JPS6238208A - Waste water treatment agent - Google Patents

Abstract

PURPOSE:To remove almost oil content of oil-drop-in-water type emulsion and minimize the formation of scum by utilizing the waste water treatment agent having salt shown by the special constitutional formula as main component. CONSTITUTION:Salt shown by the following general formula (in the formula, R<1> is any one of alkyl radical, alkenyl radical, alalkyl radical, phenyl radical or cycloalkyl radical each with 6-20C, R<2> and R<3> are alkyl radical or alkenyl radical having hydrogen or 1-20C, and X is carboxylic acid or oxyacid) is used as waste water treatment agent under 100-1,000ppm, pH9 against waste water. The treatment agent is produced by neutralization reaction of primary, secondary, and tertiary amine on carboxylic acid and oxyacid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wastewater treatment agent, particularly a novel wastewater treatment agent having the ability to separate oil and water from an oil-in-water emulsion.

[Prior Art] Currently, in the field of metal processing, the use of water-soluble cutting oils is increasing year by year due to their advantages such as non-flammability and non-stick properties. However, it cannot be said that the treatment of these wastewaters has been completed yet.

Currently, treatment is performed using a combination of inorganic flocculants such as sulfuric acid or polyaluminum chloride and nonionic polymer flocculants, but a single treatment does not provide sufficient effect, and two
The same operation must be repeated ~3 times. Therefore, the scum collected in this way has many skewers, and since the residue after removing the oil in the scum is an inorganic substance, the treatment after combustion has become a new problem. In addition, part of the treatment is carried out by membrane treatment such as ultrafiltration membrane method, but wastewater contains a lot of oil as it is and the performance of the membrane deteriorates in a short period of time, so it is necessary to remove as much oil as possible from wastewater before membrane treatment. It is hoped that

In addition to such cutting oil wastewater, wastewater such as rolling oil discharged from the rolling process similarly has a large amount of fine oil dispersed therein, and has similar problems. In addition, bilge water and ballast water discharged from ships as an oil-in-water emulsion may be contaminated with detergents used for cleaning machinery, parts, etc., and cannot be treated with current separators. .

[Problems to be Solved by the Invention] The present inventors have conducted extensive research in order to create a processing agent that can remove most of the oil content in such oil-in-water emulsions and that produces less scum. As a result, they discovered that by simply adding a small amount of a certain compound to wastewater and stirring it, the oil in the water floats to the surface and can be efficiently separated and recovered.Based on this knowledge, the present invention was completed.

An object of the present invention is to provide a novel wastewater treatment agent containing a salt represented by the following general formula as a main component.

R' R2R3N-X (wherein R1 is necessarily an argyl group, an alkenyl group, an aralkyl group, a phenyl group, or an alkyl group having 6 to 20 carbon atoms, and R and R3 are hydrogen or alkyl having 1 to 20 carbon atoms. group, alkenyl group, and X represents a carbonic acid or an oxyacid. an alkyl group which may have a group,
It is an alkenyl group, an aralkyl group, a phenyl group or a cycloalkyl group. Such groups include alkyl groups such as octyl, decyl, undecyl, lauryl, 1-lysosyl, myristyl, palmityl, and stearyl, alkenyl groups such as dodecenyl, oleyl, and lylyl, benzyl, phenethyl, phenylpropyl, phenylbutyl,
Examples include aralkyl groups such as phenyl octyl, phenyl cetyl and phenyl octadecyl, allyl groups such as phenyl and naphthyl, and alkyl groups such as cyclohexyl. In addition, R and σR3 are hydrogen or carbon atoms 1 to 20
is an alkyl group or an alkenyl group. Such groups include methyl, ethyl, propyl, butyl, hexyl,
Examples include alkyl groups such as 2-ethylhexyl, octyl, decyl, lauryl, myristyl, valmidyl, and stearyl, and alkenyl groups such as ethynyl, aryl, undecenyl, oleyl, and lylunyl.

Examples of carboxylic acids include acetic acid, propionic acid, butyric acid, caproic acid, caprylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, benzoic acid, etc.
divalent carboxylic acids, oxalic acid, malonic acid, succinic acid, adipic acid, divalent carboxylic acids such as phthalic acid, hemimelitic acid,
Trivalent carboxylic acids such as trimellitic acid, butante-1-la carboxylic acid, pyromellitic acid, tetravalent carboxylic acids such as ethylenediaminetetraacetic acid, acrylic acid polymers, acrylic acid copolymers, methacrylic acid polymers, methacrylic acid Copolymers, polymers of acrylic acid and methacrylic acid esters, partially saponified products of copolymers, etc. are useful, and partially esterified products thereof are also exemplified.

Examples of the oxyacid include glycolic acid, lactic acid, malic acid, tartaric acid, citric acid, gluconic acid, oxybenzoic acid, salicylic acid, and the like.

The processing agent according to the present invention can be easily raised to I by, for example, a normal neutralization reaction between a primary, secondary, or tertiary amine and a carboxylic acid or oxyacid. Specifically, in the case of a liquid acid, it is poured into the amine as it is, and in the case of a solid acid, it is dissolved in water in advance, and an amount to achieve a predetermined equivalent ratio is added and stirred. If a gel forms, it may be heated at 50°C or higher.

An effective equivalent mixing ratio of amine and carboxylic acid or oxyacid is 115 to 5/1, preferably 1/2 to 2.
/1. If it is used outside this range, the performance will be significantly reduced and the amount of processing agent required will increase, resulting in an economic disadvantage.

The compounds according to the present invention may be used in combination of two or more kinds,
Other compounds, such as alkylene oxide adducts of alcohols, alkylene oxide adducts of alkylphenols, copolymers of ethylene oxide, propylene oxide, etc., nonionic surfactants such as alkylamine oxides,
Containing amphoteric active agents such as alkyl betaine and alkyl propyl betaine, alcohols such as methanol, ethanol, propatool, butanol, 2-ethylhexanol, and oleyl alcohol, and solvents such as methyl cellosolve, ethyl cellosolve, butyl cellosolve, and phenyl cellosolve. Can be done. However, since all of these compounds increase the COD of wastewater, the amount added should be the minimum necessary to maintain the fluidity of the treatment agent.

The wastewater treatment agent according to the present invention is preferably used in liquid form, and the amount added varies depending on the wastewater, but usually 100 to 11,000 ppm to the wastewater is sufficient.

Use of the processing agent according to the present invention 1) H is preferably 9 or less,
It is usually adjusted with mineral acids such as hydrochloric acid and sulfuric acid.

Outside this range, the oil/water separation ability is significantly reduced.

The recommended method of use is to add the compound at room temperature, stir it, bring the oil dispersed in the water to the surface, and remove the oil with a skimmer, etc., or add water to the bottom layer. , the oil will overflow and be collected. Furthermore, in order to speed up the floating of oil, it is effective to add an inorganic salt such as calcium chloride or magnesium chloride, or to heat it to 50 to 70°C.

The compound according to the present invention has an excellent oil-water separation ability, and it is easy to recover processed materials and regenerate oil, and it is possible to easily recover cutting oil wastewater,
It can be applied to various types of wastewater such as rolling oil wastewater, bilge water, and ballast water, especially oil-in-water emulsion type wastewater.

U example The present invention will be explained in detail below with reference to Examples.

Example 1 Cutting oil wastewater A (turbidity: 1, OO
Oppm or more, COD: 10.7001)I)m
) to 1003, add 500 ppm of various processing agents,
The mixture was stirred lightly using a Nori-Ras rod, and the turbidity and COD were measured after 5 hours. The table shows the results of one test using no processing agent as a blank. In addition, turbidity is calculated from the transmittance corresponding to kaolin:% warm solution as a standard solution, and COD is calculated from JI
It was obtained in accordance with S K ○102.

Example 2 Cutting oil wastewater B (turbidity: i, oo
oppm or more, COD: 42,500t)Dm)
1009 was added, 500 ppm of various processing agents and 500 pan of calcium chloride were added, heated to 50°C, stirred lightly with a glass rod, and measured for turbidity and COD after 2 hours. The results obtained are shown in the table, with no treatment agent added as a blank.

Example 3 Rolling oil wastewater (turbidity: 1.000 p
prn or more, COD: 12,600t) DI>1009, add 500 ppm of various processing agents, 50
The mixture was heated to 'C and stirred lightly with a glass rod, and the turbidity and COD were measured after 2 hours. The results obtained are shown in the table, with no treatment agent added as a blank.

Example 4 Bilge water A (turbidity: 1, OOOp
pm or more, COD 21.320pf) m) 100g
After adding ``+ooppm'' of various treatment agents, the mixture was lightly stirred with a glass rod, and the turbidity and COD after 5 hours were measured.The results obtained are shown in the table, with no treatment agent added as a blank.

[Effect of the invention] The treatment agent according to the present invention can efficiently float and separate oil and other suspended matter dispersed in water by adding a small amount and stirring, and contains an inorganic flocculant. Compared to processing agents, the amount of scum produced is 115 to 1/10, reducing processing costs.

Claims (1)

[Scope of Claims] A wastewater treatment agent characterized by containing a salt represented by the following general formula as a main component. R^1R^2R^3N・X (In the formula, R^1 is an alkyl group, alkenyl group, aralkyl group, phenyl group, or cycloalkyl group having 6 to 20 carbon atoms, and R^2 and R^3 are hydrogen Or carbon number 1~
20 alkyl or alkenyl groups, and X represents carboxylic acid or oxyacid. )