Aerobic Granular Sludge System Nereda

Introduction What is sewage sludge? In Germany, daily water use now reaches 120 litres per person. All of this water ultimately ends up in the sewage system, and from there is channelled to sewage treatment plants. At such plants, the sewage passes through screens and sieves and undergoes mechanical and biological purification, the goal being to remove impurities from the sewage and to then channel the resulting purified water into waterbodies. The residue of this process is known as sewage sludge, which can occur in anhydrous, dried or other processed forms.

20 years ago there was little talk of odor control. WWTP’s and PS were located out of town, and odor was not a problem. Today odor control is generally considered an essential process in sewage treatment plant design, and in many other industries.

INTRODUCTION Odors remain at the top of air pollution complaints to regulators and government bodies around the U.S. and internationally. Ambient air holds a mixture of chemicals from everyday activities of industrial and commercial enterprises. A person’s olfactory sense, the sense of smell, gives a person the ability to detect the presence of some chemicals in the ambient air. Not all chemicals are odorants, but when they are, a person may be able to detect their presence. Therefore, an odor perceived by a person’s olfactory sense can be an early warning or may simply be a marker for the presence of air emissions from a facility. For whatever reason, it is a person’s sense of smell that can lead to a complaint. When facility odors affect air quality and cause citizen complaints, an investigation of those odors may require that specific odorants be measured and that odorous air be measured using standardized scientific methods. Point emission sources, area emission sources, and volume emission sources can be sampled and the samples sent to an odor laboratory for testing of odor parameters, such as odor concentration, odor intensity, odor persistence, and odor characterization. Odor can also be measured and quantified directly in the ambient air, at the property line and in the community, using standard field olfactometry practices, e.g. odor intensity referencing scales and field olfactometers.