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The Operating Characteristics of Partial Nitrification by Controlling pH and Alkalinity

High-Tech Research Institute, Beijing University of Chemical Technology, Beijing 100029, China
Heros (Beijing) Environmental Technology Co., Ltd., Beijing 100029, China
Author to whom correspondence should be addressed.
Academic Editor: JiaQian Jiang
Water 2021, 13(3), 286;
Received: 15 December 2020 / Revised: 17 January 2021 / Accepted: 19 January 2021 / Published: 25 January 2021
(This article belongs to the Special Issue Advances in the Technologies for Water and Wastewater Treatment)
In many experiments, a partial nitrification device is initiated with the use of highly active nitrating sludge because of the large number of nitrifying bacteria. Ammonia-oxidizing bacteria (AOB) are more adaptable to low-dissolved oxygen environments than nitrite-oxidizing bacteria (NOB). NOB activity was inhibited when the dissolved oxygen (DO) levels were decreased, causing the nitrate-nitrogen concentration to gradually decrease in the effluent and the nitrite-nitrogen concentration to gradually increase, achieving the accumulation of nitrous nitrogen. In this experiment, a sequencing batch reactor (SBR) was used to suppress NOB activity at a given pH while maintaining DO at a very low level so that the ammonia–water reaction mainly occurred in the device, and then the mud and water separated. Compared with other experiments, this approach can occur in 25 days, and it runs stably for more than two months until the device closes when the ammonia-nitrogen concentration is about 170 mg/L. This experiment also compared the difference between the pH change at the beginning of the device operation and after the device was stable. In order to increase the efficiency of bacterial appreciation, supplementing NaHCO3 increased the HCO3 concentration by 300 mg/L on the 25th day. It was found that some nitrification reactions still occurred, but they were not enough to destabilize the device. The nitrosate accumulation efficiency still gradually increased, and the average nitrite accumulation efficiency was 87.25% after NaHCO3 supplementation. View Full-Text
Keywords: pH; partial nitrification; alkalinity; SBR pH; partial nitrification; alkalinity; SBR
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MDPI and ACS Style

Chen, C.; Song, Y.; Yuan, Y. The Operating Characteristics of Partial Nitrification by Controlling pH and Alkalinity. Water 2021, 13, 286.

AMA Style

Chen C, Song Y, Yuan Y. The Operating Characteristics of Partial Nitrification by Controlling pH and Alkalinity. Water. 2021; 13(3):286.

Chicago/Turabian Style

Chen, Chen, Yinghao Song, and Yanchao Yuan. 2021. "The Operating Characteristics of Partial Nitrification by Controlling pH and Alkalinity" Water 13, no. 3: 286.

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