Abstract
Wastewater from food processing enterprises are highly polluted. These include pollution of both organic origin and mineral inclusions and detergents. This fact necessitates their preliminary treatment before discharge to biological treatment plants. Most enterprises in the industry use reagent pressure flotation for cleaning.One of the most important aspects of high cleaning efficiency is the correct selection of reagents for treatment. However, due to the high heterogeneity of the wastewater of various enterprises, this task is becoming a quit difficult. So, the wrong selection of the coagulant and its dose can lead to the installation of inappropriate equipment at the enterprise. At the same time, the equipment of a reagent farm can be either insufficient productivity or overstated performance. Both of that will not allow to achieve the required treatment effect and will entail the discharge of untreated sewage into the water reservation.There are 6 operating enterprises which specializing in the production of poultry meat are considered in this paper. Considered enterprises operate on the same technology and produce identical products. At the same time, the wastewater of these enterprises is significantly different in composition. Concentration of suspended solids varies from 450 to 3500 mg/l, COD values from 1000 to 8400 mg/l, and BOD5 from 600 to 3000 mg/l. There are coagulation thresholds are determined for each of the studied enterprises. Obtained results are summarized in graphs depicting the effect of initial effluent concentrations on the coagulation threshold of each of the studied samples. Obtained results are summarized in graphs were constructed and curve equations that describe changes in the coagulant dose with a change in the concentration of contaminants in the initial effluent were proposed. Obtained equations can be used for predicting required dose of aluminum polyoxychloride coagulate for wastewater with known concentration of suspended solids, COD or BOD5. This information can be used at the design stages of new local treatment plants of poultry meat processing sewage, and during the technical re-equipment of treatment plants.
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