scholarly journals THE EFFECT OF SOIL PH AND ZEOLITE APPLICATION ON LEAD (PB) IMMOBILIZATION ON CONTAMINATED SOIL

2021 ◽  
Vol 226 (09) ◽  
pp. 93-99
Author(s):  
Đàm Hà Lương Thanh ◽  
Đặng Thị Thái Hà
Keyword(s):  
Soil Ph ◽  
Contaminated Soil ◽  
Pb Immobilization

Ứng dụng zeolit trong xử lý môi trường đất đã được chứng minh là có tác dụng cố định các nguyên tố độc hại tiềm tàng (PTE) một cách hiệu quả. Độ pH của đất cũng có thể ảnh hưởng đến tính khả dụng của khả năng này. Hiện chưa có nghiên cứu nào kiểm tra tác động tương tác của zeolit và pH đất đối với sự cố định chì di động. Do đó, nghiên cứu này đã khảo sát ảnh hưởng của 2 loại zeolit là zeolit tự nhiên (N-Z) và zeolit lưỡng cực(Mg/Al LDH zeolite) (LDH-Z) được bổ sung với 3% trọng lượng, trong một thí nghiệm đối chứng (CT1) và 5 thí nghiệm với 5 chế độ pH đất (dao động từ 5.0 đến 9.0) trên năm dạng tồn tại của chì trong đất bị ô nhiễm chì. Kết quả cho thấy rằng các nghiệm thức được bổ sung N-Z và LDH-Z có khả năng cố đinh Pb di động, có thể thúc đẩy chuyển đổi chì ở dạngdi động thành các dạng ổn định. Sự cố định của chì được ghi nhận lớn nhất trong điều kiện pH của đất là 5,0 khi sử dụng cả zeolit tự nhiên và zeolit lưỡng cực, và khả năng cố định chì của vật liệu giảm khi giá trị pH đất tăng lên. Trong số các vật liệu được thí nghiệm, zeolit lưỡng cực cho tỷ lệ cố định Pb di động trong đất ô nhiễm cao hơn đáng kể so với zeolit tự nhiên. Lượng chì di động trong thí nghiệm đối chứng được báo cáo là 86,31%, và con số này giảm xuống 45,5% và 37,88% sau khi ủ với zeolit tự nhiên và zeolit LDH.

Effect of Soil pH on Immobilization of Lead by Phosphate-Solubilizing Bacteria

2014 ◽  
Vol 955-959 ◽  
pp. 3595-3599
Author(s):  
Li Ping Dong ◽  
Xiao Li Zhu ◽  
Ya Ya Xu ◽  
Jian Xia Zhang ◽  
Jiao Qin Liu ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Soil Ph ◽  
Contaminated Soil ◽  
Extraction Methods ◽  
Phosphate Solubilizing Bacteria ◽  
Chemical Forms ◽  
Selective Sequential Extraction ◽  
Remediation Efficiency ◽  
Phosphate Solubilizing ◽  
Pb Immobilization

Two phosphate-solubilizing bacteria were used to immobilize the lead in contaminated soil using the selective sequential extraction methods to detect the chemical forms of lead. The results showed that PSB 3-5-1-1 had higher ability of Pb immobilization compared with ID-a .The beat remediation efficiency could be obtained when pH is 6.

scholarly journals Fractionation of Heavy Metals in Multi-Contaminated Soil Treated with Biochar Using the Sequential Extraction Procedure

Biomolecules ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 448
Author(s):  
Mahrous Awad ◽  
Zhongzhen Liu ◽  
Milan Skalicky ◽  
Eldessoky S. Dessoky ◽  
Marian Brestic ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Ph ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Extraction Procedure ◽  
Sequential Fractionation ◽  
Relationship Of ◽  
The Relationship

Heavy metals (HMs) toxicity represents a global problem depending on the soil environment’s geochemical forms. Biochar addition safely reduces HMs mobile forms, thus, reducing their toxicity to plants. While several studies have shown that biochar could significantly stabilize HMs in contaminated soils, the study of the relationship of soil properties to potential mechanisms still needs further clarification; hence the importance of assessing a naturally contaminated soil amended, in this case with Paulownia biochar (PB) and Bamboo biochar (BB) to fractionate Pb, Cd, Zn, and Cu using short sequential fractionation plans. The relationship of soil pH and organic matter and its effect on the redistribution of these metals were estimated. The results indicated that the acid-soluble metals decreased while the fraction bound to organic matter increased compared to untreated pots. The increase in the organic matter metal-bound was mostly at the expense of the decrease in the acid extractable and Fe/Mn bound ones. The highest application of PB increased the organically bound fraction of Pb, Cd, Zn, and Cu (62, 61, 34, and 61%, respectively), while the BB increased them (61, 49, 42, and 22%, respectively) over the control. Meanwhile, Fe/Mn oxides bound represents the large portion associated with zinc and copper. Concerning soil organic matter (SOM) and soil pH, as potential tools to reduce the risk of the target metals, a significant positive correlation was observed with acid-soluble extractable metal, while a negative correlation was obtained with organic matter-bound metal. The principal component analysis (PCA) shows that the total variance represents 89.7% for the TCPL-extractable and HMs forms and their relation to pH and SOM, which confirms the positive effect of the pH and SOM under PB and BB treatments on reducing the risk of the studied metals. The mobility and bioavailability of these metals and their geochemical forms widely varied according to pH, soil organic matter, biochar types, and application rates. As an environmentally friendly and economical material, biochar emphasizes its importance as a tool that makes the soil more suitable for safe cultivation in the short term and its long-term sustainability. This study proves that it reduces the mobility of HMs, their environmental risks and contributes to food safety. It also confirms that performing more controlled experiments, such as a pot, is a disciplined and effective way to assess the suitability of different types of biochar as soil modifications to restore HMs contaminated soil via controlling the mobilization of these minerals.

scholarly journals IMMOBILIZATION OF EXCHANGEABLE CROMIUM IN A CONTAMINATED SOIL USING NATURAL ZEOLITE AS AN EFFECTIVE ADSORBENT

2020 ◽  
Vol 58 (5A) ◽  
pp. 10
Author(s):  
Van Minh Dang ◽  
Huu Tap Van ◽  
Thi Bich Hanh Nguyen ◽  
Dinh Vinh Nguyen ◽  
Thị Tuyet Nguyen ◽  
...  
Keyword(s):  
Soil Ph ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Natural Zeolite ◽  
Organic Matters ◽  
Amended Soils ◽  
Mn Oxide ◽  
Content Ratio ◽  
Incubation Experiments ◽  
Exchangeable Fraction

This work investigated the effects of soil pH and the content ratio of natural zeolite on Cr contaminated soil. The immobilization experiments of the exchangeable Cr in contaminated soils were conducted using the batch method. The incubation experiments were carried out over 30 days in plastic bottles to determine five fraction of Cr existence (exchangeable fraction (F1), Fe/Mn/Oxide (F2), carbonate bound (F3), organic matters (F4) and residual (F5)) in amended soils after incubation. Results showed that the content and proportion of the exchangeable Cr decreased with an increase in soil pH from 5 to 9. At soil pH 5, the exchangeable Cr in soil reduced from 44.80±0.772 mg/kg (initial soil) to 17.72±0.300 mg/kg after 30 days of incubation with natural Zeolite 3%. Meanwhile, the exchangeable Cr of soil also decreased with increasing the content ratio of natural zeolite from 1% to 5% in soil. The ratio of 3% was suitable for incubation of the exchangeable Cr in contaminated soil with natural zeolite. The exchangeable Cr in contaminated soil decreased from 80.34% at un-amended soil treatment to 25.06% after incubation of 30 days. The forms of carbonate bound (F3) and organic matters (F4) in amended soils increased to 36.54% and 28% compared with 4.26% and 6.90% in un-amended contaminated soil. Ion exchange, precipitation and adsorption on the surface of natural zeolite  might be the potential mechanisms of immobilization of the exchangeable Cr. The results indicated that natural zeolite can be used as the effective adsorbent for immobilizing the exchangeable Cr in contaminated soils and leading to a decrease in the environmental risk from Cr toxicity.

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 Immobilization of Lead from Pb-Contaminated Soil Amended with Peat Moss

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Seul-Ji Lee ◽  
Myoung-Eun Lee ◽  
Jae Woo Chung ◽  
Jin Hee Park ◽  
Keun Young Huh ◽  
...  
Keyword(s):  
Contaminated Soil ◽  
Extraction Method ◽  
Peat Moss ◽  
Leaching Test ◽  
Column Leaching ◽  
Pb Toxicity ◽  
Column Leaching Test ◽  
Leaching Experiment ◽  
Reduced Mobility ◽  
Pb Immobilization

Immobilization of lead (Pb) using soil amendments can reduce Pb toxicity and bioavailability in soil. This study evaluated Pb immobilization in a Pb-contaminated soil by using peat moss through various tests. The Pb-contaminated soil (2000 mg Pb·kg−1) was amended with 1%, 5%, and 10% of peat moss to immobilize Pb in the soil. The immobilization properties of Pb in the contaminated soil were evaluated by a column leaching experiment, a microcosm test, and a batch incubation test. Peat moss significantly reduced the Pb leaching in all of the experiments and more effectively reduced mobility and toxicity of Pb in the column leaching and microcosm tests than bioavailability in the batch incubation test. The immobilized lead from the soils amended with 1%, 5%, and 10% of peat moss was 37.9%, 87.1%, and 95.4% from the column leaching test, 18.5%, 90.9%, and 96.4% from the microcosm test, and 2.0%, 36.9%, and 57.9% from the NH4NO3extraction method, respectively, indicating that peat moss can be effectively used for the remediation of Pb-contaminated soil.

scholarly journals Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar

2020 ◽  
Vol 17 (3) ◽  
pp. 827
Author(s):  
Yi-min Wang ◽  
Shao-wei Wang ◽  
Cheng-qian Wang ◽  
Zhi-yuan Zhang ◽  
Jia-qi Zhang ◽  
...  
Keyword(s):  
Soil Ph ◽  
Contaminated Soil ◽  
Soil Nutrient ◽  
Water Soluble ◽  
Available Phosphorus ◽  
Corn Straw ◽  
Modified Biochar ◽  
Soil Available Phosphorus ◽  
Application Rates

Remediation of soil heavy metal by biochar has been extensively studied. However, few studies focused on the role of biochar on the co-immobilization of cadmium (Cd(II)) and arsenate (As(V)) and related soil nutrient availability. Remediation tests were conducted with three types of pristine and ferric trichloride (FeCl3) modified biochar (rice, wheat, and corn straw biochar) in Cd-As co-contaminated soil, with application rates of 1, 5, and 10% (w/w) and the incubation of 1, 7, 10, and 15 days. Using TCLP (Toxicity Characteristic Leaching Procedure) method, 10% of FeCl3 modified corn-straw derived biochar (FCB) had the highest immobilization efficiency of Cd(II) (63.21%) and As(V) (95.10%) after 10 days of the incubation. Iron-modified biochar immobilized higher fractions of water-soluble (F1) and surface-absorbed (F2) metal fractions than pristine biochar. For FCB amendment, Cd was mostly presented in the organic matter (OM) and sulfides associated (F4) and residual (F5) fractions (88.52%), as was found in the Fe-Al (oxides and hydroxides) (F3), F4, and F5 fractions (75.87%). FCB amendment increased soil pH values and available iron contents (p < 0.05), while no changes in soil available phosphorus content (p > 0.05). This study showed that FCB application reduces the environmental mobility of metals in Cd-As contaminated soil, while it also increases soil pH and available nutrient mobility, improving soil environmental quality and reducing remediation costs.

Chlorophenols Contaminated Soil Remediation by Peroxidation

2010 ◽  
Vol 13 (1) ◽  
Author(s):  
Anna Goi ◽  
Marina Trapido
Keyword(s):  
Hydrogen Peroxide ◽  
Soil Remediation ◽  
Soil Ph ◽  
Contaminated Soil ◽  
Effective Alternative ◽  
Natural Soil ◽  
Treatment Methods ◽  
Magnesium Peroxide ◽  
Calcium And Magnesium ◽  
Degradation In Soil

AbstractThe treatment with new peroxygen chemicals, such as calcium or magnesium peroxide and persulphate, was found to be effective for the chlorophenols contaminated soil remediation at natural soil pH. Contaminants in soil could be degraded with the addition of hydrogen peroxide or persulphate only indicating possible ability of natural catalysts presented in soil to activate the reaction of remedial chemicals decomposition. Chlorophenols could be also effectively (up to 80%) degraded, depending on the dosage, with the addition of calcium and magnesium peroxides. The combined strong remedies (hydrogen peroxide/persulphate) system was found to be an effective alternative for chlorophenols degradation in soil leading to a substantial organically bounded chlorine mineralization. The implementation of the treatment methods utilizing new chemicals of the peroxygen group was competitive with the treatment by hydrogen peroxide, resulting in a close or more effective degradation of chlorophenols in soil.

scholarly journals Study of the remediation effects of passivation materials on Pb-contaminated soil

2020 ◽  
Vol 18 (1) ◽  
pp. 911-917
Author(s):  
Shu-Xuan Liang ◽  
Xiao-Can Xi ◽  
Yu-Ru Li
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Soil Ph ◽  
Contaminated Soil ◽  
Blast Furnace Slag ◽  
Phosphate Fertilizer ◽  
Fertilizer Treatment ◽  
Phosphate Fertilizers ◽  
Treatment Groups ◽  
Furnace Slag

AbstractThe passivation effects of blast furnace slag, fly ash, corncob biochar, and phosphate fertilizer in Pb-contaminated soil was evaluated against the soil pH, available Pb content, Pb fractions, and bioactivity coefficient. Blast furnace slag and fly ash could increase soil pH, while corncob biochar and phosphate fertilizers lowered soil pH. The available Pb content in the blast furnace slag and phosphate fertilizer treatment groups was significantly lower than in other treatments. Also, blast furnace slag and phosphate fertilizer could significantly convert nonresidual Pb into residual Pb. Combined with the environmental impact after application and cost of the material, it is recommended that blast furnace slag can be used as a passivation agent for low-concentration Pb-contaminated soil.

scholarly journals MODELING SOIL PH FATE IN CRUDE OIL CONTAMINATED SOIL IN THE NIGER DELTA

2018 ◽  
Vol VI (XI) ◽  
Author(s):  
N. L. Nwakwasi ◽  
J. C. Osuagwu ◽  
B. U. Dike ◽  
H. U. Nwoke ◽  
J. C. Agunwamba
Keyword(s):  
Crude Oil ◽  
Soil Ph ◽  
Contaminated Soil ◽  
Niger Delta
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