%0 Journal Article
%T Nitrogen and Phosphorous Removal in Municipal Wastewater Treatment Plants in China: A Review
%A Yong Qiu
%A Han-chang Shi
%A Miao He
%J International Journal of Chemical Engineering
%D 2010
%I Hindawi Publishing Corporation
%R 10.1155/2010/914159
%X Surface water environment in China was degraded rapidly in the last two decades, resulting in increasingly tighten criteria issued for municipal wastewater treatment plants (WWTPs). This paper reviewed the recent advances of process design and operational optimization for nutrients removal. Three major processes, as anaerobic-anoxic-oxic (AAO) process, oxidation ditch (OD), and sequencing batch reactor (SBR) occupied 65% of WWTPs amounts and 54% of treatment volumes of China in 2006. However conservative process designs and operational faults often impaired the process performances and energy efficiency. Therefore, typical processes were modified, combined, and innovated to meet the requirements of the diverse influent characteristics and lower energy consumptions. Furthermore, operational optimization techniques by modeling, simulation, and real-time control were also developed and applied in China to improve the process operation. Although great efforts had been contributed to improve the WWTPs performances in China, attentions should be continuously paid to the introduction, instruction, and implementation of advanced techniques. At last, the technical demands and appropriated techniques of WWTPs in China were briefly discussed. 1. Introduction In the last two decades, surface water environment in China was rapidly degraded by the booming industrialization and fast urbanization. The first large scale municipal wastewater treatment plant (WWTP) in China was constructed and operated 25 years ago [1]. In recent ten years, the construction of municipal WWTPs was catalyzed by the serious deterioration of surface water around cities, as shown in Figure 1. The reduction of ammonia nitrogen (NH3¨CN) and total phosphorous (TP) are also shown in the figure [2] in the unit of part per million (ppm) and also mg/L in water. The ammonia reduction was only 13.2 to 18.3£¿mgN/L and the phosphorous reduction was almost constant at 2.5£¿mgP/L from 2001 to 2007 [1], implying unsatisfied process performances in current WWTPs. Figure 1: Nutrients reduction in municipal WWTPs based on treated wastewater in China. The rapid development of municipal WWTPs and their unsatisfied performances promoted the engineering innovations, as well as the academic studies. In this paper, the recent progresses of nitrogen and phosphorous removal in municipal WWTPs were reviewed in the aspects of process design and operational optimization, the advances in academic studies, and the practices in engineering fields in China. 2. WWTP Processes in China 2.1. Features of Processes in WWTPs in China
%U http://www.hindawi.com/journals/ijce/2010/914159/