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RISS 인기검색어
- 검색키워드
- 저자 : Johir, M.A.H. (검색결과 4 건)
- 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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Phosphate removal from water using an iron oxide impregnated strong base anion exchange resin
T. Nur,S Vigneswaran,M.A.H. Johir,P. Loganathan,T. Nguyen,J. Kandasamy 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Removing phosphate from water is important as it causes eutrophication, which in turn has a harmful effect on aquatic life, resulting in a reduction in biodiversity. On the other hand, recovery of phosphate from phosphorus containing wastewater is essential for developing an alternative source of phosphorus to overcome the global challenge of phosphorus scarcity. Phosphate removal from aqueous solutions was studied using an iron oxide impregnated strong base anion exchange resin, Purolite FerrIX A33E in batch and fixed-bed column experiments. Phosphate adsorption in the batch study satisfactorily fitted to the Langmuir isotherm with a maximum adsorption capacity of 48 mg P/g. In the column study, increase in inlet phosphate concentration (5–30 mg P/L), and filtration velocity (2.5–10 m/h) resulted in faster breakthrough times and increase in breakthrough adsorption capacities. Increase in bed height (3–19 cm) also increased adsorption capacity but the breakthrough time was slower. The breakthrough data were reasonably well described using the empirical models of Bohart–Adams, Thomas, and Yoon–Nelson, except for high bed heights. Phosphate adsorbed was effectively desorbed using 1 M NaOH and the adsorbent was regenerated after each of three adsorption/desorption cycles by maintaining the adsorption capacity at >90% of the original value. Greater than 99.5% of the desorbed P was recovered by precipitation using CaCl2.
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Effects of acidic and neutral biochars on properties and cadmium retention of soils
Qi, Fangjie,Dong, Zhaomin,Lamb, Dane,Naidu, Ravi,Bolan, Nanthi S.,Ok, Yong Sik,Liu, Cuixia,Khan, Naser,Johir, M.A.H.,Semple, Kirk T. Elsevier 2017 CHEMOSPHERE - Vol.180 No.-
<P><B>Abstract</B></P> <P>In this study, an acidic biochar and a neutral biochar were applied at 5 wt% into two soils for an 11-month incubation experiment. One Ferrosol soil (Ba) was slightly acidic with low organic matter and the other Dermosol soil (Mt) was slightly alkaline with high organic matter. The acidic (pH = 3.25) wood shaving (WS) biochar had no marked impact on nutrient levels, cation exchange capacity (CEC), pH and acid neutralization capacity (ANC) of either soil. By contrast, the neutral (pH = 7.00) chicken litter (CL) biochar significantly increased major soluble nutrients, pH, ANC of soil Ba. In terms of C storage, 87.9% and 69.5% WS biochar-C can be sequestrated as TOC by soil Ba and Mt, respectively, whereas only 24.0% of CL biochar-C stored in soil Ba and negligible amount in Mt as TOC. Biochars did not have significant effects on soil sorption capacity and sorption reversibility except that CL biochar increased sorption of soil Ba by around 25.4% and decreased desorption by around 50.0%. Overall, the studied acidic C rich WS biochar held little agricultural or remedial values but was favourable for C sequestration. The neutral mineral rich CL biochar may provide short-term agricultural benefit and certain sorption capacities of lower sorption capacity soils, but may be unlikely to result in heightened C sequestration in soils. This is the first study comprehensively examining functions of acidic and neutral biochars for their benefits as a soil amendment and suggests the importance of pre-testing biochars for target purposes prior to their large scale production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The C rich acidic biochar did not work for nutrients supply or Cd retention but helped in storing C. </LI> <LI> The neutral mineral rich biochar enhanced nutrient and sorption for some soils. </LI> <LI> Neutral mineral rich biochar hardly increased soil C after 11 months. </LI> </UL> </P>
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