Composting of Sewage Sludge with a Simple Aeration Method and its Utilization as a Soil Fertilizer
| Autor: | Kazuto Shima, Thanh Binh Nguyen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Global and Planetary Change
010504 meteorology & atmospheric sciences Ecology Sewage Compost Nitrogen Composting Biomass 010501 environmental sciences engineering.material Biodegradation Pulp and paper industry 01 natural sciences Pollution Soil engineering Environmental science Nitrification Woodchips Fertilizer Aeration Fertilizers Sludge 0105 earth and related environmental sciences |
| Zdroj: | Environmental management. 63(4) |
| ISSN: | 1432-1009 |
| Popis: | The objective of this study was to examine the feasibility of sewage sludge composting using a simple aeration method. Two consecutive composting trials (run A and run B) using Japanese sludge and woodchips (1:1, v/v) were conducted in cubic boxes (0.45 × 0.45 × 0.45 m3) made by plywood at Okayama University. Air was forced up through small holes perforated on two open-ended parallel PVC pipes (o 16 mm, 0.25 m apart) laid at the base. The results show that compost temperatures were rapidly increased to the peak points of 47.4 °C (run A) and 74.8 °C (run B) within the first 2–3 days and varied depending on each composting run and vertical locations. The changes in physicochemical properties with particular attention to inorganic nitrogen (NH4–N, NO3–N) and free amino acid nitrogen (FAA-N) indicated that the biodegradation took place by different mineralization pathways during the composting process. The degradation of organic matter into amino acids followed by ammonification was predominant in run B, whereas the nitrification was greater in run A. A pot experiment using the two finished composts and their raw materials was carried out to study their effectiveness as fertilizer to Komatsuna (Brassica rapa var. perviridis). The total plant biomass produced by the composts was similar to chemical fertilizer. The lowering proportions of FAA-N/T-N, NH4–N/NO3–N, and C/N ratios in the composts compared to those in raw materials was found to correlate with the increase in plant biomass. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink