Pilot-scale passive bioreactors for the treatment of acid mine drainage: Efficiency of mushroom compost vs. mixed substrates for metal removal

Removal of Sulphate and Manganese on Synthetic Wastewater in Sulphate Reducing Bioreactor Using Indonesian Natural Zeolite

“…Those precipitates were indicated on mixed SRB activity that can utilize sulphate (SO 4 2 -) as an electron acceptor, therefore generating hydrogen sulfide (H 2 S). Synthetic acid mine drainage containing lactate was used by SRB as organic substrate for generating bicarbonate ions and hydroxides [1]. Furthermore, those sulfides, carbonates and hydroxides can react with manganese metal and increase pH value in the AMD.…”

“…The reactor started with 5.5% sulfate reduction, 1.9% Mn removal and pH increased in 3 days operation without any lag period due the inoculation with active SRB biomass from an optimum batch experiment. The active SRB may have increased over time and the bacteria may have been adapted to the operating conditions [1][2]31]. The performance of a sulfate removal increased maximum to 23% in 9 days operation.…”

“…Those polluted waters occur when sulphide rock are exposed to oxygen and water in the absence of sufficient neutralizing minerals. The AMD is characterized by a low pH and high concentrations of heavy metals and sulphate [1][2]. The presence of elevated concentrations of manganese and other heavy metals in wastewater can exert detrimental effect on human health and environment due to their toxicities [3][4][5].…”

“…These reactors contain sulphate reducing bacteria (SRB) that have the ability to reduce sulphate to sulphide and then this sulphide reacts with certain metals dissolved, such as manganese, copper, iron and zinc, forming insoluble precipitates [1]. Numerous reactor designs for microbial sulphate reduction have been reported [4][5][6][7][8].…”

Investigation of the effect of binding material and Thiobacillus thiooxidans on the heavy metals mobilization in the mine tailings

“…İnek gübresi kompostu, mantar kompostu, saman tozu ve pirinç samanı ile gerçekleştirilen çalışmalarda, mantar kompostu ve karışık substratın sistem nötralizasyonunda diğerlerine oranla daha etkili olduğu görülmüş, 49. günden itibaren sülfat konsantrasyonu azalmaya başlamıştır. Çalışmada, Al %100'e yakın giderilmiş, Fe %68-91 oranında, Mn ise %49-61 oranında giderilmiştir [13].…”