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An oil company produces a wastewater and would develop an integrated Unit for the biological treatment....

An oil company produces a wastewater and would develop an integrated Unit for the biological treatment. You are assigned to overview this project with some engineers available to construct all the steps of the process. The characteristics of the wastewater are the following: Total COD = 35 kg/m3 Soluble COD= 22 kg/m3 Total suspended solids and oil = 18.7 kg/m3 The pre-treated wastewater after the separation of suspended sis characterized by a BOD of 21.5 kg/m3. The engineer obtained 87% BOD removal with the selected technology and the treatment of 1 m3 of wastewater produced 10/m3 biomass. Knowing that the flow rate of the wastewater is 20 m3/d, all treated in one day in a reactor of 50 m3 ( useful volume). Calculate the hydraulic loading rate

1. 25 m3/ m3.d

2. 2.5 m3/ m3.d

3. 4 m3/ m3.d

4. 0.4 m3/m3.d

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Answer #1

hydraulic loading rate = (20 m3/d)/ (50 m3)

= 0.4 m3/m3.d

so option 4

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