelinketone 2% are regulated pH to 8.5 simultaneously; (3) with mechanical stirring device sewage was stirred 15 minutes; (4) sewage after stirring adds 8ppm ethyl propionate, restir 30 minutes; (5) static, the upper strata grease contamination is struck off in sedimentation, can make the manganese in the waste water drop to 0.2mg/L by 397mg/L, and the manganese clearance has reached 99.94%.

Example 2

(1) gets second pond sewage, add cationic polyacrylamide and carry out sludge settling; (2) in the sewage of sedimentation, add 12ppm ionic agent and the organic ketone of 25ppm, wherein alkaline-earth metal 35%, carbonate 32%, hydroxide radical 10%, sulfide 7%, slaked lime 5%, acetone 2%, butanone 3%, cyclopentanedione 3%, octanone 1%, pimelinketone 2% are regulated pH to 9.0 simultaneously; (3) with mechanical stirring device mud was stirred 20 minutes; (4) sewage after stirring adds 9ppm ethyl propionate, restir 20 minutes; (5) static, the upper strata grease contamination is struck off in sedimentation, can make the manganese in the waste water drop to 0.085mg/L by 425mg/L, and the manganese clearance has reached 99.98%.

Example 3

(1) gets second pond mud, add cationic polyacrylamide and carry out sludge settling; (2) in the sewage of sedimentation, add 15ppm ionic agent and the organic ketone of 22ppm, wherein alkaline-earth metal 32%, carbonate 25%, hydroxide radical 12%, sulfide 8%, slaked lime 5%, acetone 5%, butanone 3%, cyclopentanedione 3%, octanone 2%, pimelinketone 5% are regulated pH to 9.5 simultaneously; (3) with mechanical stirring device mud was stirred 30 minutes; (4) sewage after stirring adds 10ppm ethyl propionate, restir 10 minutes; (5) static, the upper strata grease contamination is struck off in sedimentation, can make the manganese in the waste water drop to 0.038mg/L by 378mg/L, and the manganese clearance has reached 99.99%.

Claims

1. method of removing manganese in the sewage is characterized in that:

(1) gets second pond sewage, add cationic polyacrylamide and carry out sludge settling;

(3) with mechanical stirring device sewage was stirred 15-30 minute;

(4) add 8～10ppm ethyl propionate in the sewage after stirring, restir 10-30 minute;

2. a kind of method of removing manganese in the sewage according to claim 1, it is characterized in that: described ionic agent is alkaline-earth metal, bicarbonate radical, hydroxide radical, sulfide, slaked lime; Described organic ketone is acetone, butanone, cyclopentanedione, octanone, pimelinketone.

3. a kind of method of removing manganese in the sewage according to claim 2 is characterized in that: described alkaline-earth metal is a kind of in calcium, the magnesium; Described sulfide is a kind of in zinc sulphide, the Iron sulfuret; Each material proportion of composing is respectively alkaline-earth metal 30-40%, carbonate 20-50%, hydroxide radical 10-40%, sulfide 5-10%, slaked lime 5-15%, acetone 2-6%, butanone 3-8%, cyclopentanedione 3-10%, octanone 1-7%, pimelinketone 2-6% by mass percentage.