{'fraction_non_alphanumeric': 0.01811023622047244, 'fraction_numerical': 0.005511811023622047, 'mean_word_length': 5.052380952380952, '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}}
PROCESS DYNAMIC ASPECTS IN CONTINUOUS ANAEROBIC FERMENTATION

The classical process of waste water treatment has always been aerobic digestion. Due to increasing costs for aeration energy and the problems of sludge disposal, the question of whether or not the usual process is the ideal one gains relevance. Nowadays, more and more anaerobic fermenting tanks for purification of waste water are built, often in conjunction with aerobic plants. Especially for the treatment of industrial waste waters with defined chemical composition, anaerobic fermentation may be a suitable method. The quantity of biomass production is relatively small and a part of the chemical energy can be utilized by burning the produced methane. On the other hand, low stability and low conversion rates due to the slow growth of anaerobic bacteria often are mentioned as disadvantages. One example of well-defined waste water is the condenser water distilled from the sulfite solution of pulp processing. It has a high chemical oxygen demand (COD), which is caused by acetic acid in concentrations of about 100 to 250 mmol/l. A suitable method could be anaerobic fermentation with Methanosarcina barkeri, an organism that converts acetic acid directly into methane and carbon dioxide (Eq. 1) .