Your search found 5 records
1 Pavelic, Paul; Dillon, P. J.; Chusanathas, S. 2009. Lessons drawn from ASR pilot trials in alluvial aquifers in Australia and Thailand. [Extended abstract] Paper presented at the International Symposium on Efficient Groundwater Resources Management, IGS-TH 2009, Bangkok, Thailand, 16-21 February, 2009. pp.91-92.
(Location: IWMI HQ Call no: e-copy only Record No: H042540)
(0.35 MB)
2 Nadee, S.; Srisuk, K.; Sarapirom, P.; Pavelic, Paul; Uppasit, S. 2010. Field and laboratory experiments to investigate infiltration processes and clogging effects from a ponding recharge system at Ban Nong Na, Bangrakum District, Phitsanulok Province, Lower Yom River Basin, Thailand. Paper presented at ISMAR7, Theme - Water Reuse and MAR, Abu Dhabi, UAE, 9-13 October 2010. 7p.
Infiltration ; Clogging ; Groundwater ; Aquifers ; Recharge ; Experiments / Thailand / Lower Yom River Basin / Ban Nong Na / Bangrakum District / Phitsanulok Province
(Location: IWMI HQ Call no: e-copy only Record No: H043328)
(0.83 MB)
A small-scale field experiment consisting of surface infiltration tests was conducted at Ban Nong Na, located in Bangrakum District, Phitsanulok Province, situated in the Lower Yom River Basin. The shallow groundwater in this area has been heavily pumped for growing rice all year round, and within the past decade static water levels within the gravel, sand and silt aquifers have decreased to a depth of up to ten meters below the ground surface. Research is currently being conducted to investigate the feasibility of managed aquifer recharge by surface ponding methods in the Lower Yom River Basin. This study, which forms one component of the broader project, aims to assess infiltration processes and clogging effects at the laboratory (column) scale and at the small scale (25 m2) in the field. The laboratory experiment consisted of two main components: 1) physical, chemical and biological analyses of raw water and the ambient groundwater and 2) soil column testing under constant head conditions over a period of 100 hours. The field experiment consisted of three main components: 1) characterization of the physical and hydraulic properties of the unsaturated and saturated media 2) pretreatment design considering levels of turbidity removal using synthetic poly and sand filter, and 3) infiltration testing under constant head conditions over a period of 30 hours. These works are intended to provide the design criteria for establishing a larger scale (1,600 m2) pilot recharge system at the study site. Average infiltration rates for the laboratory experiment for source waters with mean turbidities of 0.5 and 100 NTU were found to be 3.27 and 0.15 m/d respectively. The infiltration rate from the field experiment with an average turbidity 50 NTU was 2.53 m/d; a magnitude commensurate with the lab study. Since infiltration rates in excess of 1 m/day are desirable for the pilot trial, the turbidity of the raw canal water used for recharge will be controlled to be less than 50 NTU. Whilst both the laboratory and field experiments were brief and longer test periods needed, more extensive investigations will be performed over the 2010 monsoon season during the full-scale pilot trial.
3 Wakelin, S. A.; Page, D. W.; Pavelic, Paul; Gregg, A. L.; Dillon, P. 2010. Rich microbial communities inhabit water treatment biofilters and are differentially affected by filter type and sampling depth. Water Science and Technology, 10(2):145-156. [doi: https://doi.org/10.2166/ws.2010.570]
(Location: IWMI HQ Call no: e-copy only Record No: H043329)
(1.40 MB)
Factors affecting microbial diversity (richness) and community structure in biofilter columns were investigated. At a pilot filtration plant, granular activated carbon (GAC), anthracite and sand-based filters were used to treat stormwater from an urban catchment. After 12 weeks operation, sand media filters clogged (hydraulic conductivity declining by 90%) and all filters were destructively sampled. All biofilters had similar levels of polysaccharide in the surface layer, however only the sand columns clogged. This clogging may have been due to a combination of polysaccharide and small particle size, the development of a sand-specific microbial community, or other biogeochemical interactions. DNA fingerprinting was used to show that bacterial, archaeal and eukaryotic communities were present in all filter types and at all sampling depths (to 45 cm). The bacterial community was far richer (Margalefs index, d, 1.5–2) than the other groups. This was consistent across filter types and sampling depths. The structure of the bacteria and archaea communities in sand filters differed to those in GAC and anthracite filters (P<0.05). In contrast, eukaryotic communities were similar in surface biofilm layers, irrespective of filter type. As such, physicochemical properties of filters differentially influence the microbial community. Furthermore, we have established that archaea are distributed throughout biofilters; the role of these microorganisms in water treatment and filter function, particularly clogging, requires attention.
4 Pavelic, Paul; Dillon, P. J.; Mucha, M.; Nakai, T.; Barry, K. E.; Bestland, E. 2011. Laboratory assessment of factors affecting soil clogging of soil aquifer treatment systems. Water Research, 45(10):3153-3163. [doi: https://doi.org/10.1016/j.watres.2011.03.027]
Soils ; Clogging ; Aquifers ; Recycling ; Water quality ; Water reuse ; Soil properties ; Analytical methods ; Laboratory experimentation ; Hydraulic conductivity
(Location: IWMI HQ Call no: e-copy only Record No: H043808)
(0.80 MB)
In this study the effect of soil type, level of pre-treatment, ponding depth, temperature and sunlight on clogging of soil aquifer treatment (SAT) systems was evaluated over an eight week duration in constant temperature and glasshouse environments. Of the two soil types tested, the more permeable sand media clogged more than the loam, but still retained an order of magnitude higher absolute permeability. A 6- to 8-fold difference in hydraulic loading rates was observed between the four source water types tested (one potable water and three recycled waters), with improved water quality resulting in significantly higher infiltration. Infiltration rates for ponding depths of 30 cm and 50 cm were higher than 10 cm, although for 50 cm clogging rates were higher due to greater compaction of the clogging layer. Overall, physical clogging was more significant than other forms of clogging. Microbial clogging becomes increasingly important when the particulate concentrations in the source waters are reduced through pre-treatment and for finer textured soils due to the higher specific surface area of the media. Clogging by gas binding took place in the glasshouse but not in the lab, and mechanical clogging associated with particle rearrangement was evident in the sand media but not in the loam. These results offer insight into the soil, water quality and operating conditions needed to achieve viable SAT systems.
5 Anigrou, Y.; Bahlami, A.; El Khlif, M. 2022. Methodology for an ecological solution of subsurface flow constructed wetlands used in the treatment of greywater. Water Practice and Technology, 17(12):2581-2597. [doi: https://doi.org/10.2166/wpt.2022.150]
Wastewater treatment ; Wetlands ; Ecological factors ; Evapotranspiration ; Methodology ; Water treatment ; Drinking water ; Water balance ; Septic tanks ; Pollutants ; Clogging ; Vegetation / Morocco / Bangladesh / India / Italy / Tunisia
(Location: IWMI HQ Call no: e-copy only Record No: H051593)
https://iwaponline.com/wpt/article-pdf/17/12/2581/1155668/wpt0172581.pdf
https://vlibrary.iwmi.org/pdf/H051593.pdf
https://vlibrary.iwmi.org/pdf/H051593.pdf
(0.82 MB) (840 KB)
Hammams or public baths continue to consume substantial quantities of drinking water up to 120 m3/day and discharge equivalent quantities of greywater. These hammams thus become an important source of this greywater, which can be easily treated using constructed wetlands (CWs). In this context, the present study proposes to practitioners a general method for sizing subsurface flow (SSF) CWs for the treatment of greywater discharged from hammams. It is oriented to simple applications such as irrigation, car washing and toilet flushing. Due to the complexity of quantifying the evapotranspiration (ET) of the treated water at the CWs, a practical and flexible method is presented here to calculate ET. In the end, a case study of a Moroccan hammam has been treated and discussed. It provides the designers of SSF CWs with a concrete example of the application of the proposed methodology.
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