scholarly journals Post-treatment of landfill leachate using rice husk ash as adsorbent medium

2019 ◽  
Vol 14 (4) ◽  
pp. 1
Author(s):  
Josiane Pinheiro Farias ◽  
Larissa Loebens ◽  
Carolina Faccio Demarco ◽  
Tito Roberto Sant'Anna Cadaval Junior ◽  
Maurizio Silveira Quadro ◽  
...  
Keyword(s):  
Rice Husk ◽  
Landfill Leachate ◽  
Rice Husk Ash ◽  
Fixed Bed ◽  
Oxygen Demand ◽  
Post Treatment ◽  
Rupture Time ◽  
Efficient Treatment ◽  
Chemical Systems ◽  
Apparent Color

Sanitary landfill is the most disposal method for urban solid waste. However, in the process of organic matter degradation, a dark-colored liquid with high potential for polluting is produced, necessitating an efficient treatment before its discharge into watercourses. Several technologies can be used in the treatment, such as biological and physico-chemical systems. The activated carbon produced from agricultural residues - rice husk ash (RHA), appears as an alternative treatment, mainly for color reduction in landfill leachate. This study determined the best operational condition for the slurry treatment using a fixed-bed column. The column was filled with activated RHA and support material (sand). The column heights studied were 5 cm (C1) and 20 cm (C2) of adsorbent. The column with 20 cm of RHA and sand intercalated with the coal layer showed better efficiency in removal of the chemical oxygen demand (COD), with COD removal efficiency of 88.91% and rupture time of 120 min. The removal of apparent color was 87.40% with the rupture time of 40 min and true color removal of 86.64% with rupture time of 50 min. Activated rice husk ash was shown to be promising for post-treatment of the leachate with substantial efficiency.

scholarly journals Potential of Functionalized-Rice-Husk Ash for Purification of Tannery-yard Liming Effluent

2019 ◽  
Vol 11 (3) ◽  
pp. 373-381
Author(s):  
M. Abdulla-Al-Mamun ◽  
B. R. Goush
Keyword(s):  
Rice Husk ◽  
Suspended Solids ◽  
Rice Husk Ash ◽  
Activated Carbons ◽  
Oxygen Demand ◽  
Effluent Treatment ◽  
Total Alkalinity ◽  
Cooh Group ◽  
Filtration Process

The natural rise-husk charcoal was made by burned in a furnace at 230 °C. Carboxylic group (-COOH) was functionalized onto the charcoal by using oxalic acid in situ process. Fourier Transform Infrared Spectroscopy (FTIR) and morphology by Scanning Electron Microscope (SEM) demonstrated that the COOH-group was successfully functionalized on the charcoal and the particles were porous. The COOH-activated charcoal was applied for liming effluent treatment through a filtration media. Eight environmental load parameters was determined by the standard method. The results were compared with the standard permissible limits set by Inland Surface Water-Bangladesh Standards (ISW–BDS-ECR, 1997). It has been observed that the rice husk based activated carbons dramatically reduce the pollutants to permissible level. The removal efficiency of pH, Electrical Conductivity (EC), Total Suspended Solids (TSS), Total Dissolved Solids (TDS), Biological Oxygen Demand in 5 days at 20 °C (BOD5), Chemical Oxygen demand (COD), Total Alkalinity, S2- from liming effluent up to 40.0%, 85.89%, 98.8%, 81.32%, 96.74%, 78.6%, 97.15% and 79.61% respectively. In conclusion, the liming effluent simply recycled by filtration process and can be used for industrial purpose.

scholarly journals Effect of rice husk ash mass on sustainability pyrolysis zone of fixed bed downdraft gasifier with capacity of 10 kg/hour

2017 ◽  
Author(s):  
Adi Surjosatyo ◽  
Imaduddin Haq ◽  
Hafif Dafiqurrohman ◽  
Felly Rihlat Gibran
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Fixed Bed ◽  
Downdraft Gasifier

Experimental Investigation on Flame Propagation Speed of Rice Husk Ash in Fixed Beds

2014 ◽  
Vol 353 ◽  
pp. 96-100
Author(s):  
Chen Huang ◽  
Yi Miao Zhu ◽  
Hou Lei Zhang ◽  
Xin Zhi Liu
Keyword(s):  
Flame Propagation ◽  
Rice Husk ◽  
Large Scale ◽  
Rice Husk Ash ◽  
Fixed Bed ◽  
Propagation Speed ◽  
Low Carbon ◽  
Experimental Conditions ◽  
Long Time ◽  
Fixed Beds

Rice husk ash (RHA) is the product of rice husk pyrolysis or combustion, which contains inherent ash in original rice husk and non-converted fixed carbon. Due to large amounts of inherent silicon dioxide in rice husk, the decarbonized residue of RHA has great value as industrial materials. One basic method to remove carbon from RHA is roasting. Because of low carbon content in RHA and low roasting reaction velocity, the roasting process takes a long time. In this case, fixed-bed roasting is suitable for removing carbon from RHA. In the present work, experimental study on RHA decarbonization is conducted based on a specially-designed multi-section fixed-bed roasting. The experimental results show that under the experimental conditions, the flame propagation spread of RHA in fixed beds is in the range 0.833 to 0.121mm/s. The results documented in this paper provide the basis for further developing large-scale engineering devices.

Fixed-bed adsorption of methylene blue by rice husk ash and rice husk/CoFe2O4nanocomposite

2015 ◽  
Vol 57 (27) ◽  
pp. 12793-12803 ◽  
Author(s):  
Kang-Kang Yan ◽  
Jiao Huang ◽  
Xue-Gang Chen ◽  
Shu-Ting Liu ◽  
Ao-Bo Zhang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Fixed Bed ◽  
Fixed Bed Adsorption

Silver Recovery and Reduction of Chemical Oxygen Demand from Used Fixing Reagent of X-Ray Laboratory Using Electrolysis Coupled with Adsorption onto Crab-Shell Chitosan and Black Rice-Husk Ash

2019 ◽  
Vol 824 ◽  
pp. 45-51
Author(s):  
Ratana Sananmuang ◽  
Jirapa Yodphet ◽  
Wipharat Chuachuad Chaiyasith
Keyword(s):  
Chemical Oxygen Demand ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Oxygen Demand ◽  
Atomic Absorption Spectrophotometry ◽  
Crab Shell ◽  
Black Rice ◽  
Silver Recovery ◽  
X Ray ◽  
Flame Atomic Absorption

Used fixing reagent, from X-ray laboratories of hospitals is often contaminated with numerous chemicals. Silver (Ag (I)) ion is the major contaminant present in used fixing reagent. This work determined the Ag (I) ion and chemical oxygen demand (COD) in used fixing reagent of X-ray laboratory. The removal of Ag (I) ion was done by electrolysis and followed with the adsorption onto crab shell chitosan (CSC) and black rice husk ash (BRHA). The Ag (I) ions in an used fixing reagent was analyzed by flame atomic absorption spectrophotometry (FAAS) at λ = 540 nm. The COD was measured by reflux technique and the results indicated that the initial concentrations of Ag (I) ions and COD values were 5,634.66 ± 179.74 mg L-1 and 182,821.28 ± 5759.04 mg L-1, respectively. The optimum voltage and time for electrolysis were 2 volts and 10 hrs. After the electrolysis had been done, 82.28% of the Ag (I) ions were removed, while the COD was reduced by 51.76%. After the adsorption experiment was applied, 72.16% of the Ag (I) ions were adsorbed onto CSC and 51.83%. onto BRHA. The COD was reduced 37.04% and 34.08% by CSC and BRHA, respectively. Therefore, these two techniques, electrolysis and adsorption, are appropriated techniques for Ag (I) ions recovery and the COD reduction of the used fixing reagent discharged from X-ray laboratories.

scholarly journals Photodegradation of Methylene Blue Mediated by Rice Husk Ash (RHA)-TiO2 Composite

1970 ◽  
Vol 46 (1) ◽  
pp. 17-26
Author(s):  
S Ahmed ◽  
Shirin A Jahan ◽  
M Zaman ◽  
Z Yeasmin ◽  
M Ahsan
Keyword(s):  
Methylene Blue ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Oxygen Demand ◽  
Degradation Process ◽  
Halogen Lamp ◽  
First Order Kinetics ◽  
Mineralization Processes ◽  
Parallel Measurement ◽  
Sun Light

A photo-catalytic composite material incorporating rice husk ash (RHA) and TiO2 (RHA:TiO2 = 75:25 and 50:50) has been developed and used to investigate the photodegradation of the well-known dye pollutant, methylene blue (MB). Photodegradation was monitored in the dark and under illumination using a halogen lamp as well as sun light to facilitate photodegradation. Both the dark reaction and photo- mineralization processes were evaluated in terms of kinetic study which revealed the validation of first-order kinetics. A parallel measurement of chemical oxygen demand (COD) was also performed for a better understanding of the degradation process. The higher degradation rate in the sun light offers an easy-to-use and environment friendly approach for the treatment of dye stuffs. However, the overall phototdegradation mechanism involved the participation of both the anodic (h+ consumption) and cathodic (e- consumption) processes which were responsible for the degradation of MB and consumption of dissolved oxygen respectively. Key words: Photo-degradation; Composite plate; Rice husk ash, Methylene blue; Adsorption. DOI: http://dx.doi.org/10.3329/bjsir.v46i1.8100 Bangladesh J. Sci. Ind. Res. 46(1), 17-26, 2011

scholarly journals Can electrocoagulation be an effective post-treatment option for SBR treated landfill leachate and municipal wastewater mixture?

2020 ◽  
Vol 10 (1) ◽  
pp. 86-95
Author(s):  
Shubhrasekhar Chakraborty ◽  
Pratap Kumar Mohanty ◽  
Jawed Iqbal ◽  
R. Naresh Kumar
Keyword(s):  
Landfill Leachate ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Post Treatment ◽  
Treated Wastewater ◽  
Electrode Spacing ◽  
Reduction Efficiency ◽  
Effective Option ◽  
Electrocoagulation Process

Abstract A combined process of sequencing batch reactor (SBR) and electrocoagulation for co-treatment of landfill leachate and municipal wastewater was assessed. SBR was used in the first instance for co-treatment of 20% (v/v) landfill leachate and municipal wastewater mixture. Effluent from SBR was subjected to electrocoagulation for post-treatment, with aluminum as sacrificial anode and stainless steel as cathode. Direct current at a density of 257 A/m2 was applied during the electrocoagulation process. In electrocoagulation, spacing between the two electrodes was varied at 5 and 7 cm to assess its influence on treatment efficiency. SBR was effective to remove 65% chemical oxygen demand (COD), 77% total suspended solids (TSS), 89% ammonia, 80% nitrate, 64% phosphate and post-treatment by electrocoagulation resulted in an overall 98% COD, 98% TSS and 99% ammonia, nitrate and phosphate reduction efficiency with 5 cm of electrode spacing. Respectively, final COD, ammonia and TSS was 37, 1 and 98 mg/L after 150 min of electrocoagulation which met the Indian standards for the discharge of treated wastewater. The results highlight that SBR followed by electrocoagulation as post-treatment can be an effective option for the treatment of landfill leachate and municipal wastewater mixture.

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