Effects of Hydraulic Retention Time (HRT)
on the Performance of a Pilot-Scale Trickling
Filter System Treating Low-Strength
Domestic Wastewater

Rehman, Abdul; Ayub, Nasir; Perveen, Irum; Ahmed, Safia

doi:10.15244/pjoes/98998

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…After treatment, the efficiency of laboratory scale CWs in terms of pathogen removal was highly significant ( p = 0.001), and about 73.1–99.7% reduction was observed in CFU/ml and 43.5–86.7% in MPN/100 ml index during overall treatment operation as shown in Table 3. Reduction in microbial count had also been directly linked with the removal of organic and inorganic pollutants; therefore, due to nutrient depletion, natural die‐off process would take place (Khan et al, 2015; Rehman et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Bio‐purification of domestic wastewater through constructed wetland planted with Paspalidium flavidum

Rehman

Zakir

Anees

et al. 2022

Water Environment Research

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The current study was aimed to designed laboratory scale constructed wetland (CW) for the treatment of domestic wastewater under temperature range (18-38 C) and hydraulic retention times (24 and 48 h). Besides, the soil of vegetative unit of CW was assessed using conventional culturing techniques, and 13 different bacterial species (Escherichia coli, Micrococcus, Pseudomonas, Proteus, Klebsiella, Streptococcus, Alcaligenes, Salmonella, Bacillus, Enterobacter, Staphylococcus, Shigella and Corynebacterium spp.) were determined. The pathogenic microbial load was high in influent samples, but after treatment, about 73.1-99.7% and 43.5-86.7% reduction in CFU/ml and MPN/100 ml index, respectively, were observed. Moreover, the organic loads in terms of COD, TDS, TSS, and turbidity were high in all influent samples, but after treatment, average percentage removal in different physico-chemical parameters was observed during overall treatment operations, that is, COD (59.7-65.6%), TDS (59.6-76.8%), TSS (64.9-76.7%), and turbidity (72.7-91.6%), while pH of the effluent samples was observed in the prescribed limits. It was concluded that laboratory scale CW using natural flora Paspalidium flavidum and bacterial species was efficient in the reduction of different pollution indicators and hence a best option to be modified on pilot-scale for wastewater treatment in the rural regions of Peshawar. Practitioner Points• Role of retention times on performance of CW were studied.• The commonly existing vegetation was utilized to treat domestic waste water.• Both vegetations and HRT are key ingredients in obtaining high treatment efficiency.

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Section: Resultsmentioning

confidence: 99%

Bio‐purification of domestic wastewater through constructed wetland planted with Paspalidium flavidum

Rehman

Zakir

Anees

et al. 2022

Water Environment Research

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“…The calculations were performed in MS Excel to obtain the complementary error function (erfc) easily. In this study, the parameter values are chosen as follows: (10)…”

Section: D) Breakthrough Curvementioning

confidence: 99%

“…Unfortunately, the majority of developing and under-developed countries are facing a lack of proper strategies for the management of large amounts of wastewater discharged from various domestic and industrial sectors [9] (Wang et al 2020). Wastewater treatment processes can be broadly characterized as physicochemical and biological methods [10,11].…”

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confidence: 99%

Determination of microbial contamination of urban runoff and reduction of microbial load using new column and biological batch filter design

Parvinnia,

Sirouspour,

Khalili

2023

Preprint

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In this study first, amounts of coliform contamination were measured by sampling from urban runoff of Yasouj city, Iran. In order to designing column experiments, zeolite, anthracite, sand, iron filings, sawdust, geotextile and polyester fiber were used. In the next step, batch experiments were designed: PRB materials included 25% anthracite, 20% zeolite, 20% iron filings, 10% sawdust and 25% sand. This experiment was performed in two ways: with and without the availability of nutrients. For all experiments, E. coli used as biological contaminants and bacterial enumerations were done by MPN test. Amounts of coliform contamination in urban runoff were at the 93 to 1200 instance. The results of the column experiments showed that removability of these materials was 90.48 to 96.13% and materials saturated after operated for some time and it shows the phenomena detachment of pollutants. The results of batch experiment showed bacterial elimination 91.55–93.18% and detachment rate with and without nutrients 0.2% and 0.14% rate attachment respectively. Coefficients, growth rates, death rates, rates of attachment and detachment were 0.1396, 0.1633, 0.396 and 0.0555 per unit time, respectively. As a supplementary case, modeling of contaminant transport in the porous medium of a new biological filter was also investigated. Synthetic wastewater with an initial nitrate concentration of 100 mg/l is introduced to the filter over 25 minutes of the filter breakthrough curve (BTC). The BTC from the column test is assumed as a normal curve and the obtained longitudinal dispersion coefficient is equal to 1×10− 7m2/s.

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“…Unfortunately, the majority of developing and under-developed countries are facing a lack of proper strategies for the management of large amounts of wastewater discharged from various domestic and industrial sectors (Wang et al 2020). Wastewater treatment processes can be broadly characterized as physicochemical and biological methods (Rehman et al 2020;Danish et al 2011).…”

Section: -Introductionmentioning

confidence: 99%

Modeling a pilot-scale bio-geo-filter for removing soluble nitrate

Sirouspour

Parvinnia

Shokrollahi

et al. 2023

Preprint

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This study uses alternate layers of non-woven geotextile and granular soil to remove soluble nitrate. The mixing weight ratios of PRB materials are 25% sand, 25% anthracite, 20% zeolite, 20% iron filings, and 10% poplar sawdust. Synthetic wastewater with an initial nitrate concentration of 100 mg/l is introduced to the filter over 25 minutes of the filter breakthrough curve (BTC). The BTC from the column test is assumed as a normal curve and the obtained longitudinal dispersion coefficient is equal to 1×10− 7m2/s. The filter reduces the amount of nitrate by 99% within nine days. CTRAN/W software properly estimates the contaminant transport in the filter. However, the BTC obtained by the software cannot estimate the total time for a complete breakthrough under laboratory conditions. At the same time, it can determine the nitrate breakthrough time close to the experimental model.

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Effects of Hydraulic Retention Time (HRT) on the Performance of a Pilot-Scale Trickling Filter System Treating Low-Strength Domestic Wastewater

Cited by 10 publications

References 26 publications

Bio‐purification of domestic wastewater through constructed wetland planted with Paspalidium flavidum

Bio‐purification of domestic wastewater through constructed wetland planted with Paspalidium flavidum

Determination of microbial contamination of urban runoff and reduction of microbial load using new column and biological batch filter design

Modeling a pilot-scale bio-geo-filter for removing soluble nitrate

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