Understanding nitrogen and carbon biogeotransformations and transport dynamics in saturated soil columns

Mekala, C.; Gaonkar, Omkar; Nambi, Indumathi M.

doi:10.1016/j.geoderma.2016.10.004

Cited by 11 publications

(4 citation statements)

References 50 publications

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“…This reduction in TN can be attributed to the change in nitrificationdenitrification synergy in accordance with the reduction in EC after flushing for one pore volume. [42,43] Further, both TOC and chloride curves began to decrease from the 35th minute, similar to the trend observed for nitrogen concentration. As reported earlier, the leaching trends of SOC can be influenced by both nitrogen species transformations and other environmental conditions.…”

Section: Nutrient Leaching Trends With Compost Amendmentssupporting

confidence: 74%

Improving Soil Fertility and Nutrient Dynamics with Leachate Attributes from Sewage Sludge by Impoundment and Co‐Composting

Balaganesh

Vasudevan

Natarajan³

et al. 2020

CLEAN Soil Air Water

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Co-composting offers a sustainable solution for community level sewage treatment plants (STP) by producing nutrient-optimized compost. Soils in such treatment vicinity are susceptible for receiving significant quantity of wastewater, capable of causing a radical shift in soil structure and nutrient dynamics. Samples of sludge-leachate impounded soil (SLIS) and low fertile soil are collected to select the proportioning of sludge-derived composts (SDC). A series of batch experiments are conducted by mixing predetermined quantity of SDC with field soils on weight basis to identify the best proportioning combination. Based on the in-vessel aerobic cocomposting experiments with reuse of generated leachate (at a rate of 1.0 per week), SDC exhibits good nutrient stability in terms of carbon-nitrogen ratio (8-11) with effective moisture augmentation from leachate (45%-74%) under non-isothermal conditions (between 46±2°C and 32±4°C) within 45 days of incubation. Significant nitrogen transformation is exhibited in SLIS samples due to the temporal variations in sludge decomposition as verified through leaching column experiments. Approximately 30% of nutrient (carbon and nitrogen) leaching is prevented due to the improved moisture retention capacity in presence of compost. An empirical correlation has been derived between various analytical measures of organic matter depicting enhanced decomposition stages of sludge in soil amendments.

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Section: Nutrient Leaching Trends With Compost Amendmentssupporting

confidence: 74%

Improving Soil Fertility and Nutrient Dynamics with Leachate Attributes from Sewage Sludge by Impoundment and Co‐Composting

Balaganesh

Vasudevan

Natarajan³

et al. 2020

CLEAN Soil Air Water

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“…Also, SDS being an anion, the adherence to soil is low which tend to leaches out of the soil column. The behaviour of SDS was similar to nitrate anion as reported in Mekala et al, 2017. The leaching mechanism is not incorporated in the model.…”

Section: E Transport Study Of Sorption Coupled Biodegradation Of Sdssupporting

confidence: 64%

Subsurface Based Contaminant Transport Modelling of SDS Nac12h25so4

jayaprakash,

Mekala,

Priyan

2020

IJEAT

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Subsurface contamination by emerging contaminants from inappropriate effluent discharge is one of the serious issues directly affecting the quality of groundwater. This study is aimed at transport and transformations of anionic surfactant (SDS). Sodium Dodecyl Sulfate [NaC12H25SO4 ] from grey wastewater containing detergents in unsaturated soils and its impacts on groundwater. HYDRUS-1D model to predict the transport mechanisms was developed. In this regard, surfactant concentrations for SDS from the sewage treatment plant of KCET, Virudhunagar was taken for evaluation. This research work reveals that inlet, outlet, sludge with ample quantities of SDS concentrations (13, 9.55 and 15.67 mg/L). Soil irrigated with sewage was taken as primary sample. Soil column experiments were conducted first with tracer to calculate the dispersion at a flow rate of 1 cm/h, estimated to be 3.1cm. A series of transport experiments were started with 10 mg/L of SDS to comprehend the sorption tied biodegradation. It was observed that leaching phenomenon was the dominant process when compared to biodegradation and sorption. An initial concentration of 13.44 mg/L was administered and found 12 mg/L at the outlet. Hence, 1.44 mg/L underwent sorption and biodegradation. The model estimated linear sorption parameter with first order degradation coefficient 0.131cc/g and 0.01/h. The calibrated HYDRUS model was adopted to study the various scenarios with GWT depth of 30 m. The simulated SDS concentration at GWT of 30m is 4.13mg/litre.

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“…In riparian groundwater adjacent to a farm in the New York state (USA), Anderson et al (2014) found that total groundwater denitrification was equivalent to 32% of manure N spread on the adjacent upland field. Mekala et al (2017) simulated the transport and dynamics of N in an agricultural soil under flooded conditions and concluded that relatively shallow aquifers with sandy soil are vulnerable to NO 3 − contamination at around 10 days if continuous irrigation is practiced. They also stated that NO 3 − had higher leaching potential than NH 4 + or DOC.…”

Section: Dynamics Of In and Ch 4 In Groundwater: The Influence Of Gromentioning

confidence: 99%

Importance of the vegetation-groundwater-stream continuum to understand transformation of biogenic carbon in aquatic systems – A case study based on a pine-maize comparison in a lowland sandy watershed (Landes de Gascogne, SW France)

Deirmendjian

Anschutz

Morel

et al. 2019

Science of The Total Environment

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During land-aquatic transfer, carbon (C) and inorganic nutrients (IN) are transformed in soils, groundwater, and at the groundwater-surface water interface as well as in stream channels and stream sediments. However, processes and factors controlling these transfers and transformations are not well constrained, particularly with respect to land use effect. We compared C and IN concentrations in shallow groundwater and first-order streams of a sandy lowland catchment dominated by two types of land use: pine forest and maize cropland. Contrary to forest groundwater, crop groundwater exhibited oxic conditions all-year round as a result of higher evapotranspiration and better lateral drainage that decreased the water table below the organic-rich soil horizon, prevented the leaching of soil-generated dissolved organic carbon (DOC) in groundwater, and thus limited consumption of dissolved oxygen (O 2). In crop groundwater, oxic conditions inhibited denitrification and methanogenesis resulting in high nitrate (NO 3 − ; on average

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Understanding nitrogen and carbon biogeotransformations and transport dynamics in saturated soil columns

Cited by 11 publications

References 50 publications

Improving Soil Fertility and Nutrient Dynamics with Leachate Attributes from Sewage Sludge by Impoundment and Co‐Composting

Improving Soil Fertility and Nutrient Dynamics with Leachate Attributes from Sewage Sludge by Impoundment and Co‐Composting

Subsurface Based Contaminant Transport Modelling of SDS Nac12h25so4

Importance of the vegetation-groundwater-stream continuum to understand transformation of biogenic carbon in aquatic systems – A case study based on a pine-maize comparison in a lowland sandy watershed (Landes de Gascogne, SW France)

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