Abstract
Conventional quality parameters such as Chemical Oxygen Demand (COD) or Biochemical Oxygen Demand (BOD) give information about the quantity of organic matter present in wastewater, but do not give a clear indication of the biodegradability of the pollutants flowing in the WWTP. Detailed knowledge can be obtained by dividing the total COD into fractions. Fractionation and balancing of COD can be determined in various ways and with varying accuracy. Good wastewater characteristics are obtained on the basis of COD fractionation in accordance with ATV-A 131 guidelines, especially when the wastewater characteristics are in high compliance with the assumptions of the method. The article proposes a modification of the ATV-A131 method that increases the accuracy of determining the COD fraction. In order to reduce errors in the calculation of COD fractions, the value of fraction XS was calculated on the basis of the biochemical degradation rate determined in studies (k) for raw wastewater, whereas the SI fraction was calculated from the difference between SCOD and BODTot of filtered treated wastewater. BODTot of the treated wastewater was calculated taking into account the rate of biochemical degradation determined in the studies (k) for treated wastewater. The shares of individual COD fractions in raw wastewater calculated on the basis of the standard and modified procedure differed by approx. 10% in the case of suspension fractions. Modification of the methodology to determine the COD of the treated wastewater SS fraction significantly influenced the contents of all fractions in treated wastewater.
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
Reference27 articles.
1. Methods for Wastewater Characterisation in Activated Sludge Modelling. Water Environment Research Foundation;Melcer,2003
2. Wastewater Engineering: Treatment and Reuse;Tchobanoglous,2004
3. Biotechnologia Ścieków;Miksch,2010
4. Handbook of Water and Wastewater Microbiology;Mara,2003
5. Denitrification kinetics in biological N and P removal activated sludge systems treating municipal wastewaters
Cited by
17 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献