Discharge of wastewater
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There is an existing chemical plant whose wastewater has a pH of 3–4. The wastewater volume to be discharged is as follows: 100 cubic meters per 8 hours over a distance of 2500 meters; 300 cubic meters per 8 hours over a distance of 400 meters; and 400 cubic meters per 8 hours over a distance of 600 meters. To discharge this wastewater, 3500 meters of piping is required. It is planned to use PPR pipes for this purpose, and the appropriate pipe diameter and the rationale behind it are under discussion.
This is a problem related to the selection of economic pipe diameter; it is first necessary to understand the discharge pattern of each unit volume of wastewater, as well as the maximum, average, and minimum flow rates； Then select the fill degree, taking into account pipe layout, shaft arrangement, design flow velocity, and pipe diameter.