POLYCHAETE ASSISTED SAND FILTER IN TREATING SYNTHETIC WASTEWATER
Loading...
Date
2014-09
Authors
HAJI BAHARUDIN, NURUL SYUHADA
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
This study is about polychaete assisted sand filter in treating synthetic wastewater.
To test the application of this concept, polychaete assisted sand filters were
experimentally tested for their ability to treat synthetic wastewater. The main
objective in this study was to examine the feasibility of polychaete assisted sand
filter for synthetic wastewater filtration. The comparison between beach and
construction sand in terms of percolation rate and water quality in polychaete
assisted sand filtration of synthetic wastewater was also investigated. Besides that,
the growth and survival of the polychaete at three different polychaete stocked
density (500, 100 and 1500/m2) after 7 weeks. Scale up (1:5) of the sand filter was
also studied to investigate the application of sand filter in larger scale. The results of
this study provided information on the study of polychaete assisted sand filter
performance in relation to percolation rate, water quality of wastewater and also
growth and survival of polychaete. Juvenile polychaete (Perinereis nuntia) was used
in sand filter and stocked at a control density of 1000 polychaete/m2. Synthetic
wastewater was prepared for the filtration by mixing ground dried fish pellets and sea
water. Synthetic wastewater percolating through polychaete assisted sand filter beds
were reliably treated where total suspended solids (TSS) levels were consistently
reduced by more than 70% by the process. pH, dissolved oxygen (DO) and
biochemical oxygen demand (BOD) levels were also lowered significantly by the
filtration process of polychaete assisted sand filter. However, for sand filter without
xvi
polychaete, the total suspended solid (TSS) was removed only 60% from the
filtration process. This comparative study clearly indicated that the sand filtration
stocked with polychaete has higher potential to treat wastewater than the sand filter
without polychaete. Both beach and construction sand filters showed similar
performance in terms of percolation rate and also water qualities of filtrate
wastewater as there was no significant difference (P≥0.05) between both sand. The
percolation rate effluent wastewater for sand filter using beach and construction sand
had the same trend, where sand filter using construction sand gave slightly higher
percolation rate value (0.26 L/m2s) than sand filter using beach (0.24 L/m2s). Thus,
beach and construction sands can be used as medium bed for sand filter. In this
study, it was proved that polychaete stocking density did affect percolation rate,
water quality of wastewater and polychaetes growth and survival. This was due to
the presence and quantity of polychaetes. Higher polychaete stocking density has
lower DO and TSS concentration which were around 4.25 mg/L and 182.04 mg/L,
meanwhile lower polychaete stocking density produced higher polychaete growth
and survival compared to higher polychaete stocking density. The survival rate of
polychaete after 7 weeks was lower at high polychaete stocking density, CH (71.85
%) in comparison to medium polychaete stocking density, CM (81.11 %) and low
polychaete stocking density, CL (100 %). The percentage of survival of polychaete
decreased as stocking density increased. From this work, scale up sand filter (1:5)
was comparable with small (control) sand filter as there was no significant difference
(P≥0.05) between small and larger sand filters in terms of pH, DO, TSS
concentration and also polychaetes growth and survival. For the conclusion,
polychaete assisted sand filters can be used to treat synthetic wastewater in filtration
process.
Description
Keywords
POLYCHAETE ASSISTED SAND FILTER