Characteristics of rice straw and sewage sludge as composting materials in Valencia (Spain)

Iranzo, Marı́a; Cañizares, J. V.; Roca-Pérez, Luís; Sainz-Pardo, Isabel; Mormeneo, Salvador; Boluda, Rafael

doi:10.1016/j.biortech.2004.01.013

Cited by 65 publications

(41 citation statements)

References 10 publications

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“…Huang et al [12] concluded that co-composting of pig manure with sawdust at a low initial C/N ratio would require a longer composting period to reach maturity. In a similar study conducted on sewage sludges and rice straw, Iranzo et al [23] observed that a low C/N ratio induces a higher oxygen consumption than other larger ratios. Such behaviour was attributed to the fact that a low C/N ratio increased the microorganisms' growth and provided a better homogeneity of mixture and consequently a greater microbiological activity.…”

Section: Electrical Conductivitymentioning

confidence: 94%

“…[13] However, in the case of sewage sludges based mixtures several studies report a low initial C/N ratio and a reduced change in this parameter during the process in agreement with our results. [15,18,20,23] Several studies have been conducted in order to verify the effect of the initial C/N ratio on the composting process by using different compositions of starting materials. Eiland et al [24] observed that low initial C/N ratios caused a fast degradation of fibres during the first three months of composting of straw and pig manure (hemicellulose: 50-80%, cellulose: 40-60%).…”

Section: Electrical Conductivitymentioning

confidence: 99%

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Changes in chemical and biological parameters during co-composting of anaerobically digested sewage sludges with lignocellulosic material

Nègre

Monterumici

Vindrola

et al. 2011

Journal of Environmental Science and Health, Part A

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This study reports a pilot experiment of composting of anaerobically digested sewage sludges deriving from the production of biogas in a wastewater treatment plant. Two composting piles (about 15 m 3 each) were prepared by mixing 50% and 30% sludges with lignocellulosic material. The composting process was monitored through determination of the main physico-chemical properties. The maturity of the composts was assessed by determination of the respiration index and dehydrogenase activity. The data indicated that, at both sludges concentrations, the process produced a final compost suitable for agricultural applications. The germination and growth indexes of Lepidium sativum indicated the lack of phytotoxicity of the final materials. The suitability of the final product as a field improver and horticultural substrate has been attested through bioassays conducted on maize and chrysanthemum.

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Section: Electrical Conductivitymentioning

confidence: 94%

Section: Electrical Conductivitymentioning

confidence: 99%

Changes in chemical and biological parameters during co-composting of anaerobically digested sewage sludges with lignocellulosic material

Nègre

Monterumici

Vindrola

et al. 2011

Journal of Environmental Science and Health, Part A

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“…Immobilization of N on direct incorporation of rice straw in soil is caused due to its wide C:N ratio and therefore, composting is a preferred method of straw disposal (Banger et al 1989, Goyal et al 2005. In order to hasten decomposition the initial C:N ratio of the straw can be narrowed down by addition of fertilizer nitrogen or nitrogen-rich organic wastes such as poultry manure or sewage sludge low in heavy metals and hazardous organic compounds (Ranalli et al 2001, Iranzo et al 2004). Enrichment of compost raw material with rock phosphate before composting to increase the P content is a viable option to meet P requirement of crops (Banger et al 1989, Manna and Ganguli 1998, Biswas and Narayanasamy 2002.…”

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confidence: 99%

Identification of organic acids produced during rice straw decomposition and their role in rock phosphate solubilization

Kumari¹,

Kapoor²,

Kundu³

2008

Plant Soil Environ.

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The production of organic acids and changes during decomposition of rice straw amended with tricalcium phosphate (TCP) and Udaipur rock phosphate (URP) were studied under laboratory conditions. The organic C content of rice straw decreased and total N increased with time, resulting in a decrease in C:N ratio as the decomposition progressed. The pH decreased to acidic range in all the treatments on day 15, but became alkaline again later on. Soluble P increased at 15 days after incubation, declined later during decomposition, and was highest in the treatments containing TCP and Aspergillus awamori inoculation. Citric, oxalic, formic and maleic acids were detected during decomposition of rice straw and maximum amounts were present on day 15. Citric and oxalic acids were responsible mainly for P solubilization from TCP and URP; generally, citric acid was the most effective in P solubilization.

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“…These materials may be used as regulatory BAs to balance the moisture contents of the sludge and increase its porosity to permit airflow. In addition, these materials may be used to balance the C/N ratio and provide additional carbon for improve the microbial activity (Diaz et al, 1993;Haug, 1993;Iranzo et al, 2004;Tremier et al, 2005;Mohajer et al, 2009;Huet et al 2012). Supplementation of bulking agents can also provide optimum free air space (FAS) and void dispersion in composting (Iqbal et al, 2010), which permit adequate water and gas exchange between gas and solid phases, and prevent excessive compaction of the composting materials (Kulcu and Yaldiz, 2007).…”

Section: Introductionmentioning

confidence: 99%

Composting of wastewater treatment sludge with different bulking agents

Uçaroğlu

Alkan

2015

Journal of the Air & Waste Management Association

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The main objectives of this study were to investigate the compostability of wastewater treatment sludge (WTS) containing different bulking agents (BAs) and to determine the most efficient BA. Four different compost trials consisting of mixtures of wheat straw (WS), plane leaf (PL), corncob (CC) and sunflower stalk (SS) with WTS were performed in laboratory reactors. In all experiments, a mixture of 60% WTS and 40% BA (wet basis) was used. The temperature, dry matter (DM), organic matter (OM), pH, electrical conductivity (EC) and C/N ratio were monitored during the composting process. Evaluation of the operational parameters showed that the highest organic matter degradation (i.e. 37.6%), loss of dry matter (i.e. 29.6%) and temperature (i.e. 64°C) were achieved for the WTS-CC mixtures. Results also showed that the WTS-SS mixture was also successful in terms of these operational parameters. Use of bulking agents for the treatment of wastewater treatment sludge in composting process is an important issue with regards to process efficiency, economy and disposal of agricultural waste. Corncob and sunflower stalk that were previously not used for the composting of WTS from food industry were shown to be highly successful BA materials in this study.Implications: The compostability of wastewater treatment sludge from the food industry with different bulking agents was studied. Wheat straw, plane leaf, corncob, and sunflower stalk were used as bulking agents. The required microbial stabilization and degree of mineralization were achieved with corncobs and sunflower stalks. PAPER HISTORY

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Characteristics of rice straw and sewage sludge as composting materials in Valencia (Spain)

Cited by 65 publications

References 10 publications

Changes in chemical and biological parameters during co-composting of anaerobically digested sewage sludges with lignocellulosic material

Changes in chemical and biological parameters during co-composting of anaerobically digested sewage sludges with lignocellulosic material

Identification of organic acids produced during rice straw decomposition and their role in rock phosphate solubilization

Composting of wastewater treatment sludge with different bulking agents

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