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Research Journals >
Indian Journal of Biotechnology (IJBT) >
IJBT Vol.09 [2010] >
IJBT Vol.09(3) [July 2010] >
| 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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