Wastewater tertiary treatment options to match reuse standards in agriculture

Licciardello, Feliciana; Milani, Mirco; Consoli, Simona; Pappalardo, Nello; Barbagallo, S.; Cirelli, Giuseppe Luigi

doi:10.1016/j.agwat.2018.08.001

Cited by 61 publications

(27 citation statements)

References 26 publications

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“…Sedimentation took place in the storage pond and algae species grew, adding a new biological process. The storage pond has been recommended by the World Health Organization because this biological process is effective in removing microbial such as nematode eggs and helminth eggs [29].…”

Section: Storage Pondmentioning

confidence: 99%

Efficiency of an Integrated Purification System for Pig Slurry Treatment under Mediterranean Climate

et al. 2020

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The intensification of pig production is considered a risky activity for the environment when the generated pig slurry is not adequately treated. In addition, intensive agriculture practices where pig slurry is applied to the cropland could cause nitrate leaching, salinization, and soil pollution (heavy metals and pathogens), thus the development of an eco-friendly system for pig slurry treatment is essential to avoid undesirable environmental impacts. The main objective of this study was to assess the efficiency of an integrated purification system (IPS) for treating pig slurry. The system included a pretreatment module (raw pig slurry tank, phase separator, aeration tank, and settlement tank), constructed wetlands (CWs) that included an unplanted cell and a planted cell, and a storage pond (SP). Pig slurry samples from the pretreatment modules, CWs, and SP were collected in triplicate and physic-chemical and microbial analyses were performed. Results showed that the pretreatment modules decreased the total suspended solids (TSS), total nitrogen (TN), and total phosphorus (TP) concentrations in the liquid fraction. Higher total nitrogen removal was reported in the planted cell, which decreased from 4.0 g L−1 to 1.9 g L−1 in the inflow and outflow, respectively. Total efficiencies over 85% were found in the planted and unplanted cells for TSS, Kjeldahl nitrogen (KN), chemical oxygen demand (COD), and TP. Microbial parameters were eliminated after the treatment in the planted cell. Therefore, the results indicated that filtration (pretreatment), purification (constructed wetland), and bioremediation (storage pond) constituted an appropriate IPS for treating pig slurry.

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Section: Storage Pondmentioning

confidence: 99%

Efficiency of an Integrated Purification System for Pig Slurry Treatment under Mediterranean Climate

et al. 2020

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“…To enhance TW quality characteristics, efficient cost/benefit solutions should be provided by improving the disinfection phase in existing treatment processes or introducing new eco-sustainable treatments, like natural systems. Some authors [28] found that the percentage of samples below the Italian threshold of 50 CFU 100 mL −1 , raised up to 67% and 80% by using two WW treatment options with different equipment after the constructed wetland system, the first, a natural-based solution, including a biological pond, a storage reservoir and sand and disk filters and the second, including an ultraviolet system besides sand and disk filters. Both options ETTS allowed to match WHO guidelines (2006) for the "unrestricted irrigation" scenario, as well as the B quality class as defined in the proposed European Directive on water reuse [9].…”

Section: Results Of the Risk Assessment Analysis For Selected Wwtps Imentioning

confidence: 99%

How to Overcome Barriers for Wastewater Agricultural Reuse in Sicily (Italy)?

Ventura

Consoli

Barbagallo

et al. 2019

Water

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This study reports an up-to-date summary of the principal barriers still limiting reclaimed water use for agriculture in Italy, and particularly in Sicily. Moreover, it provides a geographic informative system (GIS)-based procedure for evaluating the potential treated wastewater (TW) reuse in the Sicilian region as a decision support system for its management. The survey, based on possible economic, morphologic, and design solutions, evidenced a feasible integration of several wastewater treatment plants (WWTPs) with irrigation areas, allowing the water availability enhancement. Overall, the potential volume of TW by WWTPs (connected to irrigation districts) is 163 × 106 m3 year−1, while the water deficit is 66 × 106 m3 year−1. The feasibility of TW reuse in Sicily was also analysed at the light of the World Health Organization microbial risk assessment. Escherichia coli (E. coli) analyses mostly accomplished these guidelines while conflicting with the restrictive Italian standards. Despite several limiting factors (restrictive legislations, high distance and unfavourable slope between WWTPs and irrigable areas, high monitoring and distribution costs) still hamper the exploitation of reclaimed water use in Sicilian agriculture, some solutions were identified to implement this practice.

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“…Research efforts are actually focusing on the development of cheaper and more efficient tertiary treatment technologies. 12,13 Among those, the adsorption/filtration process is one of the most promising technologies to meet those purposes. 14 The process uses materials with highspecific surface area and surface functional groups to capture contaminants.…”

Section: Introductionmentioning

confidence: 99%

Phosphorylated cellulose/electrospun chitosan nanofibers media for removal of heavy metals from aqueous solutions

Brandès

Brouillette

Chabot

2020

J of Applied Polymer Sci

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Contamination of water resources by toxic heavy metals has significant impacts on environmental and human health. Their removal from aqueous media is essential to ensure water sustainability and to provide safe freshwater availability to population. Electrospun chitosan (CS) nonwoven mats are efficient at removing heavy metals from aqueous media. However, they suffer from low permeability and low-mechanical strength. They are also unable to remove contaminants in a nonselective way. A bilayer sorbent media made of a porous phosphorylated cellulose substrate covered by electrospun CS nanofibers was developed to overcome those weaknesses. The hydrophilic composite shows good water permeability and mechanical strength with appropriate thermal and chemical characteristics. Adsorption tests with Cd(II) indicate that pseudo-second order and Langmuir models best fitted experimental data, with a maximum adsorption capacity of 591 mg/g at 25 C. Adsorption with multielement samples containing Cr(VI), Cu(II), Cd(II), and Pb(II) also reveal their capability to remove them in a selective way. This mechanically resistant, hydrophilic, and permeable adsorbent media was able to capture both cationic and anionic metallic contaminants.

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Wastewater tertiary treatment options to match reuse standards in agriculture

Cited by 61 publications

References 26 publications

Efficiency of an Integrated Purification System for Pig Slurry Treatment under Mediterranean Climate

Efficiency of an Integrated Purification System for Pig Slurry Treatment under Mediterranean Climate

How to Overcome Barriers for Wastewater Agricultural Reuse in Sicily (Italy)?

Phosphorylated cellulose/electrospun chitosan nanofibers media for removal of heavy metals from aqueous solutions

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