{'fraction_non_alphanumeric': 0.018001800180018002, 'fraction_numerical': 0.004500450045004501, 'mean_word_length': 5.177777777777778, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Evaluation of Greenhouse Gas Emissions from a Continuous Activated Sludge Process under Power Saving Conditions

Emissions of greenhouse gases were evaluated using a lab-scale continuous activated sludge reactor for the purpose of power saving at on-site domestic wastewater treatment facility. In addition, the behavior of N 2 O production was investigated to figure out the factors reducing N 2 O production. The experiments were performed under three power saving conditions. The relation between N 2 O production and ammonia, nitrite, nitrate, and dissolved oxygen concentrations was clarified. As a result, it was found that suitable control of ammonia oxidization is an important factor to reduce N 2 O production. Higher emission of greenhouse gases was observed in long-term power saving condition compared with the other conditions because of high N 2 O emission. The emissions of greenhouse gases were almost the same for conventional condition and short-term power saving condition. However, in light of power shortages, short-term power saving condition has an advantage over conventional condition.