Waste management and recycling assessment

Reference no: EM133113169

Assessment task - Waste Management and Recycling

Question 1
a) What are the 4 main types of pollutants in domestic wastewater (sewage)?
b) Name the methods by which each type of these pollutants can be treated before their disposal into waterways.
c) What are the NSW EPA standards for solids, organics and bacteria, total nitrogen in treated sewage effluent?

Question 2
a) What are the main functions of the following components in a sedimentation tank: inlet, outlet, bottom slope?
b) What is the significance of the ratio of BOD5/COD and FC/FS?
c) List two differences between sedimentation tanks used in trickling filters and activated sludge plants.
d) Settled sewage is to be treated by two trickling filters placed in parallel arrangement. The settled sewage total flow and BOD5 are 8000 m3/day and 150 mg/L. Assume organic loading and hydraulic loading rates are 0.12 kg/m3.day and 1.5 m3/m2.day respectively. Calculate the diameter and height of each trickling filter.

Question 3
a) What are the different treatment processes used in NSW in tertiary treatment of sewage?
b) What are the two main functions of maturation ponds in sewage treatment? How are these functions achieved in the ponds?
c) A sludge of 500 m3 is to be dewatered by centrifuge. If the solid content of sludge before and after dewatering is 1% (volume/volume) and 25% (volume/volume), calculate the amount of water removed by this process.

Question 4
a) Briefly explain the concept of IDAL plant in the Quakers Hill sewage treatment plant?
b) How is the sludge treated in this plant and why?

Question 5
a) Compare microfiltration, ultrafiltration, nanofiltration and reverse osmosis in terms of pressure and pore size (with typical values).
b) Briefly explain the concept of membrane bioreactor. What are the three main advantages of membrane bioreactor compared to conventional biological treatment?

Reference no: EM133113169

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