Sludge Yield of Immobilized Biological System
Date Issued
2009
Date
2009
Author(s)
Hsu, Yu-Lin
Abstract
The conventional active sludge process is the most widespread used biological treatment in wastewater treatment plant, which uses microorganisms to remove the soluble organic matter effectively in water. However, the conventional active sludge process will emit a large amount of wastes and produce problems to the following treatment processes. The Immobilized biological treatment is a technology simultaneously to remove COD and ammonia nitrogen and the immobilized cell has high density mixed microbial cells, high stability and durability, low effluent suspended solids, a short start-up period and easy to restart the operation but no studies have been focus on sludge yield of immobilized biological treatment yet. Thus, this study used immobilized cell processing technology with different experiment parameter (sludge particle size, hydraulic retention time, and aeration mode) to study the sludge yield.The lab scale immobilized biological treatment process is fed by synthesis wastewater to provide COD：300 mg/L and NH3-N：25 mg/L, with different particle size of immobilized cell (1 cm and 2.5 cm), different aeration mode (continuous aeration, 1 hour aeration/1 hour non-aeration, 1 hour aeration /2 hours non-aeration) and different hydraulic retention time (6 hours and 12 hours). The SCOD removal efficiencies can reach more than 92.3% and the total nitrogen removal efficiencies approximately is situated between the rate of 22.9~64.8%. Moreover, sludge yield is low, 0.107 kg SS/kg COD, for 1 cm particle size of immobilized biological treatment with continuous aeration (10 L/min) and 12 hour hydraulic retention time, the rest were between 0.11~0.275 kg SS/kg COD. As for the high COD concentration of synthesis wastewater (COD：1000 mg/L, NH3-N： 25 mg/L) with the continuous aeration mode and 12 hour hydraulic retention time carries continuously a week of experimental aspect, the results show that the average COD removal efficiency is 94.6% and total nitrogen removal rate is approximately above 99.6%. In addition, the sludge yield of 1 cm particle size is 0.27 kg SS/kg COD, and 2.5 cm particle size is 0.27 kg SS/kg COD.n the other hand, this research also adopts food industrial wastewater which concentrates 773 mg/L of TCOD, 556 mg/L of SCOD, 13.2 mg/L of NH3-N, 1.3 mg/L of NO3-N with the continuous aeration mode and 12 hour hydraulic retention time carries continuously a week of experiment aspects, the results show that the average COD removal efficiency is 89.4% and the total nitrogen removal rate can reach more than 95.9%. The sludge yield of 1 cm particle size is 0.018 kg SS/kg COD and 2.5 cm particle size is 0.047 kg SS/kg COD.
Subjects
Immolilized cell
Immobilized Biological System
Sludge yield
Type
thesis
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