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Sewage Treatment Plants (STP)


‘Sewage’ is generated by residential, institutional, commercial and industrial establishments. Apart from wastewater generated by the process, it also includes waste liquid from toilets, baths, showers, kitchens, and sinks draining into sewers.

‘Sewage Treatment’ is the process of removing contaminants from wastewater using physical, chemical and biological processes. The output water or the recovered water is safe for the environment. What remains is a semi-solid waste called sewage sludge which is further treated to make it suitable for disposal.


Austro Water Tech has 25 years of experience in designing and building advanced Sewage Treatment Plants. Having a proven expertise in 1,200 installations, we stand as pioneer and industry leader in this wastewater processing industry.

We help companies meet stringent Sewage Treatment requirements at a cost-effective price point using advanced technology components. Austro Water Tech’s advanced Sewage Treatment Plants ensure that the wastewater streams are treated well within the recommended parameters and at the end you have safe water that can be discharged.


Sewage can be treated at the site where sewage is generated or at a centralized treatment plant.
Pretreatment is where large objects, grit, fat and grease are removed to ensure the downstream treatment stages operate at the desired efficiency levels. With the help of a bar screen, materials such as trash, tree limbs, leaves, branches, and other large objects are removed from the raw sewage to prevent any damage or clog the pumps and sewage lines. Grit such as sand, gravel, cinders, and organic materials are removed using a grit channel or chamber where the velocity of the incoming sewage is adjusted to allow settlement. Grit removal helps reduce formation of heavy deposits in aeration tanks, aerobic digesters, pipelines, channels and protect moving mechanical equipment from abrasion and accompanying abnormal wear. 

Equalization tanks temporarily hold incoming sewage and serve as a means of diluting and distributing batch discharges of toxic or high-strength waste. This is to ensure uniform flow conditions so that the clarifiers and mechanized downstream treatment are efficient. Fat and grease are removed by passing the sewage through a small tank where skimmers collect the fat floating on the surface.

Sewage treatment generally involves three stages: primary, secondary and tertiary treatment.

Primary treatment consists of temporarily holding the sewage in a basin (“pre-settling basins”, “primary sedimentation tanks” or “primary clarifiers”) where heavy solids are allowed to settle to the bottom while oil, grease and lighter solids float to the surface. The settled and floating materials are removed and the remaining liquid is subjected to secondary treatment.

Secondary treatment removes dissolved and suspended biological matter. The biological content of the sewage is degraded by the indigenous, water-borne micro-organisms in a managed habitat. The bacteria and protozoa consume biodegradable soluble organic contaminants and bind much of the less soluble fractions into floc.

Tertiary treatment is sometimes defined as anything more than primary and secondary treatment in order to allow ejection into the environment. It is also called “effluent polishing.”

Media Filtration removes residual suspended matter and residual toxins. Nitrogen is removed through the biological oxidation of nitrogen from ammonia to nitrate (nitrification), followed by denitrification, the reduction of nitrate to nitrogen gas. Phosphorus can be removed by enhanced biological phosphorus removal and also by chemical precipitation, usually with salts of iron (e.g. ferric chloride), aluminium (e.g. alum), or lime. Chlorination, Ozonation and Ultraviolet (UV) light are one of many methods to waste water disinfection.

Treated water is disinfected chemically or physically prior to discharge for the use of irrigation of a golf course, green way or park. If it is sufficiently clean, it can also be used for groundwater recharge or agricultural purposes.

Sludge treatment and disposal is an important stage in the sewage water treatment. The purpose of digestion is to reduce the amount of organic matter and the number of disease-causing microorganisms present in the solids. The most common treatment options include anaerobic digestion, aerobic digestion, and composting. Incineration is also used where necessary.


Wastewater Treatment Types
Industries Served in 5 Countries
Textiles ZLD Projects Served
Million MLD Waste Water
Industry Types Served
Years Of Proven Expertise




S. No Client Name Industry Treatment Plant Capacity
1 VSM Weaves India Limited, Erode Weaving STP 100 KLD
2 S.S.M. Engineering College, Dindigul Engg. College STP 300 KLD
3 Prassanna Spinning Mills, Dindugal Spinning STP 300 KLD
4 Sudhan Spinning Mills – Unit II, Dindigul Spinning STP 300 KLD
5 Velayuthasamy Spinning Mills unit-II, Vedasanthur Spinning STP 200 KLD
6 Shanmugavel Spinning Mills, Vedasanthur Spinning STP 150 KLD
7 Shivaraj Spinning Mills, Vedasandur Spinning STP 150 KLD
8 Lucky Spinning Mills, Erode Spinning STP 150 KLD
9 Adisankara Spinning Mills, Vedasanthur Spinning STP 100 KLD
10 Velauthasamy Spinning Mills unit-I, Vedasanthur Spinning STP 100 KLD
11 Velauthasamy Weaving, Vedasanthur Weaving STP 100 KLD
12 Vedha Spinning Mills, Vedasanthur Spinning STP 100 KLD
13 Sudhan Spinning Mills, Vedasanthur Spinning STP 100 KLD
14 Kaniska Garments, Tirupur Dyeing STP 100 KLD
15 Gateswear, Tirupur Garment STP 100 KLD
16 Core Carbons P Ltd, Palladam Carbon STP 100 KLD
17 Jesus redeems, Nalmavadi Institution STP 100 KLD
18 Shahi Expots, Mysore Garment STP 100 KLD
19 Poomer Spinning Mills Washing/Printing STP 100 KLD
20 Shahi Exports Pvt Ltd, Bhuvaneshwar Washing STP 100 KLD
21 Senthil Kumar Textile Mills, Erode Spinning STP 75 KLD
22 Sri Vari Textiles, Dindigul Spinning STP 25 KLD
23 Adithya Birla, Bangalore Washing, Denim STP 90 KLD
24 Radhamani Exports Limited, Jigini, Bangalore Washing, Denim STP 80 KLD
25 Velauthasamy Kalyana Mandabam, Tirupur Banquet Hall STP 50 KLD
26 Spring Mountain Public School, Tirupur Education STP 50 KLD
27 Shahi Expots, Krishnagri Garment STP 40 KLD
28 Bannari Amman Spg. mills ltd, Dyeing STP 40 KLD
29 Bannari Amman Spg. mills ltd, Dyeing STP 20 KLD
30 Page Industries Limited, Hasan Dyeing STP 15 KLD
31 Jayakumaran Exports Garments STP 15 KLD
32 Shivaraj Spinning Mills, Vedasandur Spinning STP 10 KLD
33 Page Industries Limited, Hasan Dyeing STP 15 KLD
34 Jayakumaran Exports Garments STP 15 KLD
35 Senthil Kumar Textile Mills, Erode Spinning STP 75 KLD
36 Sudhan Spinning Mills – Unit II, Dindigul Spinning STP 300 KLD
37 Sri Vari Textiles, Dindigul Spinning STP 25 KLD
38 Shahi Exports Pvt Ltd, Bhuvaneshwar Washing STP 100 KLD
39 VSM Weaves India Limited, Erode Weaving STP 100 KLD
40 Senthilkumar Textile Mills Dyeing STP 75 KLD
41 Page Industries Limited Dyeing STP&DTP,RO 10 KLD &30 KLD
42 Shahi U-46 Garments STP 30 KLD
43 Vedha Spinning Mills (P) Ltd., Spinning STP & RO 1000 LPH
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