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RISS 인기검색어
- 검색키워드
- 저자 : Hasan Johir, Md Abu (검색결과 2 건)
- 무료
- 기관 내 무료
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Volpin, Federico,Heo, Huijin,Hasan Johir, Md Abu,Cho, Jaeweon,Phuntsho, Sherub,Shon, Ho Kyong Elsevier 2019 Water research Vol.150 No.-
<P><B>Abstract</B></P> <P>Due to high phosphorus (P) and nitrogen (N) content, human urine has often proven to suitable raw material for fertiliser production. However, most of the urine diverting toilets or male urinals dilute the urine 2 to 10 times. This decreases the efficiency in the precipitation of P and stripping of N. In this work, a commercial fertiliser blend was used as forward osmosis (FO) draw solution (DS) to concentrate real diluted urine. During the concentration, the urea in the urine is recovered as it diffuses to the fertiliser. Additionally, the combination of concentrate PO<SUB>4</SUB> <SUP>3-</SUP>, reverse Mg<SUP>2+</SUP> flux from the DS and the Mg<SUP>2+</SUP> presents in the flushing water, was able to recover the PO<SUB>4</SUB> <SUP>3-</SUP> as struvite. With 50% concentrated urine, 93% P recovery was achieved without the addition of an external Mg<SUP>2+</SUP>. Concurrently, 50% of the N was recovered in the diluted fertiliser DS. An economic analysis was performed to understand the feasibility of this process. It was found that the revenue from the produced fertilisers could potentially offset the operational and capital costs of the system. Additionally, if the reduction in the downstream nutrients load is accounted for, the total revenue of the process would be over 5.3 times of the associated costs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 50% water recovery achieved with real urine as feed and commercial fertiliser blend as draw. </LI> <LI> 93% phosphorous recovery as struvite without additional Mg<SUP>2+</SUP> supply. </LI> <LI> 50% nitrogen recovery was achieved. </LI> <LI> pH below 6.5 necessary to avoid membrane scaling. </LI> <LI> OPEX and CAPEX of the process were investigated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Acid mine drainage treatment by integrated submerged membrane distillation–sorption system
Ryu, Seongchul,Naidu, Gayathri,Hasan Johir, Md Abu,Choi, Youngkwon,Jeong, Sanghyun,Vigneswaran, Saravanamuthu Elsevier 2019 CHEMOSPHERE - Vol.218 No.-
<P><B>Abstract</B></P> <P>Acid mine drainage (AMD), an acidic effluent characterized by high concentrations of sulfate and heavy metals, is an environmental and economic concern. The performance of an integrated submerged direct contact membrane distillation (DCMD) – zeolite sorption system for AMD treatment was evaluated. The results showed that modified (heat treated) zeolite achieved 26–30% higher removal of heavy metals compared to natural untreated zeolite. Heavy metal sorption by heat treated zeolite followed the order of Fe > Al > Zn > Cu > Ni and the data fitted well to Langmuir and pseudo second order kinetics model. Slight pH adjustment from 2 to 4 significantly increased Fe and Al removal rate (close to 100%) due to a combination of sorption and partial precipitation. An integrated system of submerged DCMD with zeolite for AMD treatment enabled to achieve 50% water recovery in 30 h. The integrated system provided a favourable condition for zeolite to be used in powder form with full contact time. Likewise, heavy metal removal from AMD by zeolite, specifically Fe and Al, mitigated membrane fouling on the surface of the hollow fiber submerged membrane. The integrated system produced high quality fresh water while concentrating sulfuric acid and valuable heavy metals (Cu, Zn and Ni).</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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