Water Chemistry Case Study - Domestic Wastewater Source - Engineering Report Writing Assignment Help

Water Chemistry Case Study Engineering Report Writing Assignment Help

Assignment Task:

Assignment Requirements:

Write a report of ~2000 words in total containing appropriate photos, diagrams and figures (in an Appendix where appropriate) that addresses ONE of the following
issues. The report should include a title, table of contents, summary, findings and discussion, page numbers, together with an appropriate reference list.

1. During an extended period of drought a regional water authority found that a river, used as a source drinking water, had total dissolved solids (TDS) concentration > 1500 mg L-1 , turbidity < 5.0 NTU, DOC of 1 mg L-1 and colour < 10 HU. When the drought ended and the river flooded, the TDS dropped to < 150 mg L-1 , but the turbidity increased to 75 NTU, DOC increased to 12 mg L-1 and colour to 80 HU. You work for this water authority as an engineer/scientist and have been asked by
your operations manager to propose treatment processes for these two water types in order to provide safe clean drinking water for the community. As requested by the operations manage you are to investigate suitable treatment processes that can be applied in both situations. Describe these treatment options in detail and clearly justify your proposed treatment options. You may refer where needed to the Australian Drinking Water Guidelines updated 2013, Chapter 10 (including Table 10.5 Guideline values for physical and chemical characteristics).

2. You are assigned to operate a drinking water treatment plant which has a capacity of 280 ML per day. The source water is from a river that contains a high concentration of dissolved organic carbon (DOC), (13 mg L-1 ) and has a high colour (60 HU) but where the alkalinity changes seasonally. In summer to winter the alkalinity is high (> 100 mg L-1 as CaCO3) and in spring after snow has melted in the mountains and the water flows into the river, the alkalinity is very low (< 15 mg L-1
as CaCO3). You have a range of chemicals available with which to treat the water for drinking water supply including (1) Aluminium Chloro Hydrate, (2) Poly Aluminium Chloride, (3) Alum (Al2(SO4)3:18H20) (4) chlorine (5) sodium hydroxide (6) calcium carbonate (lime), and (6) the polymer floc aid: PolyDADMAC. Propose how some or all of these chemicals could be used to treat the water when it is high in alkalinity and when it is low in alkalinity. Give reasons for your selection of particular chemicals and report the purpose of each of the chemicals that you have selected. If the coagulant(s) you have selected need to be dosed into the raw water at 90 mg L-1, calculate the mass of coagulant that needs to be dosed per day if the plant is operating at full capacity. If 5% of total raw water influent was used for filter backwashing without recycling and another 5% was lost due to sludge discharge and chlorine needs to be dosed is at 1 mg L -1 for the water after treatment, calculate the mass of chlorine that needs to be dosed each day at the treatment plant.

3. A domestic wastewater source has 1560 mg L-1 BOD, 82 mg L-1 total nitrogen (comprising Total Kjeldahl Nitrogen (TKN), nitrate and nitrite, and ammonia) and 15 mg L-1 soluble phosphorus (SP). These parameters need to be brought to < 30 mg L-1 BOD, < 15 mg L-1 for total nitrogen and < 2.5 mg L-1 for SP before being discharged into a local river. Investigate possible wastewater treatment methods that could be applied to remove these pollutants to the levels required. Calculate the percentage removal required for each pollutant. If the wastewater is to be used for a recycled water supply to domestic households for non-potable use, such as watering gardens, toilet flushing and washing of pavements, investigate what further treatments should be applied.

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