Application of biological process to treat the groundwater with high concentration of iron and manganese

Abstract

A biological process was adopted In a groundwater plant for iron and manganese removal. The process included low-level aeration and single stage biological filtration. The separated native iron and manganese oxidizing bacteria were inoculated to the filter bed alongside raw water containing high concentrations of iron and manganese after multiplication (Fe^*io-I4mgi \ Mn^* 0.65-1.1 mgl ^)-The predominance of iron and manganese oxidizing bacteria were maintained in the filter by appropriately monitoring the operational parameters (filtration rate, backwash Intensity, backwash duration and backwash period). Then the filter had a significant and stable ability for iron and manganese removal. The quality of the filtrate met the Chinese National Standard for Drinking Water with concentrations of 0.05-0.1 mgl"^ Total-Fe (T-Fe) and 0.05mgl "^ Total-Mn (T-Mn) under the condition of the normal filtration rate (5-7mh ''), The process reduced investment costs by 6 million yuans (¥) and power costs by 250 thousand yuans (¥) per year compared with the traditional process (chemistry-contact oxidation including two-stage aeration and two-stage filtration).

Effect of drinking water treatment process parameters on biological removal of manganese from surface water

“…The initial period of poor Mn removal (Column D; pH 7.3) was unexpected based upon the published work of others (Mouchet, 1992;Katsoyiannis and Zouboulis, 2004;Li et al 2006;Burger et al 2008a;Katsoyiannis et al 2008). A definitive explanation for this difference in performance was not achieved in the current study.…”

“…As previously mentioned, most studies on the use of MOB in biofiltration have involved groundwater systems which generally have higher influent Mn concentration than surface water treatment plants (Mouchet, 1992;Vandenabeele et al 1992;Hope and Bott, 2004;Katsoyiannis and Zouboulis, 2004;Li et al 2006;Burger et al 2008a). Hope and Bott (2004) recommended an initial Mn concentration of 2.5 mg/L in a recirculation setup for fastest acclimation.…”

“…This could potentially be achieved by employing manganese-oxidizing bacteria (MOB), which are able to naturally oxidize Mn(II) to Mn(IV). Biological removal of Mn has been studied extensively in the treatment of groundwater and successfully applied at facilities (primarily in Europe) since the 1980s (Mouchet, 1992;Vandenabeele et al 1992;Hope and Bott, 2004;Katsoyiannis and Zouboulis, 2004;Pacini et al 2005;Stembal et al 2005;Li et al 2006;Burger et al 2008a;Tekerlekopoulou et al 2008). Biological Mn removal has traditionally been thought to be restricted to pH > 7.0e7.5 (Mouchet, 1992), although biological Mn removal may be possible at lower pH (6.5) (Burger et al 2008a(Burger et al , 2008b.…”

Comparison of Salix Genotypes for Co‐Phytofiltration of Iron and Manganese from Simulated Contaminated Groundwater in a Floating Culture System

“…Principal groundwater quality problems are typically associated with high hardness, high salinity, and elevated concentrations of mineral elements such as iron (Fe), manganese (Mn), ammonium, fluoride, and occasionally methane, hydrogen sulfide, nitrate, lead, chromium, and arsenic (Weng et al ; Nitzsche et al ). Natural leaching processes and anthropogenic activities result in high Fe and Mn concentrations in groundwater exceeding current regulatory standards (Li et al ; Du et al ), which have impacted many sites worldwide (Carrière et al ; Johnson et al ). The World Health Organization has proposed health‐based guidelines of 0.3 to 0.4 mg/L Mn and 0.3 mg/L Fe in drinking water (Carrière et al ; Chaturvedi and Dave ).…”

“…Groundwater is the main source of drinking water for local residents in the Hang‐Jia‐Hu Plain of Zhejiang province, China. However, Fe and Mn concentrations of groundwater in this region have exceeded the National Standards for Drinking Water Quality (GB 5749–2006; ∑Fe 0.05 to 0.1 mg/L and ∑Mn 0.05 mg/L) (Li et al ; Weng et al ). In Zhejiang province, the Fe and Mn present in shallow groundwater are mainly derived from the sediments (∑Fe 30,790 mg/kg and ∑Mn 602 mg/kg) deposited in the Holocene aquifer (Weng et al ).…”