Enhancement of methanogenic activity by micronutrient control: Micronutrient availability in relation to sulfur transport  

作　　者：Krittiya Pornmai Sawwalak Itsadanont Monchupa Lertpattanapong Kessara Seneesrisakul Achiraya Jiraprasertwong Malinee Leethochawalit Hidetoshi Sekiguchi Sumaeth Chavadej 

机构地区：[1]The Petroleum and Petrochemical College,Chulalongkorn University,Soi Chula 12,Phyathai Road,Pathumwan,Bangkok 10330,Thailand [2]Center of Excellence on Petrochemical and Materials Technology,Chulalongkorn University,Bangkok 10330,Thailand [3]School of Engineering and Technology,Walailak University,Nakhon Si Thammarat,80160,Thailand [4]Center of Excellence on Wood and Biomaterials,Walailak University,Nakhon Si Thammarat,80160,Thailand [5]Innovative Learning Center,Srinakarinwirot University,Sukhumvit Road,Bangkok,Thailand [6]Department of Chemical Engineering,Tokyo Institute of Technology,2-12-1 O-okayama,Meguro-ku,Tokyo 152-8552,Japan

出　　处：《Journal of Environmental Sciences》2023年第5期738-752,共15页环境科学学报（英文版）

摘　　要：The main purpose of this research was to clarify the influence of the addition of iron(Fe)alone(0–100 mg/L)or 50 mg/L of Fe with 2 mg/L each of cobalt(Co),copper(Cu)and nickel(Ni)on the methanogenic activity of a mesophilic two-stage UASB system treating ethanol wastewater at a fixed chemical oxygen demand(COD)loading rate of 16 kg/m^(3)/day under a continuous mode of operation and steady state condition.The addition of Fe provided the dual benefits of a reduction in both the dissolved sulfide and the hydrogen sulfide(H_(2)S)content in produced gas,resulting inmarginally improved hydrogen(H_(2))and methane(CH_(4))productivities.When the Fe dosage was increased beyond the optimum value of 50 mg/L,the process performance drastically declined,as a consequence of the high total volatile fatty acid(VFA)concentrations that inhibited both the acidogens and methanogens predominantly present in the 1st and 2nd reactors,respectively.The chemical precipitation of iron sulfide was responsible for the reduction of produced H_(2)S in both the aqueous and gaseous phases as well as the minimization of added amounts of all other micronutrients to fulfil the sufficiency of all micronutrients for anaerobic digestion(AD).The addition of 2 mg/L each of Co,Cu and Ni together with 50 mg/L Fe resulted in the greatest enhancement in process performance,as indicated by the improved CH_(4) yield(mL/g COD applied)to about 42.3%,compared to that without micronutrient supplement.

关 键 词：BIOGAS Ethanol wastewater Ferric MICRONUTRIENTS Sulfur transport 

分 类 号：TQ221.11[化学工程—有机化工] X703[环境科学与工程—环境工程]