Construction managers, also called general contractors or project managers, typically do the following: 1  Prepare and negotiate cost estimates, budgets, and work timetables. 2  Select appropriate construction methods and strategies. 3  Interpret and explain contracts and technical information to workers and other professionals.
Denitrification is the process that converts nitrate to nitrogen gas, thus removing bioavailable nitrogen and returning it to the atmosphere. Dinitrogen gas (N2) is the ultimate end product of denitrification, but other intermediate gaseous forms of nitrogen exist (Figure 7).
Nitrogen removal is an efficient and reliable process. Nitrogen in wastewater mainly takes the form of ammonia, an ion that is difficult to precipitate. Nitrogen is therefore normally removed in a biological process consisting of two steps â nitrification and denitrification.