What are the pollutant removal mechanisms

Reference no: EM131466584

Assignment 1

Question 1
(a) What are the 4 different pollutants in domestic wastewater (sewage). Name the methods by which each of these pollutants can be treated before disposal into waterways.
(b) Describe briefly the two ways phosphorus is removed from sewage in a wastewater treatment plant
(c) What are the pollutant removal mechanisms in an intermittently decanted aerated lagoons (IDAL) used in wastewater treatment plant.

Question 2
a) Compare the ultrafiltration with nanofiltration in terms of pressure, pore size and energy requirements (with typical values).
b) Explain the membrane bioreactor using a schematic diagram. What are the three main advantages of membrane bioreactor compared to the conventional biological treatment.

Question 3
a) Why is it important to have dewatering of digested sludge?
b) What are the beneficial uses of biosolids?

Question 4
a) What is the advantage of dual media filter over sand filter?
b) How can N removed from wastewater treatment?

Question 5
a.Compare the solids and bacterial concentrations allowed in the (i) treated sewage effluent and (ii) drinking water
b.How is microorganisms measured in sewage?

Question 6: A metal plating industry produces wastewater from Chromium (0.5 m3/d) and Nickel plating (0.5 m3/d) and waste acid cleaning (4 m3/d) activities. If the Chromium and Nickel concentrations are 0.01 kg/m3 and 0.005 kg/m3, find the amounts of Chromium and Nickel wasted on a daily basis. Suggest a simple waste minimization program in this industry.

Question 7: (30% of the marks for this assignment is for this question)
This question can be done in group of two
List two existing examples on water reuse practices (place, what purpose, standards, methodology used, benefits and cost). One example should be from references other than the lecture notes. You may find details from EPA documents, national and international conference proceedings, recently published textbooks and web sites.

Assignment 2

Question 1
The waste contributing steps to tomato processing industry is listed below with quantities and biochemical oxygen demand (BOD) and suspended solids (SS) values

Stream	Process Unit	Flow (L/min)	BOD (mg/L)	SS (mg/L)
#1	Prewashing units	1890	75	180
#2	Washer	1000	90	340
#3	Boiler feed water	1136	30	20
#4	Cooker	38	3520	7575
#5	Processing unit #1	76	4410	8890
#6	Processing unit #2	570	230	170
#7	Processing unit #3	380	450	540

a) Provide a suitable waste segregation (separation) and treatment scheme
b) What will be the flow and BOD concentration of the combined stream of #4 and #5

Question 2

List three methods to achieve waste minimization in paper and pulp manufacturing processes and indicate how and in which steps these methods can be employed?

Schematic diagram of the paper and pulp manufacturing processes and waste contributing steps are shown below:

Question 3

List 3 main human barriers of Waste minimization.

Question 4

Suggest a treatment method for reuse or by-product recovery for the following wastes.
a. Dairy (milk) waste containing whey (protein) material
b. Cutting oil waste coming from metal cutting machines
c. Dye waste from cloth dyeing (textile) industry.

Question 5

Using the flow diagram given below explain the role of
i) Filter
ii) Activated carbon
iii) Filter press
iv) Equalization (equalizing) tank.

Question 6

(a) What are the 2 different environmental problems of using incinerators? How can they be overcome?
(b) Based on the data provided below, calculate the charges for disposal of the waste with and without recycling at the transfer station, and comment on these costs.

Waste generated 10 tonnes

Recyclable waste 70 %

Transport costs $ 1 per tonne per km

Distance to landfill 120 km

Location of transfer station mid way

Cost of recovery at transfer station $10 per tonne

Sale value of recyclable goods $15 per tonne

Tipping cost $40 per tonne

Question 7

Estimate the moisture content and density of a solid waste sample with the composition given in Table below.

Component

Percentage by Mass

Moisture (%)

Density (kg/m³)

Energy (KJ/kg)

Food waste

Paper

Garden trimmings

Wood

Metal cans

290

110

250

4650

16700

6550

18700

500

Question 8

Describe the seawater desalination processes and their functions in a desalination plant in Australia. Compare the processes with Sydney's drinking water treatment plant process.

Assignment 3

1. Design a constructed wetland to treat domestic wastewater from a small town of 6000 population. Wastewater generation is at 160 litres per capita per day. The initial BOD of the primary treated wastewater is 180 mg/l and the treated wastewater needs to conform to a BOD standard of 30 mg/l. Fine and medium sized gravel are as substrate material for wetland bed of depth 0.6 m. Assume the water depth is 0.4 m and the hydraulic gradient is 0.003. Further assumptions are porosity of 40% and hydraulic conductivity of 10.2 x 10-2 m/sec. Annual average temperature of water is 27oC.

2. Calculate the volume of rain tank required for Rain Water Harvesting. The area of the roof is 100 m2. Assume the average ddemand is =50 L/person per day. The house is occupied by four people. The monthly rainfall is summarised in the table below.

Jan	Feb	Mac	Apl	May	Jun	July	Aug	Sep	Oct	Nov	Dec
103	117	131	127	123	128	98	81	68	76	83	78

3. Undertake a literature review of a BMP device of your choice. Focus on the planning, modelling, design and implementation aspects of the BMP. (not more than 5 pages). Literature on UTS online is generally sufficient for this purposes, however students must not be limited by this.

Reference no: EM131466584

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Reviews

len1466584

4/18/2017 7:30:19 AM

The lecture notes provide adequate information on each topic relevant to this subject. You are expected to refer to other references to answer the assignment questions. This website contains a lot of valuable information on ‘how to…’! It is especially useful for downloading forms, checking the exam timetable etc.The exam will consist of a number of short-answer questions both quantitative and qualitative. In order to pass the subject, you have to obtain a minimum of 50% in the final quiz.Assignment 1 (10%) Assignment 2 (15%) Assignment 3 (10%) Class assignments (15%): In Block 2 and Block 3 there will be short group assignments. Assignments will be provided to be worked in the class. Distance mode students will receive this by email.

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