模拟自然光周期下外源性CO2对城市污水藻类生长和污水处理的影响(摘选)
Effect of Exogenous CO2 on Algae Growth and Wastewater Treatment under Simulated Natural LightDark Cycle using Municipal Wastewater as Feedstock(Extracts)
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摘要: 探讨了不同光照强度和模拟自然光周期条件下,高浓度生物污水中外源CO2对小球藻(Chlorella kessleri)生物量累积和污水中养分去除的影响。研究结果表明,在所有光强处理情况下,模拟光周期和施加CO2使得Chlorella kessleri能容易地适应反应器中的废水浓度。CO2浓度和光强显著影响藻类生长和污水中养分去除。藻类生长的最适CO2浓度是2.5%。当光强达到一定的下限时,由于光合自养效率显著减少,因此补充CO2的效果最小。同时,由于在第8天时养分耗尽和藻类生物累积量减少,对于持续或分批培养系统的应用体系,应优先选择分批培养的方式。Abstract: This study investigated the effect of exogenous CO2 on algae biomass accumulation and wastewater nutrient removal under different light intensities and a simulated natural lightdark cycle for algae strain Chlorella kessleri,using highly concentrated municipal wastewater(centrate)as feedstock.The results showed that Chlorella kessleri could easily adapt to centrate wastewater in batch reactors under simulated natural lightdark cycles with CO2 injections under all tested light intensities.Both CO2 concentration and light intensity had a significant effect on algae growth and nutrient removal from wastewater.The study confirmed that there was an optimum CO2 level for algae growth,which was 2.5% for this investigation.When the light intensity reached a certain lower limit,the effect of CO2 supplementation became minimum because the photoautotrophic efficiency was significantly reduced.It is also found that the application of continuous or fed-batch cultivation system was preferred over batch cultivation process due to the fact that the nutrients was depleted and the algae biomass concentration decreased on Day 8.
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Keywords:
- Algae /
- Municipal wastewater /
- Exogenous CO2 /
- Light intensity /
- Biomass accumulation /
- Wastewater treatment
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