Anaerobic Co-digestion of Urban Sewage Sludge with Agricultural Biomass
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ORIGINAL PAPER
Anaerobic Co‑digestion of Urban Sewage Sludge with Agricultural Biomass Pengfei Li1 · Chao He2 · Ran Yu1 · Dekui Shen1 · Youzhou Jiao2 Received: 15 July 2019 / Accepted: 28 October 2019 © Springer Nature B.V. 2019
Abstract Three different types of urban sewage sludges (the mixed sludge, the dewatered secondary sludge and the sludge filtered by screens) were used for individual anaerobic digestion and co-digestion with agricultural biomass. The initial TS level (4%) and substrate to inoculum ratio (3:1) were maintained into all runs at mesophilic conditions, and the co-substrates was mixed at the recommended VS ratio of 1:1 (sludge: straw under the co-digestion conditions. It was found that the mixed sludge exhibited prominent anaerobic digestion performance, selected as a potential reagent for the co-digestion with biomass. The total volume of the produced methane from co-digestion of the mixed sludge and wheat stalk reached to 187.01 ± 3.27 mL g−1 VSadded, which was about 1.52 times higher than that from the individual digestion of the sludge. The experimental value of methane yield from co-digestion of the mixed sludge with wheat stalk is about 9.46% more than that of the estimated value, imply the enhanced interactions between the sludge and biomass during the co-digestion process. The pH of the co-digestion system of the mixed sludge and the wheat stalk was maintained at a relevant stable value around 6.50. It indicated that the buffering capacity of the digestion system could improved by adding the mixed sludge. The modified Gompertz model and the first-order kinetic model were proposed to simulate the co-digestion process between the mixed sludge and agricultural straw. The estimated kinetic parameters indicated that the maximum releasing rate of methane was significantly increased during the co-digestion process. Graphic Abstract
Keywords Sewage sludge · Corn straw · Wheat stalk · Co-digestion · Methane
Statement of Novelty * Dekui Shen [email protected] * Youzhou Jiao [email protected] Extended author information available on the last page of the article
Usually, the wastewater treatment plants have anaerobic digester which can receive agricultural straw as the cosubstrates to co-digest with sludge for enhancing methane production. There are several different types of sludge
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produced from sewage treatment process, different types of sludge have different anaerobic digestion performance. This paper provided the results of individual anaerobic digestion characteristics of three different types of sewage sludge, and help to screen out the sludge which is more suitable for codigesting with agricultural straw. Then the co-digestion of selected sludge and straw were carried out, it was found a synergistic effect showed on cumulative methane production. The results of this study give a conceptual guide for value-added utilization of urban sewage sludge and agricultural wastes.
Introduction Nowadays, sewage sludge, the main solid waste produced from the waste
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