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Effect of Novel Media-Sludge-Fly Ash Ceramic Particles on Synthetic Wastewater Treatment in Biological Filters

Author: HanShuZuo
Tutor: YueQinYan
School: Shandong University
Course: Environmental Engineering
Keywords: Sludge Fly ash New packing Biofilter Nitrogen and phosphorus removal
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 213
Quote: 1
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Abstract

Sludge and fly ash are two common types of solid waste, and solve a lot of the way out of the sludge and fly ash has become an important issue of the relationship between human ecological environment safety and sustainable development. In this study, sludge, fly ash and clay three materials jointly prepared new filler - sludge Lytag applied to A / O integrated aeration the biofilter anaerobic biofilter two sewage treatment process focuses on discussion of the feasibility and applicability of new ceramics used in sewage treatment, the potential advantages and irreplaceable, achieve the dual purpose of comprehensive utilization of \environmental benefits, social and economic benefits. Compared with the commodity ceramisite (CCP), the sludge lytag (SFCP) having a greater total porosity and the total surface area, as well as lower bulk density and apparent density. SFCP SEM apparent morphology more rough the surface thereof, mainly distributed on the surface of large holes. Developed pore structure is very conducive to the microorganisms in the solidification of the surface of the adhesion. SFCP heavy metals leaching experiments showed all heavy metals leaching concentrations were below the threshold prescribed by the GB. Therefore, SFCP as water treatment packing is safe and feasible, will not cause secondary pollution problems in the water treatment process. The apply new filters SFCP to the A / O Integrated BAF system study to determine the optimal operating parameters of the sewage treatment: hydraulic retention time (HRT) of 2.0h, gas-water ratio (A / L) for 15:1, reflux ratio (R) is 200%. Under optimized conditions, the removal of 90% of the CODcr, NH4-N and 98% more than the nearly 70% of TN. Functional area of ??the reactor, making the CODCr, NH4-N and TN removal with packing height changes, showing a different variation. Filler SFCP with the CCP as an upflow anaerobic biological filter (AF), in order to examine SFCP used as a water treatment packing CCP's potential superiority and irreplaceable, the study results show that: AF start the steady-state operation best C / N 4.03; Under these conditions, the two reactor at different volumetric loading rates displayed total nitrogen removal of, SFCP show better run effects. Restart stage, the reactor is in the C / N is 3.5 so, nitrate complete conversion SFCP column denitrating ability is slightly inferior to the CCP column, but with the increase in C / N difference gradually disappear. Low C / N, nitrite accumulation (NA) effect is very obvious, and the obvious impact of HRT, the effect of nitrate dissimilatory reduction (DNRA) only at the beginning of the experiment, to increase its influence with the C / N the ignored; SFCP column exhibited lower cumulative effect of nitrite, and in the C / N LT; 3.5 is particularly apparent, when the C / N of about 5.0, NA effect disappears. The NA effect disappears, TN removal rate of the highest value, but by DNRA Process not reach 100%, the removal rate. The of denitrifying phosphorus phenomenon in heavy start-up phase; phosphorus uptake rate continues to increase with the increase of C / N and C / N of about 3.5 rose rapidly; C / N of about 5.0, the highest phosphorus uptake rate (55 percent); SFCP column not only demonstrate the denitrification capacity of its phosphorus removal efficiency higher than CCP column. Further, the weight startup phase microbial communities showed some layering with the packing height, and the delamination resistance of the phosphorus removal is more obvious than nitrogen; filler inlet ends 25 cm in the main distribution area of ??the biofilm with the start stage microbial community distribution characteristics consistent with the archive did not change during the microbial structure distribution within the column. Linear correlation exists in the C / N fixed in about 2.60, HRT and nitrite accumulation rate, and CCP column correlation between the two higher; by nitrate is not completely transformed, TN removal with HRT linear correlation is relatively poor; under different HRT conditions, SFCP column remains relatively stronger ability to suppress the NA effect. Transformed replacement at no additional nitrogen source, the microbial community structure of the reactor, denitrifying phosphorus removal bacteria gradually replaced by heterotrophic anaerobes; phosphorus removal efficiency was the trend of the \N gradually increased C / N gt; 30, the linear growth trend. In the anaerobic biofilter start the re-start-up phase, SFCP column in nitrogen and phosphorus removal always maintained a relatively high operating efficiency, which fully shows that, SFCP CCP has the potential superiority and irreplaceable, is a very prospects for environmental fillers.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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