EFFLUENT TREATMENT

Effluent Treatment Sector Overview:

Effluent treatment plants are a basic necessity for all industries to ensure that the waste they produce is treated correctly and does not end up causing pollution. The effluent treatment market in India stood at around USD 2.4 billion in 2019, as per NITI Aayog and is expected to reach USD 4.3 billion by 2025 due to the increasing demand of municipalities and industries.

India’s effluent treatment sector is classified based on the equipment type used and the end-user industry. The first category will detail the treatment process, control equipment and pumps used. At the same time, the second category will have users like municipal bodies, types of industries and commercial sectors. The fundamental operations remain the same for each type, but the equipment and technology used will vary.

All cities and towns in India are now equipped with effluent treatment plants on a major or minor scale. However, depending on the volume of the water to be treated, the size of the plant and the treatment technology vary. In the last few years, the focus has been on growing the sewage treatment capacity, which has spiked the demand in the effluent treatment sector. This demand will likely rise in the coming years, given the rapid urbanisation.

Use of Pumps in the Effluent Treatment Sector:

Pumps form the heart of the effluent treatment plants as they drive the wastewater through various processes. Starting from collecting effluent water from residential, commercial and industrial complexes, pumps help in pushing the water through multiple processes like screening, treatment and discharge.

As the wastewater generally is accompanied by suspended solid waste, the pumps used in the effluent treatment sector must ensure they can handle them. Screens are used to filter out solid waste. In addition, the pumps used in the treatment process must be good at handling liquids with high viscosity and corrosion resistance.

Centrifugal pumps prove to be the best bet for the effluent treatment sector. Many industries use variations of these pumps either in terms of the pumping technology or the material of the pump. This depends on the type of application and the pump environment. Screw pumps or progressive cavity pumps working on the positive displacement principle are also used in various applications such as dirty water, sewage, sludge cake, activated sludge, bio-sludge etc.

Pump Applications in the Effluent Treatment Sector:

WASTEWATER SLUDGE TREATMENT

Pumps are used in the preliminary stage to collect the wastewater and screen the major solid waste components. This increases the overall efficiency of the treatment plant, and disposed waste can be used for biogas or compost processing.

PRIMARY TREATMENT

The first treatment stage of effluent involves dissolved air flotation and gravitational thickening processes, which help remove around 50% of suspended solids. Pumps are used to drive the water and also discharge compressed air in the process.

ACTIVATED SLUDGE PROCESS

The second treatment stage comprises both anaerobic and aerobic biological processes. The latter needs air to be blown in the liquid using pumps which help maximize the conversion of solid waste into biomass, which can be further utilized.

DEWATERING PROCESS

Even after all these treatment steps, the sludge contains over 70% water, which is removed through various stages of the dewatering process. Pumps are used for the transfer of sludge and the addition of different treatment chemicals in it.

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