Waste minimization in a bleach plant

Doğan, Ilgın
Guruz, AG
In this study a steady-state model was developed for a six stage bleaching system in a pulp and paper industry. A FORTRAN source code was written to simulate the whole bleach plant. Different case studies were performed with the aim of decreasing the total amount of dissolved solids coming out from the six washers. Each stage of the sequence is composed of chemical additions and mixing, reaction in a retention tower, and washing. Unit operation models were formulated using mass balances on liquor, fibres, chromophores, chemicals and dissolved solids. In order to compare the simulation results with the mill data, Dalaman SEKA Pulp and Paper Mill bleaching unit was chosen. A good agreement between the simulation results and the mill data was achieved. In the case studies, the optimization of the process variables were performed in which the effects of retention tower operating temperature, residence time, consistency, bleaching liquor flow rate and the wash water flow rates in the washers were studied. Also, the effect of 100% chlorine dioxide substitution in the chlorination stage was analyzed. It was concluded that 100% chlorine dioxide substitution was the best way to decrease the amount of dissolved solids.


Anaerobic treatment of synthetic textile wastewater containing a reactive azo dye
Sen, S; Demirer, Göksel Niyazi (American Society of Civil Engineers (ASCE), 2003-07-01)
In this study, anaerobic treatment of synthetic textile wastewater containing a reactive azo dye, namely, Remazol Brilliant Violet 5R, was investigated. A fluidized bed reactor (FBR) was used in the study. Before the operation period, start-up of the FBR was completed in 128 days with an immobilized microorganism level of 0.069 g volatile suspended solids per g support material (pumice). Anaerobic treatment of synthetic textile wastewater revealed that 300 mg/L dye was removed in the FBR system. Chemical ox...
KARSH, H; Çulfaz, Ali; YUCEL, H (Elsevier BV, 1992-07-01)
Sorption properties of silicalite-1 samples of pure silica form for some parafinic and aromatic hydrocarbons of different molecular sizes were investigated. It was observed that sorption rates and apparent equilibrium capacities for critically sized molecules, m-xylene and o-xylene, depend on the sorption history of the sample. Sorption of m- and o-xylene proceeded extremely slowly on fresh samples of silicalite-1, whereas sorption rates of these molecules on silicalite-1 samples that had passed through a p...
Transformation pathways and fate of engineered nanoparticles (ENPs) in distinct interactive environmental compartments: A review
Abbas, Qumber; Yousaf, Balal; Amina, Amina; Ali, Muhammad Ubaid; Munir, Mehr Ahmed Mujtaba; El-Naggar, Ali; Rinklebe, Joerg; Naushad, Mu (Elsevier BV, 2020-05-01)
The ever increasing production and use of nano-enabled commercial products release the massive amount of engineered nanoparticles (ENPs) in the environment. An increasing number of recent studies have shown the toxic effects of ENPs on different organisms, raising concerns over the nano-pollutants behavior and fate in the various environmental compartments. After the release of ENPs in the environment, ENPs interact with various components of the environment and undergoes dynamic transformation processes. T...
Application of ozonation and biotreatment for forest industry wastewater
Balcioglu, I. Akmehmet; Sarac, C.; Kivilcimdan, C.; Tarlan, E. (Informa UK Limited, 2006-12-01)
This research is focused on the integrated process for the treatment of bleached Kraft pulp mill effluents. Pre-ozonation 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 BOD5/COD ra...
Anaerobic Digestability and Biogas Production Capacity of Pistachio Processing Wastewater in UASB Reactors
Gur, E.; Demirer, Göksel Niyazi (American Society of Civil Engineers (ASCE), 2019-08-01)
High volumes of wastewater with considerable levels of organic and phenolic compounds and solid material are produced during pistachio processing. There is not a commonly adopted treatment technology for the wastes produced during pistachio processing. The objective of this study is to evaluate the anaerobic digestability and biogas production capacity of pistachio processing wastewater in upflow anaerobic sludge blanket (UASB) reactors for the first time in the literature. The results indicated that pistac...
Citation Formats
I. Doğan and A. Guruz, “Waste minimization in a bleach plant,” ADVANCES IN ENVIRONMENTAL RESEARCH, pp. 359–369, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63257.