SBR granular sludge system Ce-Modified and Performance of the training

Title: SBR granular sludge system Ce-Modified and Performance of the training
　　Author: Xiao Naidong
　　Degree-granting units: Shandong University
　　Keywords: cerium;; carbon;; modified aerobic granular sludge;; nitrogen and phosphorus removal;; dynamics
　　Summary:
　　Rare earth element cerium has a wide range of biological effects of micro-organisms, the suitable concentration of rare earth cerium on activated sludge role in promoting the growth, to improve the sludge activity, promote sludge granulation process, to Neodymium Magnets improve the performance of granular sludge. To control eutrophication are nitrogen and phosphorus removal for the purpose of treatment research in the field today one of the hot, acetic acid and propionic acid is a larger proportion of the actual wastewater short-chain fatty acids (SCFA). In this paper, granular sludge SBR system to develop its properties as an object, in the rare earth element cerium (Ce3 +50 mg / L) conditions, respectively, using sodium acetate and sodium propionate as a separate culture of aerobic granular carbon sludge, compared to the sludge granulation process and granular sludge performance difference, explore sodium acetate, sodium propionate ratio of two different carbon sources and changes in aerobic granular sludge nitrogen and phosphorus removal performance, to further explore the rare earth elements Cerium on the effects of aerobic granular sludge, and to study the composition of the best carbon source under the cerium modified granular sludge characteristics and the cycle of reaction kinetics of anoxic denitrification and phosphorus removal, its conclusions are as follows:
　　1) granular activated sludge process of sodium acetate and sodium propionate sludge extracellular polymer content of the trend component is similar to the proportion of protein and polysaccharide showed an increasing trend, indicating that the suitable concentration of Ce3 + on different carbon sources of microbial growth all have a stimulating effect on microbial metabolites and extracellular enzyme secretion produced beneficial effects of granular sludge; propionate sludge extracellular polymer components were significantly larger than the sodium acetate, indicating that the same concentration of Ce3 + on the role of different carbon sources ability differences, C sodium acetate are more susceptible than the Ce3 + stimulation.
　　2) activated sludge process of sewage sludge particles of cerium ion content increased rapidly in the early, small fluctuations in the latter part of the experiment, indicating that the sludge on the absorption of cerium ions with a certain optimum limits; experiments in the late sodium acetate sludge cerium ion concentration higher than C in sodium cerium ion concentration in the sludge, indicating that different carbon sources on the absorption of cerium ions have different optimal values; cerium ion content of sludge and sludge extracellular polymer component content inconsistencies that different carbon sources, absorb large amount of cerium ions does not mean that the extracellular polymer component content is also large, cerium ions in the sludge of the sludge in the distribution of activity also plays an important role.
　　3) activated sludge process of wastewater pollutants in particulate removal efficiency of comparative studies show that the sodium acetate and propionate as carbon source of the sludge have good COD removal (respectively 95.5% and 96.7%), sodium acetate as carbon source of phosphorus sludge better (respectively 91.2% and 86.8%), sodium propionate as carbon source for denitrification sludge stronger (respectively 77.3% and 84.4%).
　　4) performance of studies have shown that granular sludge, granular sludge compared with sodium propionate, sodium acetate granular sludge size small (respectively, 0.4 ~ 0.6 mm and 2-5 mm), SVI small (respectively, 27.4 mL / g and 42.5 mL / g), proportion (1.069 and 1.044, respectively), moisture content is small (respectively 85.1% and 91.2%); but propionate in the hydrophobicity of granular sludge (63.2% and 68.3% respectively), and settlement speed (respectively 51.97 m / h and 86.96 m / h) has advantages.
　　5) The microstructure analysis showed that the granular sludge acetate granular sludge gathered from the filamentous form, mixed with spherical particles, bacteria-rich, dense structure. Sodium propionate granular sludge mainly by filamentous bacteria and inorganic composition of each winding, the particle surface density, smaller pores, internal hole, spores small, poor biological activity. Sodium propionate sludge denitrification biological activity and strong but short duration; effect of sodium acetate, and biological phosphorus removal sludge and strong stability.
　　6) The batch experiments show that the added sodium propionate and sodium propionate / acetate ratio increased help to improve http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets the aerobic granular sludge SBR system nitrogen and phosphorus removal performance, the best carbon source composed of sodium acetate: C sodium as 1:3 (COD ratio).
　　7) under the optimal composed of cerium modified carbon cycle response characteristics of granular sludge and anoxic denitrification and phosphorus removal kinetics results show that the composition of domesticated and stable under the best carbon source to the granular sludge COD.TN.TP addition rates were 95.8%, 82.8% and 93.8%; cerium modified aerobic granular sludge denitrification and phosphorus removal kinetic parameters νmaxNO3-= O.107 mg NO3--N/mg MLVss · d, Ks, NO3- = 0.326 mg NO3 - N / L. Ce-Modified aerobic granular sludge anoxic denitrifying phosphorus bacteria during each reduction 1mg NO3 - N average absorption 1.31mg PO4 - P.
　　Degree Year: 2010