Influence of composition of raw wastewater on removal of nitrogen compounds in multistage treatment wetlands

Abstract

Influence of composition of raw wastewater on the efficiency of organic matter and nitrogen removal in multistage treatment wetlands has been examined. Commonly used indicators, like COD/BOD5 and BOD5/TN ratio, determining wastewater susceptibility to biodegradation in conventional treatment technologies were assessed. It was confirmed that multistage treatment wetland may be used for treatment of wastewater with high loads of organic pollutants and unfavorable composition for a biological treatment expressed by the ratio of COD/BOD5 and BOD5/TN equal to 2.7 and 0.7, respectively.

Optimizing Treatment of Cesspool Wastewater at an Activated Sludge Plant

“…In inflowing sewage, the coefficient of variation for BOD 5 was Cv = 18%, for COD it was Cv = 14%, and for Total Nitrogen it was Cv = 13%, which indicates in all cases a small differentiation of this indicator according to the scale proposed by Mucha [24]. Based on the results of analyses regarding the size of pollutant indicators in inflowing wastewater, it was found that their values corresponded to typical domestic sewage described in the literature [25][26][27][28]. The median value of the analysed indicators in sewage from cesspool was as follows: for BOD 5 -3825.0 mg•dm −3 , for COD-7750.0 mg•dm −3 , and for TN-585.0 mg•dm −3 .…”

The qualitative and quantitative analysis of the coupled C, N, P and Si retention in complex of water reservoirs

“…Anthropogenic sources of nitrogen and phosphorus compounds are connected with sewage and fertilizer loss, while human sources of silicon are minor. Moreover increased N and P loads may stimulate primary and secondary production thus growth of organic carbon (TOC) loads (Zeleňáková et al 2012 ; Wiatkowski et al 2015 ; Gajewska 2015 ). This effect distorts the natural water C:N:P:Si ratio causing negative changes in the biology of the ecosystems and the deterioration of water quality.…”