Abstract
The main problem occurring during poultry and animal production is the management of waste generated in slaughterhouses and poultry processing plants. These wastes, due to the bacteriological threat and the difficulty in storage, adversely affect all elements of the environment and thus require quick neutralization. The prospective method of liquidation of this type of waste is thermohydrolysis in near-critical water. The aim of the work was to examine the decomposition of poultry waste, i.e. waste blood, soft tissues, chicken heads, feathers, subjected to the process of thermohydrolysis in near-critical water. The decomposition process was carried out at a pressure of 10 MPa in the temperature range of 120°C - 250°C and with a variable residence time in the reactor. Detailed analysis of the results allowed us to state that the longer the residence time in the reactor, the higher the content of soluble organic compounds in the liquid phase. The beneficial effect of applying the thermohydrolysis process on the increased reduction of organic substances present in the investigated wastes was also demonstrated.
Highlights
The decomposition process was carried out at a pressure of 10 MPa in the temperature range of 120°C-250°C and with residence time in the reactor equal to 30 minutes
The paper presents the results of research on the process of near-critical water thermohydrolysis as a method of neutralizing waste from the poultry industry
As a result of the analyses, it was found that the process of thermohydrolysis of poultry waste depends primarily on the temperature and residence time in the reactor
Summary
The decomposition process was carried out at a pressure of 10 MPa in the temperature range of 120°C-250°C and with residence time in the reactor equal to 30 minutes. The tested samples were analyzed for the content of total organic carbon (TOC) and chemical oxygen demand (COD) in the suspension. TOC was determined by a coulometric method using a Strohlein 702Li/C Coulomat, and the determination of COD was carried out using the dichromate method according to PN-ISO 6060:2006. The method consisted in determining the mass of potassium dichromate in milligrams in terms of oxygen used for oxidation of organic compounds and some inorganic substances present in the analyzed sample
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