Removal of organic pollutants and nutrients from olive mill wastewater by a sand filter

Achak, M.; Mandi, Laila; Ouazzani, Naaila

doi:10.1016/j.jenvman.2009.03.012

Cited by 110 publications

(63 citation statements)

References 32 publications

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“…Accumulated matter on the upper sand layer of the BSF and BF is believed to have undergone humification and to have gradually clogged the pore space of the sand, hence reducing the permeability of the filter (Siegrist and Boyle, 1987). Clogging of the BF was delayed, possibly because of the larger sand bed and the larger particle size of the filter media (Achak et al, 2009). Filter cleaning was observed to result in an increase in the flow rates of the filters (Fig.…”

Section: Resultsmentioning

confidence: 99%

A comparative assessment of chemical contaminant removal by three household water treatment filters

Mahlangu¹,

Mamba²,

Momba³

2012

WSA

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This study was aimed at modifying the design of, constructing, evaluating and comparing chemical contaminant removal efficiency by, 3 household water treatment filters. The filters were: 1) biosand filter (BSF); 2) the ceramic candle filter (CCF); 3) bucket filter (BF). The filters were evaluated for their efficiency in removal of calcium, magnesium, iron and arsenic, nitrates, phosphates, fluorides, total organic carbon and turbidity, by determining levels of these contaminants in water before and after filtration through the filters. The effects of chlorophyll a concentration (mg/m 3 ) of intake water, as well as the effects of turbidity of intake water, on the flow rates of the filters was quantified and recommendations on the quality of water that could be filtered through these filters were made. Chlorophyll a concentrations in intake water had a positive correlation with the turbidity of the unfiltered water (r = 0.607).The flow rates of the filters were 0.8 ℓ/h -6.48 ℓ/h (BSF), 0.05 ℓ/h -2.495 ℓ/h (CCF) and 106.5 ℓ/h -160.5 ℓ/h (BF). Because of the large particle size materials used in constructing the BF and the design, which caused it to be a rapid sand filter, the biosand filter (BF) was found to have flow rates significantly higher than those of BSF and CCF (p ≥ 0.05). There was no difference in the efficiency of removal of metals (average 40% -50%) by the filters (p ≥ 0.05), as the same removal mechanisms (straining, ammonification, fixation and adsorption) were believed to be taking place in all of the filters. The CCF removed total organic carbon (TOC) (up to 39%) better than the BSF and BF (p ≤ 0.05). The filters removed turbidity effectively with the BSF having the highest reduction (70%). The average turbidity reduction efficiency was in the order BSF (70%) > BF (51%) > CCF (44%). The BSF, CCF and BF reduced turbidity and other contaminants even after filtering a total cumulative volume greater than 1 000 ℓ.

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Section: Resultsmentioning

confidence: 99%

A comparative assessment of chemical contaminant removal by three household water treatment filters

Mahlangu¹,

Mamba²,

Momba³

2012

WSA

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“…The percentage removal of PO 4 -P was 45%; this is due to adsorption to the filter material and microbial assimilation of phosphate in the growing biofilm. Since anoxic conditions that can lead to desorption of the PO 4 -P do not occur, removal efficiency is high but lower than the 95% reported by Hu et al [20] and the 99% removal achieved by Achak et al [21] after passing olive mill wastewater through sand.…”

Section: Resultsmentioning

confidence: 65%

Depth and performance evaluation of a laboratory scale sand filtration system for wastewater treatment

Sodamade¹,

Longe²,

Sangodoyin³

2014

Turkish J Eng Env Sci

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98.7% and 99.8%, and 92% and 90%, respectively, while PO 4 -P removal was about 45% in both columns. Unlike other parameters, NO 3 -N was increasing, which signifies that denitrification did not take place in the filter columns. Based on the results, the filter column of 50 cm is economically preferable due to the insignificant difference when compared with the 100-cm filter column. The bacteria removal was slightly higher in 100 cm depth (99.88%) than in 50 cm depth (99.68%).

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“…Achak et al [25] attributed such high ash content in the resulting biomasses to the high amount of Al, Mg, Ca, Fe, Sr, Pb and Li in OMW.…”

Section: Resultsmentioning

confidence: 99%

An Innovative Device to Convert Olive Mill Wastewater into a Suitable Effluent for Feeding Purple Non-Sulfur Photosynthetic Bacteria

et al. 2015

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A device (prototype) with a working volume of 200 L was used to deplete olive mill wastewater (OMW) of polyphenols. The OMW transformed into feedstock by means of the device was then used for feeding a lab-scale photobioreactor, just for testing the production of bioH2. The main novelty of this prototype consists in the combination of several adsorbent matrices and the exploitation of their synergic action. In this investigation, three matrices have been used: active carbon, Azolla and zeolite. The device was operated at an olive oil company located in the heart of the Chianti zone (Province of Florence, Italy). The efficiency of polyphenol removal obtained using the device was ≥96%. The multi-matrix effluent (MMeff) generated was then used to obtain three different culture broths containing 25%, 50% and 100% of MMeff, respectively. The diluted (with water) culture broths were suitable for hydrogen generation, with the highest hydrogen production rate (12.7 mL H2/Lculture/h) being obtained using 50% MMeff. The hydrogen yields were: 334 mL H2/L of MMeff, when feeding the photofermenter with pure effluent (100%); 1308 mL H2/L of MMeff, with the half-diluted effluent (50%, v/v); and 432 mL H2/L of MMeff, with the highest-diluted effluent (25%, v/v). OPEN ACCESSResources 2015, 4 622

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Removal of organic pollutants and nutrients from olive mill wastewater by a sand filter

Cited by 110 publications

References 32 publications

A comparative assessment of chemical contaminant removal by three household water treatment filters

A comparative assessment of chemical contaminant removal by three household water treatment filters

Depth and performance evaluation of a laboratory scale sand filtration system for wastewater treatment

An Innovative Device to Convert Olive Mill Wastewater into a Suitable Effluent for Feeding Purple Non-Sulfur Photosynthetic Bacteria

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