Analysis of the long-term operation mechanism of MPSR sludge-free discharge system
LI Qing-zhe1, BIAN De-jun1,2, NIE Ze-bing1,2, ZHENG Shao-jie1, WANG Fan1, AI Sheng-shu1, ZHU Sui-yi1,2
1. Jilin Provincial Key Laboratory of Municipal Wastewater Treatment, Changchun Institute of Technology, Changchun 130012, China; 2. Science and Technology Innovation Center for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun 130117, China
Abstract：In response to the increasingly prominent problems of large residual sludge output and difficult disposal, the experiment used a micro-pressure swirl reactor (MPSR) to treat sewage in a sludge-free discharge mode. MPSR had an effective volume of 36L and ran in batch mode. The operating parameters were aeration rate of 0.14m3·h-1, drainage ratio of 50%, operation period of 12h, and the inlet temperature was (20±1)℃, continuous operation for 225d. The experimental results showed that MPSR had a good pollutant removal effect, the average removal rates of COD, TP, NH4+-N, and TN reached 85%, 95%, 95%, and 75%, respectively. During the operation, the stability of SVI, microscopic examination and the substantial reduction of EPS showed that the system did not have filamentous bacteria and extracellular polymer secretions, which ensured that the sludge still had high-efficiency settling viscosity conditions under the large increase of sludge-free MLSS. High-throughput sequencing analysis showed that the system had high stability and higher abundance of nitrogen and phosphorus removal in the stable period, which ensured the long term sequential batch operation of the sludge-free MPSR system and the high efficiency of pollutant degradation.
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