Mangaluru refinery, fertiliser and cashew effluent
How Mangaluru's refinery, fertiliser, chemical, cashew and seafood units treat their wastewater on a rain-heavy coast, and which polymer suits each.
A coast of mixed industry
Mangaluru combines a large refinery and petrochemical complex, fertiliser and chemical plants near the port, and hundreds of cashew and seafood processing units across the district.
Refinery and petrochemical wastewater
Oily wastewater passes through API separators and flotation before biological treatment. Cationic grades such as Cationic HQ help gather fine oil and suspended solids in the flotation stage.
Fertiliser and chemical plants
These plants produce effluent with dissolved salts and fine inorganic solids. After pH correction and coagulation, an anionic grade settles the precipitate.
Cashew processing
Cashew units produce effluent from soaking and boiling raw nuts, carrying organic matter and the dark, acidic liquid from the shell. Coagulation followed by a cationic polymer helps clarify it before further treatment.
Monsoon raw water
Coastal Karnataka receives heavy monsoon rain. Raw water from the Netravati turns turbid quickly, so treatment plants should jar-test often and adjust the anionic dose.
Regulation and supply
Units are regulated by the Karnataka State Pollution Control Board. Road freight from Chennai usually takes about two days.
A season and a monsoon plan
Mangaluru's cashew and refinery effluents are different problems on the same coast. Cashew effluent is a strong organic load from shell liquid and boiling water; refinery water carries oil and fine solids. Keep a separate dose table for each, because a number that works for one will not work for the other.
The monsoon adds a second variable. Heavy rain dilutes open clarifiers and brings in grit, so check the dose after a downpour and keep a jar-test kit on site.
Road freight from Chennai via Bengaluru and Hassan covers about 710 km and takes about two days. Order before the monsoon, and store bags off the floor, sealed, in a dry store.
Sources: ASTM D2035-19, Coagulation-Flocculation Jar Test of Water.
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