DE10025801B4 - Procedure for establishing a mistake v. Rainwater in sewage pipes - Google Patents

Abstract

method to detect incorrect discharge of rainwater in sewage pipes, thereby characterized in that in superficial water-draining systems or on areas with existing inlets, such as Roofs, Terraces, courtyard areas an intended amount of a liquid Mixture consisting of reagent R1 added manually or sprayed and in the range of the expected flow at measuring points, such as at the inspection shaft of a built-up property or at the transition of the connecting channel a reagent R2, which reacts with causes a color reaction to the reagent R1, is added and using image acquisition or automatic, moveable film technology a documentation of the expected color reaction he follows.

Description

The The invention relates to a method for determining incorrect introduction of rainwater in sewage pipes.

With the invention describes a method mainly of Waste water treatment companies are useful, however, too Sewage purpose associations, state environmental agencies or independent environmental organizations and municipalities find interest in this procedure to be described below become.

Out it is common today no longer justifiable that annually rainfall emerging surface waters, in only roughly estimable Orders of magnitude, together with e.g. Dirty water from households, the municipal Waste treatment plant supplied become. The associated additional costs for cleaning are ultimately over the Municipalities / housing associations or homeowners with payment the wastewater fee additionally financed.

According to today The level of knowledge is therefore based on the fact that surface water (rainwater) separated from waste water either stored or directly, using separate systems of Inflow fed become.

Out increased environmental awareness the share of this separate derivative increases, in particular when new housing estates are created, although according to conventional ones Methods of reviewing the actual Separation is done with more or less success.

A Known method in this direction represents the fogging of pipeline networks the sewer system. Here, by introducing the mist into the Main sewer the effect achieved that as a result of so-called "chimney effect" the fog at a higher point emerges and thus the path of discharges can be traced.

In the "ideal case" this should then Fog on downpipes, for example roof drainage. However, introductions are not possible determine that operated in connection with odor traps become. Furthermore, it may not be possible to Connection of several Introducer to determine the particular faulty connection of the individual.

such Procedures are described in the article “Foreign water overloaded many sewage systems "by K.-M. Liersch, Göttingen in “Correspondence Sewage "from 1985, Pp. 820 - 824. About the The introduction of smoke into the sewer network is said to be based on the outlet Gutters or yard drainage the incorrect introduction can be recognized. Also numbered (table) tennis balls, posted in Roof drainage, leave the path of traceability up to the polluter when the inclusion of the tennis balls in the sewage treatment plants he follows. An on-site inspection lets too the filling of colored Water (uranine) in yard drainage or gutters if its flow at the open house inspection shaft you can see.

This e.g. as v. G. have environmentally compatible one-component solutions however, the disadvantage that a intense coloring with proper initiation in an rainwater system an unpleasant visual appearance left in the pre-tide and others color solutions sustainable and therefore undesirable color changes on tiled roofs or create facades that are not excluded by the use of intensely colored color solutions can be.

Also the particularly simple-acting method of spraying normal Water on rooftops harbors a number of misinterpretations and can only be used relatively low informative value, for example after longer ones Dry periods are practiced.

The latter Procedure is not conclusive and can only be used for pre-orientation.

According to DE 4208970 A1 a method and a device for detecting and localizing leaks in pipelines is proposed. Leakage fluids that occur in operation on double-walled or multi-layered sewage channels and pipes in particular are checked during operation with the possibility of distinguishing between infiltrating groundwater, exfiltrating waste water, condensed water and surface water, and localizing leaks in the media pipe or inliner. The leaks are analyzed with regard to physical, chemical, biochemical, biological and / or other parameters or parameter combinations. This relatively complex method, which can only be used here in a very special way, can, in addition to correspondingly applicable, known (laboratory) technology, also be used to indicate incorrect discharges caused by an accident.

According to the European patent application 0 754 938 A1, a test liquid for detecting the leakage route of an escaping liquid is known. The self-illuminating test when exposed to UV light Liquid is used for leak testing of gas or liquid-conducting pipes, in automobile construction and for checking the tightness of buildings. The course of leaks can be followed optically.

in the U.S. Patent 2,228,737 discloses a method of testing equipment, in particular of pipelines and containers offered, with the focus on the detection of leaks. The ones to be checked Pipes or containers should be made of iron or other metal materials. The stake of several indicators or their combination shows one in case of leakage hydrogen concentration at the Surface of the Test objects on.

The Indicators used are phenolphthalein, phenolphthalein im Mixture with sodium dichromate and phenolphthalein in a mixture with ammonia

It is therefore the object of the invention to propose a method that overcomes the disadvantages of the known prior art and with little material and device technology Effort to make a reliable assessment of exactly where to derive surface water allowed. Another criterion for solving the task should be the environmentally friendly Aspect of the reagents used in combination with one not color-changed Surface wetting his.

• – Minimierung des Schmutzwasseraufkommens mit der Folge von Energie- und Kostensenkung bei der Abwasserbehandlung
• – Verminderung der Investitionsaufwendungen, z.B. bei der Neukonzeption von Kläranlagen
• – Vermeidung von unnötiger Überbelastung von Schmutzwasserkanälen bei starken Niederschlägen.

Other effects that can be achieved in the future in terms of the task would be in particular:

• - Minimizing the amount of wastewater resulting in energy and cost savings in wastewater treatment
• - Reduction of investment costs, for example when redesigning wastewater treatment plants
• - Avoid unnecessary overloading of sewage canals during heavy rainfall.

According to the Task solved as follows being based on the basic inventive ideas Reference is made to claim 1 and the further embodiment of the method in the claims 2 to 4 takes place.

to Presentation of the invention requires further explanations.

in the Area of origin or collection of paths to be checked and ultimately the Discharge of surface water becomes a groomed Water sample abandoned. The locations of this particular exam relate mainly roof areas or gutters / downspouts, slot inlets, floor drains on terraces, courtyard areas or other drainage, to investigate the whereabouts of the surface water arising here is.

The groomed Water sample, as a strongly aqueous solution, contains one alcoholic phenolphthalein solution, hereinafter referred to as R (reagent) 1 and is apparent colorless, its external Application by spraying onto the roof of a house or by introducing it suspected known enemas from Surface watering takes place. Dependent on on the size of the roof area or of capacity the drain pipes in land should be ensured that if necessary existing siphons are rinsed sufficiently and the incoming amount of liquid at measuring points to carry out of the procedure is sufficient. As a rule, 10 l are sufficient.

In Another process step is otherwise not in the dirty water contained mixture R1 with respect to its path to be covered examines that at typical places (measuring points) entry into pipelines leading away from built-up land, here on the one hand on the inspection shaft or via the basic pipeline and the connecting channel at the inlet in the dirty water main on the other hand, by moving with a reagent R2 recognized by a clearly marked color reaction can be.

At the Inspection shaft within a built-up property can this optical color reaction was determined without further aids be, whereas in the area of the inlet of the connecting channel in the in a street installed dirty water main line the check using a remote-controlled video camera takes place or it is on the inspection shaft using suitable image recording technology within a built-up plot the proof additionally documented.

It should be explicit again be advised that the concentrations of both components used no impairment of building substance and the environment and certify the harmlessness of the water can be.

In an embodiment the invention is intended to be closer explained become.

In a first process step, a solution R1 heavily diluted with water with alcoholic phenolphthalein solution is placed on roof surfaces or inlets of a property in an amount of up to approx. 10 l of liquid, which is colorless and sufficient, the way of a possible faulty introduction demonstrated.

The concentration of the phenolphthalein solution should be 0.001%, and using a 1% phenolphthalein solution in alcohol, one liter of this solution should be diluted with 1 m ^{3 of} water.

At the Place of investigation / review of the possible Flow of the misguided (waste water) surface water, namely the Inspection shaft in the area of the built-up property or in the area of the entrance from the connecting channel the sewage main is either manually (in the first Application) or with the help of a spray lance (in the second application) the reagent R2, for example dilute sodium hydroxide solution added. In the case of using the aforementioned dilute sodium hydroxide solution the red color reaction, which may start, becomes proof by a Incorrect initiation. The addition of is usually sufficient here a few ml.

As Reagents R1 and R2 (in ethanol dissolved Phenolphthalein and diluted Caustic soda) other suitable substances are used, but always on all-round environmental compatibility, with regard to the known water hazard classes.

After all, it should be advised that the 2-stage examination procedure can also be carried out in the reverse order of the substances to be used.

Checking one any color reaction at the transition of the connecting channel into the main sewage pipe by using a remote-controlled and movable channel camera.

Claims (4)

A method for determining the incorrect introduction of rainwater into sewage pipes, characterized in that a predetermined amount of a liquid mixture consisting of the reagent R1 is manually given or sprayed and in the area in superficial water-draining systems or on areas with existing inlets, such as roofs, terraces, courtyard areas of the expected flow at measuring points, such as at the inspection shaft of a built-up plot of land or at the transition of the connection channel into the main sewer line, a reagent R2, which causes a color reaction when reacting with the reagent R1, is added, as well as using image recording or automatic, moveable film technology the expected color reaction is documented. Procedure to identify misuse of Rainwater according to claim 1, characterized in that the as Reagent called mixture from an aqueous solution with in turn in Alcohol dissolved Phenolphthalein exists. Procedure to identify misuse of Rainwater according to claim 1, characterized in that as a reagent R2 diluted Sodium hydroxide solution is used. Procedure to identify misuse of Rainwater according to claim 1, 2 and 3, characterized in that inaccessible Reagent R2 is placed over the suspected introduction by means of a spray lance and the expected color reaction by means of suitable movable Channel cameras is documentable.