The coagulation treatment method is widely used for the effluents of various origins treatment. Substances-coagulants disrupt colloidal formations and contribute to the small particles aggregation, which leads to their precipitation and, as a consequence, a decrease in the organic substances content and the solution turbidity. The most widely used for this purpose are coagulants based on iron and aluminum. The Hermetia illucens insect is increasingly used to obtain chemical raw materials and valuable feed products for the poultry and fish cultivation. Production processes generate effluents contaminated with biodegradable substances, including components of larval fat. In this work, it was studied the coagulation purification possibility of fat-containing effluents from the production of lipid concentrate from the Hermetia illucens fly larvae by a coagulating suspension obtained from the electric arc steel-making furnaces dust, together with a co-coagulant – chestnut leaves carbonized at 400° C, which were used to increase the number of coagulation centers in the system.
The use of a coagulating suspension in the purification of model emulsions gives a low clarification effect (49% with the addition of 0.2 cm3 per 100 cm3 of the emulsion). It was found that the addition of finely dispersed carbon-ized leaves can significantly increase the cleaning efficiency. The best result was obtained by adding the carbonized chestnut leaves in an amount of 0.3 g together with 0.2 cm3 of suspension per 100 cm3 of liquid, while the clarification efficiency of the lipid concentrate model emulsion was 98%, at a pH of 8.
The main stage of coagulation occurs in the first 40 minutes of interaction, after which no changes are observed in the state of the system under study.