Organic matter accumulation during maturation of gravel-bed constructed wetlands treating farm dairy wastewaters

Tanner, Chris C.; Sukias, J.P.S.; Upsdell, M.

doi:10.1016/s0043-1354(98)00078-5

Cited by 145 publications

(95 citation statements)

References 26 publications

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“…For instance, the HRT increased from 13.4 to 20.1 h when the operation time increased from 29 to 141 days with COD concentration of 173.62 mg/L. This phenomena already described by Tanner et al (1998), who found a clear relationship between the hydraulic residence time and solids accumulation. The reason is effective porosity of starch-fed systems decreased due to detained starch particles in the upper layer, which decreased wastewater velocity, and the substrate of glucose-fed systems did not clog due to the balance between biological growth and bacterial decay after start-up period (Okabe et al 1998).…”

Section: Hydraulic Retention Time Of Two Swisssupporting

confidence: 62%

Characteristics of subsurface wastewater infiltration systems fed with dissolved or particulate organic matter

Pan

2013

Int. J. Environ. Sci. Technol.

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The influent type of organic matter (dissolved or particulate) on the characteristics of two subsurface wastewater infiltration systems (SWISs) was investigated. One of the SWISs was fed with dissolved organic matter (glucose, assumed to be readily biodegradable) and the other with particulate organic matter (starch, assumed to be slowly biodegradable). Results showed that both biofilm growth and particle accumulation in substrate could reduce the effective porosity and infiltration rate of SWIS, especially for the high organic matter concentration wastewater. The reduction in effective porosity and infiltration rate was primarily caused by organic particle accumulation. The contribution of the accumulated organic particle to the process of clogging was greater than that of biofilm growth and the clogging mainly occurred in the upper layer in starch-fed systems. The SWISs fed with glucose were not clogged till the end of experiments. The hydraulic retention time (HRT) increased with time in start-up period and was almost invariable after mature in glucose-fed systems; in starch-fed systems, clogging of substrate prolonged the HRT. The two identical experimental SWISs were almost equal efficiencies for the removal of chemical oxygen demand (COD). The removal efficiencies of COD were not influenced by clogging under the experimental conditions. Ammonia N removal efficiency was higher in glucose-fed systems than that in starch-fed systems.

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Section: Hydraulic Retention Time Of Two Swisssupporting

confidence: 62%

Characteristics of subsurface wastewater infiltration systems fed with dissolved or particulate organic matter

Pan

2013

Int. J. Environ. Sci. Technol.

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“…The positive effect of peat on ET can be explained on the one hand by the better growth conditions it offered to plants (presence of more plant biomass). On the other, the effect of peat on mesocosms hydraulic behavior was hypothesized to be similar to accumulated organic matter appearing in constructed wetlands over time [18]. As observed between the two unplanted units, peat enhanced the retention by acting as a sponge.…”

Section: Performance Modelsmentioning

confidence: 98%

Modeling the Effect of Plants and Peat on Evapotranspiration in Constructed Wetlands

Chazarenc

Naylor

Comeau

et al. 2010

International Journal of Chemical Engineering

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Evapotranspiration (ET) in constructed wetlands (CWs) represents a major factor affecting hydrodynamics and treatment performances. The presence of high ET was shown to improve global treatment performances, however ET is affected by a wide range of parameters including plant development and CWs age. Our study aimed at modelling the effect of plants and peat on ET in CWs; since we hypothesized peat could behave like the presence of accumulated organic matter in old CWs. Treatment performances, hydraulic behaviour, and ET rates were measured in eight 1 m 2 CWs mesocosm (1 unplanted, 1 unplanted with peat, 2 planted with Phragmites australis, 2 planted with Typha latifolia and 2 planted with Phragmites australis with peat). Two models were built using first order kinetics to simulate COD and TKN removal with ET as an input. The effect of peat was positive on ET and was related to the better growth conditions it offered to macrophytes. Removal efficiency in pilot units with larger ET was higher for TKN. On average, results show for COD a k 20 value of 0.88 d −1 and 0.36 d −1 for TKN. We hypothesized that the main effect of ET was to concentrate effluent, thus enhancing degradation rates.

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“…2017 464 Nonetheless, many authors disagree on the main factors contributing to porous medium clogging. For WINTER & GOETZ (2003), affluent characteristics are preponderant whereas, for TANNER et al (1998), plant solids would be more important for decreasing the useful volume. CASELLES-OSORIO et al (2007) attributed clogging to recalcitrant organic material accumulated in porous medium whereas WANG et al (2010) credited this phenomenon to microbial growth and biofilm-associated substances (exopolymers).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Clogging Material From Horizontal Subsurface Flow Constructed Wetland Systems

Miranda

Matos

et al. 2017

Eng. Agríc.

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This study aimed to characterize the material composition responsible for clogging the porous medium of horizontal subsurface flow constructed wetland (HSSF-CW) systems, which is detrimental to a proper system operation. Six completely clogged HSSF-CWs were used after treatment of swine wastewater. Operating conditions of these systems were named CW-C (HSSF-CW 1 and HSSF-CW 4, non-cultivated, i.e. controls), CW-T (HSSF-CW 2 and HSSF-CW 5, cultivated with Tifton 85 (Cynodon spp.)), and CW-A (HSSF-CW 3 and HSSF-CW 6, cultivated with alligator weed (Alternanthera philoxeroides)). The results showed that most of the clogging material was composed of total fixed solids (95, 84, and 82% in CW-C, CW-T, and CW-A, respectively). However, total volatile solids (TVS) mostly affected pore clogging. The larger accumulations and productions of TVS in CWs might have originated from dead plants.

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Organic matter accumulation during maturation of gravel-bed constructed wetlands treating farm dairy wastewaters

Cited by 145 publications

References 26 publications

Characteristics of subsurface wastewater infiltration systems fed with dissolved or particulate organic matter

Characteristics of subsurface wastewater infiltration systems fed with dissolved or particulate organic matter

Modeling the Effect of Plants and Peat on Evapotranspiration in Constructed Wetlands

Characterization of Clogging Material From Horizontal Subsurface Flow Constructed Wetland Systems

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