Cultivation of Green Algae Chlorella sp. in Different Wastewaters from Municipal Wastewater Treatment Plant
Cultivation of Green Algae Chlorella sp. in Different Wastewaters from Municipal Wastewater Treatment Plant
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DOI：
10.1007/s12010-009-8866-7
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发表时间：
2010-10
影响因子：
3
通讯作者：
Liang Wang;M. Min;Yecong Li;Paul Chen;Yifeng Chen;Yuhuan Liu;Yingkuan Wang;R. Ruan
中科院分区：
文献类型：
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作者：
Liang Wang;M. Min;Yecong Li;Paul Chen;Yifeng Chen;Yuhuan Liu;Yingkuan Wang;R. Ruan
本研究的目的是评估绿藻小球藻的生长。研究了从当地市政废水处理厂 (MWTP) 处理工艺流程的四个不同点采集的废水样本，以及藻类生长去除废水中氮、磷、化学需氧量 (COD) 和金属离子的效果。这四种废水分别是初沉前废水（#1废水）、初沉后废水（#2废水）、活性污泥池后废水（#3废水）和浓缩液（#4废水），即污泥离心机产生的废水。废水#1、#2、#3 和#4 的指数期内的平均比增长率分别为 0.412、0.429、0.343 和 0.948 day−1。废水#1、#2 和#4 的 NH4-N 去除率分别为 82.4%、74.7% 和 78.3%。对于 #3 废水，62.5% 的 NO3-N（主要无机氮形式）被去除，同时生成了 6.3 倍的 NO2-N。废水#1、#2 和#4 中的磷分别去除了 83.2%、90.6% 和 85.6%，COD 分别去除了 50.9%、56.5% 和 83.0%。 #3 废水中仅去除了 4.7%，并且藻类生长后 #3 废水中的 COD 略有增加，可能是由于藻类排泄光合有机小分子所致。研究发现，金属离子，尤其是浓缩液中的铝、钙、铁、镁和锰，可以被非常有效地去除。这项研究的结果表明，在营养丰富的浓缩液中生长藻类提供了一种在MWTP中应用藻类工艺来管理浓缩液返回的曝气池的营养负荷的新选择，起到减少营养物质和生产有价值的生物燃料原料的双重作用。
The objective of this study was to evaluate the growth of green algaeChlorellasp. on wastewaters sampled from four different points of the treatment process flow of a local municipal wastewater treatment plant (MWTP) and how well the algal growth removed nitrogen, phosphorus, chemical oxygen demand (COD), and metal ions from the wastewaters. The four wastewaters were wastewater before primary settling (#1 wastewater), wastewater after primary settling (#2 wastewater), wastewater after activated sludge tank (#3 wastewater), and centrate (#4 wastewater), which is the wastewater generated in sludge centrifuge. The average specific growth rates in the exponential period were 0.412, 0.429, 0.343, and 0.948 day−1for wastewaters #1, #2, #3, and #4, respectively. The removal rates of NH4–N were 82.4%, 74.7%, and 78.3% for wastewaters #1, #2, and #4, respectively. For #3 wastewater, 62.5% of NO3–N, the major inorganic nitrogen form, was removed with 6.3-fold of NO2–N generated. From wastewaters #1, #2, and #4, 83.2%, 90.6%, and 85.6% phosphorus and 50.9%, 56.5%, and 83.0% COD were removed, respectively. Only 4.7% was removed in #3 wastewater and the COD in #3 wastewater increased slightly after algal growth, probably due to the excretion of small photosynthetic organic molecules by algae. Metal ions, especially Al, Ca, Fe, Mg, and Mn in centrate, were found to be removed very efficiently. The results of this study suggest that growing algae in nutrient-rich centrate offers a new option of applying algal process in MWTP to manage the nutrient load for the aeration tank to which the centrate is returned, serving the dual roles of nutrient reduction and valuable biofuel feedstock production.