The influence of the high and low molecular weight fractions of a bleach kraft mill effluent on the microbial activity of activated sludge |
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| Affiliation: | 1. Key Laboratory of Aquaculture and Ecology of Coastal pool in Jiangsu Province, Department of Ocean Technology, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China;2. Key Open Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology Certificated by the Ministry of Agriculture, Wuxi College of Fisheries of Nanjing Agriculture University, Wuxi 214081, Jiangsu, China;1. Biometeorology and Soil Physics Group, University of British Columbia, Vancouver, Canada;2. Canadian Forest Service, Northern Forestry Center, Edmonton, Canada;1. Post-graduation Program in Agriculture and Biodiversity, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brazil;2. Post-graduation Program in Forest Engineering – Universidade Federal do Paraná, Campus Jardim Botânico, Curitiba, Brazil;3. Department of Forest Sciences, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brazil;4. Department of Engineer Agronomy, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brazil;5. Department of Agriculture Engineering, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brazil;6. Forest Engineer, Brazil;1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, CAS, 830011 Urumqi, China;2. Cele National Station of Observation and Research for Desert-Grassland Ecosystems, 848300 Cele, China;3. Department of Applied Plant Science, Chonnam National University, 500757 Gwangju, South Korea;4. Department of Ecosystem Physiology, University of Freiburg, 79085 Freiburg, Germany;5. Department of Plant Ecology, BayCEER, University of Bayreuth, 95447 Bayreuth, Germany;1. School of Civil Engineering, Shandong University, Jinan, Shandong 250061, China;2. Xi’an Research Institute Company of China Coal Technology and Engineering Group, Xi’an, Shaanxi 710077, China;1. Aquanty Inc., 564 Weber St. N., Unit 2, Waterloo, ON N2L5C6, Canada;2. Dept. of Geography and Environmental Management, University of Waterloo, Waterloo, ON N2L 3G1, Canada |
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| Abstract: | The high molecular weight (HMW) fraction (> 1000 Da) of bleached kraft mill effluent (BKME) is the principal source of adsorbable organic halide (AOX), colour and chemical oxygen demand in treated effluent. The influence of HMW material on the microbial activity of activated sludge microorganisms was studied in a series of batch growth experiments using fractionated effluent. The HMW material in the untreated effluent comprised 80% of the AOX but only 20% of the soluble COD. Multivalent metal ions had a greater affinity for this HMW fraction. The addition of HMW material to the LMW fraction had a stimulatory effect on microbial activity as measured by increases in biomass and substrate utilization. Chemical characterization and subsequent growth experiments revealed that nitrogen, which was deficient in the LMW effluent, was primarily associated with the HMW material. The association of nitrogen with the HMW fraction may have an important role on the behaviour of nitrogen within a biological treatment system and in the receiving environment. |
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