A stream receives a waste outfall which results in oxygen at saturation levels when mixed. The initial condition right after entry of the waste creates a BOD5 of 40 mg/l. KBOD is 0.3/day and KO2 is 1.3/ day. The stream temperature is 12 degrees centigrade. In terms of travel time when does the maximum DO sag occur? What is the minimum DO concentration in the river at the maximum sag point? If the average stream velocity is 3 feet per minute, what is the downstream location of the DO sag minimum relative to the location of the waste stream? Use the relevant equations provided in the textbook to solve this problem.

A stream receives a waste outfall which results in oxygen at saturation levels when mixed. The initial condition right after entry of the waste creates a BOD5 of 40 mg/l. KBOD is 0.3/day and KO2 is 1.3/ day. The stream temperature is 12 degrees centigrade. In terms of travel time when does the maximum DO sag occur? What is the minimum DO concentration in the river at the maximum sag point? If the average stream velocity is 3 feet per minute, what is the downstream location of the DO sag minimum relative to the location of the waste stream? Use the relevant equations provided in the textbook to solve this problem.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The results of a water analysis for Sungai Buaya is shown below: = 2.5 meq/L Mg²* = 0.6 meq/L Na* 1.7 meq/L SO? = 2.0 meq/L 0.2 meq/L Ca²+ HCO; %3D 2+7 = 0.4 meq/L = 0.4 meq/L Cl K+ (i) Calculate the concentration for each cation and anion component in mg/L (ii) Draw a miliequivalent per litre bar graph (iii) List the hypothetical combinations with values (iv) Calculate the non-carbonate hardness in mg/L as CaCO3
Subject: Environmental science Give me right solution A stream receiving sewage effluent has an initial DO deficit of 1.5 mg/L at the discharge point of this sewage. DO deficit at the downstream critical point is 4.5 mg/L. The stream has a saturated DO of 8.0 mg/L under the ambient temperature condition. The lowest DO downstream of this effluent is _____ mg/
The discharge from the Renenutet sugar beet plant causes the DO at the critical point to fall to 4.0 mg/L. The Meskhenet Stream has a negligible BOD and the initial deficit after the river and wastewater have mixed is zero. What DO will result if the concentration of the waste(L_w) is reduced by 50%? Assume that the flows remain the same and that the saturation value of DO is 10.83 mg/L in both cases.
An anaerobic digester (AD) is designed with the following data. Organic loading rate 1.0 kg VSS/m³.day VSS load 120 kg/day (i). (ii). Estimate the volume of the AD. If the VSS is 12 kg/m³, estimate the retention time.
Enter T next to the following true statements and F next to the false statements. Settling of suspended solids in secondary clarifiers is typical of Type II sedimentation. Thickening prior to digestion is common in many wastewater treatment plants because it reduces the size needed for the digester. Based on a temperature of 30°C, a design mean cell residenee time of about 20 days would be reasonable for a completely-mixed anaerobic digester without recycle. A volatile suspended solid is defined as an organic solid that can be oxidized to CO2 (g) at 250°C. The theoretical yield coefficient can be estimated from the observed yield coefficient if the specific growth rate constant is known. Air flotation would likely be more efficient for thickening waste activated sludge than primary sludge, while the opposite would be true for gravity thickening. The net mass of cells produced in the activated sludge process equals the total cell mass synthesized minus the cell mass wasted as waste…
The influent suspended solids concentration to a primary settling (clarifier) tank is 300 mg/L. The average flow rate is 0.037 m3/s. If the suspended solids removal efficiency is 65 percent, how many kilograms of suspended solids are removed in the primary settling tank each day?
A waste sludge flow of 40 m³/day is gravity thickened in a circular tank with a diameter of 6.8 m. The solids concentration is increased from 4.5% to 7.5% with 85% suspended- solids capture. Calculate the solids loading in kg/m² d and the quantity of thickened sludge in m³/d.
7
Q2-) The waste flow 18000 m³/day is treated by activated sludge process to reduce 97.5% of influent BODS proce concentration of 250 mg/L. The ratio of formed cell mass and substrate utilized mass are 0.4 and 0.8, respectively, MLVSS = 3500 mg/L, return sludge (Xr) = 8000 mg/L, decay growth rate = 0.05, and 8c = 10 days. Find the following: 1. Reactor volume and hydraulic retention time. 3. The daily amount of wasted sludge. 5. Food to microorganisms' ratio. 2. The volumetric organic loading 4. The recycle ratio, and treatment efficiency.
A sewage treatment plant uses the activated sludge process in its biological treatment unit with discharge of 8000m³/day having a MLVSS concentration of 3000mg/l in the aeration tank which has a volume of 25000m The BOD was 300mg/l in primary sedimentation tank. Calculate the organic loading F/M ratio.
Please ans a and b
Coagulation aided sedimentation produces 135m³ of sludge per day. The solid content of sludge is 1% by weight and specific gravity of sludge solid is 2.7. If 20 my of suspended solids are removed from the raw water by the Al(OH)3 precipitate formed, and flow through the treatment plant is 40 MLD, then the amount of alum required per day in kg is