Wastewater C:N ratio effects on soil hydraulic conductivity and potential mechanisms for recovery

Magesan, G. N.; Williamson, J.C.; Yeates, G. W.; Lloyd-Jones, A. R.

doi:10.1016/s0960-8524(99)00054-1

Cited by 90 publications

(44 citation statements)

References 26 publications

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“…After solubilization, the EPS were flushed out with wastewater which substantially weakened the viscosity and the frictional resistance at the solid-liquid interface, thereby improving filtration rate. In addition, there was a significant negative correlation between EPS in the effluent and the filtration rate (R 2 = À0.990, P < 0.001), which is similar to the results of Magesan et al (2000) who found that the filter system could maintain hydraulic conductivity by reducing EPS accumulation (Magesan et al, 2000). It was hypothesized that solubilization treatment with RL works on the recovery and improvement of porosity and filtration rate thereby enhancing the purification efficiency of CWs.…”

Section: Effect Of Solubilization Treatment In Laboratory-scale Constsupporting

confidence: 82%

EPS solubilization treatment by applying the biosurfactant rhamnolipid to reduce clogging in constructed wetlands

Trinh

et al. 2016

Bioresource Technology

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Section: Effect Of Solubilization Treatment In Laboratory-scale Constsupporting

confidence: 82%

EPS solubilization treatment by applying the biosurfactant rhamnolipid to reduce clogging in constructed wetlands

Trinh

et al. 2016

Bioresource Technology

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“…It has been noted that the organic carbon present in recycled water can stimulate the activity of the soil microorganisms (Ramirez-Fuentes et al 2002). Magesan et al (2000) noted that the organic and inorganic nutrients in treated effluent that had a high carbon to nitrogen ratio stimulated the soil microorganisms which, in turn, decreased the hydraulic conductivity of the irrigated soil. The microorganisms in this study reduced the hydraulic conductivity in the soil by excess cell growth and the production of biofilm structures, both of which would have clogged up the pore spaces between the soil particles.…”

Section: Nutrientsmentioning

confidence: 99%

“…As discussed above, salinisation of soil through the application of irrigation water will high salinity and the subsequent effect on clay in the soil is one mechanism that reduces the hydraulic conductivity. Other wastewater characteristics that have been identified to reduce hydraulic conductivity include the present of suspended solids (Magesan et al 2000), nutrients which cause excess growth of microorganisms in the soil (Magesan et al 1999) or interaction of dissolved organic matter with the soil profile (Tarchitzky et al 1999).…”

Section: Salinitymentioning

confidence: 99%

Reuse of effluent water—benefits and risks

Toze

2006

Agricultural Water Management

571

285

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There is an increasing trend to require more efficient use of water resources, both in urban and rural environments. A major mechanism that can be used to achieve greater efficiencies is the reuse of water that once would have been discarded into the environment after use. The reuse of water for agricultural irrigation is often viewed as a positive means of recycling water due to the potential large volumes of water that can be used. Recycled water can have the advantage of being a constant, reliable water source and reduces the amount of water extracted from the environment. In addition, in some cases treatment requirements may be need to be less than for water used in an urban environment due to less potential human contact. There are concerns and unknowns, however, about the impact of the quality of the recycled water, both on the crop itself and on the end users of the crops. Water quality issues that can create real or perceived problems in agriculture include nutrient and sodium concentrations, heavy metals, and the presence of contaminants such as human and animal pathogens, pharmaceuticals and endocrine disruptors. Social attitudes to the use of crops that have been irrigated with recycled waters and the resulting impact on market value of crops are also a major consideration. This paper will discuss the benefits from using different types of recycled water and outline the current knowledge and opinions relating to risks such as water quality issues. KeywordsWastewater, recycling, soil, contaminants, pathogens, irrigation IntroductionIncreasing efficiencies in crop management and the continuing increases in crop yields has increased demands on water resources for irrigation purposes. Effluents are reused for irrigation purposes in many countries around the world on all of the populated continents (USEPA 1992). A number of these countries have developed guidelines that give quality criteria and advice on how effluents should reused for irrigation purposes. Examples of these guidelines are summarised in the USEPA guidelines for water reuse manual (USEPA 1992).

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“…This was explained by biological and physical pore clogging (Magesan et al, 1999;Magesan et al, 2000;Vinten et al, 1983;Viviani and Iovino, 2004) or by high ESP induced soil swelling and dispersion effects (Gharaibeh et al, 2007). In laboratory soil column studies, Levy et al (1999) applied 5 different TWW qualities to 3 different Israeli soils, finding that the poorest TWW quality reduced HC most.…”

Section: Introductionmentioning

confidence: 99%

Treated wastewater irrigation effects on soil hydraulic conductivity and aggregate stability of loamy soils in Israel

Schacht

Marschner

2015

Journal of Hydrology and Hydromechanics

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Abstract:The use of treated wastewater (TWW) for agricultural irrigation becomes increasingly important in water stressed regions like the Middle East for substituting fresh water (FW) resources. Due to elevated salt concentrations and organic compounds in TWW this practice has potential adverse effects on soil quality, such as the reduction of hydraulic conductivity (HC) and soil aggregate stability (SAS). To assess the impact of TWW irrigation in comparison to FW irrigation on HC, in-situ infiltration measurements using mini disk infiltrometer were deployed in four different long-term experimental orchard test sites in Israel. Topsoil samples (0-10 cm) were collected for analyzing SAS and determination of selected soil chemical and physical characteristics.The mean HC values decreased at all TWW sites by 42.9% up to 50.8% compared to FW sites. The SAS was 11.3% to 32.4% lower at all TWW sites. Soil electrical conductivity (EC) and exchangeable sodium percentage (ESP) were generally higher at TWW sites. These results indicate the use of TWW for irrigation is a viable, but potentially deleterious option, as it influences soil physical and chemical properties.

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Wastewater C:N ratio effects on soil hydraulic conductivity and potential mechanisms for recovery

Cited by 90 publications

References 26 publications

EPS solubilization treatment by applying the biosurfactant rhamnolipid to reduce clogging in constructed wetlands

EPS solubilization treatment by applying the biosurfactant rhamnolipid to reduce clogging in constructed wetlands

Reuse of effluent water—benefits and risks

Treated wastewater irrigation effects on soil hydraulic conductivity and aggregate stability of loamy soils in Israel

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