Vyzkum technologii chovu prasat a drubeze snizujicich emise amoniaku negativne ovlivnujicich zivotni prostredi.

In 2002 entered in force the law N. 86/2000 on air protection which brought in force new decree No. 353 a 356 involving methodology and frequency of ammonia emissions measuring of chosen sources of air pollution and referential and reducing technologies of ammonia emissions reduction. One of the goals of the project was to verify the selected enzymatic substances applied by spraying on bedding effectiveness applied into drink water and by blending into feed mixture. Verified enzymatic substances will become part of the proposal on best available techniques (BAT) included into referential document about the best available techniques (BREF).Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

High-Rate Partial Nitritation of Municipal Wastewater after Psychrophilic Anaerobic Pretreatment

Partial nitritation/anammox can provide energy-efficient nitrogen removal from the main stream of municipal wastewater. The main bottleneck is the growth of nitrite oxidizing bacteria (NOB) at low temperatures (<15 °C). To produce effluent suitable for anammox, real municipal wastewater after anaerobic pretreatment was treated by enriched ammonium oxidizing bacteria (AOB) in suspended sludge SBR at 12 °C. NOB were continually washed out using aerobic duration control strategy (ADCS). Solids retention time was set to 9–16 days. Using this approach, average ammonia conversion higher than 57% at high oxidation rate of 0.4 ± 0.1 kg-N kg-VSS^–1 d^–1 was achieved for more than 100 days. Nitrite accumulation (N–NO₂^–/N–NO_X) of 92% was maintained. Thus, consistently small amounts of present NOB were efficiently suppressed. Our mathematical model explained how ADCS enhanced the inhibition of NOB growth via NH₃ and HNO₂. This approach will produce effluent suitable for anammox even under winter conditions in mild climates