AVALIAÇÃO DO VOLUME, PESO E RELAÇÃO C/N RESULTANTE DA COMPOSTAGEM DE LODO DE ESGOTO ASSOCIADO A DIFERENTES RESÍDUOS

Abstract

Agroindustry demands a lot of care, especially in relation to waste generated in the processing stages. Composting is a simple technique considered ideal for recycling organic waste from agribusinesses, having characteristics that can add environmental and economic value to the process, reducing negative environmental impacts caused by waste disposal. The objective of this work was to evaluate the variation of volume, weight and C / N ratio of dairy sludge resulting from composting combined with different residues. In the experiment the composting process was carried out, combining four types of waste generated in the industry itself (sewage sludge, cattle manure, grass pruning and boiler ash) in proportions in order to present carbon / nitrogen ratio that provided adequate decomposition waste. The evaluated treatments consisted of pure sewage sludge (T1) and mixtures of sludge with other residues, being (T2) sludge + manure; (T3) sludge + ash; (T4) sludge + gram; (T5) sludge + gram + ash; (T6) sludge + dung + ash and (T7) sludge + grass + dung + ash. A randomized factorial arrangement was used, with seven treatments and three repetitions. Composting has proved to be an efficient method for treating sludge produced in a dairy effluent treatment plant. The addition of grass pruning remains to the sewage sludge (Treatment 4) in the composting process provided the largest weight and volume reductions, adequate pH, moisture content and C / N ratio.