See below residues from pulp production that
are treated and reused by Iguaçu Celulose:

Lime Mud
Defined moisture content and calcium-carbonate rich, this residue can be recycled as calcitic soil amendment. Under an agriculture engineer’s supervision, it can be used in magnesium-rich soil preparation for planting soybeans, beans, coverage, corn, and eucalyptus as well as for fruit farming. It is registered at the Agriculture Ministry as calcitic soil amendment and it is also a filler, with a neutralizing power above others, reaching over 95% of PN, working fast in the soil.

Sludge from Effluent Treatment Stations
Resulting from the biologic decomposition of industrial liquid residues, this sludge is especially rich in organic matter. It is easily handled after pressing and is made into humus when in contact with worms, a product widely in gardening and farming; it is also used in the composition chain of substrate for seedling nursery. It is a major agent for structuring and keeping soil moisture, it has high nitrogen and phosphorous content and can be used as organic fertilizer for a better vegetation nutrition. The sludge (dry base) contains about 50% of organic matter, 16% of nitrogen and 1.5% of phosphorous, with a pH of about 6.0.

Boiler Ash
This residue comes from burning of boilers producing vapor; it is used in composting, also as a substrate component used in seedling nursery and as raw material in the manufacturing of activated carbon and as a cement pozzolanic agent. It is also used in the pre-molding industry and in recovering degraded areas. Its composition reaches 60% of organic matter, 2.6% of potassio and calcium, with alkaline pH and micronutrients.

Pine Bark
It is used as biomass in vapor generation boilers, in composting and as a component in substrate for seedling nurseries. The decomposed material has about 35% of organic matter in addition to macro and micronutrients.

Soap
Resin from the wood cooking process, separated from black liqueur during evaporation/washing. Used in tall oil production.