Hotels, resorts, and guest houses have a common challenge, regardless of their size: they are not occupied to their full capacity all the time. They experience seasonal variations in their occupancy rates, with extremely low occupancy during off-seasons, and sudden spikes during certain days, particularly when there are special events or weddings.

Different types of water usage can contribute varying levels of pollutants to wastewater or sewage. Wastewater generated from hotel rooms can come from toilets, baths, and other activities that involve water usage. Rooms with bathtubs may have a large volume of water used by guests. Additionally, there is wastewater generated from common areas, which is mainly from toilets and urinals.

Hotels have kitchens that cater to both in-house guests and additional dining guests. However, these kitchens often do not practice proper waste and wastewater disposal. Food particles are commonly washed down the drain and used oil is often washed in sinks instead of being collected separately for disposal with solid waste. Additionally, oil and grease traps are sometimes not operated, cleaned, or maintained according to supplier specifications. As a result, the wastewater generated from the kitchen contains an extremely high level of organic loading and oil that cannot be processed by a sewage treatment plant.

Hotels laundry produce wastewater that contains detergents, fabric conditioners, and bleaching agents. However, the quantity of these substances is not high enough to require separate treatment. Many hotels have chosen to treat laundry water separately, but it is not necessary. A sewage treatment plant can handle this type of wastewater.

Hotel rooms contribute to around 60-75% of sewage, kitchens generating around 10-15%, common areas generating around 5-10%, and laundry generating around 5-10%. To manage this wastewater, most hotels have separate pipelines to collect wastewater from different sources in the hotel. By combining the wastewater generated from utilities other than the kitchen, up to 85% of sewage can be treated easily for reuse and recycling, resulting in significant energy savings of up to 50%. A separate treatment plant such as DAF can be used to treat highly polluted kitchen water, providing an effective way to manage the entire hotel's wastewater.