ETP & STP Chemicals, Bacteria Culture Supplier India

Zyax supplies the full set of chemicals and bacteria culture for effluent treatment plants (ETP), sewage treatment plants (STP) and common effluent treatment plants (CETP). From primary treatment to the outlet, we help plant operators meet discharge norms with fewer upsets, less foam and drier sludge.

Get a quote WhatsApp us Call +91 87792 40420

Manufacturer & supplier, Mumbai
Send your water report, get a product recommendation
Bulk packs, delivered across India

Effluent and sewage treatment plant with aeration and clarifier tanks

Range: PAC and alum, cationic and anionic polyelectrolyte, PolyDADMAC, bacteria culture, nutrients, defoamers, lime and caustic for pH, sodium hypochlorite, SMBS
Used in: Housing society and commercial STPs, industrial ETPs, CETPs, hotels, hospitals, malls, IT parks
Forms: Powders, liquids and bacteria culture in powder or liquid form
How we help: Share your inlet and outlet results (COD, BOD, TSS, pH, oil and grease) and we suggest what to change

Which chemicals does an ETP or STP need?

Every treatment plant follows roughly the same path: remove solids, break down the dissolved organic load with bacteria, separate the sludge, polish and disinfect the treated water. Each stage has its own chemicals:

Stage	Problem it solves	Chemicals used
Equalisation and pH correction	Acidic or alkaline effluent upsets biology	Hydrated lime, caustic soda, acids
Primary treatment (physico-chemical)	Suspended solids, colour, oil and grease, phosphorus	PAC, alum, PolyDADMAC and anionic polyelectrolyte
Biological treatment (aeration, MBBR, SBR, MBR)	High COD and BOD; slow or failed start-up; bacteria lost after shock loads	Bacteria culture, nutrients (nitrogen and phosphorus)
Foam control	Foam overflowing aeration tanks and blowers	Defoamers and antifoam
Secondary clarification	Poor settling, cloudy outlet	Coagulant and polyelectrolyte
Sludge dewatering	Wet sludge, high disposal cost	Cationic polyelectrolyte
Tertiary treatment and reuse	Residual turbidity, smell and colour	Sand filter media, activated carbon
Disinfection	Bacteria in treated water used for flushing or gardening	Sodium hypochlorite, chlorine tablets
Dechlorination	Excess chlorine before discharge or RO	Sodium metabisulphite (SMBS)

Bacteria culture for ETP and STP

The heart of most treatment plants is a tank full of bacteria that eat the organic load (measured as BOD and COD). When a plant is new, after a shutdown, or after toxic or shock loads, that population is too small or has died off. Adding a concentrated bacteria culture (bio-culture) re-seeds the tank so it recovers quickly.

Bacteria culture is used to:

Start up a new STP or ETP faster than waiting for natural growth.
Recover after a shock load, chemical spill, power failure or long shutdown.
Improve COD and BOD removal and reduce odour in plants that run below design.
Break down fats, oils and grease in kitchen, hotel and food effluent.

Bacteria also need food in the right balance. Many industrial effluents lack nitrogen or phosphorus, so a nutrient supplement may be needed alongside the culture. Keep dissolved oxygen, pH and temperature in range, or the culture will not survive.

Common plant problems and what helps

What you see	Likely cause	What usually helps
High COD or BOD at the outlet	Too few active bacteria, overload, low oxygen	Bacteria culture, nutrients, check aeration and retention time
Thick white or brown foam on aeration tank	Detergents, surfactants or filamentous bacteria	Defoamer for quick control; find and fix the cause
Sludge does not settle, cloudy outlet	Bulking sludge, poor flocculation	Coagulant and polyelectrolyte; check sludge age and oxygen
Wet sludge from filter press or screw press	Wrong polyelectrolyte grade or dose	Trial cationic polyelectrolyte grades
Bad smell	Low oxygen, septic conditions, sludge build-up	Improve aeration, remove excess sludge, bacteria culture
Colour in textile or dye effluent	Dyes not removed by biology	PolyDADMAC or other decolourising coagulant, activated carbon

How to get the right chemicals for your plant

Send your lab results: inlet and outlet COD, BOD, TSS, pH, oil and grease, and the discharge norms you must meet.
Tell us about the plant: type (ETP or STP), capacity in KLD, technology (MBBR, SBR, ASP, MBR) and current chemicals.
Describe the problem: foam, smell, poor settling, wet sludge, outlet failing norms.
Get our recommendation: which chemicals to use, where to dose them and in what pack sizes.

Who we supply

Housing societies and townships
Hotels and resorts
Hospitals
Malls, offices and IT parks
Pharma and chemical units
Textile and dyeing
Food, dairy and beverage
Paper and pulp
Automobile and engineering
CETPs
STP and ETP operation and maintenance contractors

Grades and specifications

Typical values for each grade we supply. Technical data sheet and safety data sheet available on request.

COD and BOD reduction chemical

Removes particle-bound COD before biological treatment so the aeration stage works more efficiently.

HS code	38249022

Ask for data sheet and quote →

Odour control chemical

Absorbs and neutralises sulphides, mercaptans, ammonia and amines at STPs, ETPs, sumps and sludge areas.

HS code	38249022

Ask for data sheet and quote →

ETP & STP Chemicals: product range

Each product line has its own page with uses, dosing guidance and FAQs.

Frequently asked questions

What chemicals are used in an STP?

An STP typically uses bacteria culture to start or recover the biological process, a coagulant such as PAC and a polyelectrolyte for settling and sludge dewatering, a defoamer for foam, and sodium hypochlorite to disinfect treated water. Lime or caustic soda may be needed for pH correction.

What chemicals are used in an ETP?

It depends on the industry, but most ETPs use pH correction chemicals, coagulants (PAC, alum or PolyDADMAC), polyelectrolytes, bacteria culture and nutrients for biological treatment, defoamers, and disinfection or dechlorination chemicals.

What is bacteria culture in STP?

Bacteria culture (bio-culture) is a concentrated blend of microbes added to the aeration tank to start a new plant, or to recover one after a shutdown or shock load, so the plant removes BOD and COD properly.

How long does bacteria culture take to work?

It depends on the plant, the load, oxygen, pH and temperature. Improvement usually shows over days to a few weeks, not hours. Keeping aeration and pH in range makes a big difference.

Why is there foam in my STP aeration tank?

Foam usually comes from detergents and surfactants in the sewage, from a young or overloaded biological process, or from filamentous bacteria. A defoamer controls it quickly, but the cause should also be checked.

How do I reduce COD in my ETP?

Check that the biological stage has enough bacteria, oxygen, nutrients and retention time, and that primary treatment is removing what it should. Bacteria culture, correct coagulation and good aeration are the usual levers. Share your results and we can suggest next steps.

Which polyelectrolyte is used for STP sludge dewatering?

Usually a cationic polyelectrolyte, because STP sludge is mostly organic. The best grade depends on the sludge and the dewatering machine, so a short trial of two or three grades is worthwhile.

Do you supply chemicals to STP maintenance contractors?

Yes. We supply O&M contractors who run several plants, as well as housing societies and industries that run their own plants.

Can I send my lab report on WhatsApp?

Yes. WhatsApp a photo of your latest lab report to +91 98333 22685 and tell us the plant type and capacity.

Get a quote for ETP and STP chemicals

Tell us what you are treating and how much you use. Send your water or effluent analysis if you have one, and we will recommend the right product and pack size.