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BIOFILM START-UP ON DIFFERENT

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BIOFILM START-UP ON DIFFERENT. FILTER MEDIA. Min Jiang, Weiwei Miao, Chunfang Luo ... General conditions of the recirculating system. Volume of Waste water: 10L ... – PowerPoint PPT presentation

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Title: BIOFILM START-UP ON DIFFERENT


1
BIOFILM START-UP ON DIFFERENT FILTER MEDIA
Min Jiang, Weiwei Miao, Chunfang Luo Shanghai
Ocean University 9-Nov-14
2
Travel funding for this presentation was provided
by AquaFish Collaborative Research Support
Program
  • AquaFish CRSP
  • USAID

The Aquaculture CRSP is funded in part by United
States Agency for International Development
(USAID) Grant No. EPP-A-00-06-00012-00. The
opinions expressed herein are those of the
authors and do not necessarily reflect the views
of the US Agency for International Development.
3
  • Introduction
  • Materials and methods
  • Results and discussion
  • Conclusions

4
Filter media
5
  • Materials and methods

Aquaculture waste water
6
General conditions of the recirculating system
Volume of Waste water 10L Volume of Filter
220mL Velocity of flow 63.3L/h DO 7.50.23mg/L
pH 8.12
TAN-N (mg/L) 32.95
NO2-N (mg/L) 6.69
NO3-N (mg/L) 2.81
PO4-P (mg/L) 5.60
CODMn (mg/L) 82.37
Alk (mmol/L) 2.62
HT (mmol/L) 4.92
7
Bio-fiber fill
Netlike plastic fill
plastic ball
Five kinds of filter media
coral sand
porcelain ring
8
During the first 108h, water samples for quality
analyses were collected from the tank every 12h.
(830 2030) After that, samples were collected
every 24h. (830) The whole experiment lasted for
22days.
pH Environmental quality standards for surface water GB 38382002 Peoples Republic of China
TAN-N Environmental quality standards for surface water GB 38382002 Peoples Republic of China
NO2-N Environmental quality standards for surface water GB 38382002 Peoples Republic of China
NO3-N Environmental quality standards for surface water GB 38382002 Peoples Republic of China
PO4-P Environmental quality standards for surface water GB 38382002 Peoples Republic of China
CODMn Environmental quality standards for surface water GB 38382002 Peoples Republic of China
Alk Environmental quality standards for surface water GB 38382002 Peoples Republic of China
HT Environmental quality standards for surface water GB 38382002 Peoples Republic of China
9
  • Results and discussion

Nitrite increased corresponding to the rapidly
decreasing of TAN during the first phase of
start-up and kept growing up for 6 days after TAN
had reached a steadily low level. While nitrate
increased during all the experimental period.
Concentrations of TAN, NO2-N and NO3-N in the
biofilter with coral sand media changed
regularly.
10
Same situation happened in biofilters with the
other four media while the days needed to reach
the stable low concentration of NO2-N were
different.
11
During the start-up period, coral sand media
showed the best efficiency of turning TAN to
NO2-N and then NO3-N. NO2-N was less than 1.0
mg/L after 12 days. Netlike plastic fill and
porcelain ring were the worst. The intervenient
were plastic ball and bio-fibre fill.
12
pH and Total alkalinity decreased rapidly during
first several days and then increased slowly to
stable values. The biofilter with coral sand
media had higher pH and alkalinity than others.
13
pH and Total alkalinity decreased rapidly during
first several days and then increased slowly to
stable values. The biofilter with coral sand
media had higher pH and alkalinity than others.
14
Hardness in five filters nearly doubled after 22
days. Hardness in filters with coral sand,
bio-fibre fill and porcelain ring were higher
than the other two.
15
Phosphate-P was consumed. Biofilters with coral
sand and porcelain ring had less phosphate-P than
others.
16
Different ability of COD removal was approved in
5 biofilters.
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22
  • conclusions

Change of water quality regularity Biofilm
start-up coral sand mediagt plastic ball
bio-fibre fill gt Netlike porcelain ring
coral sand
Advantage (1)Biofilm forming rapidly (2)Alkalinity
and pH buffer (3)Higher consumption of
phosphate (4)Relatively higher COD removal
Disadvantage (1)Increasing hardness (2)Heavy
23
Thanks for your attention
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