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Combination of aerobic granular sludge metabolic petrochemical wastewater treatment

Author: HeYinLi
Tutor: ZhangHanMin
School: Dalian University of Technology
Course: Environmental Engineering
Keywords: Aerobic granular Petrochemical wastewater Cometabolic Airlift loop batch reactor
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 145
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Abstract

This study used a batch airlift loop reactor (SBAR), gradual domestication and utilization of metabolic method of aerobic granular sludge wastewater treatment petrochemical launched a study to examine aerobic granular sludge performance of petrochemical wastewater explore the aerobic granular structure and other characteristics of the active and seek aerobic granular sludge petrochemical wastewater suitable ways and methods. Experiment was divided into training and aerobic granular sludge particles petrochemical wastewater sludge treatment in two stages. A total of 97 days running stage to simulate water as water, successfully cultured granular sludge with good stability, while its stability, physical properties, such as pollutant removal performance were studied. Phase two of running 126 days, from the beginning stages of petrochemical wastewater gradually added to the influent concentration gradually increased to 100%, and examines the performance of aerobic granular sludge treatment of pollutants, operation stability, and water petrochemical wastewater present case, granular sludge biological activity, morphological and structural changes. In addition, in the experimental stage, in order to study metabolism of aerobic granular sludge and common petrochemical wastewater treatment combined effect of sodium propionate selected as co-substrate added to the water in order to promote the role of co-metabolism occurs. Through a series of experiments analysis, this study cultured aerobic granular slow growth rate, after 97 days of culture, the average particle size increased only from 0.06 mm to 0.49 mm, probable cause is organic loading rate (OLR) is low . In addition, the petrochemical wastewater on aerobic granular characteristics of large petrochemical wastewater is added after the micro-granular sludge composition becomes gradually from bacilli and cocci Brevibacterium, and with a higher proportion of petrochemical wastewater added, extracellular polymeric substances ( EPS) content increased from 50.2 mg / gMLSS down to 20.4 mg / gMLSS. 100% of the influent wastewater and not add additional petrochemical carbon source, a sharp particle settling performance deteriorated, COD and NH4-N removal efficiency also decreased significantly. However, as a co-substrate added sodium propionate EPS content again after upgrading, and ultimately increased 40.5mg/gMLSS, particles in the sludge volume index (SVI), mixed liquor volatile suspended solids (MLVSS) and other aspects reflect stable trend, and COD, NH4-N and total nitrogen (TN), the average removal rates reached 89%, 94% and 67%. Experimental results show that the right of aerobic granular matrix can provide good nutrition. This study selected sodium propionate as a co-substrate provided sufficient carbon source for the microorganisms, is conducive to the survival and growth of aerobic granules. Relative to the domestication method to add additional co-metabolism of substrates to run, is to maintain the granular sludge dense structure and better treatment of petrochemical wastewater a more effective method.

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