A Modern Process for Highly Efficient Wastewater Treatment
Increased requirements for environmental protection and rising sewage fees forces many industrial companies to have their own plant for wastewater treatment. As a result there is a growing demand for stable processes that permit cost savings or the re-use of wastewater by only having little operational and maintenance effort.
Water – The most important resource for mankind
Since 2008, for the first time, there are more people living in cities than in rural areas. The increasing density of urban areas and advancing intensification of industrial production is making resource water going to be claimed worldwide to an extent not known so far. In spite of applicable regulations the assimilative capacities of the natural waters are overburdened in many areas. Quite often rivers, lakes and coastal regions are to a large extent biologically dead which influences the hygiene of the public drinking water supply.
Unlike all other natural resources and despite serious pollution water can be transferred back to its original state. For this reason a great demand of efficient technologies for wastewater treatment exists.
Growing pressure on companies
Elevated, organic loads cause a massive imbalance in biological equilibrium due to high oxygen consumption during their microbiological degradation. Therefore, for the discharge of wastewater into waters, strict regulations in many countries apply to the sum of organics of COD (Chemical Oxygen Demand) and BOD (Biochemical Oxygen Demand).
As a result of the pressure of public authorities as well as their own economic considerations and increased environmental consciousness, many companies from the industrial as well as the waste management sector are increasingly forced to treat their effluents in their own plant. Because of high operating costs or necessary repairs many of those already existing plants are run at an insufficient cleaning capacity.
When using physiochemical treatment the organic load will either be separated in the form of a concentrated solution and disposed of at great expense or decomposed against high energy expenditure.
However, biological treatment benefit from the broad spectrum of natural microorganisms to treat organic burdened wastewater nature-orientated and without the use of chemicals. Modern aerobic treatment work with a small reactor volume and high biomass concentrations. Though, a high application of energy for the continuously necessary aeration is required to reach a good efficiency of degradation. Anaerobic treatment do not need aeration, but are less stable and do not completely degrade the organic load. They are efficient only if a high load and sufficient biogas extraction are present and no low limiting values are required.