Process characteristics of ammonia wastewater treatment by embedded immobilized nitrifying sludge
XU Xiao-yi1,2, ZHANG Ting-ting1,2, YOU Xiao-lu1,2, LÜ Chen-pei1,2
1. Key Lab of Ministry of Education for Three Gorges Reservoir Region's Eco-Environment, Chongqing University, Chongqing 400045, China; 2. National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China
Abstract：Polyvinyl alcohol (PVA) as a gel matrix was used to immobilize activated sludge with good nitrification performance. The mass transfer efficiency and nitrogen removal characteristics of immobilized particles were evaluated for different initial ammonium concentration of simulated wastewater in the sequencing batch reactor (SBR). When the package percentage of immobilized particles, water temperature, pH, and the DO concentration were 10%, 26~30℃, 7.5~8.5, and 4~5mg/L, respectively, the maximal ammonia removal load in the stable period kept at 61.8~242.3mgN/(L-particles·h) with different influent NH4+-N concentration of 50~400mg/L. The removal kinetics of ammonia nitrogen followed the zero-order reaction model, furthermore, the maximum ammonia oxidation rate (μmax) and half-saturation constant (Ks) were estimated as 271.40mgN/(L-particles·h) and 66.69mg/L, respectively. According to the diffusion experiments, the effective diffusion coefficient (De) of ammonia and oxygen in immobilized particles were calculated as 0.467×10-9m2/s and 0.279×10-9m2/s, respectively. SEM observation and the test of specific surface area showed that the specific surface area and the average pore diameter in the interior of the particles increased greatly during the stable stage compared with the fresh particles. Comprehensive comparison of three different systems including immobilized particles reactor, activated sludge reactor, and the mixing reactor with immobilized particles and activated sludge was carried out. The sludge reactor with adding immobilized particles could enhance the nitrification and nitrogen removal process significantly. Moreover, the simultaneous nitrification and denitrification also could be observed.
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