Effect of detergents from laundry greywater on soil properties: a preliminary study

Mohamed, Radin Maya Saphira Radin; Noramira, J.; Chan, Chee‐Ming; Hashim, M. K. Amir; Sabariah, M

doi:10.1007/s13201-018-0664-3

Cited by 38 publications

(19 citation statements)

References 15 publications

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“…This finding is consistent with many studies that soil pH tend to increase with the reduction in soil salinity (Wang et al 2012;Li et al 2015). The increase in soil pH may be due to that the part of adsorbed Na in soil colloids dissociates with the soil desalinization, and consequently produces OH − , which enhances the pH of the soil solution (Mohamed et al 2018). This indicated that alkalization occurred in the soils of the raised bed as salt was leached by rainfall.…”

Section: Discussionsupporting

confidence: 91%

Effects of continuous application flue-gas desulfurization gypsum and brackish ice on soil chemical properties and maize growth in a saline soil in coastal area of China

Tao

et al. 2018

Soil Science and Plant Nutrition

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The reclamation potential of applying combined brackish ice and flue-gas desulfurization (FGD) gypsum to a coastal saline soil was evaluated in a raised bed agroecosystem. Experimental plots in the raised bed were exposed to the following six treatments: 0, 4,000, and 8,000 m 3 ha −1 brackish ice mulch with and without FGD-gypsum. Although FGD-gypsum incorporation still increased the electrical conductivity of a saturated soil paste extract (EC e ) in the 0-20 cm soil layer after brackish ice melted in the second year (April 2013), they had not increased soil EC e at harvest especially in the second year. FGD-gypsum incorporation reduced soil pH not only after brackish ice melted in the second year but also at harvest in the first and second years. At harvest in the second year, FGD-gypsum incorporation significantly decreased soil Na adsorption ration (SAR) of the 0-20 cm layer with different volumes of brackish ice compared with the treatments without FGD-gypsum. The incorporation of FGD-gypsum increased the root dry weight per plant compared with the treatment without FGD-gypsum after harvest in the first year. The incorporation of FGD-gypsum increased organic matter in the 0-20 cm soil layer in the raised bed after harvest only in the first year. The application of brackish ice increased the emergence rate of maize in spring. Soil pH in all treatments tended to increase as time increased in the 0-20 and 20-40 cm soil layers in the raised bed. The results of the present study suggest that brackish ice and FGD-gypsum application further improve soil properties and crop growth, which might accelerate the reclamation process of the coastal saline land. ARTICLE HISTORY

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Section: Discussionsupporting

confidence: 91%

Effects of continuous application flue-gas desulfurization gypsum and brackish ice on soil chemical properties and maize growth in a saline soil in coastal area of China

Tao

et al. 2018

Soil Science and Plant Nutrition

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“…The CEC value at each varying depth for GCS at Ibadan increased relative to CEC value of CS. This is in agreement with similar increase in CEC for surfactant-rich soil obtained by Mohamed et al (2018a) and Siggins et al (2016). For Isolu samples, the CEC value of Isolu GCS increased over that of CS only at 0.5 m depth.…”

Section: Physico-chemical and Hydraulic Propertiessupporting

confidence: 90%

“…The pH of GCS at Ibadan increased for each sampling depth when compared with control pH value but only increased at 0.5 m depth for GCS at Isolu. The increase in soil pH for GCS at Ibadan agrees with results of Mohamed et al (2018a), Siggins et al (2016) and Shifa and Thomas (2017) that reported increase in pH of soil contaminated with laundry detergent. The decrease in soil pH of Isolu GCS relative to control pH value at 1.0 and 1.5 m is in line with decreased soil pH in soil irrigated with greywater reported by Mohamed et al (2013).…”

Section: Physico-chemical and Hydraulic Propertiessupporting

confidence: 89%

“…There is a growing concern in many countries, including Nigeria, on the disposal of greywater into soil drainage. The practice constitutes health hazard to aquatic ecology and the transmission of pathogens from polluted water to human food chain (Mohamed et al 2018a). This may not be unconnected to the distribution of pollutants such as chemical agents, surfactants and pathogens that drain into surface waters.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of geotechnical and physico-chemical properties of age-long greywater-contaminated soils in basement complex areas, southwest Nigeria

2020

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Bathroom-rich greywater coming directly in contact with virgin soil for years contaminates soil and alters its properties. The degree of alteration of soil properties may also depend on geological settings from which the soil was formed. The present study was designed to investigate the physico-chemical and geotechnical properties of greywater-contaminated soil (GCS) in different soils of basement complex formation. Soil samples were collected from greywater discharge zones and control soil (CS) in two locations (Mapo in Ibadan, Oyo State and Isolu in Abeokuta, Ogun State, Nigeria) at the depths of 0.5, 1.0 and 1.5 m from the surface, and the soil properties were analysed following standard procedures in the laboratory. The experiment consists of two modes: CS with no presence of greywater and GCS. The results of this study showed that alteration of most analysed properties depends greatly on sampling depth. There is increased in soil pH, cation exchange capacity, dry density (DD), saturated hydraulic conductivity (K sat) and shear strength (SS) in GCS at Mapo over their control values, while porosity, Atterberg limits (ALs), plasticity index and moisture content (MC) were reduced relative to the CS at all sampling depths. However, only bearing ratio improved at each sampling depth in GCS at Isolu, while alterations in other analysed properties did not follow clear trend. Correlation coefficient showed positive correlation between % clay and AL, porosity and ALs; MC and ALs at 1% level, while negative correlation exists between DD and ALs, % sand and ALs as well as K sat and ALs at the two locations. Two-way ANOVA showed that there is a significant difference at 5% level (p < 0.05) based on sampling depths for most analysed properties except SS, organic matter and soil resistivity. Further investigation is needed to study the trend of alteration of soil properties with depth on GCS at other soil types and geological formations.

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“…However, after DOM and HLS were diluted to concentrations of 5 g L −1 , they had lower electrical conductivity (20 mS cm −1 , on average) than SHS, which meant that SHS had a greater effect on soil salinity than DOM or HLS. Too high concentration of sodium in soil might increase the possibility of its toxicity to plants and it might cause soil aggregates to crumple and spread which leads to poor water retention (Mohamed et al 2018).…”

Section: Washing Agent Characteristicsmentioning

confidence: 99%

Washing agents from sewage sludge: efficiency of Cd removal from highly contaminated soils and effect on soil organic balance

et al. 2019

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Purpose To compare Cd removal from different soils with three washing agents recovered from sewage sludge (dissolved organic matter (DOM), soluble humic-like substances (HLS), soluble humic substances (SHS)). Also, to investigate how washing with these agents changes soil organic-matter composition (OM). Materials and methods Sandy clay loam (S1) and clay (S2) highly contaminated with Cd (300 mg kg −1) were washed with DOM, HLS, or SHS solutions at various pHs, and with various washing times and washing modes (single or double). Cd distribution and OM composition were determined (including content of humic substances (HS), fulvic fraction (FF), labile humic acids (L-HA), and stable humic acids (S-HA)). Results and discussion Cd removal proceeded with pseudo-second-order kinetics. Equilibrium was reached in 30 min (S1) and 60 min (S2). DOM, HLS, and SHS removed 75-82% of Cd from S1, and 80-87% from S2. The most mobile fraction of Cd was removed after one wash. S2 retained more OM, including HS, than S1. Although washing did not change the HA/FF ratio in most variants, washing with DOM and HLS increased the percentage of L-HA in both soils. Washing with SHS increased S-HA content in both soils, but the percent content of S-HA was similar to that in the unwashed soil. Conclusions DOM, HLS, and SHS derived from sewage sludge can effectively remediate clay and sandy clay soils highly contaminated with Cd. Washing with an SHS solution can increase the content of the most stable carbon forms (HA), which is beneficial for carbon sequestration in remediated soils.

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Effect of detergents from laundry greywater on soil properties: a preliminary study

Cited by 38 publications

References 15 publications

Effects of continuous application flue-gas desulfurization gypsum and brackish ice on soil chemical properties and maize growth in a saline soil in coastal area of China

Effects of continuous application flue-gas desulfurization gypsum and brackish ice on soil chemical properties and maize growth in a saline soil in coastal area of China

Assessment of geotechnical and physico-chemical properties of age-long greywater-contaminated soils in basement complex areas, southwest Nigeria

Washing agents from sewage sludge: efficiency of Cd removal from highly contaminated soils and effect on soil organic balance

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