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The moisture content of municipal solid waste (MSW) and local precipitation events lead to the leachate generation from MSW land lls. The high concentration of organic pollutants in land ll leachate makes it hazardous, requiring treatment before disposal into the environment. Land ll Leachate is most commonly treated by reverse osmosis (RO), which generates large volumes of wastewater termed as RO reject. This investigation aims to stabilize the RO reject through an inexpensive and effective bioremediation strategy. A bench-scale aerobic suspended growth reactor study was conducted using three commercial conversion agents, namely EM.1, Bokashi powder, and coir pith powder. Overall benchscale e cacy of 63% was achieved in this study. The onsite studies were conducted in 7.5 kL arti cial ponds with 46% e cacy amid atmospheric in uences and constraints. In contrast, the control pond with no conversion agents showed an increase in pollution concentration over the 100 days of retention time.The ndings revealed that the investigated technology had a marginally lower evaporation rate and performed relatively well compared to traditional solar evaporation ponds. Moreover, the technology can be easily scaled-up and readily applied for RO reject treatment in MSW land lls.

The present study investigates the applicability of Fenton's oxidation for the treatment of a highly refractory, viscous, bulk drug industry effluent. The effluent is found to behave as a Newtonian fluid, thrice as viscous as water. Fenton's oxidation experiments on the undiluted effluent are conducted in accordance with central composite design (CCD), considering the operating factors of pH (3–11), FeSO4 dosage (3–15 g L−1), H2O2 dosage (7–19 mL L−1), and treatment time (30–150 min). The treatment yielded a maximum total organic carbon (TOC) reduction of 28% at neutral pH, FeSO4, and H2O2 dosages of 9 g L−1 and 13 mL L−1, respectively, for 150 min of operation. The maximal treatment efficacy observed at neutral pH is explained by the non‐radical mechanism of Fenton's oxidation, and further correlated with viscosity and type of fluid (here, Newtonian), as judged from the generated viscosity profiles. Upon comparison with previous effluent samplings, differing treatment efficacies are observed for different fluid types, that is, Newtonian and non‐Newtonian (shear thinning), with the latter obtaining twice the TOC reduction, under similar experimental conditions. Hence, the effect of viscosity and fluid type on the effectiveness of Fenton's oxidation treatment is experimentally validated and discussed.