Operational factors and nutrient effects on activated sludge treatment of Pinus radiata kraft mill wastewater

• Published in: Bioresource technology Vol. 83; no. 2; pp. 131 - 138
• Main Authors: Diez, M.C, Castillo, G, Aguilar, L, Vidal, G, Mora, M.L
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.06.2002; Elsevier Science
• Subjects: Activated sludge; biochemical oxygen demand; biodegradability; Biological and medical sciences; Biological treatment of sewage sludges and wastes; Bioreactors; Biotechnology; Biotechnology - methods; Bleached kraft mill; Chemical oxygen demand; Daphnia; Effluent treatment; Environment and pollution; Fundamental and applied biological sciences. Psychology; Hydraulic retention time; Hydrogen-Ion Concentration; Industrial applications and implications. Economical aspects; Industrial Waste; Kraft process; lignin; nitrogen; Nutrient requirement; Oxygen - metabolism; Paper and pulp mills; pH effects; Phenol - chemistry; Phenolic compounds; phosphorus; Pinus; Pinus radiata; Sewage - chemistry; Sewage - microbiology; Time Factors; Toxicity; Waste Disposal, Fluid; wastewater; Wastewater treatment; Activated sludge; Nutrient requirement; Toxicity; Effluent treatment; Hydraulic retention time; Phenolic compounds; Bleached kraft mill; Lignin; Biodegradability; Cladocera; Nitrogen addition; Pinus radiata; Retention time; Biological purification; Crustacea; Tannin; Kraft paper; Chemical oxygen demand; Softwood forest tree; Gymnospermae; Daphnia; Branchiopoda; Interelement effect; Paper mill; Phosphorus addition; Industrial waste water; Arthropoda; Biological oxygen demand; Liquid effluent; Phenols; Coniferales; Spermatophyta; Invertebrata; Waste water purification
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/S0960-8524(01)00204-8

The biodegradability of Pinus radiata bleached kraft mill wastewater by an activated sludge treatment during a period of 280 days was evaluated. The effect of varying hydraulic retention time (HRT) in the range of 48 to 4.5 h and nitrogen (N) and phosphorus (P) addition on removal of biological oxygen demand (BOD 5), chemical oxygen demand (COD), suspended solids (TSS and VSS), total phenolic compounds, tannin and lignin and reduction of toxicity was investigated. Removal of BOD 5 was higher than 90% when HRT varied from 16 to 6 h, but decreased when HRT was less than 6 h. Similar performance was observed for COD removal, which was about 60% when HRT was varied from 16 to 6 h. Removal of total phenolic compounds and tannin and lignin was seriously affected by HRT. N and P addition to maintaining a ratio of 100:5:0.3 provided optimal BOD 5, COD and suspended solids removal when HRT varied from 16 to 7 h, and no toxicity (using Daphnia) was detected in the treated effluent. When HRT was less than 6 h, the system showed destabilisation and pH, COD, BOD 5 and suspended solids removal decreased.