4 research outputs found
The advanced application of the wood-originated wastewater sludge
The wood hydrothermal treatment is one of the plywood production’s stages, which
resulting in the production of wastewater containing such components as hemicelluloses, lignin
and wood extractive substances (HLES). It is necessary to improve the wastewater treatment
technology with the aim to enhance the yield of sludge from plywood wastewater for its effective
and rational recycling. In the present study, the optimal coagulation conditions for the HLES
removal have been found using the developed aluminium salt-based coagulant. The developed
composite coagulant is characterized by lower doses, a wide range of the work pH values, the
insensitivity against temperature changes and a higher coagulation efficacy compared with
traditional aluminium salts. The proposed treatment technology generates many tons of woodoriginated sludge – a biomass coagulate. It was found that the formed coagulate produced in the
process of wastewater treatment can increase the sorption ability of clay. The optimal content of
the dry coagulate in a clay sorbent does not exceed 0.11%. The sorption capacity of the developed
sorbent for water, rapeseed and silicone oil increases by 35%, 31% and 21%, respectively, relative
to the unmodified clay sorbent. The sorption efficiency of heavy metals from water solutions is
also increased by 10–12%. The thermal treatment of the modified clay sorbent at the high
temperature leads to an increase in its sorption capacity for oil products
Wood Processing By-Products Treated with the Lignin-Based Conditioner as Mulch for Land Protection
Wood processing by-products such as bark of different wood species and hydrolysis lignin were applied as soil mulch. The lignin-based soil conditioner (LSC) representing a lignin-based polyelectrolyte complex with the different composition (a lignin/polymer mass ratio) was obtained under laboratory conditions and was intended to protect sandy soil from erosion by simultaneous application of a soil conditioner as an adhesive, mulch and plant seeds by hydroseeding. The study revealed the pronounced dependence of the properties of the treated wood-originated mulch on the wood species as well as on the composition, the applied concentration and the application rate of LSC. A comparison of the obtained results showed that the treated hydrolysis lignin was characterised by higher compressive strength, higher water resistance and lower moisture losses from sandy soil for a given LSC composition and application rate than the bark-based mulch. The conditioner concentrations don't have negative impact on the germination of seeds plants of the coastal dune zone