scholarly journals Synergistic Passivation of Fly Ash and TMT on Heavy Metals in Sewage Sludge

2018 ◽  
Vol 10 (12) ◽  
pp. 4731 ◽  
Author(s):  
Dong-Fang Wang ◽  
Shi-He Li ◽  
Xian-Qing Wang ◽  
Ling-Xu Li ◽  
Xuan Zhang
Keyword(s):  
Heavy Metals ◽  
Adverse Effect ◽  
Fly Ash ◽  
Sewage Sludge ◽  
Ion Exchange ◽  
Growth Process ◽  
Trisodium Salt ◽  
Treatment And Disposal ◽  
Chinese Standard ◽  
Ryegrass Growth

Large amounts of fly ash and sewage sludge are produced annually in China. The treatment and disposal of such byproducts have become urgent problems that need to be solved. In order to achieve the possibility of realizing land applications for sewage sludge, fly ash and trimercapto-s-triazine trisodium salt (TMT) were used as immobilizing agents, and their passivation effects on four kinds of heavy metals (Cu, Ni, Pb, and Zn) were evaluated. The results showed that the resulting sewage sludge met Chinese standard GB/T23486-2009. When the addition was 10–20% fly ash or 0.4–0.6% TMT, the optimum immobilization effect was obtained. The synergistic passivation of 20% fly ash +0.5% TMT was superior to that of either fly ash or TMT alone. The addition of sewage sludge during the ryegrass growth process significantly increased the plant height, the number of tillers, the chlorophyll content, and the biomass of the ryegrass over the brown soil. The adverse effect of the heavy metals on the ryegrass growth could be alleviated by the passivation effect of fly ash and TMT. The immobilization performance of the fly ash was mainly due to the formation of precipitation and the ion exchange, while that of TMT was due to chelate precipitation.

Influence of Decreasing Supplementation to Transformation of Chemical Forms of Ni, Zn and Cu During Composting of Sewage Sludge

2021 ◽  
Vol 23 ◽  
pp. 580-593
Author(s):  
Robert Sidełko
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Organic Carbon ◽  
Ion Exchange ◽  
Beneficial Effect ◽  
Sequential Extraction ◽  
Nitrogen Concentration ◽  
Chemical Forms ◽  
N Value ◽  
Mobile Forms

This paper pertains to the influence of decreasing supplementation to transformation of chemical forms of Ni. Zn and Cu during composting of sewage sludge. A universally used supplementing material constituting a rich source of organic carbon is straw. Addition of straw to sewage sludge is aimed at increasing C/N proportion up to at least 15 due to the risk of formation of toxic forms of nitrogen, concentration of which in sewage sludge is exceptionally high. We have presented in this paper the results of speciation research of three elements applying Tessier’s sequential extraction. It’s been proven that decreasing of straw share in the composted mixture with sewage sludge down to the level of C/N value below the admissible value, has a beneficial effect on the allocation of tested heavy metals towards the forms that are permanently bound in compost matrix. A systematic increase of organic (IV) and residual (V) fractions share and decrease of mobile forms of heavy metals content in bioavailable fractions i.e. ion-exchange (I) and carbonate (II) has been ascertained.

scholarly journals Stabilization of Municipal Solid Waste Fly Ash, Obtained by Co-Combustion with Sewage Sludge, Mixed with Bottom Ash Derived by the Same Plant

2020 ◽  
Vol 10 (17) ◽  
pp. 6075
Author(s):  
Ahmad Assi ◽  
Fabjola Bilo ◽  
Alessandra Zanoletti ◽  
Laura Borgese ◽  
Laura Eleonora Depero ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Sewage Sludge ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Coal Fly Ash ◽  
Bottom Ash ◽  
Solid Material ◽  
Flue Gas Desulfurization ◽  
Stabilization Method

This study presents an innovative stabilization method of fly ash derived from co-combustion of municipal solid waste and sewage sludge. Bottom ash, obtained from the same process, is used as a stabilizing agent. The stabilization method involved the use of two other components—flue gas desulfurization residues and coal fly ash. Leaching tests were performed on stabilized samples, aged in a laboratory at different times. The results reveal the reduction of the concentrations of heavy metals, particularly Zn and Pb about two orders of magnitude lower with respect to fly ash. The immobilization of heavy metals on the solid material mainly depends on three factors—the amount of used ash, the concentrations of Zn and Pb in as-received fly ash and the pH of the solution of the final materials. The inert powder, obtained after the stabilization, is a new eco-material, that is promising to be used as filler in new sustainable composite materials.

Effects on Speciation of Ni & Cd in Sewage Sludge during Composting only and Co-Composting with Fly Ash Added

2012 ◽  
Vol 209-211 ◽  
pp. 1245-1252
Author(s):  
Zheng Zhong Zeng ◽  
Xiao Li Wang ◽  
Yu Pan ◽  
Zhong Ren Nan
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Sewage Sludge ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Unstable State ◽  
Land Utilization ◽  
Major Barrier ◽  
Exchangeable Fraction ◽  
State Content

The land use has become the international mainstream and the favorable direction to dispose the municipal sewage sludge in recent years. The heavy metals, however, are the major barrier that limit the land utilization. Batch aerobic composting experiments were conducted to investigate the effect of composting and co-composting with fly ash on the shape of the heavy metals (Ni & Cd) in sludge by using the sawdust to regulate the C/N ratio. Results have shown that co-composting with fly ash can significantly change Ni & Cd species distribution, leading unstable state content of Ni lower than composting only. However, the result is not as good as composting only in terms of Cd. At the same time the fly ash dosage equaling 14% of the dry sludge mass was the optimized quantity to guarantee the lowest exchangeable fraction amount of the two heavy metals.

scholarly journals Study on passivation of heavy metals in sewage sludge with fly ash

2018 ◽  
Vol 188 ◽  
pp. 012059
Author(s):  
D F Wang ◽  
X Q Wang ◽  
L X Li ◽  
X Zhang
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Sewage Sludge

Leaching Characteristics of Manganese and Iron from Artificial Soil

2012 ◽  
Vol 518-523 ◽  
pp. 2568-2571
Author(s):  
Hong Ling Zhang ◽  
Li Na Sun ◽  
Tie Heng Sun
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Sewage Sludge ◽  
Artificial Soil ◽  
Amorpha Fruticosa ◽  
Leaching Characteristics ◽  
Leaching Experiment ◽  
Fe And Mn ◽  
Mn Concentration ◽  
Mn Concentrations

A leaching experiment was carried out over a period of 90 days to determine the manganese (Mn) and iron (Fe) leaching characteristics from artificial soils composed of sewage sludge and fly ash. The leachates of artificial soils were collected every 15 days and the concentration of manganese and iron in leachates of the artificial soil was measured. Results showed that the concentration of Fe and Mn in leachates of artificial soils got to a stable level by the end of the experiment. Moreover, plant Robina pseudoacacia and Amorpha fruticosa had different effect on the leachate Fe and Mn concentration. Robina pseudoacacia resulted in higher leachate Fe concentration, while Amorpha fruticosa resulted in higher Mn concentration. However, the leachate Fe and Mn concentrations from artificial soils was high, and it will also be transported to the surface and ground water. Therefore, some measures should be taken to reduce the concentration of heavy metals in the leachates before these artificial soils being applied on the ecological rehabilitation in mine spoil areas.

Competitive adsorption behavior of selected heavy metals in three soil types of India amended with fly ash and sewage sludge

2003 ◽  
Vol 44 (3) ◽  
pp. 363-370 ◽  
Author(s):  
H. Veeresh ◽  
S. Tripathy ◽  
D. Chaudhuri ◽  
B. R. Hart ◽  
M. A. Powell
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Sewage Sludge ◽  
Competitive Adsorption ◽  
Adsorption Behavior ◽  
Soil Types
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