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Welcome back to TPO magazine's Exam Study Guide Series, which offers a pair of water/wastewater study questions with in-depth explanations of the answers. Last time, we covered a set of wastewater and drinking water treatment questions on the topics of Facultative Lagoons; and Hypotonic Solutions. This time, you can test your knowledge about anaerobic digester pH levels, and removing multivalent ions in drinking water. Wastewater Treatment Sample Question What is the desired pH levels for a properly operating anaerobic digester? A. 4.0 – 6.6B. 6.8 – 7.2C. 7.6 - 9.0D. Above 10.0 Answer: The answer to this question is B. Anaerobic digesters can operate at pH levels from 6.0 to 8.0, with
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