Protecting the environment has always been of importance to Brenntag. As part of our business activities, we consume water, electricity and different types of fuel, while simultaneously producing waste, waste water and various air emissions.
Brenntag’s locations around the world implement a wide range of measures based on the local and regional parameters and legal requirements and depending on their specific areas of activity, all with the common aim of protecting resources and using them optimally around the world, and of minimizing the impact that our business activities have on the soil, water and air.
Climate and Environmental Protection: Best Practices from the Brenntag regions
In 2016, Brenntag Specialties in the USA replaced a 40-year-old boiler at its site in Philadelphia, Pennsylvania, which is used to heat the large oil tanks. The investment is paying off with a significant reduction in energy consumption and energy costs as well as with lower emissions. Like the old boiler, the newly installed heating system uses natural gas, but has a heat conversion rate of 98%, making it a substantial 20% more efficient.
After an energy audit at its Trezzano site at the end of 2015, Brenntag Italy initiated a pilot project to test various efficiency measures and assess their impact on energy consumption in order to improve energy management. The focus in the year under review was on optimizing the compressors systems used. As a result of various measures, energy consumption was reduced by 15% compared to the previous year. For 2017, energy-saving measures are planned for forklift trucks, such as the use of hybrid vehicles.
In order to clean the instruments in its development laboratory in Buenos Aires, Brenntag Argentina consumes around 1,000 litres of water per month. Previously, this involved the use of drinking water, which was collected after the cleaning operations and then disposed of as industrial waste water. The site has now installed a simple, cost-effective system in order to make this cleaning water reusable.
In a first step, it is collected in a special tank and mechanically filtered using paper. It is then chemically treated so that the remaining dirt particles flocculate and the pH value of the treated water reaches the legally required level. 90% of the water purified and processed in this way is used for cleaning operations at the site. The positive effects: The volume of industrial waste water is reduced by around eleven tonnes annually, less drinking water is consumed and the laboratory’s operating costs are cut.
By reconfiguring the tank and pipe system for caustic and bleach material at the Houston-Greens Bayou site in Texas, Brenntag Southwest in the USA has been able to reduce the impact of process flush water, cut disposal costs and recycle chemicals. Caustic and bleach material are handled and stored at the site. The tanks and pipelines have to be flushed regularly as part of this. This cleaning water, which contains around 14% Sodium Hydroxideand 4% Bleach deposits, was previously collected separately and sent directly to a third-party company for disposal. This resulted in around 16 truck loads per year, or roughly 330 tonnes.
This process flush water is now filtered and the bleach particles in it are collected. These are then piped to a Brenntag owned facility located on the site, where they are converted into a lower grade industrial bleach. Around 50% of the bleach flushed out and subsequently collected can thus be recycled into a lucrative product for suitable applications.
Brenntag El Salvador has implemented an exemplary recycling project that benefits not just the environment but also the local neighbourhood at the site in San Salvador: Non-hazardous chemicals and products are regularly delivered to Brenntag in what are known as flexibags. This packaging consists of metal bars, cardboard and various fabric and plastic covers, much of which does not come into contact with the products delivered.
In line with the 3R principle (“reduction, reuse, recycling”) as part of the CASA programme operated by Brenntag Latin America, our employees use the plastic covers to protect wooden pallets, the metal rods to fortify the warehouse racks and the cardboard as dividers. They donate the large fabric covers to various establishments in the neighbourhood: A school uses them to make sun protection shields for the students, while a church community uses them to make tarpaulins for their vans. As a result, roughly one tonne of material is recycled, which is a recycling rate of 67%.
In order to reduce fuel consumption of its fleet, Brenntag Mid-South in the USA analyzed the idle times of the engines. Thanks to the telematics systems installed and the analysis system connected to them, typical idle times can be attributed to certain operations and situations. For example, a tanker uses the auxiliary drive system to create air pressure for unloading the material.
The analysis made it possible to identify drivers and situations whereby the expected idle times were exceeded. Discussions were conducted with the respective employees in order to identify the causes of the discrepancies and, if necessary, to bring about a change in their driving behaviour through coaching. The measure helped to improve the efficiency of the entire fleet of Brenntag Mid-South, which consists of 331 vehicles, by 0.8 kilometres per gallon of fuel (3.8 litres). This represents a fuel consumption reduction of around 8,880 gallons (around 33,600 litres) per year.
At Brenntag in Austria, all internal transport between the two sites Traun and Wiener Neustadt was switched from road to rail in 2016. Around 520 truck trips per year are replaced on the 220-kilometre route. This will reduce the annual fuel consumption of Brenntag Austria by around 32,000 litres and its CO2 emissions by approximately 85 tonnes.
At Brenntag GmbH’s Duisburg site, Germany, the soil in the warehouse is protected through multiple layers, thus preventing contamination of the subsoil and the ground water (see graph). Double-walled tanks for acids and alkalis are also fitted with a collection tray.
A separate closed circuit has been installed for the water used in the site’s process engineering, in its extinguishing systems and for cleaning purposes. Industrial water is captured and then cleaned and treated in several phases before being fed into the public sewer systems just as in normal household water. Water quality is continuously monitored and documented.
A large number of measures in and around our plant engineering systems ensure air pollution control and exhaust air purification. For example, gas leakages during the process of transfer from the road tanker to the storage tank are prevented by means of a special gas displacement procedure; when drums and cans are filled, the company’s sub-surface method prevents splashes and reduces emissions; exhaust air emitted during transfer processes is purified in air washers.
A photovoltaic system that generates approximately 150 megawatt-hours of electricity per annum was installed on the roof of the Brenntag location in Mouscron, Belgium, in April 2014. More than 70% of this electricity is used for the local production processes, accounting for a good 20% of the location’s entire energy requirements on average. The surplus solar electricity, which is primarily generated at the weekend and in the summer, is fed into the public grid. Brenntag only has to cover the costs of maintaining the solar system, which was installed by an external service provider and is financed by means of third-party green energy certificates.
The warehouses at many locations in the Brenntag Latin America region have been designed to enable natural lighting. Many office buildings also receive natural light by means of so-called “solar tubes”. In Honduras, solar panels on the roof of the plant are used to heat water for production of Brenntag’s AGROFEED fertilizer; in Brazil, solar cells power street lighting on the company’s site.
Brenntag Italy produces approximately 40,000 cubic meters of demineralized water per annum in a very resource efficient way by using industrial water. For this purpose, rainwater collected and processed at the locations and production waste water are cleaned by means of reverse osmosis in modern waste water treatment plants. The demineralized water produced in this way is then used in other processes and procedures such as in chemical dilution.
The Brenntag location in Wiener Neustadt, Austria, runs a highly efficient exhaust air purification system which ensures that the vapors produced when solvents are processed are not released into the environment and that only purified exhaust air is released.
The air is purified by means of catalytic oxidation. The exhaust air containing solvents is sucked away directly from various installations and workplaces at the plant and is fed into the purification system. Here it is preheated by a heat exchanger, before being brought up to operating temperature by a gas burner. A combustion process then occurs in the catalytic converter in which the solvents are oxidized to become harmless carbon dioxide. The purified exhaust air can be released directly via a chimney, as it falls within the relevant statutory clean gas values.
The advantage of catalytic oxidation is its comparatively low energy requirements, as the chemical reaction can occur at relatively low temperatures of approximately 300 degrees Celsius. In addition, this system involves the purified, hot exhaust air then being used to preheat the as yet unpurified air in the heat exchanger.
In a first phase, actual water use was monitored in the office and warehouse buildings of Brenntag’s location in Costa Rica. Any identified leaks or uncontrolled use was eliminated. In a second step in 2014, various measures were implemented to enable the use of collected rainwater. During the rainy season, up to 6,000 liters of water are captured in containers on top of the roof of the company’s main warehouse. Via a system of tubes, this water is fed to the location’s various buildings and used here for a number of different purposes.
In addition, water-conserving sanitary installations have been installed. Green spaces are no longer irrigated from above. This is now handled by means of a system of pipes which are directly linked up with the plants’ roots. Overall, these measures have had a considerable impact: water consumption has been reduced by more than half over a period of three years.