Process for purifying and reusing surfactant-containing waste wa

Details Process for purifying and reusing surfactant-containing waste wa Process for purifying and reusing surfactant-containing waste wa

1996-11-25

1999-03-23

Wyse, Thomas G.

Liquid purification or separation

Processes

Treatment by living organism

210610, 210615, 210622, 210631, 210910, 210912, C02F 900, C02F 126, C02F 306

Patent

active

058854592

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention concerns a process for purifying and reusing surfactant-containing waste waters from washing processes.
2. Description of the Related Art
The purification and reuse of surfactant-containing waste waters, in particular those such as produced by laundry facilities and car washes, as well as surfactant-containing waste waters from private households, represented technological challenge, since surfactants by nature present an extremely disruptive environment for organisms of all types, in particular the microorganisms of a mixed bioecology.
Above and beyond this, the industrial waste waters from a laundering process, in particular laundry waste waters or waste waters from car washes, comprise chemically relatively complex mixtures, which are extremely difficult to purify or to render reusable.
In particular, the waste waters from laundries are obviously strongly dependent in their quantitative and qualitative composition upon the detergents employed for the washing or as the case may be cleaning processes. Since universal detergents are primarily employed in the laundry facilities, the composition of the effluent is determined primarily, besides the textiles to be cleaned and the specific impurities contained therein, essentially by the composition of these universal detergents.
This type of universal detergent is comprised as a rule of an abundance of chemically varied substances, in particular anionic and non-ionic surfactants, fillers, compatibilizers, bleach agents, bleach activators, color preservers, corrosion inhibitors, stabilizers, anti-foaming agents, enzymes, optical brighteners as well as carriers and additive agents.
As anionic and non-ionic surfactants there can be mentioned for example alkylbenzolsulfonate, alcohol sulfate as well as alcohol ethoxylate.
As carriers generally zoelite A, sodium triphosphate and sodium carbonate are used. There is however an increasing modern trend for ecological reasons to avoid the use of phosphates and to replace these with ziolite and/or other silicates.
This type of carrier or filler is necessary, in order to enhance by a multiple the cleansing effect of the surfactant. In particular, the fat removing properties of the detergent or cleansing materials are strongly enhanced by the use of the fillers.
As co-fillers frequently a polycarboxylate is primarily used.
As bleaching agent, perborate, in particular sodium perborate as well as tetra acetyl ethylene diamine are used as bleach activators.
As fade inhibitors one employs mainly carboxymethylcellulose or, as the case may be, cellulose ether.
As corrosion inhibitors primarily alkaline silicate is employed.
Phosphonates serve as stabilizers and soaps, silicon oil and/or paraffin serve as foam inhibitors.
As enzymes primarily proteases and amylaces and sometimes however also lipases can be employed.
Above and beyond this, frequently optical brighteners comprised of stilbene or biphenyl distyryl types are employed.
Besides color materials, aromatic materials which can be added as a further ingredient frequently include sodium sulfate as a filler material or as the case may be as a production facilitating material.
The use of powder type universal laundry detergent in laundry facilities is experiencing increasing resistance to phosphates as ingredients and these phosphates are being replaced substantially with ziolites, soaps, citrates and amines, in particular tri- and monoethanolamine.
In particular, practically only phosphate-free laundry materials are being employed at this time in the United States and Japan as well as in the Netherlands, Germany, Switzerland, Austria and Italy and therewith in the effluent foam from laundry facilities.
In car wash facilities however a series of other substances end up in the effluent, for example, those which can be selected from: care substances for automobiles in particular waxes such as natural waxes or polyethylene based waxes, polishing substances; fatty substances; creams, in particular silicon fats, s

REFERENCES:
patent: 3958364 (1976-05-01), Schenck et al.
patent: 4292176 (1981-09-01), Gratsch et al.
patent: 5240600 (1993-08-01), Wang et al.
patent: 5580770 (1996-12-01), DeFilippi
patent: 5599443 (1997-02-01), Yamasaki et al.
patent: 5656169 (1997-08-01), Lugowski et al.
PCT International Preliminary Examination Report dated 18 Jun. 1996.

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