Performance evaluation of startup for a yeast membrane bioreactor (MBRy) treating landfill leachate

Abstract

The startup process of a membrane bioreactor inoculated with yeast biomass (Saccharomyces cerevisiae) and used in the treatment of landfill leachate was evaluated. The yeast membrane bioreactor (MBRy) was inoculated with an exogenous inoculum, a granulated active dry commercial bakers' yeast. The MBRy was successfully started up with a progressive increase in the landfill leachate percentage in the MBRy feed and the use of Sabouraud Dextrose Broth. The membrane plays an important role in the startup phase because of its full biomass retention and removal of organic matter. MBRy is a suitable and promising process to treat recalcitrant landfill leachate. After the acclimation period, the COD and NH removal efficiency reached values of 72 ± 3% and 39 ± 2% respectively. MBRy shows a low membrane-fouling potential. The membrane fouling was influenced by soluble microbial products, extracellular polymeric substances, sludge particle size, and colloidal dissolved organic carbon.

Leachates and natural organic matter. A review of their biotreatment using fungi

“…Likewise, ultrafiltration may also provide information about the evolution of molecular weight distributions for the leachate, although these are less detailed than those obtained from size exclusion chromatography (Wichitsathian et al, 2004). The evolution of toxicity during fungal treatment is another important parameter to monitor; the measurement methods for this variable include inhibition of the bioluminescence of Vibrio fischeri (Amaral et al, 2017b;Reis et al, 2017;Kalcikova et al, 2014;Ellouze et al, 2008), the determination of the germination index using Lepidium sativum (Spina et al, 2018;Tigini et al, 2014Tigini et al, , 2013Ellouze et al, 2007),…”

“…On the other hand, Kim et al (2003), Gao et al (2004, Brito (2013) Brito et al (2012), Hu et al (2017Hu et al ( , 2016, Amaral et al (2017a) and Bardi et al (2017a,b) used mature leachates, with BOD5/COD ratios lower than 0.1. Finally, Wichitsathian et al (2004), Saetang (2009) and Saetang and Babel (2010b) Amaral et al(2017b) would be defined as medium-aged. However, it should be taken into account that this rule is not very reliable: some of the compiled papers report leachates with COD of around 3000 mg/L but with a value for the BOD5/COD considerably higher than 0.1 (Kalčíková et al, 2014;Saetang, 2009) or even higher than 0.5 (Abdullah et al, 2013).…”

“…As expected, this effect was negative. Thus, this removal decreased from 48% at 84 mg/L NH4-N to 24% with Finally, a means of reducing the consumption of the additional nutrient as well as improving the start-up of continuous bioreactors was proposed by Brito and Amaral, who started their membrane bioreactor with 20% leachate and 3 g/L of Sabouraud broth, then gradually reduced the dilution and, after introducing 100% leachate, decreased the broth content step by step, allowing a slow acclimatization of the Saccharomyces cerevisiae employed (Amaral et al, 2017a;Amaral et al, 2017b;Brito, 2013;Brito et al, 2012).…”

Nitrogen resource recovery from mature leachate via heat extraction technology: An engineering project application

“…Membrane bioreactor (MBR) systems employ a combination of an active sludge system and ultrafiltration unit, which has proven to be practical and useful for leachate treatment (Oller et al 2011;Abuabdou et al 2018). However, denitrification requires a large amount of external carbon source, thereby limiting their application for mature leachate treatment (Bui Xuan et al 2013;Amaral et al 2017). Additionally, the high initial investment associated with conventional leachate treatment has led to a desire for novel technologies for NH 3 -N removal or recovery, especially for mature leachate, as well as the wastewater (Le et al 2021).…”