Report on Visit to Sewage Treatment Plant STP-II, Dehlawas, Jaipur

Title of the event: Visit to Sewage Treatment Plant STP-II, Dehlawas, Jaipur

Type of Event:           Educational /Industrial Visit  

Date:                           23^rd November 2022  

Venue:                        STP unit-II, Dhelawas, Jaipur

Name of Resource person (if any) with designation, address, email address & contact no.:

No. of Participants/Beneficiaries (Teaching/Students to be mentioned separately): 39(students)+2(faculty)=41

Name of the activity Coordinator: Dr. Neha Batra and Dr. Ameeta Sharma

Name of Collaborating Agency (if any) with address & contact no.: NA

Objective of the activity:

1. To sensitize the participants on Sewage treatment introduction & the importance.

2. To create technical understanding among students that how sewage water is being treated by various methods and stages for useful purposes like irrigation and for energy production and also to acquire knowledge and experience.

Summary/Description:

A Sewage Treatment Plant visit was successfully organized by the Discipline of Biotechnology, IIS (deemed to be University), Jaipur on Wednesday, 23^rd November 2022. Two faculties Dr. Ameeta Sharma and Dr. Neha Batra along with 39 students from stream of PG and UG Biotechnology and Microbiology visited this plant. All commuted via college bus and reached the venue at 10:30 a.m.

All students were introduced and given a briefing of rules and guidelines to be followed by the instructor present. He also explained about the divisions of treatment of sewage water that were Preliminary, Primary, Secondary and Tertiary treatments and their respective strategies. This plant mainly treats the waste water coming from Dravyawati River which is highly contaminated.

Firstly, students were shown how preliminary treatment was carried and how Activated Sludge Waste Water Treatment was being done to remove suspended particles of 20 mm diameter present in water using filters of this particular size. Then, divisions for primary treatment were shown that was comprised of several filters in each compartment to remove particles of diameter of size 7 mm and some of the inorganic and organic materials. The sewage generated from preliminary and primary treatment was dumped in the landfills to degrade biodegradable matter and non-biodegradable matter was being treated by other methods.

In secondary treatment, biological method that was by using bacteria especially aerobic to treat waste water and this was because whole process was being carried out in aerobic conditions. This step was being divided into 3 sub-steps that was filling of water, treatment of water and then decanting of treated water. In the filling process, Ist chamber of secondary treatment was being filled by the waste water that was treated in primary treatment. Then oxygen was being supplied by the pumps which created air bubbles to provide aerobic conditions for the treatment of water and bacteria would utilize the sewage as its substrate and convert it into less harmful product. These two steps were being done simultaneously in one chamber only. The instructor explained to students that why they were using aerobic instead of anaerobic treatment. He explained that in anaerobic treatment, a large amount of methane and carbon-di-oxide would be released and it would be harmful for that area. Then in the III^rd step the clean water was being transferred to another chamber and discarded for further treatment and the remaining sludge in the bottom was being again recycled and treated.

The last treatment was tertiary treatment in which chemicals were being used to treat the water. Especially chlorine was being used for cleaning purpose of water in that plant. Water was being passed from several chambers containing chlorine and the treated water was being collected in a separate chamber and could be used for several purposes.

There were 3 fixed dome type biogas plants where biomass generated from each step of treatment was being an-aerobically treated to produce energy and even the light facilities of that plant and nearby areas were being supplied by that biogas produced from those biogas plants. The instructor explained students about the cost of that plant and that was about 230 crores and even the mirror image of that plant was under construction so that more waste water would be treated and could be used for several purposes.

In the end there was a discussion related to treatment methods being employed in the plant and students enthusiastically participated in it. Over all it was a learning experience for all students and faculty members.

Outcome of the activity/event/seminar/workshop: Participants were benefitted in variety of ways like and the outcome was very fruitful for all:

1. They became aware on STP methods and types

2. They became aware about the steps involved in treating the waste water, in treating the generated sludge, how the gases released by the plant were being utilized for useful purposes and how microorganisms were being utilized for treating waste water and most importantly the value of water.

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