Journal
CHEMOSPHERE
Volume 307, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.135852
Keywords
Ship wastewater; Activated sludge; Membrane biofilm; Temperature; Energy consumption
Categories
Funding
- National Science Foundation of Nanosystems Engineering Research Center on Nanotechnology-Enabled Water Treatment [EEC-1449500]
- Nanotechnology Collaborative Infrastructure Southwest [NNCI-ECCS-1542160]
- Fundamental Research Funds for the Central Universities [2412022QD019]
- China Postdoctoral Science Foundation [2022M710654]
- National Key RD Plan of China [52171347]
- Qingdao West Coast New Area Science and Technology Program Special
- China Scholarship Council [201906680080]
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The study evaluated the temperature response of a novel biological treatment system for ship wastewater, demonstrating its effectiveness in meeting international discharge standards at low temperatures. It was found that the biofilm stage became more important for COD and TN removal at low temperatures, compensating for the deterioration in performance of the aerobic sludge.
A particular challenge to treatment systems for ship wastewater comes from low and variable temperatures. We evaluated the temperature response (35-15 degrees C) of a novel biological treatment system involving activated sludge followed by a membrane-biofilm reactor: the activated sludge/membrane-biofilm reactor (AS-ABfMemR). In this study, a pilot-scale AS-ABfMemR achieved over 96% chemical oxygen demand (COD) and 94% total nitrogen (TN) removal from a ship wastewater (550-960 mgCOD.L-1 and 52-77 mgTN.L-1) with a continuous operation with a hydraulic retention time of 12 h at 25 degrees C. The effluent COD and TN concentrations met IMO discharge standards at temperatures as low as 17 degrees C, which reduced the energy consumption for wastewater heating. The COD and TN removals of the biofilm stage became important (up to 34% and 35%, respectively) at low temperatures, and this compensated for the deterioration in performance of the aerobic sludge. The genus Azospira dominated in the biofilm's denitrification removal for TN at low temperature. In addition, the buildup of transmembrane pressure was so slow that backwashing was not needed over the 90 days of continuous operation. These conclusions indicate that the pilot-scale AS-ABfMemR technology is an effective way for real ship sewage treatment under temperature variations.
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