scholarly journals Evaluation of advanced phosphorus removal from slaughterhouse wastewater using industrial waste-based adsorbents

2021 ◽  
Author(s):  
Shengdan Sun ◽  
Chuanping Feng ◽  
Shuang Tong ◽  
Yan Zhao ◽  
Nan Chen ◽  
...  
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Steel Slag ◽  
Industrial Wastes ◽  
Raw Material ◽  
Maximum Adsorption Capacity ◽  
High Concentration ◽  
Slaughterhouse Wastewater ◽  
Practical Applications ◽  
P Removal

Abstract Slaughterhouse wastewater (SWW) contains high concentration of phosphorus (P) and is considered as a principal industrial contaminant that causes eutrophication. This study developed two kinds of economical P removal adsorbents using flue gas desulfurization gypsum (FGDG) as the main raw material and bentonite, clay, steel slag and fly ash as the additives. The maximum adsorption capacity of the adsorbent composed of 60% FGDG, 20% steel slag, and 20% fly ash (DSGA2) was found to be 15.85 mg P/g, which was 19 times that of the adsorbent synthesized using 60% FGDG, 30% bentonite, and 10% clay (DSGA1) (0.82 mg P/g). Surface adsorption, internal diffusion, and ionic dissolution co-existed in the P removal process. The adsorption capacity of DSGA2 (2.50 mg P/g) was also evaluated in column experiments. The removal efficiency was determined to be higher than 92% in the first 5 days, while the corresponding effluent concentration was lower than the Chinese upcoming SWW discharge limit of 2 mg P/L. Compared with DSGA1, DSGA2 (synthesized from various industrial wastes) showed obvious advantages in improving adsorption capacity of P. The results showed that DSGA2 is a promising adsorbent for the advanced removal of P from SWW in practical applications.

scholarly journals Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 753
Author(s):  
Sonja Milićević ◽  
Milica Vlahović ◽  
Milan Kragović ◽  
Sanja Martinović ◽  
Vladan Milošević ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Natural Zeolite ◽  
Fixed Bed ◽  
Raw Material ◽  
Copper Removal ◽  
Maximum Adsorption Capacity ◽  
High Concentration ◽  
Saturation Point ◽  
Synthetic Solution ◽  
Flow Through

The intent in this paper is to define how the batch equilibrium results of copper removal from a synthetic solution on natural zeolite can be used for prediction of the breakthrough curves in the fixed-bed system for both a synthetic solution and wastewater. Natural zeolite from the Vranjska Banja deposit, Serbia, has been fully characterized (XRD, chemical composition, DTA/TG, SEM/EDS) as a clinoptilolite with cation exchange capacity of 146 meq/100 g. The maximum adsorption capacity (qm) in the batch of the mono-component system (synthetic copper solution) obtained using the Langmuir isotherm model was 7.30 and 6.10 mg/g for particle size below 0.043 and 0.6–0.8 mm, respectively. Using the flow-through system with the 0.6–0.8 mm zeolite fixed-bed, almost double the adsorption capacity (11.2–12.2 mg/g) has been achieved in a saturation point for the copper removal from the synthetic solution, compared to the batch. Better results are attributed to the constant high concentration gradient in flow-through systems compared to the batch. The complex composition of wastewater and large amounts of earth alkaline metals disturb free adsorption sights on the zeolite surface. This results in a less effective adsorption in flow-through systems with adsorption capacity in breakthrough point of 5.84 mg/g (~0.95 × qm) and in a saturation point of 7.10 mg/g (~1.15 × qm).

scholarly journals Study of the Physical Behavior of a New Composite Material Based on Fly Ash from the Combustion of Coal in an Ultra-Supercritical Thermal Power Plant

2021 ◽  
Vol 5 (6) ◽  
pp. 151
Author(s):  
Mustapha El Kanzaoui ◽  
Chouaib Ennawaoui ◽  
Saleh Eladaoui ◽  
Abdelowahed Hajjaji ◽  
Abdellah Guenbour ◽  
...  
Keyword(s):  
Composite Material ◽  
Fly Ash ◽  
Power Plant ◽  
High Performance ◽  
Thermal Power ◽  
Recovery Process ◽  
Industrial Wastes ◽  
Raw Material ◽  
Polymerization Reaction ◽  
High Performance Composite

Given the amount of industrial waste produced and collected in the world today, a recycling and recovery process is needed. The study carried out on this subject focuses on the valorization of one of these industrial wastes, namely the fly ash produced by an ultra-supercritical coal power plant. This paper describes the use and recovery of fly ash as a high percentage reinforcement for the development of a new high-performance composite material for use in various fields. The raw material, fly ash, comes from the staged combustion of coal, which occurs in the furnace of an ultra-supercritical boiler of a coal-fired power plant. Mechanical compression, thermal conductivity, and erosion tests are used to study the mechanical, thermal, and erosion behavior of this new composite material. The mineralogical and textural analyses of samples were characterized using Scanning Electron Microscopy (SEM). SEM confirmed the formation of a new composite by a polymerization reaction. The results obtained are very remarkable, with a high Young’s modulus and a criterion of insulation, which approves the presence of a potential to be exploited in the different fields of materials. In conclusion, the composite material presented in this study has great potential for building material and could represent interesting candidates for the smart city.

scholarly journals Hydrothermal Synthesis of Sodalite-Type N-A-S-H from Fly Ash to Remove Ammonium and Phosphorus from Water

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2741
Author(s):  
Pengcheng Lv ◽  
Ruihong Meng ◽  
Zhongyang Mao ◽  
Min Deng
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Kinetic Studies ◽  
Solute Concentration ◽  
Raw Material ◽  
Sodium Aluminosilicate ◽  
Equilibrium Data ◽  
One Step ◽  
Ft Ir

In this study, the hydrated sodium aluminosilicate material was synthesized by one-step hydrothermal alkaline desilication using fly ash (FA) as raw material. The synthesized materials were characterized by XRD, XRF, FT-IR and SEM. The characterization results showed that the alkali-soluble desilication successfully had synthesized the sodium aluminosilicate crystalline (N-A-S-H) phase of sodalite-type (SOD), and the modified material had good ionic affinity and adsorption capacity. In order to figure out the suitability of SOD as an adsorbent for the removal of ammonium and phosphorus from wastewater, the effects of material dosing, contact time, ambient pH and initial solute concentration on the simultaneous removal of ammonium and phosphorus are investigated by intermittent adsorption tests. Under the optimal adsorption conditions, the removal rate of ammonium was 73.3%, the removal rate of phosphate was 85.8% and the unit adsorption capacity reached 9.15 mg/L and 2.14 mg/L, respectively. Adsorption kinetic studies showed that the adsorption of ammonium and phosphorus by SOD was consistent with a quasi-secondary kinetic model. The adsorption isotherm analysis showed that the equilibrium data were in good agreement with the Langmuir and Freundlich model. According to thermodynamic calculations, the adsorption of ammonium and phosphorus was found to be a heat-absorbing and spontaneous process. Therefore, the preparation of SOD by modified FA has good adsorption properties as adsorbent and has excellent potential for application in the removal of contaminants from wastewater.

scholarly journals Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 63
Author(s):  
Maria Harja ◽  
Gabriela Buema ◽  
Nicoleta Lupu ◽  
Horia Chiriac ◽  
Dumitru Daniel Herea ◽  
...  
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Copper Ions ◽  
Synthetic Wastewater ◽  
Bet Surface Area ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Copper Adsorption ◽  
X Ray

Fly ash/magnetite material was used for the adsorption of copper ions from synthetic wastewater. The obtained material was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) surface area, and vibrating sample magnetometer (VSM). Batch adsorption experiments were employed in order to investigate the effects of adsorbent dose, initial Cu (II) concentration and contact time over adsorption efficiency. The experimental isotherms were modeled using Langmuir (four types of its linearization), Freundlich, Temkin, and Harkins–Jura isotherm models. The fits of the results are estimated according to the Langmuir isotherm, with a maximum adsorption capacity of 17.39 mg/g. The pseudo-second-order model was able to describe kinetic results. The data obtained throughout the study prove that this novel material represents a potential low-cost adsorbent for copper adsorption with improved adsorption capacity and magnetic separation capability compared with raw fly ash.

scholarly journals Adsorption Capacity of Ca2+ by Hydrochloric Acid Activated Kaolin

2021 ◽  
Vol 926 (1) ◽  
pp. 012082
Author(s):  
N Wahyuni
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Capacity ◽  
Calcium Ions ◽  
Contact Time ◽  
Maximum Adsorption Capacity ◽  
High Concentration ◽  
Straightforward Method ◽  
Diamine Tetraacetate ◽  
Ca Ions ◽  
Time Variations

Abstract A high concentration of calcium ions in water is a problem as it can cause blockages in engine pipes. Adsorption is a relatively cheap and straightforward method that can be used to reduce the calcium ion content in water. Kaolin is a mineral that has a potential as an adsorbent and whose adsorption capacity can be increased by activation. This research studied the adsorption capacity of activated kaolin by hydrochloric acid against Ca2+ ions. Kaolin was chemically activated using 6 M HCl solution for 24 hours. The adsorption contact time in batches was varied with time variations of 30, 90, 150, and 180 minutes. The maximum adsorption capacity of activated kaolin to the Ca2+ was determined by varying the initial concentrations of water samples, namely 4, 7, 10, and 13 mg/L. The concentration of Ca2+ was determined by a titration method using ethylene diamine tetraacetate (EDTA). The results showed that the activation of kaolin with 6 M HCl at the optimum contact time of adsorption, namely 150 minutes, increased the percentage of adsorbed Ca ions to 2 times of that of natural kaolin, from 33.3% to 68.3%. Based on the Langmuir equation, the maximum adsorption capacity of calcium ions by activated kaolin HCl 6 M increased 1.7 times from natural kaolin to 0.346 mg/g.

Study on Biosorption of Uranium by Bacillus subtilis and Saccharomyces uvarum

2013 ◽  
Vol 807-809 ◽  
pp. 1155-1159 ◽  
Author(s):  
Qian Liao ◽  
Chun Long Cui ◽  
Jun Yi
Keyword(s):  
Bacillus Subtilis ◽  
Adsorption Capacity ◽  
Growth Curve ◽  
Uranium Concentration ◽  
Maximum Adsorption Capacity ◽  
High Concentration ◽  
Saccharomyces Uvarum ◽  
Significant Difference ◽  
Curve Model ◽  
Optimal Effect

The paper studied the growth law of Bacillus subtilis and Saccharomyces uvarum, and the interaction between the uranium system and strains in the different concentrations of uranium. The results showed that the B. subtilis almost appeared linear growth when uranium concentration was under the 450 mg/L, and the growth curve of the S.uvarum primarily met the S-growth curve model while uranium concentration was under the 600 mg/L. When the uranium concentration reaching 600 mg/L, the B. subtilis stopped growing, but the S. uvarum grown normally and had no significant difference compared with the control. The adsorption capacity of two strains increased with increasing uranium concentration under the 600 mg/L. While uranium concentration was 450 mg/L, the adsorption rate of two strains reached the maximum value (88.50%). The maximum adsorption capacity of B. subtilis and S. uvarum were 382.86 mgU/g and 113.04 mgU/g, respectively. In the real application, firstly, S. uvarum could be used to decrease the high concentration of uranium, and then B. subtilis was taken for further adsorption to achieve optimal effect of adsorption.

scholarly journals Comparison of mechanical properties of geopolymers from different raw materials with the addition of waste glass

2021 ◽  
pp. 252-261
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Fossil Fuels ◽  
Raw Materials ◽  
Waste Glass ◽  
Industrial Wastes ◽  
Raw Material ◽  
Sustainable Construction ◽  
Alkali Activation ◽  
Compressive And Flexural Strengths

The combustion of fossil fuels results in creating a lot of solid wastes such as fly ash and slag. However, these environmentally unfriendly materials can be used as a raw material for alkali activation – geopolymerization. Although these wastes have been successfully used in industrial production for several decades, its use does not achieve the level of its potential. Today, to achieve a sustainable construction industry, alternative cement has been extensively investigated. Geopolymer (GP) is a kind of material that is obtained from the alkaline activator, and it can be produced from industrial wastes or by-products. The aim of this work was to describe the improvement of mechanical properties of alkali-activated binders – geopolymers made of fly ash and blast furnace slag. The effect of the addition of waste glass in three different values feed into fly ash or GGBFS, and its impact on mechanical properties (compressive and flexural strengths) of geopolymers was examined. The highest value of compressive strength was achieved with 20% waste glass addition to a fly ash sample on 90th day 58,9 MPa. The waste glass was added in the form of broken and crushed glass particles.

scholarly journals Enhanced Phosphorus Removal from Wastewater Using RSPRC and a Novel Reactor

2020 ◽  
Vol 10 (10) ◽  
pp. 3629
Author(s):  
Yan Liu ◽  
Limin Zhang ◽  
Rajendra Prasad Singh
Keyword(s):  
Fly Ash ◽  
Phosphorus Removal ◽  
Soil Phosphorus ◽  
Steel Slag ◽  
Industrial Wastes ◽  
Phosphorus Concentration ◽  
Previous Knowledge ◽  
Foaming Agent ◽  
Adsorption Performance ◽  
As Adsorption

Fly ash and steel slag both have a good adsorption performance and many researchers have mixed the two to make effective adsorbents. Based on previous knowledge, activated clay is added in this study. In order to deep dephosphorize wastewater, two different industrial wastes (steel slag, fly ash) are blended into activated clay as adsorption substrates, supplemented with a binder and foaming agent to prepare a Residue and Soil Phosphorus Removal Composite (RSPRC). This is prepared to carry out experimental research on the decolorization effect and phosphorus removal characteristics of RSPRC. Meanwhile, a self-developed concentric circular diversion wall adsorption reactor is implemented to study the effect of phosphorus removal. It is found that the addition of activated clay can significantly improve the phosphorus removal performance. The results suggest that the phosphorus concentration in the effluent from the reactor can be stably reduced to below 0.10 mg/L. The concentric circular diversion wall adsorption reactor and RSPRC will have broad application prospects in phosphorus removal.

scholarly journals Steel slag as low-cost adsorbent for the removal of phenanthrene and naphthalene

2018 ◽  
Vol 36 (3-4) ◽  
pp. 1160-1177 ◽  
Author(s):  
Liyun Yang ◽  
Xiaoming Qian ◽  
Zhi Wang ◽  
Yuan Li ◽  
Hao Bai ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Low Cost ◽  
Steel Slag ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Batch Experiments ◽  
Obvious Effect ◽  
X Ray ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model

This study investigates the removal effectiveness and characteristics of phenanthrene and naphthalene using low-cost steel slag with batch experiments. The adsorption characteristics of steel slag were measured and analysed using X-ray fluorescence, X-ray diffraction, and Fourier transform infrared spectroscopy. The batch experiments investigated the effect of the time gradient, pH, and steel slag dosage gradient on the adsorption of the steel slag. The results show that with time and dosage of steel slag increased, the adsorption capacity of phenanthrene and naphthalene increased and gradually became balanced, but pH had no obvious effect on the adsorption of phenanthrene and naphthalene. The Langmuir isotherm model best describes the phenanthrene and naphthalene removal by the steel slag, which shows the adsorption occurring in a monolayer. The maximum adsorption capacity of the steel slag to phenanthrene and naphthalene is 0.043 and 0.041 mg/g, respectively. A pseudo-first-order kinetic model can better represent the adsorption of phenanthrene and naphthalene by steel slag. The research demonstrates that the steel slag has a certain adsorption capacity for phenanthrene and naphthalene.

Sintered Artificial Aggregate with New Correction Raw Materials

2015 ◽  
Vol 1124 ◽  
pp. 177-182
Author(s):  
Vit Cerný
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Raw Materials ◽  
Paper Industry ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Industrial Wastes ◽  
Raw Material ◽  
Waste Water Treatment Plant ◽  
By Products

Combustion of coal creates a high amount of by-products in heat power plants. The largest share occupies fly ash as solid mineral residuals. Global pressure grows currently for the use of energy by-products. Utilization as a raw material for production of artificial sintered aggregate is one of the ways to make optimal use of even low-quality fly ash. Environmental and economic reasons lead currently to trying to upgrade the technology, which will fully use of the principle of self-sintering process based on content of combustible substances.The amount of combustible substances is today increasing by coal as a primary and finite resource. There is also best way for utilization of industrial wastes that contain a suitable share of combustible substances for ensure the smooth running of sintering.The paper deals with laboratory verification of selected industrial wastes as a correction component in the sintered aggregate production technology. As an alternative raw materials were selected coal tailings, sludge from paper industry, sludge from waste water treatment plant and fly ash from municipal waste incineration plant. The aim of the study was to investigate the effect of corrective components to the quality of the resulting sintered aggregates.

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