scholarly journals Barrier effect of coal bottom ash-based geopolymers on soil contaminated by heavy metals

RSC Advances ◽  
2019 ◽  
Vol 9 (49) ◽  
pp. 28695-28703 ◽  
Author(s):  
Yiqie Dong ◽  
Min Zhou ◽  
Yuwei Xiang ◽  
Sha Wan ◽  
He Li ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Resource Utilization ◽  
Contaminated Soil ◽  
Bottom Ash ◽  
Alkali Activation ◽  
Barrier Effect ◽  
Coal Bottom Ash ◽  
Low Resource ◽  
Engineering Problems

Coal bottom ash (CBA) was modified on the basis of the engineering problems of low resource utilization of CBA and difficulty in treating HMS through alkali activation to synthesize geopolymers and solidify heavy metal-contaminated soil (HMS).

scholarly journals Optimization of pH, temperature and carbon source for bioleaching of heavy metals by Aspergillus flavus isolated from contaminated soil

2019 ◽  
Vol 42 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Sadia Qayyum ◽  
Ke Meng ◽  
Sidra Pervez ◽  
Faiza Nawaz ◽  
Changsheng Peng
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Aspergillus Flavus ◽  
Contaminated Soil ◽  
Ph Value ◽  
Optimal Conditions ◽  
Batch Experiments ◽  
Molecular Biological Analysis ◽  
One Step ◽  
Industrial Mining

Abstract Soil contamination with heavy metal content is a growing concern throughout the world as a result of industrial, mining, agricultural and domestic activities. Fungi are the most common and efficient group of heavy metal resistant microbe family which have potential for metal bioleaching. The use of filamentous fungi in bioleaching of heavy metals from contaminated soil has been developed recently. The current study intends to isolate a strain with the ability to degrade the pH value of the liquid medium. Identification results based on morphological and molecular biological analysis gave a 98% match to Aspergillus flavus. Batch experiments were conducted to select the optimal conditions for bioleaching process which indicated that 130 mg/ L sucrose, neutral pH and temperature of 30°C were more suitable during 15-day bioleaching experiments using A. flavus. In one-step bioleaching, the bioleaching efficiencies were 18.16% for Pb, 39.77% for Cd and 58.22% for Zn+2, while two-step bioleaching showed efficiencies of 16.91% for Pb, 49.66% for Cd and 65.73% for Zn+2. Overall, this study indicates that bioleaching of heavy metals in contaminated soil using A. flavus has the potential for contaminated soil remediation.

scholarly journals Kestabilan Inokulan Azotobacter selama Penyimpanan pada Dua Suhu

2012 ◽  
Vol 14 (1) ◽  
pp. 52
Author(s):  
Reginawanti Hindersah ◽  
Rija Sudirja
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Root Growth ◽  
Contaminated Soil ◽  
Metal Uptake ◽  
Room Temperature ◽  
Heavy Metal Uptake ◽  
Total N ◽  
The Stability ◽  
Temperature Storage

Azotobacter might be used as biological agents in bioremediation of heavy metal-contaminated soil since this rhizobacteria produceexopolysachharides (EPS) that mobilize soil heavy metals, and phytohormones that regulate root growth. So that heavy metal uptake bythe roots could be increased. The objective of this research was to verify the stability of EPS and phytohormones in Azotobacter liquidinoculants during four months in different temperature storage. Liquid inoculants has been produced in EPS-induced media and stored in200C and room temperature (24-270C) during four months. The results showed that the better temperature storage was room temperatureinstead of 20 0C since pH, total N, and EPS and phytohormones content was relatively stable during storage.

scholarly journals Phytoremediation of Special Metals in Emerging Industries

2018 ◽  
Vol 1 (3) ◽  
Author(s):  
T Y TEH ◽  
Min-Hao Wu ◽  
Kf Chen ◽  
Yp Peng
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Growth Rate ◽  
Environmental Factors ◽  
Contaminated Soil ◽  
Morphological Analysis ◽  
Energy Crop ◽  
Emerging Industries ◽  
Incremental Growth ◽  
Conventional Methods

This project is carried out to assess the remediation effect on soil contaminated by molybdenum (Mo), one of heavy metals, through the use of an energy crop, sunflowers. This project explores the integration of phytohormones and chelates in the phytoremediation of soils contaminated by heavy metals, and further assesses the operational measures of remedying heavy-metal contaminated soil with sunflowers, in addition to the related environmental factors. Then the project explores phytohormones and heavy metals on the growth scenario explants (explants morphological analysis) through the experiment. The results indicate that GA3 can increase the growth rate of the plants. The average incremental growth of the heavy-metal-added-only group is 21.0 cm; of the GA3-added group it is 21.9 cm; of the EDDS-added group, it is 20.3 cm; of the GA3+ EDDS-added group, it is 21.7 cm. Compared with the conventional methods of phytoremediation, these integrated measures can actually spur the growth of plants. 

Zeolite Synthesis from Coal Bottom Ash for Recycling as an Absorbent of Heavy Metals

2006 ◽  
pp. 626-629
Author(s):  
Ji Whan Ahn ◽  
Gi Chun Han ◽  
Kwang Suk You ◽  
Nam Il Um ◽  
Hee Chan Cho
Keyword(s):  
Heavy Metals ◽  
Bottom Ash ◽  
Zeolite Synthesis ◽  
Coal Bottom Ash

Study on Plant-Microbial Remediation of Antibiotic and Heavy Metal Contaminated Soil

2014 ◽  
Vol 587-589 ◽  
pp. 816-819 ◽  
Author(s):  
Ning Chen ◽  
Su Chen ◽  
Lei Chao ◽  
Li Na Sun ◽  
Dong Mei Zheng ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Contaminated Soil ◽  
Research Priorities ◽  
Influential Factors ◽  
Future Research ◽  
Advantages And Disadvantages ◽  
Microbial Remediation ◽  
Heavy Metals Pollution ◽  
Selection Of

In the recent years, antibiotics and heavy metals have become common pollutants in soil. Plant-microbial remediation is promising for the management of antibiotics and heavy metals pollution in soil. This paper talks about the mechanization of plant-microbial remediation, finds the advantages and disadvantages about plant-microbial technology, summarizes the method of selection of the plant and microbial, influential factors, and discusses the future research priorities of plant-microbial remediation.

Fuzzy Evaluation of Optimum Gasification Temperature of Sludge Derived Fuel

2013 ◽  
Vol 726-731 ◽  
pp. 1239-1244
Author(s):  
Chun Ping Li
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Bottom Ash ◽  
Gas Production ◽  
Gas Content ◽  
Fuzzy Evaluation ◽  
Combustible Gas ◽  
Gasification Temperature

A series of gasification experiments of sludge RDF was made by using independently developed gasification device. When sludge RDF was gasified at 300°C ~900°C, the trend of gas production was increased continuously with the peak of 65.5% at 900°C and the trend of bottom ash decreased continuously with the peak of 25.6% at 900°C, but tar yield firstly increased and then decreased, reaching maximum at 600 °C, about 31%. With the increase of the gasification temperature, combustible gas content of CO2 decreased significantly, while H2 , CO and CH4 increased. At 500 °C, heavy metal of Hg entirely evaporated into the atmosphere, volatile peak of Pb, Cd, As, Cu was in 800°C, volatile sort of 8 heavy metals was : Hg>Pb>Cd> As>Zn>Cu>Cr>Ni. The optimal gasification temperature for sludge RDF is 700 °C when the volatilization rate of heavy metals was moderate, gas production was higher and tar produced was smaller.

scholarly journals Evaluation of Acid Leaching on the Removal of Heavy Metals and Soil Fertility in Contaminated Soil

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Chen-Yao Chu ◽  
Tzu-Hsing Ko
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Seed Germination ◽  
Soil Fertility ◽  
Sequential Extraction ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Germination Rate ◽  
Extraction Procedure ◽  
Acid Leaching

Heavy metal-contaminated soils were leached with various acid reagents, and a series of treatments was assessed to understand soil fertility after acid leaching. Aqua regia digestion and a five-step sequential extraction procedure were applied to determine heavy metal distribution. The average total concentrations of Zn, Cd, Cu, and Pb for contaminated soil were 1334, 25, 263, and 525 mg·kg−1 based on the ICP/AES quantitative analysis. Other than Pb extracted by H2SO4, over 50% removal efficiency of other heavy metals was achieved. A five-step sequential extraction revealed that the bound-to-carbonate and bound-to-Fe-Mn oxides were the major forms of the heavy metals in the soil. The addition of organic manure considerably promoted soil fertility and increased soil pH after acid leaching. Seed germination experiments demonstrated that after acid leaching, the soil distinctly inhibited plant growth and the addition of manure enhanced seed germination rate from 35% to 84%. Furthermore, the procedure of soil turnover after acid leaching and manure addition greatly increased seed germination rate by 61% and shortened the initial germination time. Seed germination in untreated soil was superior to that in acid-leached soil, illustrating that the phytotoxic effect of acid leaching is more serious than that of heavy metals.

Using Regional Characteristic Amendments to Modify Heavy Metal Contaminated Soil of Guangxi, South China

2014 ◽  
Vol 675-677 ◽  
pp. 654-657
Author(s):  
Qiu Jun Li ◽  
Rui Jie Zhang ◽  
Ying Hui Wang ◽  
Da Rong Li
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Organic Matter ◽  
Soil Ph ◽  
South China ◽  
Contaminated Soil ◽  
Red Mud ◽  
Great Influence ◽  
Regional Characteristic ◽  
Coconut Husk

In this study we compared the efficiency of four kinds of amendments (silkworm excrement, coconut husk, red mud, sepiolite) and their mixtures to immobilize the heavy metals present in a contaminated acidic soil (Pb:420 mg ·kg−1; Zn :334 mg· kg−1) and to influence several enzymatic activities. The results showed that, silkworm excrement, coconut husk and their mixtures, which had high pH and/or high content of organic matter, reduced exchangeable Pb in the soil by 18% to 46%, and reduced available Zn by 24% to 35%, which was more efficacious than single sepiolite. The complex of silkworm excrement and red mud had a great influence on soil pH, while coconut husk increased the content of organic matter in soil significantly.

scholarly journals Utilization of Coal Bottom Ash and Cattle Manure as Soil Ameliorant on Acid Soil and Its Effect on Heavy Metal Content in Mustard (Brassica juncea)

2017 ◽  
Vol 22 (2) ◽  
pp. 87-95
Author(s):  
Rika Yayu Agustini ◽  
Iskandar Iskandar ◽  
Sudarsono Sudarsono ◽  
Jaswadi Jaswadi ◽  
Gusti Wahdaniyah
Keyword(s):  
Heavy Metal ◽  
Brassica Juncea ◽  
Acid Soil ◽  
Bottom Ash ◽  
Chemical Properties ◽  
Cattle Manure ◽  
Soil Chemical Properties ◽  
Total N ◽  
Coal Bottom Ash ◽  
Soil Ameliorant

Coal bottom ash and cattle manure can be used as soil ameliorant. The application of coal bottom ash and cattle manure can improve the soil chemical properties, such as pH and the amounts of available nutrients in soil. The objective of the study was to understand the effect of coal bottom ash and cow manure application on soil chemical properties and heavy metal contents in soil and mustard (Brassica juncea).  A pot experiment was conducted in a greenhouse, including three treatment factors, i.e. age of coal bottom ash (fresh, 4 months and 2 years), dose of coal bottom ash, i.e. 0, 40 and 80 Mg ha-1, and dose of cattle manure, i.e. 0 and 10 Mg ha-1. The results show that the application of coal bottom ash and cattle manure increased the pH and the amounts of total-N, available-P and exchangeable cations (K, Ca and Mg) of the soil. The application of coal bottom ash increased the amounts of Pb, Cd and Co in the soil, but did not increase the amounts of Pb and Co in mustard, while the application of cattle manure increased the amount of Cd both in soil and mustard.  Keywords: Coal bottom ash, cattle manure, heavy metal, mustard, soil ameliorant

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