DE19921443A1 - Process for cleaning drain pipes for fatty wastewater - Google Patents

Abstract

Disclosed is a method for cleaning drains for fatty waste water from households or industrial enterprises. Nitrogenous compounds are added to the fat-reducing and/or fat-emulsifying bacteria contained in the waste water. The inventive method is characterised in that 1. urea, a urea derivative, a salt of the urea and/or a salt of a urea derivative is/are added to a liquid drain cleaning agent and in that 2. urea, a urea derivative, a salt of a urea and/or a salt of a urea derivative and/or waterless magnesium sulphate is/are added to a solid drain cleaning agent. Growth factors in the form of supplines can be widely excluded. The amount of germ-inhibiting, organic substances is below 0.5 g/kg in relation to the drain cleaning agent in 1. and 2. The invention also relates to a cleaning agent that contains the aforementioned compounds.

Description

The invention relates to a method for cleaning drain pipes for fatty ones Wastewater from the household or from commercial companies, the in Wastewater contains fat-degrading and / or fat-emulsifying bacteria nitrogenous compounds are added.

A method of the type described above results from EP-B-236 989, which, however, requires the use of supplins, for example in the form of nitrogen-containing compounds. This well-known proposal is based on the knowledge that microorganisms have often specialized so that they need supplines for life. Supplines are essential substances that are part of the basic structure of the cell and cannot be synthesized by individual organisms. It is e.g. B. to amino acids, purines, pyrimidines, organic acids, carbohydrates and vitamins, especially phenylalalin, arginine, aspartic acid, oxalic acid, malic acid, malonic and propionic acid. In terms of their function and concentration, supplines differ significantly from nutrients. They correspond to the vitamins in animal and human nutrition. The following compounds can be specified as nutrients which fundamentally differ from supplins: ammonium, nitrate and phosphate ions, glucose, polysaccharides, proteins and carbohydrates. For the cleaning of drain pipes for fatty waste water from the household or from commercial companies, the supply of supplements for fat-reducing or fat-emulsifying bacteria prevents the formation of a plug in the drain pipe or, if such a plug should have already formed, dissolves it easily . In the context of the known proposal, a biological decomposition of the fat is therefore achieved by the bacteria present in the waste water. Supplink combination to promote fat-degrading (or emulsifying) bacteria are placed on the plug in the sewage pipe alone or in combination with a detergent. The supplink combination enables rapid growth of the desired bacteria, which leads to a dissolution of the annoying plug of fat in the drain pipe. The fat-degrading or emulsifying bacteria are a broad spectrum of bacteria that are normally contained in the wastewater itself. A detergent can be added to promote the penetration of the suppline into the fat plug and to support the microbial fat solution. The same purpose serves alone or in combination with the detergent, an addition of a CO ₂ developing powder, for. B. effervescent powder, which consists of about 50 weight percent sodium bicarbonate and about 50 weight percent tartaric acid.

The proposal described above has proven very valuable in practice. However, it is desirable to have an effect on drainage plugs and to improve their parts so that both a lighter and faster physical than also biochemical dissolution of plugs or their parts in the drain and Sewage can take place. Surprisingly, it has been shown that the use of Supplements, particularly of the type described above, are not required if additionally 1. urea, a urea derivative, a salt of urea and / or a salt of urea derivative and / or 2. the solid drain cleaner anhydrous Magnesium sulfate can be added.

The invention accordingly relates to a method for cleaning Drain pipes for fatty waste water from the household or commercial Company, whereby one the fat-reducing and / or contained in the waste water fat emulsifying bacteria adds nitrogen-containing compounds, this is characterized in that in addition 1. urea, a urea derivative, a salt of Urea and / or a salt of the urea derivative and / or 2. the solid Drain cleaner anhydrous magnesium sulfate can be added, growth factors in the form of supplins are largely excluded.

The addressed additive in the form of the germ-promoting organic substance can accordingly contain an open-chain or cyclic compound of the formula (I) R ₁ R ₂ N-CO-NR ₃ R ₄ , in which R ₁ to R _{4 are} each independently open-chain or cyclized and the following May have meaning: hydrogen, a lower alkyl group with 1 to 4 carbon atoms, a cycloalkyl group with 3 to 6 carbon atoms, an aryl group in the form of a phenyl or naphthyl radical, an aralkyl group with 7 to 18 carbon atoms, or an O-, S- , or N-containing heterocyclic group with 2 to 5 carbon atoms, the compound of formula (I) being wholly or partly in the form of a salt.

The following formula (I) should therefore include the following urea derivatives:

In the formula (I), the respective radicals R ₁ , R ₂ , R ₃ and R _{4 are} preferably hydrogen, since the corresponding starting compounds are commercially available or easier to prepare. Particularly suitable in the context of the invention are the substituents which are specified in the above definition of the invention. The lower alkyl group having 1 to 4 carbon atoms is in particular the methyl, ethyl, n-propyl, i-propyl and the various isomers of the butyl group. The cycloalkyl group with 3 to 6 carbon atoms includes in particular the cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl radical, the aralkyl group with 7 to 18 carbon atoms in particular the benzyl and phenethyl group, the alkylaryl group with 7 to 18 carbon atoms in particular the tolyl group and the heterocyclic group having 2 to 5 carbon atoms, in particular those in whose heterocyclic ring there is at least one oxygen, sulfur or N atom, suitable examples being the radicals of oxirane, tetrahydrofuran, dioxane and pyran.

In principle, the compounds of the formula (I) can also be in the form of their salts or other precursors that can promote solubility can be used. In In individual cases, this can only lead to the desired solubility. It can So compounds come into question that the compounds of formula (I) only in Release aqueous medium or let its effectiveness unfold there. The  the following quantities always relate to the compounds of the formula (I) as such or their share within the suitable derivatives or compounds.

Within the scope of the invention, the ureas or Urea derivatives can use any suitable salts, provided that they contain the desired one Do not interfere with the mechanism of action. For example, come into question Chlorides, sulfates, especially hydrogen sulfate, phosphates, especially the Hydrogen phosphates. Urea phosphate is particularly effective. Urea phos phat, crystallized in pure form, is colorless, has a melting point of 118 to 119 ° C, is soluble in water, alcohol, acetic acid, glycerin, ethylene glycol and the like. The aqueous solution reacts acidic (1 percent solution pH 1.8). In addition to being widely used as an artificial fertilizer (N / P source), it also offers another advantageous practical use due to its acidity in solder, Melting fluxes, pickling agents, metal cleaning agents and rust removers and as Catalyst for acid-catalyzed synthetic resins (see p. 1723, Römpp Chemie- Lexikon, Theme Verlag, vol. 3, 9th edition 1990). A suggestion to him under a solid or liquid drain cleaner to solve the problem formulated above use is not found in the prior art or none at all related suggestion.

The person skilled in the art can easily determine the optimal amount of additive according to the invention depending on the particular application adjust. As a preferred framework, the Urea in an amount of about 0.1 to 20 percent by weight, especially about 5 to 15 weight percent, the urea phosphate in an amount of about 0.2 to 40 % By weight, in particular 2 to 30% by weight, and the magnesium sulfate in an amount of about 5 to 95 percent by weight, especially about 20 to 70 Percentage by weight, based on solid or on the solid cleaner, to be used.

The essence of the invention is therefore the solid or liquid drain cleaner Urea and its derivatives, including its salts, such as. B. urea phosphate count, especially in combination with fat, protein and carbohydrates  building enzymes and microorganisms. In the case of the fixed Drain cleaner, it can be advantageous to this water-free Incorporate magnesium sulfate. This can due to its property profile can also be used in isolation.

Technologically, the present invention can be explained as follows: urea and favor its designated derivatives, both as such or in salt form due to water-binding, swelling and protein-solving Properties not only physically the hydrophilization of plugs and their Share, but also their physical explosion or dissolution. Moreover penetration and degradation performance of natural or added microorganisms and enzymes on the graft and its parts and thus the biological chemical degradation accelerates, e.g. B. also in wastewater. At the same time, the Growth factors described in the prior art (see proposal above EP-B-236 989) largely omitted in the form of supplins or by the Additives replaced according to claim 1. It must be surprising that omission of the growth factors nevertheless the desirable technical success occurs. In addition, there is the further advantage that the proportion is more polluting Detergents to the plug solution can be lowered. That in the case of the fixed Drain cleaner advantageously additionally used anhydrous magnesium sulfate leads as neutral salt due to strong positive heat when dissolved in water to a significant increase in temperature at the plug. This favors e.g. B. physically breaking up by melting the fatty substances and making it easier thus their emulsification (e.g. by adding surfactants). You can also use the Ratio of salt and water quantity optimal temperature conditions for the biological / chemical degradation both on the graft and in the waste water to adjust. In contrast to the solution heat, which also has positive heat, however strongly alkaline-caustic sodium hydroxide in numerous drain cleaners anhydrous magnesium sulfate a completely safe, consumer as well environmentally friendly neutral salt. Of course, it is obvious to the person skilled in the art that the anhydrous magnesium sulfate also by other anhydrous neutral salts can be replaced, which correspond to its property profile, and that such  Salts thus develop a new active principle in solid drain cleaners not yet found in the prior art.

The invention will be explained in more detail below using exemplary embodiments without any limitation.

example 1 (Destruction of the plug in the drain pipe)

The formulations which can be used in the context of the invention result from the table given below, which comprises both a powdery and a liquid variation:

0.5 g of the above-mentioned mixture are added as detergent 3 g of dodecyl sulphate and as CO ₂ developing agent, an effervescent powder of 5 g of sodium hydrogen carbonate and 5 g of tartaric acid. 13.57 g of the mixture, which corresponds to the volume of a tablespoon, is mixed with 900 ml Water and 100 ml of an earth suspension (as a source of bacteria) are mixed and added in a beaker to a cylindrical test specimen (∅ 32 ml; length 29 ml; weight 17 g) of the following components:
27% by weight water, 3% by weight hair, 10% by weight palmin (coconut fat), 17% by weight pork fat, 20% by weight coffee grounds, 6% by weight tea leaves.

At a temperature of 15 ° Celsius, the combination is added Contains detergent and effervescent powder for the cylindrical test specimen (fat plug) in a beaker. After a few minutes, the examinee is so badly attacked that he in the event of vigorous shaking or rinsing with water Sewage pipe) has disintegrated.

Claims (8)

1. A method for cleaning drain pipes for fatty waste water from the household or commercial companies, adding nitrogen-containing compounds to the fat-degrading and / or fat-emulsifying bacteria contained in the waste water, characterized in that in addition

• 1. urea, a urea derivative, a salt of urea and / or a salt of urea derivative and / or
• 2. anhydrous magnesium sulfate is added to the solid drain cleaner,

growth factors in the form of supplins are largely excluded. 2. The method according to claim 1, characterized in that urea is used is, in particular in an amount of about 0.1 to 20 wt .-%, based on Solids content. 3. The method according to claim 1, characterized in that urea phosphate is used, in particular in an amount of about 0.2 to 40% by weight, based on solids content. 4. The method according to any one of claims 1 to 3, characterized in that a Mixture of urea and urea phosphate is used. 5. The method according to at least one of the preceding claims, characterized characterized in that fat, protein and carbohydrate-degrading enzymes and / or Microorganisms can be added.   6. The method according to at least one of the preceding claims, characterized characterized in that when using a solid cleaner anhydrous magnesium sulfate is included, particularly in an amount of about 5 to about 95% by weight. 7. The method according to at least one of the preceding claims, characterized in that a detergent and / or a CO ₂ -developing agent is additionally added. 8. Detergent, in particular for cleaning drain pipes, for fatty waste water from the household or from commercial companies, adding nitrogen-containing compounds to the fat-degrading and / or fat-emulsifying bacteria contained in the waste water, characterized in that it additionally

• 1. urea, a urea derivative, a salt of urea and / or a salt of a urea derivative and / or
• 2. Contains anhydrous magnesium sulfate as a solids cleaner, growth factors in the form of supplins being largely excluded.