# Science Tutors

 Subject Science Due By (Pacific Time) 12/15/2016 09:00 am

You are a consultant working on an assignment for an agricultural products processing company who wants to put a new facility in Palouse, Washington. The new facility will process food products produced on the Palouse. To accommodate wastes from the new facility along with waste from the new residential area planned to house workers at the facility, a new waste water treatment plant must be installed. The proposed design is for a two stage treatment process using a primary clarifier and simple aeration pond with no recycle for secondary treatment. It is estimated that the new facility will bring 10,000 new people to the area who will produce 0.5 m3 of wastewater per day and the facility itself will produce 1000 m3 of wastewater per day. Because land area isn’t an issue, a conventional (non-high rate) clarifier will be used, which removes 25% of incoming BOD5. BOD5 of the incoming wastewater is estimated at 350 mg/L. The aeration pond is assumed to follow default microbial kinetic parameters for 20 °C and should treat the waste stream to the maximum allowable BOD5 level of 30 mg/L. You are tasked with evaluating the plan by performing some rough design calculations and assessing the feasibility of each wastewater treatment step. Design Tasks for the wastewater plant: ï‚· Determine the diameter of the primary clarifier. ï‚· Determine the required volume of the aeration pond and estimate the required diameter assuming 5 m depth. ï‚· Are these feasible? Should other options be assessed for either step of the treatment process? The second step of your assignment is to assess the impacts of the effluent once it has been released into the north fork of the Palouse River. The low flow for the river is 2 cfs and the average stream depth is 1 m. It can be assumed that BOD5 in the stream is 5 mg/L. The temperature of the stream during low flow is 20 °C. A deoxygenating rate constant is assumed to be 0.2 day-1 . Dissolved Oxygen levels below 5 mg/L are undesirable and levels below 3 mg/L are dangerous for the ecosystem. Design Tasks for the Effluent: ï‚· Plot the dissolved oxygen sag curve for the effluent and the stream conditions given. ï‚· Discuss whether the new wastewater facility will have a negative impact on the river and if so, propose design alterations that would mitigate these impacts

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