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(10 points). Explain the two main reasons why Hyrum City built the new membrane bioreactor.

Hyrum City wastewater treatment plant is discharging the water to Cutler Reservoir or to the secondary irrigation system. Therefore, assessments been conducted regarding the discharged water to Cutler Reservoir. The results pointed to the TMDL of phosphorus which requires limitation and regulation. With this intension, Hyrum City obtained UBDES permit for the seasonal limits of discharging phosphorus to Cutler Reservoir. In order to meet the TMDL of phosphorus by decreasing the discharged phosphorus efficiently, Hyrum City had to build new membrane bioreactor. Coupled with, increasing and upgrading the capacity of the facility in the wastewater treatment plant was another reason to build the new membrane bioreactor. As shown above, achieving the assigned TMDL phosphorus and upgrading the capacity of the wastewater plant are the two reasons beyond having new membrane bioreactor.

(10 points). What is the function of the screens?  Where are the screens located within the overall treatment process?

# The screens are considered to be the first unit of operation in the wastewater treatment plant. Therefore, the location of the screens is at the beginning of the treatment process. By all means, the screens are known as the first filtration agent for the influent wastewater. Their function is to remove and collect the large particles from the flow stream, then they will be transport to the landfill. Removing these coarse materials is essential to ensure the effectiveness of the treatment process. These materials like rocks can damage the equipment of the treatment process and contaminate the waste way. For this reason, the screens considered to be the first defensive wall in this treatment process.

(10 points). How do they treat and dispose of the biosolids? (start with the belt press)

The belt press is performing its function on the wasted sludge that been stored in the storage tanks. After transferring the supersaturated water from the storage tanks to the belt press, the solids (face drying process). Then, the dried solids react with a coagulation agent to transform the solids to be thicker. Moreover, compressing the supersaturated water leads the water to be returned to the filtration process. In due time, the thick solids transfer from the belt press to the drying beds. The biosolids reside in the drying beds with a time frame to be a year in period regarding the temperature. The temperature has to exceed certain degrees in order to kill pathogens. This biosloids consider to be Class B Biosolids which has detectable levels of pathogens. Eventually, this class of biosolids apply for agriculture use or land reclamation purposes. It is for animal crop use not for general public use.

(15 points). Explain how circulating water between the anoxic basins and aerobic basins, in conjunction with alum addition, removes phosphorus. Be sure to discuss the role of the membranes.

The bacteria (bugs) release the phosphorus they have in the anoxic basins because of the lack of oxygen. During the shortage of the oxygen, the microbes break the ATP to gain energy which leads to the releasing of phosphorus. In the meantime, the addition of the alum contributes to solidify the released phosphorus when the alum reacts with phosphorus. Flowing the wastewater to the aerobic basins where the oxygen is present drive the bacteria uptake the available phosphorus to create ATP. In the aerobic basins there are approximately 200 permeable membranes for water only. They allow the water without the small particles to be flowed to the UV reactors. From time to time, the water is circulating between the anoxic basins and aerobic basins in order to remove phosphorus. Generally speaking, the anoxic basins remove phosphorus

through the solidification process by alum, and the aerobic basins remove phosphorus via the uptake of phosphorus by bacteria.

(15 points). Where does the Hyrum WWTP discharge the treated water?  Discuss how this changes seasonally.  Explain how their phosphorus (P) discharge limit is related to the discharge location and season. Include the specific P limits (mg/L) in your discussion.

Hyrum wastewater treatment plant is discharging the treated water to Cutler Reservoir and to the secondary irrigation system. With this in mind, the discharging time to the secondary irrigation system occurs from March to October while it is during the whole year for Cutler Reservoir. The pathway for the treated water to Cutler Reservoir is starting from the ditch to the river where it is flowing toward Cutler Reservoir. Phosphorus discharge limit differs seasonally regarding its destination to Cutler Reservoir. During the Summer from July to September, the discharge limit is 0.1 mg/L, and it is 1 mg/L for a period other than July to September. On the contrary, there is not discharge limit of phosphorus when it is discharging (Discharged) to the secondary irrigation system in order to be reused.