Nitrification preservation in activated sludge during curative bulking chlorination

Autor:	E, Cotteux, P, Duchene
Rok vydání:	2003
Předmět:	Oxygen Bacteria Sewage Nitrogen Facility Design and Construction Population Dynamics Chlorine Compounds Waste Disposal Fluid Water Purification
Zdroj:	Water science and technology : a journal of the International Association on Water Pollution Research. 47(11)
ISSN:	0273-1223
Popis:	The bulking that occurs in biological wastewater treatment plants using activated sludge is very often controlled by the injection of sodium hypochlorite into the return activated sludge (RAS) stream. In the present study undertaken at two pilot plants fed with synthetic wastewater, the impact of the pass frequency of the sludge at the chlorine dosing point on the nitrifying flora is analysed. The pass frequency is one for the pilot plant 1 and two for the pilot plant 2. A dose of chlorine of 4.85 +/- 0.05 g/kg/MLVSS per day was applied at both pilots. The preservative effect on nitrifying activity of the lowest concentration of chlorine at the dosing point and therefore of the highest pass frequency was evidenced. Among other tools, a simple method of measurement of the oxygen uptake rate enabled us to monitor the effect of chlorination on nitrification before recording an increase in the ammonia concentration in the bulking.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=pmid________::c6cd6f683e142b749cc55800221cfdf8 https://pubmed.ncbi.nlm.nih.gov/12906275 Zobrazit plný text záznamu