Answer to Question #261089 in Civil and Environmental Engineering for angel

Question

Write the overall reaction for the situation in which acetate is the donor and carbon source, nitrate is the acceptor and nitrogen source, and f. = 0.333.

Answer 1

The first generation nitrogen removal processes involve the conventional nitrification- denitrification pathway. There are many types of process configurations that are currently used for total nitrogen removal based on the nitrification-denitrification pathway. The most common include the original Ludzac-Ettinger, the Modified Ludzac-Ettinger (MLE) and Bardenpho configurations (Eddy et al., 2014). The MLE configuration consisted of a pre-anoxic denitrification reactor followed by an aerobic reactor. The process involves nitrification in the aerobic zone and recycling the nitrate that is produced in the aerobic zone to the anoxic zone where denitrification occurs. The MLE differs from the original Ludzac-Ettinger configuration, where the denitrification (anoxic) reactor is located post the aerobic reactor, often referred to as post-denitrification. In most post-denitrification configurations, the external carbon source is added to the anoxic zone to compensate for the carbon source that is already utilized (oxidized) in the aerobic zone. The most effective TN removal configuration is the Bardenpho that combines pre anoxic, aeration, post anoxic, and secondary aerobic zones with internal recirculation from the first oxic zone to the first anoxic zone, while denitrification in the second anoxic zone mainly relies on the carbon source released during endogenous respiration.