Wastewater Treatment Plant Case Study

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The wastewater treatment plant (WWTP) of Amul effluent treatment plant, Dist. Anand having capacity to treat 400 KL/day of wastewater. A general systematic flow diagram of WWTP is shown in figure. The system was designed to handle to treat wastewater having high organic content and suspended solids.
The heart of the system is Aerobic biological reactor. The system was designed to handle BOD at 20°C of 800 mg/L and Suspended Solids (SS) 250 mg/L. The various point sources of wastewater is collected in a combined underground sewer and conveyed to the effluent sump, equalization take place, than feed the wastewater into the subsequent units. Than effluent
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Phosphorus is generally done to control eutrophication. Treatment plant effluent discharge limit have ranged from 0.10-2.5 mg/L. In the biological removal of phosphorus in the influent wastewater is incorporated into cell biomass, which subsequently is removed from the process as a result of sludge wasting. Phosphorous reduction in WWTP was observed to be 83%.

Waste water treated by UASB:
Parameter ETP tank Equalization UASB Final outlet
PH 8.82 8.50 12 7.8
Temperature 33 32 29 28
Total dissolved salts 2028mg/l 1812 mg/l 1835 mg/l 1792 mg/l
Total suspended solids 1268 mg/l 742 mg/l 372 mg/l 18 mg/l
Oil and grease 198 mg/l 32 mg/l 10.8 mg/l 5.6 mg/l
COD 5790 mg/l 4820 mg/l 1540 mg/l 74 mg/l
BOD 2480 mg/l 1792 mg/l 552 mg/l 22 mg/l
Chloride 570 mg/l 460 mg/l 372 mg/l 330 mg/l

The BOD value is usually is not allowed to be higher than 300mg/l.
These method is cheap rather than easy to perform, does not require highly sophisticated techniques and can be applied because of usually low pollution strength of produced waste
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The potential risk of health hazard due to bacteria and viruses to farm workers and consumers.
Further survival of bacteria and virus in the soil are governed by several environmental fractions viz. soil, pH, cations, soluble organics, moisture, organic matter and temperature. Thawale et al. (2006) studied the survival of pathogens in the soil irrigated with different types of wastewater. Survival of different pathogens in soil and crops are reported in table 4.11. The result indicated the degree of health hazard was more in the use of untreated and primary treated wastewater. However, survival oforganisms was insignificant in case of secondary treated wastewater.
Table 4.11: Survival of pathogens in soils
Pathogen Survival in days Coli forms 38 Streptococci 38 to 63 Faecal streptococci 26 to 77 Salmonellae 15 to > 280 Enteroviruses 8 to

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