This paper presents the results of five years monitoring of an experimental wastewater treatment plant in southeast Brazil, comprised of a UASB reactor followed by a submerged aerated biofilter (BF) (field scale) and shallow polishing ponds (pilot scale). Three ponds in series achieved high quality effluent standards in terms of ammonia and E.coli, but a fourth pond did not result in further ef...

In the external nitrification (EN) biological nutrient removal (BNR) activated sludge (AS) system, the nitrification process is removed from the BNR activated sludge system and performed ‘externally’ on an integrated nitrifying trickling filter (NTF). As such, optimum design and operation of the NTF is essential for reliable performance of the ENBNRAS system. Although information on the design ...

BACKGROUND Constructed wetland is one of the natural methods of municipal and industrial wastewater treatments with low initial costs for construction and operation as well as easy maintenance. The main objective of this study is to determine the values of indicator bacteria removal, organic matter, TSS, ammonia and nitrate affecting the wetland removal efficiency. RESULTS The average concent...

Nitrifying wastewater treatment plants (WWTPs) are more efficient than non-nitrifying WWTPs to remove several micropollutants such as pharmaceuticals and pesticides. This may be related to the activity of nitrifying organisms, such as ammonia-oxidizing bacteria (AOBs), which could possibly co-metabolically oxidize micropollutants with their ammonia monooxygenase (AMO). The role of AOBs in micro...

Sorption media with mixes of some recycled materials, such as sawdust and tire crumbs, combined with sand/silt and limestone, become appealing in nutrient removal for promoting urban stormwater management with sustainability implications. This article aims to present a specific type of functionalized filter medium and examine its physicochemical process for nutrient removal with the aid of Lang...

Abstract In the zero-water exchange shrimp culture pond maintained with application of indigenous bioaugmentor, low levels total ammonia–nitrogen were reported, indicating relevance microbial communities. Sediments (0–5 cm layer) sampled from (85th day) and bacterial archaeal communities; specifically, ammonia oxidizers (ammonia-oxidizing bacteria, ammonia-oxidizing archaea, anaerobic bacteria)...

A pilot-scale multilayer rapid infiltration system (MRIS) for domestic wastewater treatment was established and efficient removal of ammonia and chemical oxygen demand (COD) was achieved in this study. The microbial community composition and abundance of ammonia oxidizers were investigated. Efficient biofilms of ammonia oxidizers in the stationary phase (packing material) was formed successfull...

by Jennifer Allen, M.S. Washington State University May 2009 Chair: Marc W. Beutel Ammonia pollution, commonly from sewage treatment plants and agricultural activities, can degrade surface waters by causing eutrophication and exhibiting toxicity to aquatic biota. Constructed treatment wetlands can be used to treat a wide array of waste waters, but low oxygen concentrations characteristic of the...