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首页> 外文期刊>Water Science and Technology >Retrofitting conventional primary clarifiers to activated primary clarifiers to enhance nutrient removal and energy conservation in WWTPs in Beijing, China
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Retrofitting conventional primary clarifiers to activated primary clarifiers to enhance nutrient removal and energy conservation in WWTPs in Beijing, China

机译：在中国北京的污水处理厂中，将传统的一级澄清池改造为活化的一级澄清池，以提高养分去除效率和节约能源

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摘要

Biological nutrient removal requires sufficient carbon source. Meanwhile, the removal of organic matter in wastewater requires energy consumption in the aeration tank. Carbon source for nutrient removal in most wastewater treatment plants with conventional primary clarifier (CPC) is generally insufficient in China. In order to increase carbon source and to save energy, a part of the CPC may be retrofitted as an activated primary clarifier (APC). In this paper, a pilot scale experiment was conducted to examine the performance of primary sludge fermentation and its effect on nitrogen and phosphorus removal. Results show that the primary sludge fermentation in APC has produced a similar VFA/TP ratio but a higher BOD5/TN ratio compared with those in the CPC effluent, and the TN concentrations in the secondary effluent are at 8.0, 10.8, and 17.4 mg/L, while TP is at 0.45, 1.10, and 2.28 mg/L when the pilot test system was fed with (1) the APC effluent, (2) 50% from the APC effluent and 50% from the CPC effluent, and (3) the CPC effluent, respectively. Results also indicate that the BOD5/TN ratio is a more sensitive factor than the VFA/TP ratio for nutrient removal and energy conservation for the APC fermentation.
机译：生物营养物的去除需要足够的碳源。同时，去除废水中的有机物需要消耗曝气池中的能量。在中国，大多数使用常规一级澄清池（CPC）的废水处理厂中用于去除营养物的碳源通常不足。为了增加碳源并节省能源，可以将CPC的一部分改装为活化的一级澄清器（APC）。在本文中，进行了中试实验，以检验初级污泥发酵的性能及其对脱氮除磷的影响。结果表明，与CPC废水相比，APC中的初级污泥发酵产生了相似的VFA / TP比，但具有更高的BOD5 / TN比，并且次级废水中的TN浓度分别为8.0、10.8和17.4 mg / L，而给中试测试系统供给（1）APC废水，（2）APC废水的50％和CPC废水的50％以及TP分别为0.45、1.10和2.28 mg / L时，（3 ）。结果还表明，对于VPC / TP比率，BOD5 / TN比对于APC发酵的营养去除和节能更为敏感。

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