Utilization of Sewage Sludge From Acid Casein Production for Soil Fertilization

Abstract

Organic biodegradable waste composes a fair part of farm and vital activity waste. The disposal of this waste in municipal waste landfills pollutes the environment and soil. Therefore, the European Union and other countries look for alternatives to manage biodegraded waste. This paper seeks to analyse the properties of sludge that forms in the sewage treatment plants of the acid casein production, examines experience in managing and applying sludge. The results of an experiment show that sewage sludge from the acid casein production is suitable as a soil fertilizer for growing lettuce (Lactuca sativa L.) and garden cress (Lepidium sativum L.). After soil was fertilized with this sludge, the germination of lettuce and garden cress as well as the biomass of experimental alimentary plants increased. A suitable ratio of soil and sludge mixture was determined (for lettuce ‐ 1:1, for garden cress ‐ 3:1). Potassium sulphate which was added to a soil‐sludge mixture improved the values of fertility parameters of alimentary plants.

Amoniako ir metano dujų, išsiskiriančių kompostuojant nuotekų dumblą, tyrimai

“…Natūraliai aeracijai pagerinti į dumblą pridedama priedų (medienos pjuvenų, skiedrų ir kt.) (Zuokaitė, Ščupakas 2007).…”

Experimental Investigation of Biogas Production Using Fatty Waste/Biodujų Gamybos Eksperimentiniai Tyrimai Panaudojant Riebalines Atliekas/Экспериментальные Исследования Производства Биогаза C Использованием Жировых Отходов

“…Waste water treatment plants and poultry farms generate nearly the largest amounts of organic waste. The generated manure, slurry and sewage sludge produce unpleasant odours (Zuokaitė, Ščupakas 2007). When applying slurry on soil, there emerges an excess of nutrients and part of sewage can penetrate into ground waters.…”