Anaerobic Solutions for Pulp and Paper Industrial

Wastewaters are typically generated during the bleaching of paper derived from eucalyptus or pine pulp and normally contain medium to high concentration levels of COD and low levels of BOD5. This is due to the significant presence of recalcitrant compounds in these polluted liquids.

The underlying characteristics of these wastewaters and the level of compounds they contain depend largely on the particular processes in the bleaching (for example ECF — Elemental Chlorine Free or TCF — Total Chlorine Free).

Industrial wastewaters which come from the ECF process will contain large quantities of organic-chloride compounds (AOX — Adsorbable Organic Halogen), which require significant care for being treated and disposed.

Where this process is used, BIOTECS would typically suggest BIOTECS AnUp↑-C-Series as an alternative among anaerobic reactors, where the anaerobic process must be preceded and followed by an efficient solids removal system and a tertiary process to remove general solids and recalcitrant compounds, color and turbidity, respectively, presents in the raw wastewaters.

For the TCF process, where the bleaching typically involves the use of hydrogen peroxide (in addition to other substances), BIOTECS would suggest the use of either BIOTECS AnUp↑-SB, AnUp↑-SB+ or BIOTECS AnUp↑-C-Series anaerobic reactors or even BIOTHOL, depending on the volume of the organic load to be trea-ted. These would also be preceded and followed by other treatment phases, as required.

In some cases where required, BIOTECS could also recommend the installation of aerobic processes either on their own or in combination with anaerobic systems, depending on the requirements for the effluent.