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Title: Polishing of biomethanated spent wash (primary treated) in constructed wetland: A bench scale study
Authors: Singh, P K
Sharma, K P
Sharma, Shweta
Swami, R C
Sharma, Subhasini
Keywords: Constructed wetland
COD
BOD
duckweed assay
fish assay
spent wash
Issue Date: Jul-2010
Publisher: CSIR
Abstract: This paper describes polishing of primary treated diluted spent wash (COD = 4000 - 10,000 mg/L) in the batch fed downflow constructed wetlands (surface area = 615 cm2, depth = 27.5 cm) filled 3/4th with a mixture (1:3) of coarse river sand and stone grit (length=2.0-3.0 cm, width=1.0-1.5 cm) and planted with Phragmites karka. The concentrated spent wash (COD > 5000 mg/L) was found toxic to shoots resulting in their etiolation in dose dependent manner. The reduction in COD (54-63%) and BOD (58-70%) values and their loads (COD = 78-98%, BOD = 81-95%) in the effluents were significant and independent of influent concentrations whereas colour removal (34-82%) was concentration dependent. Despite of the marked reduction in pollutant loads, effluents failed to meet discharge standards that limits wetland scope merely for reducing spent wash volume (COD = < 5000 mg/L) after which effluents may further be treated conventionally.
Page(s): 313-318
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Source:IJBT Vol.09(3) [July 2010]

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