Feeding bio-P removal Alkaline fermentation and P-recovery Increasing pH in sludge fermentation increases production of fatty acids needed to feed biological Premoval. Recovery of phosphorus and nitrogen as struvite enables further process optimisation. P-recovery Germany Adapting sludge treatment to optimise struvite recovery Appropriate management of the sludge thickening process can increase...

Rotating biological contactors (RBCs) constitute a very unique and superior alternative for biodegradable matter and nitrogen removal on account of their feasibility, simplicity of design and operation, low land area requirement, low energy consumption, low operating and maintenance cost and treatment efficiency. The present review of RBCs focus on parameters that affect performance like rotati...

This paper shows the application of several kinds of artificial intelligence techniques in the development of a control system for a biochemical process. A wastewater treatment process for nitrogen removal in a sequencing batch reactor (SBR) is presented first; two different approaches to identify the endpoint of the biological reactions are introduced. The paper compares and analyzes the resul...

Biological nitrogen removal from wastewater is widely used all over the world on account of high efficiency and relatively low cost. However, not optimized when organic matter has inadequate effect for lack a sufficient carbon source in influent. Although addition an external (e.g., methanol acetic acid) could solve insufficient problem, it raises operating cost treatment plants (WWTPs). On oth...

In order to explore the effect of bionic plants constructed with different fillers on removal pollutants in river waters, this study made sponge filler and biological rope into plants, compared biofilm attached two through long-term field film tests. The that were successfully coated subjected an indoor purification test prove COD, ammonia nitrogen other water by plants.

In the present study the modified Ludzack-Ettinger predenitrification process was employed for the biological treatment of oil refinery wastewater. For this purpose an anoxic tank coupled to an oxic MBR operated at SRT and HRT of 60 days and 24hr , respectively was used. The findings of the present study showed that using a recylcle ratio (R) equal to both 2 and 4, COD and phenol removal effici...

A pilot-scale modified Orbal oxidation ditch with internal recycle of the nitrified liquor was developed to significantly enhance total nitrogen (TN) removal through simultaneous nitrification/denitrification (SND) coupled with pre-denitrification under the aerated-anoxic condition. Long-term operational results showed that the highest TN removal efficiency was achieved at very low dissolved ox...

Submerged membrane bioreactors (SMBR) are hybrid systems that couple a biological reactor, where the biodegradable substrates are consumed by the active biomass, and a membrane module, which prevents the solids to pass into the effluent, replacing the classical separation and recirculation unit. An improved version of an available mathematical model describing a SMBR was used to search for the ...

The direct release of nitrous oxide (N2O) and methane (CH4) from wastewater treatment plants (WWTP) is important because it contributes to the global greenhouse gases (GHGs) release and strongly effects the WWTP carbon footprint. Biological nitrogen removal technologies could increase the direct emission of N2O (IPCC, 2006), while CH4 losses are of environmental, economic and safety concern. Cu...

considering the importance of medicinal plants growth and biological application of fertilizers with sustainable agricultural production in order to eliminate or reduce chemical input to achieve desirable and sustainable quality, an experimental research was  conducted based on a randomized complete block design with two factors of chemical nitrogen (46% urea nitrogen) at  two levels (zero, 25 ...