Vijayawada river water and agro effluent: a guide
How Vijayawada's Krishna-fed water works, rice mills, dairies, food units and power plants use coagulant and polymer through the year.
Krishna water
Raw water drawn at the Prakasam Barrage changes with the river: low and clear in summer, heavy with silt when floods come down. Clarifiers use a coagulant followed by an anionic grade such as Anionic HQ, with the dose rising with turbidity.
Rice mills
Parboiling rice mills soak paddy in hot water, producing effluent high in organic matter and starch. Settling with a cationic polymer before biological treatment reduces the load on the rest of the plant.
Dairies and food plants
Dairy effluent carries milk solids, fat and cleaning chemicals. DAF or a clarifier with a coagulant and cationic polymer separates the fat and protein; SunMac SC04 offers a liquid option.
Thermal power
Raw water pre-treatment and ash-handling water use anionic grades after the coagulant, keeping cooling and boiler make-up water clean.
Flood season
When the Krishna floods, jar-test raw water daily and keep extra polymer stock, since doses can rise several times over and road delays are more likely.
Regulation and supply
Units are regulated by the Andhra Pradesh Pollution Control Board. Vijayawada is usually one to two days by road from Chennai.
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