Humic acids complexes with heavy metals in municipal solid wastes and compost

2013 ◽  
pp. 249-255 ◽  
Author(s):  
B Janowska
Keyword(s):  
Heavy Metals ◽  
Humic Acids ◽  
Solid Wastes ◽  
Municipal Solid Wastes

Conditioning of oily sludges with municipal solid wastes incinerator fly ash

1997 ◽  
Vol 35 (8) ◽  
pp. 231-238 ◽  
Author(s):  
Tay Joo Hwa ◽  
S. Jeyaseelan
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Specific Resistance ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Solid Wastes ◽  
Municipal Solid Wastes ◽  
Capillary Suction ◽  
Optimum Dosage

Conditioning of sludges improves dewatering characteristics and reduces the quantity of sludge to be handled. Anaerobic digested sludge collected from a sewage treatment plant contained 1.8% to 8% oil. The increase of specific resistance and capillary suction time (CST) with increasing oil content observed in these samples indicates the interference of oil in dewatering. It has been found that addition of municipal solid wastes incinerator fly ash decreases the specific resistances and capillary suction times of oily sludges rapidly up to 3% dosage. Beyond 3% fly ash, the decrease is less significant and the solids content in the sludge cake increases. This optimum dosage remains the same for sludges with varying oil contents from 1.8% to 12%. The total suspended solids of filtrate decreases with fly ash dosage but the toxic concentrations of heavy metals increases considerably. However at the optimum dosage of 3%, concentrations of heavy metals are within the limits for discharging into the sewers. The correlations of CST with the dewatering characteristics such as specific resistance, filter yield and corrected filter yield are established. These correlations can be used to obtain a quick prediction on dewaterability.

scholarly journals Recycling of Waste Materials for Stabilizing Ash from Co-Combustion of Municipal Solid Wastes with an Olive By-Product: Soil Leaching Experiments

Soil Systems ◽  
2020 ◽  
Vol 4 (2) ◽  
pp. 34
Author(s):  
Despina Vamvuka ◽  
Stelios Alexandrakis ◽  
George Alevizos ◽  
Antonios Stratakis
Keyword(s):  
Heavy Metals ◽  
Fixed Bed ◽  
Major And Trace Elements ◽  
Solid Wastes ◽  
Waste Materials ◽  
The European Union ◽  
Meat And Bone Meal ◽  
Bone Meal ◽  
Municipal Solid Wastes ◽  
Lignite Fly Ash

In the context of the current environmental policies of the European Union promoting the recycling and reuse of waste materials, this work aimed at investigating the environmental impact of ashes produced from the co-combustion of municipal solid wastes with olive kernel in a fixed bed unit. Lignite fly ash, silica fume, wheat straw ash, meat and bone meal biochar, and mixtures of them were used as stabilizing ash materials. All solids were characterized by physical, chemical and mineralogical analyses. Column leaching tests of unstabilized and stabilized ash through a quarzitic soil were conducted, simulating field conditions. pH, electrical conductivity, chloride, sulphate and phosphate ions, major and trace elements in the leachates were measured. The results showed that alkaline compounds were partially dissolved in water extracts, increasing their pH and thus decreasing the leachability of heavy metals from the ash. Cr leached from unstabilized ash reached a hazardous level. Upon the stabilization of ash, the concentrations of heavy metals in the extracts were reduced between 9% and 100%, and were below legislation limits for disposal, apart from Cr. The latter was achieved only when meat and bone meal biochar was used as stabilizer. Entrapment of ash elements was assigned to the amorphous silica and to the phosphates of the stabilizing materials, as well as complexed silicates formed during the process.

Physico-Chemical properties, heavy metals and their relations in cultivated landfill soils dumped with municipal solid wastes

2003 ◽  
Vol 49 (2) ◽  
pp. 163-170 ◽  
Author(s):  
A Mitra ◽  
P Bhattacharyya ◽  
K Chakrabarti ◽  
DJ Chattopadhyay ◽  
A Chakraborty
Keyword(s):  
Heavy Metals ◽  
Chemical Properties ◽  
Solid Wastes ◽  
Municipal Solid Wastes ◽  
Physico Chemical

Ecotoxicological status and risk assessment of heavy metals in municipal solid wastes dumpsite impacted soil in Nigeria

2019 ◽  
Vol 11 ◽  
pp. 100215 ◽  
Author(s):  
Joseph P. Essien ◽  
Edu D. Inam ◽  
Donald I. Ikpe ◽  
Godwin E. Udofia ◽  
Nsikak U. Benson
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Solid Wastes ◽  
Municipal Solid Wastes

scholarly journals HEAVY METALS IN STREAM SEDIMENTS AFFECTED BY A LANDFILL AND ASSOCIATED IMPACT ON GROUNDWATER QUALITY

2017 ◽  
Vol 43 (5) ◽  
pp. 2635 ◽  
Author(s):  
E. Koutsopoulou ◽  
P. Tsolis-Katagas ◽  
D. Papoulis
Keyword(s):  
Heavy Metals ◽  
Environmental Impact ◽  
Groundwater Quality ◽  
Stream Sediments ◽  
Soil Samples ◽  
Solid Wastes ◽  
Sanitary Landfill ◽  
Chemical Analyses ◽  
Municipal Solid Wastes ◽  
Run Off

Sanitary landfill facilities are essential to modern societies as repositories for municipal solid wastes. However, they always entrain a certain risk of environmental impact. For this reason monitoring is essential to their operation. In the present work, the environmental impact of such a landfill is studied. Soil samples were collected in and around the landfill and their mineralogy was studied. Top layers of stream sediments were collected to examine possible dispersion of pollutants in the environment. Chemical analyses showed enrichment in As, Cu, Zn, and Pb in the stream sediments compared to uncontaminated samples. The presence of anions such as chloride, sulphate and phosphate adsorbed on clay minerals suggest the interaction of stream sediments with run-off water from the landfill. The groundwater near the landfill site was characterised as not potable and not suitable for irrigation purposes, because some parameters such as NO3 - and Cl- were close or exceeded the permissible limits given by EE, EPA and WHO.

scholarly journals Investigating the Suitability of Grape Husks Biochar, Municipal Solid Wastes Compost and Mixtures of Them for Agricultural Applications to Mediterranean Soils

Resources ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 33
Author(s):  
Despina Vamvuka ◽  
Katerina Esser ◽  
Kostas Komnitsas
Keyword(s):  
Heavy Metals ◽  
Fixed Bed ◽  
Oxygen Demand ◽  
Solid Wastes ◽  
Municipal Solid Wastes ◽  
Leaching Potential ◽  
Combined Application ◽  
Agricultural Applications ◽  
Leaching Experiments ◽  
Mediterranean Soil

Present work aimed at evaluating the leaching potential of grape husks biochar, municipal solid wastes compost and their combined application as amendments of sandy Mediterranean soil, in order to assess their capability of releasing/retaining nutrients or heavy metals and therefore their suitability for agricultural applications. Grape husks biochar was produced by pyrolysis at 500 °C in a fixed bed unit. Column leaching experiments, simulating Mediterranean rainfall conditions, were conducted. For all compost/biochar/soil combinations, alkali and alkaline earth metals showed greater solubility, increasing the pH of the extracts and thus decreasing the leachability of heavy metals Cr, Cu, Zr and Sr. Biochar co-application with compost did not prevent the leaching of nitrates, phosphates or trace elements; however, it did lower the chemical oxygen demand and allowed the slower release of sodium, calcium and magnesium from soil. As compared to compost, addition of biochar to soil increased the concentration of potassium by 76%, whereas it decreased that of heavy metals in the leachates by 40%–95%. Grape husks biochar could serve as a better soil amendment than municipal solid wastes compost and if carefully managed could be used as liming agent or fertilizer on acidic soils.

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