4.6 Article

An efficient anoxic/aerobic/aerobic/anoxic process for domestic sewage treatment: From feasibility to application

Journal

FRONTIERS IN MICROBIOLOGY
Volume 13, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2022.970548

Keywords

biofilm; domestic sewage; elemental-sulfur-based autotrophic denitrification; multi-chamber; no sludge reflux; vibration

Categories

Funding

  1. National Key Research and Development Program of China [2020YFC1806402]
  2. Major Key and Core Technology Research Project [20-202-4-37]
  3. Ningxia Provincial Natural Science Foundation of China [2020AAC03272]

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This paper proposes an anoxic/aerobic/aerobic/anoxic (AOOA) process using fixed biofilms in a continuous plug-flow multi-chamber reactor. By adjusting the reactor volume ratio and dissolved oxygen concentration, the domestic sewage was efficiently treated, with the elemental-sulfur-based autotrophic denitrification (ESAD) process contributing the most to the removal of total inorganic nitrogen (TIN).
In this paper, the anoxic/aerobic/aerobic/anoxic (AOOA) process was proposed using fixed biofilms in a continuous plug-flow multi-chamber reactor, and no sludge reflux operation was performed during the 190 days of operation. The reactor volume ratio of 1.5:2:1.5:1 (A/O/O/A) with the dissolved oxygen (DO) concentration of 2 mg L-1 in the aerobic zone was the optimal condition for reactor operation. According to the results obtained from the treatment of real domestic sewage, when the hydraulic retention time (HRT) was 6 h, the effluent of the reactor could meet the discharge standard even in cold conditions (13 degrees C). Specifically, the elemental-sulfur-based autotrophic denitrification (ESAD) process contributed the most to the removal of total inorganic nitrogen (TIN) in the reactor. In addition, the use of vibration method was helpful in removing excess sludge from the biofilms of the reactor. Overall, the AOOA process is an efficient and convenient method for treating domestic sewage.

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