The Introduction of Eichhornia Crassipes into the High Rate Algal Pond to Remove Nitrogen from Wastewater
The treatment of wastewater using algal cultures has been researched and developed since 1950. The High Rate Algal Pond (HRAP) is the most efficient of this type of treatment, particularly for nitrogen removal. However, the main problem with the HRAP is the high level of organic suspended solid...
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| 格式: | Thesis |
| 語言: | English English |
| 出版: |
1998
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| 主題: | |
| 在線閱讀: | http://psasir.upm.edu.my/id/eprint/9446/1/FSAS_1998_34_A.pdf |
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| 總結: | The treatment of wastewater using algal cultures has
been researched and developed since 1950. The High Rate
Algal Pond (HRAP) is the most efficient of this type of
treatment, particularly for nitrogen removal. However,
the main problem with the HRAP is the high level of
organic suspended solids in the treated wastewater.
Furthermore, nutrients released from the lysis of algal
cells may give rise to eutrophication in the receiving
water. A laboratory-scale experiment was carried out using
the HRAP in the company of anaquatic plant,
waterhyacinth Eichhornia crassipes, as an integrated
system to remove nitrogen from wastewater. The dominant
algal species used was Chlorella vulgaris.
Twenty runs in t he bat ch mode were operated under
the conventional HRAP and the HRAP - waterhyacinth combination system. Three runs were operated in the
continuous mode using the HRAP - waterhyacinth system with
50% surface area coverage and 3 different retention times
(3 days, 6 days, and 9 days). Comparison of the conventional HRAP and the HRAP waterhyacinth system for treating diluted raw wastewater
from rubber latex concentrate processing revealed better
nitrogen removal efficiency by the HRAP-waterhyacinth
system. Total Kjeldahl Nitrogen in the treated wastewater
was 23% lower in the HRAP with waterhyacinth than that in
the normal HRAP. Significant reduction of suspended
solids was also recorded. Total Suspended Solids of the
effluent in the HRAP-waterhyacinth system was generally
less than 50mg/L wherea sit was greater than 450mg/L in
the conventional HRAP. |
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