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Environmental Science & Technology 2018
Journal of Environmental Research
Page 49
March 29-31, 2018
Vienna, Austria
4
th
Edition of International Conference on
Environmental Science
& Technology 2018
T
hisstudyfocusedontheeffectofdifferentsludgeconcentration
on the performances of an algal-activated sludge symbiotic
system in terms of wastewater treatment, algal-activated
sludge characteristics and community structure. The results
showed that the highest wastewater treatment performances
were obtained in the reactor R2 (sludge concentration of 700
mg/L) with sCOD, NH
4
+
-N and PO
4
3-
-P removal efficiencies
of 90.6±2.3%, 97.69± 2.6% and 83.81±2.3% respectively. The
relative coefficient between Chlorophyll-a (Chl-a) concentration
and nutrients removal was in the declining trend of NH
4
+
-N >
PO
4
3-
-P > sCOD, and decreased with the increase of sludge
concentration indicating the increased sludge concentration
inhibited the growth of algae. Further investigation exhibited
that different sludge concentration resulted in the changes
of dissolved oxygen (DO) and pH influencing the wastewater
treatment and algae growth in the symbiotic system. Under the
situation of nutrient deficiency, algae displayed superior nutrient
utilization ability than sludge bacteria, contributing to the death
and disintegration of sludge bacteria which led to the decline of
total soluble solid (TSS) content after day 4. In addition, analysis
on the extracellular polymeric substances (EPS) production and
Ps/Pr results revealed that the better nutrients removal and
algae growth and the preferable settleability in R2 was positively
related to its higher EPS production (99.79 mg/g-VSS) and Ps/Pr.
The denaturing gradient gel electrophoresis (DGGE) profiles and
gene sequences analysis demonstrated that some new species
appeared and the functional microorganism was enriched under
different sludge concentration, suggesting that both bacteria and
algae had a selective power for particular members of each other.
This study would provide some novel insights into the relationship
between algal-activated sludge and be helpful to develop the
algae-activated sludge system.
Biography
Li Sun is from School of Environment in Harbin Institute of Technology. She
is also a PhD candidate and a member of the State Key Laboratory of Urban
Water Resource and Environment.
sunli_hit@163.comPerformance analysis of an algal-activated sludge symbiotic
system on wastewater treatment, algal-activated sludge
characteristics and community structure: Effect of sludge
concentration
Li Sun, Yu Tian
and
Jun Zhang
Harbin Institute of Technology, China
Li Sun et al., J Environ Res, Volume 2