These systems are mainly used to treat the surface water collected from the parking lots, air strips, road surfaces etc. The basic function of the light liquid separation systems is the liquid/liquid separation -  separating the light oil, petrol products to the surface water that is further sent for regular treatment. The separated and collected oil and petrol products are collected and treated separately. The quality requirements for the systems somewhat differ between regions, in Europe there is a specific standard EN858 covering the design and usage of these systems.

The European standard EN858 is governing the basics for the separator systems of light liquids. This standard covers the separation systems for light liquids (for example oil, petrol) with density below 0,95g/cm³. The standard itself is devided into two parts:

• Part 1 that covers the design, performance and testing requirements
• Part 2 that covers the selection of the nominal size, instalation, operation and maintenance related areas

I shall cover the types of the separators and their basic design in this brief report about the light liquid separation systems.

1 Introduction
For the static calculation of buried pipes, there are various regulations available on an international level. The publications of AWWA, SIA and DWA ([1] – formerly ATV-DVWK) are important for pipe statics. This article describes the basic procedure for the dimensioning of profiled pipes using the ATV-DVWK-A 127 (Germany) worksheet, as this set of rules also enjoys great international recognition.

2 Preface to the 3rd edition A127
"Due to new findings in pipe statics (experiments, comparisons with the finite element method, European standardization, etc.) and due to new developments in pipe systems (e.g. pipes with profiled walls), there is a need for regulation in various sections of the worksheet, which are summarized here in a third edition.

The mathematical limit between rigid and flexible behaviour is redefined with V_RB = 1. A new chapter is inserted for special features in the design of profiled pipes; a relevant data sheet ATV-M 127 Part 3 is in preparation". [2] p. 7. German edition translated.

Since 1989 the mass of insects in Europe has decreased up to 76%. It’s a topic which is constantly present, but nobody seems to take it serious and label it as a matter which is exaggerated by animal rights activists. Modern agriculture, climate change and habitat destruction lead to massive cuts in the number of Europe’s insects.
One third of the food we eat wouldn’t exist without bees. Honey, apples, berries, cocoa (chocolate), cotton, oils, creams, Make Up... just to name a few. This is the reality as it could be in 20, 30 or even 10 years.

 The factor we can influence the most is modern agriculture. The modern agriculture uses around 2.5 kilograms of pesticides per hectare of arable land per year. In sum that’s almost 40.000 tons in Germany per year. Pesticides, especially glyphosate or neonicotinoids, are mostly used in large companies which live from agriculture. They grow various fruit and vegetables and want them to look perfectly shaped and free of small insects like bugs or worms. To reach that they spray the fruit or vegetables with pesticides, so they can guarantee a perfect-looking, shiny end product, because that is what today’s society wants. And this is where the dilemma begins. The obvious pro of conventional agriculture is the output. While the biolo­gical agri­­culture reaches 75-87%, the con­ventional reaches 100%. Also, the price for biologically produced food is a little bit higher than “usual”. But what are these factors compared to clean, non-poisoned foods and animals living in much better conditions? Animals that aren’t fed with preventive medication and antibiotics (which we then take up), animals that can live free and aren’t squished together in a tiny stable with no sunlight or hygiene?
Additionally, as side effect, no insects or bees are attacked or poisoned with chemical plant protection products. But insect mortality isn’t the only problem we are facing if we keep on acting as if we had a Planet B. Most birds feed from insects and worms.

Accordingly, the number of birds has also decreased up to 50% in the past 30 years. Krah has decided to take a seemingly small, but effective step towards insect protection. For the past decades the lawns next to the company have been kept short due to optical reasons, but now we have seeded a large flower meadow. It has 3500 m² and has many different flowers for bees and insects to ensure a safe “resting place” and feeding station. If all of us would be a little bit more careful with our environment and would actually actively do something about it (e.g. taking care where and from whom we buy our food and thinking twice if we really have to mow all of our lawn with its flowers) we could eventually help the nature and animals to go back to a normal situation again.

                                                                                                                                                                 Jürgen and Lisa seeding the flower meadow

In the next issue of ImProfil we will hopefully be able to show how the meadow is growing and blooming.

Author:
Lisa, KAT GmbH

1. Gustavo, you have been in contact with the Krah company and Alexander Krah for nearly 20 years. How did you first meet and how did the relationship develop?
Our first contact with the Krah company was through a brochure that came to my hands around the year 1998. At that time, I made contact with Alex whom I personally met some time later at a plastics exhibition in Buenos Aires. From there, we began to work together, first exploring potential interested in technology within our region, and later starting Krah America Latina challenge in Argentina. Nowadays I can say that Alex, more than a supplier, is a great friend.