P. Solyom et al., BIOLOGICAL AND CHEMICAL CHARACTERIZATION OF AN EFFLUENT FROM PRODUCTION OF DEINKED PULP AND TISSUE, Paperi ja puu, 77(4), 1995, pp. 209-214
The effluent from deinking of high-yield pulp-based newsprint and tiss
ue production exhibited slight toxicity to bioluminescent bacteria, a
green alga and fish. The toxicities are expressed in toxic units (TU)
that are in the range of 1.1 to 2. These values are also applicable to
chronic toxicity for fish and sublethal effects such as the sensitivi
ty of offsprings from parent fish preexposed for the effluent. The org
anic content of the effluent was biologically degradable to ca. 70% ba
sed on COD and TOC. The biologically stabilised effluent was non-toxic
to the organisms assayed. The residual organic matter of the stabilis
ed effluent contained mostly fatty acids in concentrations comparable
to those in the raw water used in production. The daily discharge of p
otentially bioaccumulative organic matter from the production amounted
to about 6.2 kg, while the river water from which the raw water is ta
ken and which enters the same recipient as the effluent, transports ab
out 1,700 kg per day.