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NoMix toilet 에서 발생하는 부산물을 이용한 수용액내 (준)중금속 제거 특성 및 가능성 연구
심재홍,임정묵,김진원,김해원,오병택,Shim, Jaehong,Lim, Jeong-Muk,Kim, Jin-Won,Kim, Hae-Won,Oh, Byung-Taek 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.1
Struvite (MgNH<sub>4</sub>PO<sub>4</sub> ⋅ 6H<sub>2</sub>O) and hydroxyapatite (HAP, Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub>) precipitation in urine-separating toilets (NoMix toilets) causes severe maintenance problems and also reduce the phosphate and calcium content. Application of urine separating technique and extraction of by-products from human urine is a cost effective technique in waste water treatment. In this study, we extract urine calcite from human urine by batch scale method, using urease producing microbes to trigger the precipitation and calcite formation process. Extracted urine calcite (calcining at 800℃) is a potential adsorbent for removal of heavy metal(loid)s like (Cd<sup>2+</sup>, Cu<sup>2+</sup>, Ni<sup>2+</sup>, Pb<sup>2+</sup>, Zn<sup>2+</sup> and As<sup>3+</sup>) along with additional leaching analysis of total nitrogen (T-N), phosphate (T-P) and chemical oxygen demand (COD). The transformations of calcite during synthesis were confirm by characterization using XRD, SEM-EDAX and FT-IR techniques. In additional, the phosphate leaching potential and adsorbate (nitrate) efficiency in aqueous solution was investigated using the calcinedurine calcite. The results indicate that the calcite was effectively remove heavy metal(loid)s lead up to 96.8%. In addition, the adsorption capacity (q<sub>e</sub>) of calcite was calculated and it was found to be 203.64 Pb, 110.96 Cd, 96.02 Zn, 104.2 As, 149.54 Cu and 162.68 Ni mg/g, respectively. Hence, we suggest that the calcite obtain from the human urine will be a suitable absorbent for heavy metal(loid)s removal from aqueous solution.
Cold plasma-assisted regeneration of biochar for dye adsorption
Dharma Raj Kandel(간댈더러머라즈),Hee-Jun Kim(김희준),Seungwon Chang(장승원),Jeong-Muk Lim(임정묵),Milan Babu Poudel(밀란 포델),Min Cho(조민),Hyun-Woo Kim(김현우),Byung-Taek Oh(오병택),Changwoon Nah(나창운),Seung Hee Lee(이승희),Bipee 대한환경공학회 2022 대한환경공학회 학술발표논문집 Vol.2022 No.11