The presence of excess nitrate in natural water resources is determined worldwide and therefore the methods for reduction and prevention of water pollution are still being investigated. The main objective of the present study was the use of natural zeolite that was interacted with bacterial cells to obtain biozeolite particles (Bio-ZPs). The resulting Bio-ZPs were applied for nitrate removal fr...

Wetlands and ponds are frequently used to remove nitrate from effluents or runoffs. However, the efficiency of this approach is limited. Based on the assumption that introducing vertical mixing to water column plus carbon addition would benefit the diffusion across the sediment-water interface, we conducted simulation experiments to identify a method for enhancing nitrate removal. The results s...

Free ammonium in industries wastewater could be one of the worst toxic contaminants of aquatic life if diluted in water. Biological nitrogen removal (BNR) is the most common method for removing ammonium and nitrate from wastewater. Attached growth and suspended growth are the main BNR systems. The aim of the present work was to study the treatment of petrochemical wastewater (ammonium and nitra...

Abstract Nitrite (NO2?) accumulation and retaining of anammox bacteria are two decisive factors for stable operation partial denitrification coupled with the process. Denitrifying ammonium oxidation (DEAMOX) process has been regarded as a promising method nitrogen removal from wastewater containing both (NH4+) nitrate (NO3?) pollutants simultaneously. However, performance efficiency DEAMOX in b...

The aim of the study was to investigate the nutrient removal rate of three wastewater protozoan isolates (Aspidisca, Trachelophyllum and Peranema). The study was carried out in a laboratory-scale batch reactor for a period of 120 h. in a four batch study. Aliquot samples were withdrawn from the reactor every 24 h. for the analysis of phosphate, nitrate, nitrite, ammonia, chemical oxygen demand,...

Increasing levels of nitrate (NO3-) in drinking water in Denmark is of concern due to the possibility of an associated increase in long-term exposure to endogeneously formed N-nitroso compounds. Using a duplicate portion technique in combination with a qualitative description of diet and other background variables, the total nitrate intake in a Danish rural population and the contribution of dr...

This study investigated the effect of external carbon source and bed turnover rate on biological denitrification in the pilot-scale IPNR (Ilshin Phosphorus and Nitrate Removal) process. IPNR process is an up-flow reactor filled with Si-media which removes phosphorus physically and nitrate nitrogen biologically using secondary effluent from sewage treatment plant. Phosphorus (PO4-P) was removed ...

Published data on nitrate (NO3-) toxicity to freshwater and marine animals are reviewed. New data on nitrate toxicity to the freshwater invertebrates Eulimnogammarus toletanus, Echinogammarus echinosetosus and Hydropsyche exocellata are also presented. The main toxic action of nitrate is due to the conversion of oxygen-carrying pigments to forms that are incapable of carrying oxygen. Nitrate to...