Application of Ozonation and Biotreatment for Forest Industry Wastewater

Abstract

This research is focused on the integrated process for the treatment of bleached Kraft pulp mill effluents. Preozonation of softwood and hardwood combined bleaching effluents at alkaline pH resulted in 50 and 44% COD abatement, respectively. Segregation of highly polluted streams of bleaching process can be recommended to reduce the cost of treatment since the COD removal yield of CEH effluents was higher than combined bleaching effluents. Moreover, biodegradability of CEH effluents in terms of BOD 5 /COD ratio was increased from 0.16 to 0.32. Noticeable color removal was achieved by pre-ozonation of the CEH stage and combined bleaching effluents. Preozonation enhanced the performance of subsequent algal treatment in the sequential batch reactor (SBR) and activated sludge treatment. Algae have a higher ability to degrade AOX producing compounds together with a high COD removal rate. Although pre-ozonation increased the abatement rate of COD of SBR, the AOX removal rate remained constant as 87%.

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

“…Ozonation is the most frequently employed AOP in combination with biological treatment processes (Bijan and Mohseni 2005;Balcioğlu et al 2006). Pre-ozonation before biological treatment can prevent process failure and improve the purification efficiency by decreasing BOD and COD load (Tuhkanen et al 1997;Thompson et al 2001).…”

“…Ko et al (2009) also found similar results. In addition, the reduction of COD of a bleaching wastewater from a kraft pulp and paper mill was increased by more than 25% by the addition of 5 mM Fe 2+ or Mn 2+ in comparison to its ozone treatment (Balcioglu and Moral 2008).Ozonation is the most frequently employed AOP in combination with biological treatment processes (Bijan and Mohseni 2005;Balcioğlu et al 2006). Pre-ozonation before biological treatment can prevent process failure and improve the purification efficiency by decreasing BOD and COD load (Tuhkanen et al 1997;Thompson et al 2001).…”

Equation of Energy Injection to a Dielectric Barrier Discharge Reactor

“…Dielectric barrier discharge (DBD) reactors utilize electric energy to drive chemical reactions. Recent active studies involved many applications, such as the traditional ozone (O 3 ) generation [1,2] , conversion of gas phase benzene to methane [3] , partial oxidation of methane [4] , decomposition of volatile organic compounds (VOCs) [5−10] , removal of non-aqueous phase liquids from soil layers [11] , ozonation and biotreatment of forest industry wastewater [12] , treatment of skin infections, impaired microcirculation and wound healing [13] , modification of material surface [14,15] , sterilization for food and processing plants [16] , removal of nitrogen oxides (NO x ) from a gas mixture simulating exhaust gases [17] , simultaneous removal of NO x and sulphur dioxide (SO 2 ) from flue gases in a coal-combustion power plant [18] , and removal of particulate matter from diesel engine exhausts [19,20] .…”