ATAD control goals through the analysis of process variables and evaluation of quality, production and cost

  1. Nájera, S. 2
  2. Gil-Martínez, M. 2
  3. Zambrano, J.A. 1
  1. 1 Uppsala University
    info

    Uppsala University

    Upsala, Suecia

    ROR https://ror.org/048a87296

  2. 2 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
Water Science and Technology

ISSN: 0273-1223

Ano de publicación: 2015

Volume: 71

Número: 5

Páxinas: 717-724

Tipo: Artigo

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DOI: 10.2166/WST.2015.006 SCOPUS: 2-s2.0-84925275118 WoS: WOS:000351218900009 GOOGLE SCHOLAR

Outras publicacións en: Water Science and Technology

Resumo

The aim of this paper is to establish and quantify different operational goals and control strategies in autothermal thermophilic aerobic digestion (ATAD). This technology appears as an alternative to conventional sludge digestion systems. During the batch-mode reaction, high temperatures promote sludge stabilization and pasteurization. The digester temperature is usually the only online, robust, measurable variable. The average temperature can be regulated by manipulating both the air injection and the sludge retention time. An improved performance of diverse biochemical variables can be achieved through proper manipulation of these inputs. However, a better quality of treated sludge usually implies major operating costs or a lower production rate. Thus, quality, production and cost indices are defined to quantify the outcomes of the treatment. Based on these, tradeoff control strategies are proposed and illustrated through some examples. This paper's results are relevant to guide plant operators, to design automatic control systems and to compare or evaluate the control performance on ATAD systems. © IWA Publishing 2015.