Introduction
In many industrial clusters across India, common effluent treatment plants (CETPs) have been established, and are currently in use. They help small-scale industrial facilities that cannot afford separate treatment plants, by lowering the cost of effluent treatment, improving collective treatment, and decreasing land costs. For further cost reduction and to increase plant efficiency, pre-treatment is required in Common Effluent Treatment Plants.
What are the importance of pre treatment in CETP?
Common effluent treatment plants (CETPs) are specialized systems for treating wastewater, produced by small-scale industrial enterprises in an industrial cluster. Small-scale industrial facilities are particularly affected by the challenges, which individual effluent treatment plants (ETPs) typically confront due to a lack of space, resources, capital expense, and specialised labour, for operation and maintenance. These issues are minimised, by treating effluent from numerous small-scale plants collectively at one location, where the effluent receives a comparable level of care.
In terms of land conservation, better care at one location, simplicity of operation and maintenance, and shared costs, this is beneficial! Since CETPs are made to collect and treat effluent from numerous facilities, they may also have to deal with effluent of varied types and amounts.
Importance of pre-treatment in common effluent treatment plants
In the beginning, CETPs were merely sinks for raw industrial effluents. These suffered from a lack of discipline in pre-treatment at the industries, as well as, from a lack of scientific understanding of the intricate characteristics of waste stream collection, segregation, and corresponding treatability studies, particularly in areas where a variety of products were manufactured. As a result, inlet effluent criteria were introduced, with the idea that CETP facilities would remove suspended particles, and biodegradable material.
Secondly, any biological system requires constancy in the calibre of the influent. Therefore, additional pre-treatment facilities might be built on the CETP's property. In any event, the protective standards for the pipeline and tanker collection systems must be met, by the effluent from each industry. Therefore, pre-treatment is a more dependable relief in CETP operation and maintenance (O&M), in the case of diverse industrial complexes.
What are the Pre-treatment requirements?
Industrial process effluent must undergo some sort of pre-treatment, before being sent to the CETP for additional treatment. This is mostly necessary when wastewater is transported through gravity lines, in order to reduce corrosion and clogging, and to prevent decreases in the efficiency of the biological treatment process, caused by hazardous elements.
Pre-treatment requirement for sulphate and sulphide
The purpose of pre-treatment requirements for sulphides, sulphates, and pH is to prevent the corrosion of concrete components in gravity pipelines, as well as the anaerobic conditions that cause hydrogen sulphide to form and cause fire mishaps. To avoid pipeline clogging, limits for the discharge of oil, grease, grit, and heavy sediments are set. Limits on hazardous organics and heavy metals, would guarantee effective biological treatment, and prevent the build-up of pollutants, in leftover sludge.
Standards for inlet effluent quality
Standards are prescrib?ed for inlet effluent quality for CETPs. The inlet effluent standards are given below:
Parameter |
Concentration |
pH |
5.5 - 9.0 |
Temperature (oC) |
45.0 |
Oil and grease |
20.0 |
Cyanide (as CN) |
2.0 |
Ammonical nitrogen(as N) |
50.0 |
Phenolic compounds (as C6H5OH) |
5.0 |
Hexavalent Chromium |
2.0 |
Total chromium |
2.0 |
Copper |
3.0 |
Nickel |
3.0 |
Zinc |
15.0 |
Lead |
1.0 |
Arsenic |
0.2 |
Mercury |
0.01 |
Cadmium |
1.0 |
Selenium |
0.05 |
Fluoride |
15.0 |
Boron |
2.0 |
Conclusion
Any treatment plant's effectiveness, particularly a CETP, depends on both tight adherence by member facilities, and the plant's ideal design and operation.
Best Manufacturer of Common Effluent Treatment Plants in India - Netsol Water
In order for the business to meet the needs and expectations of its clients and consumers, we have a team of highly qualified and experienced specialists, who supervise all aspects of quality. We make sure that proper pre-treatment is provided in Common effluent treatment plants. In addition to taking your calls and talking with you about your concerns, we are also dedicated to making sure that your effluent treatment is always reliable.