Thiruvananthapuram water works and STPs: a guide
How Thiruvananthapuram's water works handle heavy monsoon turbidity, and how hospitals, campuses and Technopark run their on-site sewage plants.
Two monsoons
Kerala's capital gets rain from both the south-west and north-east monsoons. Raw water from the Karamana river and its dams can change from clear to very turbid in hours, which keeps water works operators busy for much of the year.
Water works dosing
Clarifiers use a coagulant followed by a small dose of an anionic polymer such as Anionic MQ or Anionic HQ. During heavy rain, jar-test several times a day and adjust the dose in steps as turbidity rises and falls.
Hospital and campus STPs
Hospitals, colleges and Technopark buildings run their own STPs. Their excess biological sludge dewaters much better with a cationic grade. Cationic MQ in 10 kg bags suits these smaller plants.
Coastal food and seafood units
Organic, fat-bearing effluent from coastal processing responds to cationic grades. SunMac SC04 is a liquid option for DAF and clarifier support.
Humidity and storage
Kerala's humidity makes opened polymer bags cake quickly. Fold and seal bags after each use, store them off the floor, and buy in sizes the plant uses within a few weeks.
Regulation and supply
Units are regulated by the Kerala State Pollution Control Board. Road freight from Chennai usually takes two to three days.
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