...o AT&T 8:58 : 55% ENV447 Fall 2018 Homework USH SOUTH FLORIDA ENV 4417- WATER

Question

...o AT&T 8:58 : 55% ENV447 Fall 2018 Homework USH SOUTH FLORIDA ENV 4417- WATER QUALITY AND TREATMENT PROF. DANIEL YEH Homework 2 65 pts total Problem 1: Solids calculations (based on Problem 8.26) (20pt) Listed below are total solids and suspended-solids data on an industrial wastewater sample Total solids data Weight of empty dish-85.337 Weight of dish Weight of dish plus ignited so Volume of wastewater sample 83ml solids data Weight of glass-fiber filter disk 0.1400 solids 85490 t of disk plus dry solids-0.1530 olids 85.375 eight of disk solids 0.1426 olume of wastewater filtered- 200 ml Calculate the total solids (TS), total suspended solids (TSS), total dissolved solids (TDS) (expressed as mg/L) (Note: TS TSS+TDS) For each of these three solids fractions, calculate the volatile (organic) and fixed (inorganic) fractions, expressed as both mg/L and % of total. (Note: totalvolatile+fixed Summarize your results in the following table inorganic) % of total total Volatile (organic) Fixed ( % of total L Total solids ded solids Dissolved solids 45

Explanation / Answer

1. For Total solids(TS),

TS = (Weight of dish plus dried solids - Weight of dish) *1000/ (sample volume)

[1000 to convert ml to lit]

TS = (85.490-85.337)*1000*1000/85 = 1800 mg/l

[1000 mulity to covert g into mg ]

b. For Total suspended solid (TSS)

TSS = (Weight of filter disk plus dried solids - Weight of disk) *1000/ (sample volume)

TSS = (0.153 - 0.14)*1000*1000/200 = 65 mg/l

c. Total dissolved solids (TDS)

TS = TDS + TSS

Using values from a, b

TDS = 1735 mg/l

d. For volalite solids,

Volalite solids(VS) = 1000* (Weight of dish plus dried solids - Weight of dish plus ignited solids)/ (sample volume) ....Eq.1

% of total = VS/Total quantity *100 .....Eq.2

Fixed solids (FS) = 1000* (Weight of dish plus ignited solids - Weight of dish) *1000/ (sample volume)...Eq.3

% of total = FS/Total quantity *100......Eq.4

Above equation 1 to 4 will be used to calculate volatile and fixed solids of each solid fraction,

For total solids,

VS = (85.490-85.375)*1000*1000/85 = 1352.9 mg/l

% of total = 1352.9 /1800*100 = 75.16%

FS = (85.375-85.337)*1000*1000/85 = 447.05 mg/l

% of total = 447.05/1800*100 = 24.84%

For suspended solids,

VS = (0.153-0.1426)*1000*1000/200 = 52 mg/l

% of total = 52/65*100 = 80 %

FS = (0.1426-0.14)*1000*1000/200 = 13 mg/l

% of total = 13/65*100 = 20 %

For total dissolved solids,

VS for TDS = VS for TS - VS for TSS = 1352.9- 52 = 1300.9 mg/lit

% of total = 1300.9/1735*100 = 74.98 %

FS for TDS = FS for TS - FS for TSS = 447.05 - 13 = 434.05 mg/lit

% of total = 434.05/1735*100 = 25.02 %

total Volatile Fixed mg/l mg/l % of total mg/l % of total Total solids 1800 1352.9 75.16 447.05 24.84 Suspended solids 65 52 80 13 20 Dissolved solids 1735 1300.9 74.98 434.05 25.02

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