Received: February 13th, 2021 ; Accepted: May 2nd, 2021 ; Published: August 18th, 2021 ; Correspondence: [email protected] aim of the study was to develop a new Al-based hybrid coagulant that was effective
in removing wood biomass from the wastewater formed in water basins of plywood plants during
hydrothermal treatment of birch wood. The organic-inorganic coagulant was prepared by
interaction of high molecular polyethyleneimine (PEI) with the inorganic polyaluminium
chloride-based composite coagulant (KHPAC) in aqueous medium. Owing to the hybrid nature,
the developed coagulant could simultaneously perform both the coagulation and flocculation
function. The influence of a hybrid coagulant composition, its dosage, pH and a temperature on
the efficiency of wastewater biomass separation was investigated. The best coagulationflocculation efficiency was achieved with the hybrid coagulant having a mass ratio of
PEI/KHPAC equal to 0.3–0.5 and at the optimal dosage of 70–80 mg L
-1
, reaching 97% yield of
the total wood biomass and 60% yield of the lignin recovery. The efficient dosage of PEI and
KHPAC in hybrid coagulant was about 1.4–1.8 and 1.7–2.2 times lower than if these
coagulants/flocculants were used alone. As a result of the coagulation-flocculation process, wood
biomass sludge is formed, which is a sufficiently large source of renewable organic matter, with
the potential to obtain value-added products. The components of the biomass sludge were found
to have surface activity and binder properties, as well as cation exchange capacity. Based on these
properties, its ability to structure dusty soil particles with the formation of mechanically resistant
soil aggregates was studied
