A practical soil washing method for use in a Cd-contaminated paddy field, with simple on-site wastewater treatment

Geoderma ◽  
2016 ◽  
Vol 270 ◽  
pp. 3-9 ◽  
Author(s):  
Tomoyuki Makino ◽  
Yuji Maejima ◽  
Ikuko Akahane ◽  
Takashi Kamiya ◽  
Hiroyuki Takano ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Paddy Field ◽  
Soil Washing ◽  
Washing Method

scholarly journals Applicability of soil washing method for radionuclide-contaminated soils from road maintenance in Fukushima

2015 ◽  
Vol 10 (4) ◽  
pp. 489-502
Author(s):  
Osamu TAKAHATA ◽  
Shojirou KUMADA ◽  
Junya ANDO ◽  
Shinji MIYAGUCHI ◽  
Koji ISHIYAMA ◽  
...  
Keyword(s):  
Contaminated Soils ◽  
Soil Washing ◽  
Road Maintenance ◽  
Washing Method

Fungi from Canadian coniferous forest soils

1973 ◽  
Vol 51 (12) ◽  
pp. 2275-2290 ◽  
Author(s):  
P. Widden ◽  
D. Parkinson
Keyword(s):  
Forest Soils ◽  
Mineral Soil ◽  
Coniferous Forest ◽  
Soil Washing ◽  
Pinus Strobus ◽  
Fungal Mycelium ◽  
Penicillium Species ◽  
Fungus Flora ◽  
Alternaria Sp ◽  
Washing Method

The fungus flora from four pine forest soils was investigated. Qualitative studies used a soil-washing method, whereas quantitative investigations were performed using a direct observation technique. Results indicate that the fungus populations on litter and humus from all four forest soils are fairly similar, with Cladosporium herbarum, Aureobasidium pullulans, Alternaria sp., and various members of the order Sphaeropsidales being common in the litter, and Trichoderma and Penicillium species increasing in frequency in the F and H layers. The fungi isolated from the mineral soil horizons were more varied in nature, but certain genera seemed to be found frequently; these included Mortierella, Chrysosporium, Oidiodendron, Paecilomyces, Cylindrocarpon, Torulomyces, and sterile dark fungi.A detailed investigation of a Pinus strobus forest at St. Williams, Ontario, revealed no distinct seasonal patterns in the relative frequencies of the species of fungi.Quantitative studies showed that, in all soils, mycelial content decreased with depth from the humus. A comparison of the four sites showed a wide variation in fungal mycelium, varying from 30 m/g dry soil under Pinus strobus (in the A1 horizon) to 1540 m/g under P. contorta during May. Seasonal data from the P. strobus forest indicate a peak in mycelial content during August.

scholarly journals Distribution and characteristic of nitrite-dependent anaerobic methane oxidation bacteria in wastewater treatment plants and agriculture fields of northern China

2016 ◽  
Author(s):  
Zhen Hu ◽  
Ru Ma
Keyword(s):  
Wastewater Treatment ◽  
Methane Oxidation ◽  
Paddy Field ◽  
Wastewater Treatment Plants ◽  
Enrichment Culture ◽  
Treatment Plant ◽  
Northern China ◽  
Anaerobic Methane Oxidation ◽  
Corn Field ◽  
Geographical Regions

Nitrite-dependent anaerobic methane oxidation (n-damo) is a recently discovered biological process, which has been arousing global attention because of its potential in minimizing greenhouse gases emissions. In this study, molecular biological techniques and potential n-damo activity batch experiments were conducted to investigate the presence and diversity of M. oxyfera bacteria in paddy field, corn field, and wastewater treatment plant (WWTP) of northern China, as well as lab-scale n-damo enrichment culture. N-damo enrichment culture showed the highest abundance of M. oxyfera bacteria and positive correlation was observed between potential n-damo rate and abundance of M. oxyfera bacteria. Both paddy field and corn field were believed to be better inoculum than WWTP for the enrichment of M. oxyfera bacteria, due to their higher abundance and diversity of M. oxyfera bacteria. Comparative analysis revealed that long biomass retention time and optimum environment (low NH4+ and high NO2- content) were suitable for the growth of M. oxyfera bacteria. In addition, the distribution and diversity of M. oxyfera bacterial might be related to geographical regions.

Domestic wastewater treatment by a constructed wetland system planted with rice

2011 ◽  
Vol 64 (12) ◽  
pp. 2376-2380 ◽  
Author(s):  
Suwasa Kantawanichkul ◽  
Wanida Duangjaisak
Keyword(s):  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Constructed Wetland ◽  
Retention Time ◽  
Paddy Field ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Biological Oxygen Demand ◽  
Removal Efficiencies

The experiments were conducted in four concrete laboratory scale free water surface constructed wetland units 1 m wide, 1.5 m long and 0.8 m deep. Paddy field soil was added to a depth of 0.4 m and rice seedlings (Oryza sativa L.) were transplanted into the units at a density of 25 plants/m2. Domestic wastewater collected from Chiang Mai University was applied into each unit via two different modes to evaluate suitable conditions for wastewater treatment and rice yield. In the first experiment, the wastewater was fed intermittently (7 h/day) with a hydraulic loading rate of 2, 4, 6 and 8 cm/day. The maximum removal efficiencies for chemical oxygen demand, biological oxygen demand, total kjedahl nitrogen and suspended solids were only 49.1, 58.7, 64.0 and 59.4%, respectively, due to the short hydraulic retention time for the biodegradation of organic substances. In the second experiment, the wastewater in each unit was inundated to a depth of 15 cm for 10, 15, 20 and 25 days in each unit and then drained and re-flooded. Removal efficiencies of chemical oxygen demand, biological oxygen demand, total kjedahl nitrogen and suspended solids were greater than in the first experiment especially at the 25 day retention time and except for suspended solids met the Thai national effluent standard. The study revealed that apart from wastewater treatment, wastewater can replace natural water to grow rice in the dry season or throughout the year. Moreover, nutrients in wastewater can be a substitute for chemical fertilizers. Rice grain production was 4,700 kg/ha and only 6% less than the production from the conventional paddy field.

Characterizing the Photodegradation Ability of Pentachlorophenol in β-Cyclodextrin Soil Washing Solution

2015 ◽  
Vol 768 ◽  
pp. 155-163 ◽  
Author(s):  
Ze Yu Zhou ◽  
Hong Tao Wang ◽  
Wen Jing Lu
Keyword(s):  
Soil Remediation ◽  
Contaminated Soil ◽  
Degradation Rate ◽  
Soil Washing ◽  
Aeration Rate ◽  
Degradation Processes ◽  
Photodegradation Rate ◽  
Washing Method ◽  
Sun Light

The objective of this study was to characterize the photodegradation ability of pentachlorophenol (PCP) in β-cyclodextrin (β-CD) soil washing solution. After contaminated soil remediation by β-CD soil washing method, solution contained target contaminant was further treated with photodegradation technique. Degradation processes with Xe lamp to simulate natural sun light was investigated under different temperature, and various aeration rate. TiO2employed as photocatalyst was also tested in the soil washing system. The result demonstrated that photodegradation rate of PCP in soil washing solution was related to the aeration rate. The reaction could be slightly accelerated by increasing the temperature. TiO2adding will decrease the degradation speed, while using it together with H2O2will extremely increase the degradation rate of the target contaminant in this condition.

Scaling-up parameters for site restoration process using surfactant-enhanced soil washing coupled with wastewater treatment by Fenton and Fenton-like processes

2013 ◽  
Vol 34 (3) ◽  
pp. 363-371 ◽  
Author(s):  
Erick R. Bandala ◽  
Horacio Cossio ◽  
Adriana D. Sánchez-Lopez ◽  
Felipe Córdova ◽  
Juan M. Peralta-Herández ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Soil Washing ◽  
Scaling Up ◽  
Restoration Process ◽  
Site Restoration

scholarly journals Distribution and characteristic of nitrite-dependent anaerobic methane oxidation bacteria in wastewater treatment plants and agriculture fields of northern China

2016 ◽  
Author(s):  
Zhen Hu ◽  
Ru Ma
Keyword(s):  
Wastewater Treatment ◽  
Methane Oxidation ◽  
Paddy Field ◽  
Wastewater Treatment Plants ◽  
Enrichment Culture ◽  
Treatment Plant ◽  
Northern China ◽  
Anaerobic Methane Oxidation ◽  
Corn Field ◽  
Geographical Regions

Nitrite-dependent anaerobic methane oxidation (n-damo) is a recently discovered biological process, which has been arousing global attention because of its potential in minimizing greenhouse gases emissions. In this study, molecular biological techniques and potential n-damo activity batch experiments were conducted to investigate the presence and diversity of M. oxyfera bacteria in paddy field, corn field, and wastewater treatment plant (WWTP) of northern China, as well as lab-scale n-damo enrichment culture. N-damo enrichment culture showed the highest abundance of M. oxyfera bacteria and positive correlation was observed between potential n-damo rate and abundance of M. oxyfera bacteria. Both paddy field and corn field were believed to be better inoculum than WWTP for the enrichment of M. oxyfera bacteria, due to their higher abundance and diversity of M. oxyfera bacteria. Comparative analysis revealed that long biomass retention time and optimum environment (low NH4+ and high NO2- content) were suitable for the growth of M. oxyfera bacteria. In addition, the distribution and diversity of M. oxyfera bacterial might be related to geographical regions.

scholarly journals Distribution and characteristic of nitrite-dependent anaerobic methane oxidation bacteria by comparative analysis of wastewater treatment plants and agriculture fields in northern China

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2766 ◽  
Author(s):  
Zhen Hu ◽  
Ru Ma
Keyword(s):  
Wastewater Treatment ◽  
Comparative Analysis ◽  
Methane Oxidation ◽  
Paddy Field ◽  
Wastewater Treatment Plants ◽  
Enrichment Culture ◽  
Treatment Plant ◽  
Northern China ◽  
Anaerobic Methane Oxidation ◽  
Corn Field

Nitrite-dependent anaerobic methane oxidation (n-damo) is a recently discovered biological process which has been arousing global attention because of its potential in minimizing greenhouse gases emissions. In this study, molecular biological techniques and potential n-damo activity batch experiments were conducted to investigate the presence and diversity of M. oxyfera bacteria in paddy field, corn field, and wastewater treatment plant (WWTP) sites in northern China, as well as lab-scale n-damo enrichment culture. N-damo enrichment culture showed the highest abundance of M. oxyfera bacteria, and positive correlation was observed between potential n-damo rate and abundance of M. oxyfera bacteria. Both paddy field and corn field sites were believed to be better inoculum than WWTP for the enrichment of M. oxyfera bacteria due to their higher abundance and the diversity of M. oxyfera bacteria. Comparative analysis revealed that long biomass retention time, low NH${}_{4}^{+}$ and high NO${}_{2}^{-}$ content were suitable for the growth of M. oxyfera bacteria.

Ecological risk assessment of on-site soil washing with iron(III) chloride in cadmium-contaminated paddy field

2012 ◽  
Vol 80 ◽  
pp. 84-90 ◽  
Author(s):  
Takashi Nagai ◽  
Takeshi Horio ◽  
Atsushi Yokoyama ◽  
Takashi Kamiya ◽  
Hiroyuki Takano ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Paddy Field ◽  
Soil Washing
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