Recovery of nutrients from wastewater by a MgCl2 modified zeolite and their reuse as an amendment for Cu and Pb immobilization in soil

RSC Advances ◽  
2016 ◽  
Vol 6 (61) ◽  
pp. 55809-55818 ◽  
Author(s):  
Hao Wang ◽  
Xuejiang Wang ◽  
Jie Chen ◽  
Peng Xia ◽  
Jianfu Zhao
Keyword(s):  
Contaminated Soil ◽  
Recovery Process ◽  
Nutrient Recovery ◽  
Modified Zeolite ◽  
Soil P ◽  
Lead Immobilization ◽  
Pb Immobilization

In this study, nutrients in wastewater were simultaneously removed by magnesium modified zeolite, and the precipitates of the nutrient recovery process were applied as a kind of amendment to achieve copper and lead immobilization in contaminated soil.

scholarly journals Role of Inorganic and Organic Fractions in Animal Manure Compost in Lead Immobilization and Microbial Activity in Soil

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Masahiko Katoh ◽  
Wataru Kitahara ◽  
Takeshi Sato
Keyword(s):  
Microbial Activity ◽  
Contaminated Soil ◽  
Animal Manure ◽  
Water Soluble ◽  
Residual Fraction ◽  
Inorganic Component ◽  
Manure Compost ◽  
Microbial Enzyme ◽  
Lead Immobilization ◽  
Inorganic Fraction

This study aimed to identify how the ratio of inorganic-to-organic components in animal manure compost (AMC) affected both lead immobilization and microbial activity in lead-contaminated soil. When AMC containing 50% or more inorganic fraction with high phosphorous content was applied to contaminated soil, the amounts of water-soluble lead in it were suppressed by over 88% from the values in the soil without compost. The residual fraction under sequential extraction increased with the inorganic fraction in the AMC; however, in those AMCs, the levels of microbial enzyme activity were the same or less than those in the control soil. The application of AMC containing 25% inorganic fraction could alter the lead phases to be more insoluble while improving microbial enzyme activities; however, no suppression of the level of water-soluble lead existed during the first 30 days. These results indicate that compost containing an inorganic component of 50% or more with high phosphorus content is suitable for immobilizing lead; however, in the case where low precipitation is expected for a month, AMC containing 25% inorganic component could be used to both immobilize lead and restore microbial activity.

scholarly journals Bioremediation of cadmium-contaminated paddy soil using an autotrophic and heterotrophic mixture

RSC Advances ◽  
2020 ◽  
Vol 10 (44) ◽  
pp. 26090-26101
Author(s):  
Menglong Xu ◽  
Yazi Liu ◽  
Yan Deng ◽  
Siyuan Zhang ◽  
Xiaodong Hao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Contaminated Soil ◽  
Paddy Soil ◽  
Contaminated Soils ◽  
Short Term ◽  
Remediation Technology ◽  
Soil P ◽  
Contaminated Paddy Soil

Bioremediation can be a promising and effective remediation technology for treating Cd contaminated soils. Cooperative bioremediation using heterotrophic and autotrophic mixtures proved to be an efficient, short-term bioremediation strategy for heavy metal contaminated soil.

scholarly journals Duckweed from a Biorefinery System: Nutrient Recovery Efficiency and Forage Value

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5261
Author(s):  
Marcin Sońta ◽  
Andrzej Łozicki ◽  
Magdalena Szymańska ◽  
Tomasz Sosulski ◽  
Ewa Szara ◽  
...  
Keyword(s):  
Growth Medium ◽  
Nutritional Value ◽  
Liquid Fraction ◽  
Recovery Process ◽  
Nutrient Recovery ◽  
Growth Media ◽  
Fresh Matter ◽  
The Media ◽  
Forage Value ◽  
Interdisciplinary Study

This paper presents the results of an interdisciplinary study aimed at assessing the possibility of using duckweed to purify and recover nutrients from the effluent remaining after struvite precipitation and ammonia stripping from a liquid fraction of anaerobic digestate in a biorefinery located at a Dutch dairy cattle production farm. The nutritional value of duckweed obtained in a biorefinery was assessed as well. Duckweed (Lemna minuta) was cultured on a growth medium with various concentrations of effluent from a biorefinery (EFL) and digested slurry (DS) not subjected to the nutrient recovery process. The study’s results showed that duckweed culture on the media with high contents of DS or EFL was impossible because they both inhibited its growth. After 15 days of culture, the highest duckweed yield was obtained from the ponds with DS or EFL contents in the medium reaching 0.39% (37.8 g fresh matter (FM) and 16.8 g FM per 8500 mL of the growth medium, respectively). The recovery of N by duckweed was approximately 75% and 81%, whereas that of P was approximately 45% and 55% of the growth media with EFL0.39% and DS0.39%, respectively. Duckweed obtained from the biorefinery proved to be a valuable high-protein feedstuff with high contents of α-tocopherol and carotenoids. With a protein content in duckweed approximating 35.4–36.1%, it is possible to obtain 2–4 t of protein per 1 ha from EFL0.39% and DS0.39% ponds, respectively.

scholarly journals Describing the toxicity and sources and the remediation technologies for mercury-contaminated soil

RSC Advances ◽  
2020 ◽  
Vol 10 (39) ◽  
pp. 23221-23232 ◽  
Author(s):  
Dongye Teng ◽  
Kang Mao ◽  
Waqar Ali ◽  
Guomin Xu ◽  
Guopei Huang ◽  
...  
Keyword(s):  
Contaminated Soil ◽  
Soil P ◽  
Natural Element ◽  
Inorganic And Organic

Mercury (Hg) is a natural element and its compounds are found as inorganic and organic forms in the environment.

scholarly journals Application of polyethylenimine-coated magnetic nanocomposites for the selective separation of Cs-enriched clay particles from radioactive soil

RSC Advances ◽  
2020 ◽  
Vol 10 (37) ◽  
pp. 21822-21829
Author(s):  
June-Hyun Kim ◽  
Sung-Man Kim ◽  
In-Ho Yoon ◽  
Ilgook Kim
Keyword(s):  
Contaminated Soil ◽  
Fine Particles ◽  
Selective Separation ◽  
Magnetic Nanocomposites ◽  
Clay Particles ◽  
Soil P

Selective separation of Cs-enriched fine particles from contaminated soil using Fe3O4-PEI nanocomposites and a mesh filter.

scholarly journals Use of Soil Enzymes as Indicators for Contaminated Soil Monitoring and Sustainable Management

2020 ◽  
Vol 12 (19) ◽  
pp. 8209
Author(s):  
Sang-Hwan Lee ◽  
Min-Suk Kim ◽  
Jeong-Gyu Kim ◽  
Soon-Oh Kim
Keyword(s):  
Soil Pollution ◽  
Soil Quality ◽  
Soil Remediation ◽  
Functional Recovery ◽  
Contaminated Soil ◽  
Soil Enzymes ◽  
Chemical Properties ◽  
Recovery Process ◽  
Recovery Processes ◽  
Physico Chemical

Diagnosis of the risk of soil pollution and the performance of measures for the recovery of contaminated soil requires proper monitoring of the extent of soil function damage and its recovery process. Soil enzymes reveal ecosystem perturbations, are sensitive to management choices, and have been used as indicators of biogeochemical cycles, organic matter degradation, and soil remediation processes. Thus, enzymes can indicate, along with other physical or chemical properties, soil quality. In this paper, we review the effects of soil pollutants [toxic trace elements (TTE), and petroleum hydrocarbons (PHC)] on enzymatic activities and evaluate the usefulness of soil enzyme’s activity for monitoring recovery processes in contaminated soil. Soil enzymes can be said to be a powerful means of monitoring to properly indicate the degree of deterioration of soil quality caused by soil pollution and to diagnose the process of functional recovery of contaminated soil. Further research is needed to establish the quantitative relationships between the soil physico-chemical properties and enzyme activity and the effect of soil remediation on the functional recovery of soil-related to soil quality.

scholarly journals Evaluation of dissipation mechanisms for pyrene by maize (Zea Mays L.) in cadmium co-contaminated soil

2013 ◽  
Vol 11 (4) ◽  
pp. 487-496
Keyword(s):  
Zea Mays ◽  
Contaminated Soil ◽  
Growth Response ◽  
Zea Mays L ◽  
Plant Root ◽  
Complex Problem ◽  
Soil P ◽  
Metal Pollutants ◽  
Rhizosphere Microorganisms ◽  
Unplanted Soil

Sites co-contaminated with organic and metal pollutants are common and considered to be a more complex problem, as the two components often have a synergistic effect on cytotoxicity. This study investigated the dissipation mechnisms for pyrene in cadmium co-contaminated soil in which maize (ZEA MAYS L.) was grown in a greenhouse experiment. Results showed the growth response of maize may be affected by the co-contamination due to the interaction between the heavy metal and organic pollutants. Pyrene in both planted and unplanted soil diminished significantly at the end of 60-day culture, accounting for 21-31% of the initial extractable concentration in unplanted soil and 12-27% in planted soil, which indicated that the dissipation of pyrene was enhanced by the presence of vegetation. Although the presence of cadmium stimulated the accumulation of pyrene in roots and shoots of maize, contributions of plant off-take of pyrene to the total remediation enhancement in the presence of vegetation was less than 0.3%. A significant positive correlation was observed between soil enzyme activities (dehydrogenase, polyphenol oxidase) and the removal ratio of pyrene. Plant root exudates appear to promote the number of rhizosphere microorganisms and enzyme activity, thereby improving biodegradation of pyrene.

scholarly journals Phytoremediation effect of Medicago sativa colonized by Piriformospora indica in the phenanthrene and cadmium co-contaminated soil

2020 ◽  
Author(s):  
Liang Li ◽  
Pengyue Zhu ◽  
Xiaoyang Wang ◽  
Zhenhua Zhang
Keyword(s):  
Heavy Metals ◽  
Medicago Sativa ◽  
Contaminated Soil ◽  
Cadmium Accumulation ◽  
Piriformospora Indica ◽  
Soil P ◽  
Psii Photochemistry ◽  
Cadmium Contaminated Soil ◽  
Quantum Efficiency Of Psii

Abstract Background: Coexistence of polycylic aromatic hydrocarbons (PAHs) and heavy metals deleteriously threatens the quality of environmental health . Few reports uncover the mechanism of inoculation plants with Piriformospora indica for remediating PAH- m etal co-contaminated soil by analyzing the chemical speciations of contaminants . This study investigated the influence of inoculation Medicago sativa with P. indica to remediate phenanthrene (kind of PAHs ) , and cadmium (one of heavy metals ) co-contaminated soil by analyzing the plant growth, physiological parameters and chemical speciation in rhizosphere and non-rhizosphere . Results: T he presence of P. indica significantly increased plants tolerance, Chlorophyll a , Chlorophyll b , maximum quantum efficiency of PSII photochemistry and electron transport rate values in phenanthrene an d /or cadmium contaminated soil. P. indica inoculation in M edicago sativa root increased f luorescein diacetate activities in phenanthrene, cadmium and both of that co-contaminated soil, especially in non-rhizosphere . The presence of phenanthrene hindered the inoculated plant from accumulating cadmium to some extent ; Whereas the presence of cadmium did not hinder the degradation of phenanthrene in both rhizosphere and non-rhizosphere after P. indica colonization. Although the poor bioavailability of cadmium in rhizosphere restricted the transportation into stem, P. indica colonization in plant efficiently increased cadmium accumulation in root in cadmium and phenanthrene co-contaminated soil. Conclusions: In conclusion, t he work provides the theoretical basis that Piriformospora indica combined with Medicago sativa contributed to the remediation of PAH-Metal co-contaminated soil.

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