Experimental study on efficient removal of total iron from wastewater using magnetic-modified multi-walled carbon nanotubes

Alimohammadi, Vahid; Sedighi, Mehdi; Jabbari, Ehsan

doi:10.1016/j.ecoleng.2017.01.044

Cited by 68 publications

(13 citation statements)

References 26 publications

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“…e comparison of splitting tensile test results with the predicted results from different proposed models by various researchers and standards is shown in Figure 8. Shafigh et al [18] proposed equation (1) for the LWC produced by using solid wastes from the palm oil industry. Arioglu et al [46] proposed equation (2) for the NWC with a cylinder compressive strength in the range of 40-120 MPa.…”

Section: Splitting Tensile Strengthmentioning

confidence: 99%

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Optimum Oil Palm Shell Content as Coarse Aggregate in Concrete Based on Mechanical and Durability Properties

Maghfouri

Shafigh

Aslam

2018

Advances in Materials Science and Engineering

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Oil palm shell (OPS) is a biosolid waste in palm oil industry in the tropical countries which could be used as aggregate in concrete mixture. Since 1984, OPS has been experimented as natural lightweight aggregate in research studies to produce lightweight concrete (LWC). Medium and high-strength LWCs using OPS as coarse aggregate were successfully produced. However, higher drying shrinkage and lower mechanical properties for concretes containing higher volume of OPS are reported in previous studies. Therefore, OPS is not fit to be used as full coarse aggregate in concrete mixture and therefore, there should be an optimum OPS content in concrete. In this study, in a normal-weight concrete, normal coarse aggregate was replaced with OPS from zero to 100% with an interval of 20%. Tests such as slump, density, compressive strength in different curing conditions, splitting tensile strength, initial and final water absorptions, and drying shrinkage of cured and uncured specimens were conducted to find out optimum OPS content in concrete. From the test results, it could be summarized that OPS content should not exceed 60% of total volume of coarse aggregate.

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Section: Splitting Tensile Strengthmentioning

confidence: 99%

“…Many of nondecomposed waste materials will remain in the environment for millennium. erefore, waste management is a way to reduce negative environmental effect and make the waste materials more sustainable [1,2]. Concrete simplicity lies in the fact that its constituents are ubiquitous almost anywhere.…”

Section: Introductionmentioning

confidence: 99%

Optimum Oil Palm Shell Content as Coarse Aggregate in Concrete Based on Mechanical and Durability Properties

Maghfouri

Shafigh

Aslam

2018

Advances in Materials Science and Engineering

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“…Stormwater runoff accounts for the most important water contaminants. The contaminants of such a source usually include, but are not limited to, bacteria, nitrate, total nitrogen, total phosphorus and heavy metals [3][4][5][6][7][8]. Contamination from stormwater runoff is a major issue that has been enhanced by urban expansion, imposing various impervious pavement-induced problems [9,10].…”

Section: Introductionmentioning

confidence: 99%

Stormwater Runoff Treatment Using Pervious Concrete Modified with Various Nanomaterials: A Comprehensive Review

et al. 2021

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Clean water is a vital need for all living creatures during their lifespan. However, contaminated stormwater is a major issue around the globe. A wide range of contaminants, including heavy metals, organic and inorganic impurities, has been discovered in stormwater. Some commonly utilized methods, such as biological, physical and chemical procedures, have been considered to overcome these issues. However, these current approaches result in moderate to low contaminant removal efficiencies for certain classes of contaminants. Of late, filtration and adsorption processes have become more featured in permeable concretes (PCs) for the treatment of stormwater. As nanoparticles have vast potential and unique characterizations, such as a higher surface area to cure polluted stormwater, employing them to improve permeable concretes’ capabilities in stormwater treatment systems is an effective way to increase filtration and adsorption mechanisms. The present study reviews the removal rate of different stormwater contaminants such as heavy metals, organic and other pollutants using nanoparticle-improved PC. The application of different kinds of nanomaterials in PC as porous media to investigate their influences on the properties of PC, including the permeability rate, compressive strength, adsorption capacity and mix design of such concrete, was also studied. The findings of this review show that different types of nanomaterials improve the removal efficiency, compressive strength and adsorption capacity and decrease the infiltration rate of PC during the stormwater treatment process. With regard to the lack of comprehensive investigation concerning the use of nanomaterials in PC to treat polluted stormwater runoff, this study reviews 242 published articles on the removal rate of different stormwater contaminants by using PC improved with nanoparticles.

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“…Other health issues like eye disorders (e.g. retinitis, conjunctivitis and choroiditis), cancer and cardiac disorders are also faced because of elevated iron concentration in the water (Alimohammadi et al, 2017). Chromium is found in environment in ores.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Removal of Iron and Hexavalent Chromium Via Slow Sand Filter Inoculated With Thiobacillus ferrooxidans and Waste management

Mian¹

2021

Preprint

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Many places have common physical, biological, and chemical hazards and heavy metals contamination in drinking water is very important to study especially near industrial areas and mining sources. Application of microbes along with other physicochemical techniques can prove to be the suitable remediation technology for the removal of metals from water. This study aimed to remove iron and hexavalent chromium from water using slow sand filters inoculated with iron-oxidizing bacteria Acidothiobacillus ferrooxidans. An experiment was performed for 37 days under controlled conditions, a water sample was prepared synthetically and another sample was collected from water filtration plant from Abbottabad city in KP Province- Pakistan and influents and effluents were tested for different parameters like pH, turbidity, hardness, total plate count, total dissolved solids, electrical conductivity and analysis of iron and hexavalent chromium in water. Acidothiobacillus ferrooxidans culture was isolated from soil using the differential iron media i.e. 9K medium and was inoculated into sand filters. At the end of the experiment, the removal efficiency of ferrous iron was about 52% and that of hexavalent chromium was 60.2%. In simultaneous treatment, it was observed that removal efficiency of iron was about 68% while that of hexavalent chromium was about 93% suggesting that slow sand filters were more effective for the removal of hexavalent chromium than iron. Hence, the designed slow sand filters were able to reduce the concentration of hexavalent chromium more efficiently than ferrous iron. And it was observed that slow sand filters can effectively remove ferrous iron and hexavalent chromium from water if they are inoculated with respective bacteria. Key,words,. Hexavalent Chromium, Iron Oxidizing, Sand Filters, Acidothiobacillus ferrooxidans, waste management.

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Experimental study on efficient removal of total iron from wastewater using magnetic-modified multi-walled carbon nanotubes

Cited by 68 publications

References 26 publications

Optimum Oil Palm Shell Content as Coarse Aggregate in Concrete Based on Mechanical and Durability Properties

Optimum Oil Palm Shell Content as Coarse Aggregate in Concrete Based on Mechanical and Durability Properties

Stormwater Runoff Treatment Using Pervious Concrete Modified with Various Nanomaterials: A Comprehensive Review

Simultaneous Removal of Iron and Hexavalent Chromium Via Slow Sand Filter Inoculated With Thiobacillus ferrooxidans and Waste management

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