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Impact Of Lignin From Non-Wood Pulping Processes On Kraft Wastewater Treatment And Receiving Water Quality, Mohamed Hamdy Nour

Archived Theses and Dissertations

The Kraft process is typically used for pulping non-wood raw materials, I ike rice straw, in order to dissolve the non cellulose organic fraction, essentially lignin, and leave behind the fibrous residual as pulp for paper production. Rice straw, however, also contains a high percentage of silica that dissolves in the process. The wastewater derived from vacuum filtration of the pulp solution is referred to as black liquor, owing to its dark color and complex makeup with high BOD, caustic, silica, and TDS. The high silica concentration in the black liquor prohibits conventional chemical recovery due to scaling of the …