Keywords
wastewater treatment
biochar trickling filter
Vietnam
Abstract
The pollution caused by market wastewater has occurred for several years in Vietnam. In particular, untreated wastewater from riverside markets is often directly discharged into a river nearby, increasing loads of pollutants in the river. Every day, the An Cuu Market averagely discharges about 19 cubic metres of wastewater into the An Cuu River. However, a wastewater treatment system has not been yet built at the market due to different reasons, including the lack of investment capital. A trickling filter (TF) consisting of a fixed bed of biochar is a cost-acceptable technology for treating organic pollutants, nutrients, and suspended solids. In this study, a model of TF using biochar for An Cuu Market wastewater treatment is effectively operated with the organic loading rate varying from 188 to 550 gBOD5.m–3.day–1 and the hydraulic loading rate from 532 to 1899 L·m–2·day–1. The biochar trickling filter shows high removal efficiencies: 97% BOD5, 92% COD, 97% TSS, 66% PTot, and 62% NTot.
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