Composting of Sewage Sludge with a Simple Aeration Method and its Utilization as a Soil Fertilizer

Thanh Binh Nguyen, Kazuto Shima

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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 (ø 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.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalEnvironmental Management
DOIs
Publication statusAccepted/In press - Feb 2 2018

Fingerprint

Sewage aeration
Composting
Sewage sludge
Fertilizers
composting
compost
aeration
fertilizer
Soils
Amino acids
amino acid
Nitrogen
Raw materials
Biomass
soil
ammonification
Plywood
Nitrification
nitrogen
biomass

Keywords

  • Amino acid
  • Biodegradation
  • Composting
  • Nitrogen
  • Sewage sludge

ASJC Scopus subject areas

  • Global and Planetary Change
  • Ecology
  • Pollution

Cite this

Composting of Sewage Sludge with a Simple Aeration Method and its Utilization as a Soil Fertilizer. / Nguyen, Thanh Binh; Shima, Kazuto.

In: Environmental Management, 02.02.2018, p. 1-11.

Research output: Contribution to journalArticle

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