Single-tank simultaneous nitrification and denitrification (SNdN) processes can potentially eliminate the need for separate tanks and for recycling mixed liquor from oxic nitrifying zones to the typically upstream anoxic zones for denitrification. However, the conditions involved are more susceptible to sludge bulking by excessive growth of filamentous bacteria. This study was aimed at identify...

The possibilities of using jet aeration for biological wastewater treatment in small facilities were considered the article. In shallow depth reservoirs, studies carried out to change sizes actively aerated zone with a decrease height liquid layer reservoir. research was conducted aerators nozzles "keyway" type holes. It established that relative reservoir makes it possible increase share benef...

This review covers automatic control of continuous aeration systems in municipal wastewater treatment plants. The review focuses on published research in the 21st century and describes research into various methods to decide and control the dissolved oxygen (DO) concentration and to control the aerobic volume with special focus on plants with nitrogen removal. Important aspects of control syste...

Three different aeration plates are used to study their effect on gas holdup and flow regime transition in fiber suspensions. The aeration plates differ by their open-area ratios (A=0.57%, 0.99%, and 2.14%), where the hole diameter remains the same while the number of holes increase. Experiments are performed using three different Rayon fiber lengths (L=3, 6, and 12mm) over a range of superfici...

Abstract Aeration is the process of increasing dissolved oxygen (DO) content water, which an important water quality parameter for survival aquatic life. In this process, large amounts air bubbles develop; as a result, contact surface area increases, and hence water-air-mass transfer accelerates. There are numerous methods DO concentration in including self-aeration, mechanical aeration, chemic...

Accurate knowledge of volumetric oxygen mass transfer coefficients in multiphase systems is important for successfully designing and efficient operation process plants. As a result, large number papers on the determination kLa have been published literature. The dynamic degassing method probably most common determining coefficient. However, little work known influence countercurrent diffusion e...

this research, in addition to survey the existing data on the quality of sahebgharanieh wastewater treatment plant's effluent in the previous years, by runing a three months monitoring stage, studies the conditions of the final settling and aeration basin and the variations of the influent and effluent quantity and quality in removing of major pollutants (bod, cod, tss), while scrutinizing the ...

Wastewater treatment is an important environmental problem of the national economy any country. Therefore, increasing efficiency wastewater through use innovative technologies and equipment becoming relevant. Basically, for biological from organic biogenic pollution, aerotanks with different aeration systems are used. The mass transfer mixture waste water activated sludge accounts up to 80 % op...