Phytostabilization of Cd and Pb in Highly Polluted Farmland Soils Using Ramie and Amendments

In-situ remediation of heavy-metal-contaminated soil in farmland using phytostabilization combined with soil amendments is a low-cost and effective technology for soil pollution remediation. In this study, coconut shell biochar (CB, 0.1% and 0.5%), organic fertilizer (OF, 3.0%), and Fe-Si-Ca material (IS, 3.0%) were used to enhance the phytostabilization effect of ramie (Boehmeria nivea L.) on Cd and Pb in highly polluted soils collected at Dabaoshan (DB) and Yangshuo (YS) mine sites. Results showed that simultaneous application of CB, OF, and IS amendments (0.1% CB + 3.0% OF + 3.0% IS and 0.5% CB + 3.0% OF + 3.0% IS, DB-T5 and DB-T6) could significantly increase soil pH, reduce the concentrations of CaCl2-extractable Cd and Pb, and increase the contents of Ca, P, S, and Si in DB soil. Under these two treatments, the growth of ramie was significantly improved, its photosynthesis was enhanced, and its levels of Cd and Pb were reduced, in comparison with the control (DB-CK). After applying DB-T5 and DB-T6, the concentrations of Cd and Pb in roots were decreased by 97.7–100% and 64.6–77.9%, while in shoots they were decreased by up to 100% and 92.9–100%, respectively. In YS-T4 (0.5% CB + 3.0% OF), the concentrations of Cd and Pb in roots were decreased by 39.5% and 46.0%, and in shoots they were decreased by 44.7% and 88.3%. We posit that phytostabilization using ramie and amendments could reduce the Cd and Pb bioavailability in the soil mainly through rhizosphere immobilization and plant absorption. In summary, this study suggests that the use of tolerant plant ramie and simultaneous application of coconut shell biochar, organic fertilizer, and Fe-Si-Ca materials is an effective stabilization strategy that can reduce Cd and Pb availabilities in soil. Ultimately, this strategy may reduce the exposure risk of crops to heavy metal pollution in farmland.

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Heavy Metal Polluted Soils: Effect on Plants and Bioremediation Methods

Applied and Environmental Soil Science ◽

10.1155/2014/752708 ◽

2014 ◽

Vol 2014 ◽

pp. 1-12 ◽

Cited By ~ 291

Author(s):

G. U. Chibuike ◽

S. C. Obiora

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Growth Performance ◽

Anthropogenic Activities ◽

Polluted Soils

Soils polluted with heavy metals have become common across the globe due to increase in geologic and anthropogenic activities. Plants growing on these soils show a reduction in growth, performance, and yield. Bioremediation is an effective method of treating heavy metal polluted soils. It is a widely accepted method that is mostly carried outin situ; hence it is suitable for the establishment/reestablishment of crops on treated soils. Microorganisms and plants employ different mechanisms for the bioremediation of polluted soils. Using plants for the treatment of polluted soils is a more common approach in the bioremediation of heavy metal polluted soils. Combining both microorganisms and plants is an approach to bioremediation that ensures a more efficient clean-up of heavy metal polluted soils. However, success of this approach largely depends on the species of organisms involved in the process.

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Pertumbuhan, hasil, dan kandungan kromium kangkung darat akibat kombinasi macam dan dosis bahan organik pada media tanam tercemar

Kultivasi ◽

10.24198/kultivasi.v18i3.22464 ◽

2019 ◽

Vol 18 (3) ◽

Author(s):

Intan Nurcahya ◽

Noertjahyani Noertjahyani ◽

Hudaya Mulyana

Keyword(s):

Heavy Metal ◽

Block Design ◽

Organic Fertilizer ◽

Water System ◽

Growth Yield ◽

Dry Weight ◽

Growth And Yield ◽

Water Spinach ◽

Polluted Soils ◽

Randomized Block Design

Sari. Kangkung darat merupakan salah satu tanaman yang dapat menyerap logam berat. Hal ini berkaitan dengan pertumbuhan, hasil, dan keamanan kangkung sebagai bahan konsumsi. Pencemaran lahan pertanian dapat disebabkan dari kegiatan industri, salah satunya yaitu limbah penyamakan kulit yang mengandung logam berat kromium yang mengairi lahan pertanian. Pemberian bahan organik merupakan salah satu cara untuk meningkatkan hasil tanaman kangkung darat dan menyerap logam berat. Penelitian bertujuan untuk mengetahui pengaruh kombinasi macam dan dosis bahan organik pada media tercemar kromium penyamakan kulit terhadap pertumbuhan, hasil dan kandungan kromium pada tanaman kangkung darat. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan sembilan perlakuan dan tiga kali ulangan. Perlakuan kombinasi macam dan dosis bahan organik terdiri dari serasah daun, pupuk kandang kambing, dan kascing dengan dosis masing-masing 5 t ha-1, 10 t ha-1dan 15 t ha-1. Hasil penelitian menunjukkan bahwa perlakuan kombinasi macam dan dosis bahan organik pada media tercemar kromium penyamakan kulit berpengaruh nyata terhadap pertumbuhan, dan hasil tanaman kangkung darat. Kombinasi kascing 15 t ha-1 memberikan pengaruh yang lebih baik terhadap tinggi tanaman, bobot segar per tanaman, dan bobot kering per tanaman, sedangkan pemberian serasah daun 5 t ha-1 menghasilkan tanaman kangkung darat dengan kandungan kromium yang lebih rendah (51,33 mgkg-1) dibandingkan perlakuan lainnya tetapi tanaman dengan kadar tersebut belum aman untuk dikonsumsi.Kata Kunci : kangkung darat, bahan organik, kromium, hasilAbstract. Water spinach is a heavy metal accumulator plant if grown in polluted soils. This raises the concern of water spinach safety as one of the most consumed vegetables in Asian household. Land pollution in water spinach cultivation area can be caused by industrial activities that involve heavy metals such as tannery. Industrial waste such as chrome leaches to the water system that eventually will be used as irrigation source for agriculture. Organic fertilizer is a potential solution to increase water spinach growth, yield, and absorb heavy metal contaminants. This research evaluated the effect of type and dosage of organic fertilizer on water spinach that grown in chromium-polluted soils. This research design used Randomized Block Design (RBD) with nine treatments and three replication. The treatment of combination of types and dosages of organic fertilizer. There were dried leaves, goat manure, and vermicompost with dosage of 5 t ha-1, 10 t ha-1 and 15 t ha-1. The results of this research showed that the effect of combination of organic fertilizer type and dosages at chrome polluted media gave better effect on growth, and yield of water spinach. Giving vermicompost of 15 t ha-1 gaves better effect on plant height, fresh weight of plant, and dry weight of plant, meanwhile the doses of 5 t ha-1dried leaves showed the lowest chrome content compared to other treatments, but these plants are still unsafe for consumption due to high chrome content.Keywords: water spinach, organic fertilizer, chromium, yield

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Romanian bentonite and fly ash characterization and their use in heavy metal “in-situ” immobilization in polluted soils

E3S Web of Conferences ◽

10.1051/e3sconf/20171801022 ◽

2017 ◽

Vol 18 ◽

pp. 01022

Author(s):

Săndica Liliana Gherghe ◽

Ildiko Anger ◽

Georgiana Moise ◽

Roxana Trusca

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Fly Ash ◽

Contact Time ◽

In Situ Immobilization ◽

Polluted Soils ◽

Ft Ir ◽

Metallurgical Activities

This article presents the characterization of the Romanian bentonite and fly ash, using different techniques: FAAS, XRD, FT-IR, SEM and EDAX and their evaluation as sorbents for heavy metals immobilization in polluted soils coming from mining and metallurgical activities. The applicability of bentonite and fly ash for Pb (II) and Zn (II) immobilization was studied using aqueous solutions of these metals. The influence of the pH and contact time were studied. The results shown that the Romanian bentonite and fly ash could be used for Pb (II) and Zn (II) immobilization in polluted soils from brownfields.

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Romanian bentonite and fly ash characterization and their use in heavy metal “in-situ” immobilization in polluted soils

E3S Web of Conferences ◽

10.1051/e3sconf/201712301022 ◽

2017 ◽

Vol 18 ◽

pp. 01022

Author(s):

Săndica Liliana Gherghe ◽

Ildiko Anger ◽

Georgiana Moise ◽

Roxana Trusca

Keyword(s):

Heavy Metal ◽

Fly Ash ◽

In Situ Immobilization ◽

Polluted Soils

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Phytoremediation of Cadmium Contaminated Soils: Advances and Researching Prospects

Materials Science Forum ◽

10.4028/www.scientific.net/msf.743-744.732 ◽

2013 ◽

Vol 743-744 ◽

pp. 732-744 ◽

Cited By ~ 1

Author(s):

Hui Su ◽

Zhang Cai ◽

Qi Xing Zhou

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Soil Contamination ◽

Contaminated Soils ◽

Metal Contamination ◽

Heavy Metal Contamination ◽

Low Cost ◽

Organic Contamination ◽

Metal Organic

More and more attention has been paid to soil contamination by heavy metals in recent years. Heavy metal contamination includes heavy metal - heavy metal contamination, heavy metal - organic contamination, and heavy metal nutrient contamination. In particular, soil contamination by cadmium (Cd) is the most typical one. In terms of the current remediation technologies, phytoremediation of Cd contaminated soil remains popular due to its low cost, environmental aesthetics and in-situ effective treatment. Therefore, screening-out and identification of Cd hyperaccumulators becomes a hotspot in this researching domain. In order to further improve the efficiency of phytoremediation, we have developed a variety of joint remediation technologies. Based on these work at home and abroad, we summed up the studying progress in this field. Some main researching contents and directions of phytoremediation for Cd contaminated soils were also proposed.

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