Automatic online buffer capacity (alkalinity) measurement of wastewater using an electrochemical cell

Abstract

The use of an automatic online electrochemical cell (EC) for measuring the buffer capacity of wastewater is presented. pH titration curves of different solutions (NaHCO 3 , Na 2 HPO 4 , real municipal wastewater, and anaerobic digester liquid) were obtained by conventional chemical titration and compared to the online EC measurements. The results show that the pH titration curves from the EC were comparable to that of the conventional chemical titration. The results show a linear relationship between the response of the online EC detection system and the titrimetric partial alkalinity and total alkalinity of all tested samples. This suggests that an EC can be used as a simple online titration device for monitoring the buffer capacity of different industrial processes including wastewater treatment and anaerobic digestion processes.

Elevated biogas production from the anaerobic co-digestion of farmhouse waste: Insight into the process performance and kinetics

“…The microorganisms are also nifty at their tolerance in alkalinity of the bioreactor. Buffer capacity, the so-called alkalinity, is a parameter to evaluate the stability of anaerobic digesters (Cheng et al, 2016). The total alkalinity of the bioreactors at the beginning and end of the experiments is shown in Figure 3.…”

Effect of Combined Inoculation on Biogas Production from Hardly Degradable Material

“…No extra alkalinity was added in this study and the only source of alkalinity was the inoculum. Alkalinity represents the buffer capacity of the reactors and is a reliable parameter to evaluate the stability of the reactors [20]. The total alkalinity of the mono-and co-inoculated reactors before and after the digestion is limned in Figure 4.…”

“…The positive effect of co-digestion is due to the balanced carbon to nitrogen (C:N) ratio (ideal ratio ranges from 20:1 to 30:1) being achieved by treating different substrates simultaneously [19]. Co-digestion can also provide the necessary alkalinity and nutrients in order to confront the drawbacks of the mono-digestion of recalcitrant materials [20]. Nowadays, research efforts aim to reinforce sustainability through materials recovery and reduced energy consumption [21,22].…”

Anaerobic Co-digestion of Cooked Food Waste, Paper Waste and Potato Peel Waste

“…can be blended with the substrates having lower C/N ratio such as food and kitchen waste, pig manure, poultry manure and so on [5,6,7,8]. Co-digestion resolves the problems of mono digestion of resistive bio mass by providing necessary alkalinity and nutrients [9].…”