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Biostabilisation of sludges from food industry wastewater treatment plants through composting technology

The purpose of this work was to study the possibility of producing, by composting, a stable organic matter beneficial for agricultural use.

Four composting trials were carried out with sludges from a wastewater treatment plant from a potato chips industry. This wastewater treatment plant produces two types of sludge: single sludge (SS) and sludge mixed with potato peel (SM). The sludges were mixed with structural agents [straw (S) and corrugated cardboard (CC)] in order to improve the conditions of composting process. For 60 days, they were submitted to composting methodology. Parameters such as microbial populations (namely, total thermophilic and mesophilic aerobic bacteria and filamentous eumycetes), temperature, moisture, organic matter, total nitrogen, ammonium nitrogen, nitrate, C:N ratio, pH and electrical conductivity were evaluated. The thermophilic phase was reached in three trials but only mixtures showed good conditions for composting process, what was confirmed by the higher population of total aerobic bacteria verified in these trials. The use of straw and corrugated cardboard, as structural agents, increased the thermophilic phase, which lasted for 13 and 18 days reaching a maximum temperature of 65.4 ºC and 61.1 ºC for the mixtures SS+S+CC and SM+S+CC respectively.

Copyright:	© European Compost Network ECN e.V.
Quelle:	ORBIT 2003 (Mai 2003)
Seiten:	11
Preis:	€ 0,00
Autor:	A. Cordeiro Prof. A. Cristina Cunha Queda Elizabeth da Costa N. F. de Almeida Duarte
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