The design flow (average daily flow) for a new trickling filter plant for the tri-cities is 52,000 m/d. Raw wastewater characteristics are: 240 mg/L BOD, 240mg/L TSS. Primary settling tank (PST) removes 33% BOD, 70% TSS. The final effluent should have less than 20 mg/L BOD and less than 20 mg/L TSS. Filter depth is 3.2 meters. Determine the diameter of single stage trickling filter(s) using the NRC equation if they are using 3 trickling filters and a recirculation ratio of 3. If we use the BOD loading criteria of 0.6 kg/d-m' and hydraulic loading rate of 16 m/d-m2 to design the trickling filter will the volume calculated using the NRC equation above be sufficient?

The design flow (average daily flow) for a new trickling filter plant for the tri-cities is 52,000 m/d. Raw wastewater characteristics are: 240 mg/L BOD, 240mg/L TSS. Primary settling tank (PST) removes 33% BOD, 70% TSS. The final effluent should have less than 20 mg/L BOD and less than 20 mg/L TSS. Filter depth is 3.2 meters. Determine the diameter of single stage trickling filter(s) using the NRC equation if they are using 3 trickling filters and a recirculation ratio of 3. If we use the BOD loading criteria of 0.6 kg/d-m' and hydraulic loading rate of 16 m/d-m2 to design the trickling filter will the volume calculated using the NRC equation above be sufficient?

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

### Problem Statement

**Design Challenge for a New Trickling Filter Plant**

The design flow (average daily flow) for a new trickling filter plant for the tri-cities is 52,000 m³/d. The wastewater characteristics are as follows:

- **Biological Oxygen Demand (BOD):** 240 mg/L
- **Total Suspended Solids (TSS):** 240 mg/L

The primary settling tank (PST) removes:

- **33% BOD**
- **70% TSS**

The final effluent should meet these criteria:

- Less than 20 mg/L BOD
- Less than 20 mg/L TSS

**Filter Specifications:**

- **Depth:** 3.2 meters

**Design Task:**

Determine the diameter of single-stage trickling filter(s) using the NRC equation if they are using 3 trickling filters and a recirculation ratio of 3.

### Additional Considerations

**Loading Criteria:**

- **BOD Loading Criterion:** 0.6 kg/d·m³
- **Hydraulic Loading Rate:** 16 m³/d·m²

Will the volume calculated using the NRC equation be sufficient based on the criteria provided?

### Instructions

Calculate the required diameter for the trickling filters and verify if the volume meets the loading criteria using the NRC equation. Ensure that the design can achieve the specified effluent quality standards.

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