A Sewage Treatment Plant (STP) is a vital infrastructure designed to purify wastewater, making it safe for discharge into the environment or reuse. It employs a series of physical, chemical, and biological processes to remove pollutants and contaminants from sewage.
At Ishan Paryavaran Pvt. Ltd., we are dedicated to pioneering environmental solutions, and our Sequential Treatment Plant (STP) exemplifies our commitment to sustainable sewage treatment. Crafted with precision engineering and advanced technology, the Ishan STP redefines wastewater management, offering unparalleled efficiency, reliability, and environmental preservation.
Pre-Treatment: Raw sewage enters the STP plant and undergoes preliminary treatment, which involves the removal of large objects, such as debris, plastics, and grit, through screening and grit chamber processes.
Primary Treatment: The pre-treated sewage then flows into primary settling tanks, where heavy solids settle to the bottom as sludge, and lighter materials float to the surface as scum. Mechanical scrapers or skimmers remove these layers for further processing.
Biological Treatment: The partially treated sewage moves into biological treatment units, such as activated sludge or trickling filters, where microorganisms break down organic matter present in the sewage into simpler, harmless substances through aerobic or anaerobic digestion processes.
Secondary Clarification: After biological treatment, the sewage undergoes secondary clarification, where remaining suspended solids and biological sludge settle out in settling tanks. Clear effluent rises to the top and is separated from the settled sludge.
Tertiary Treatment: In some advanced STP plants, tertiary treatment processes such as filtration, disinfection (chlorination, UV treatment), and chemical precipitation are employed to further polish the effluent, ensuring it meets stringent water quality standards.
Effluent Discharge or Reuse: The treated effluent, now substantially free from pollutants and contaminants, is either discharged into receiving water bodies like rivers or oceans, or reused for non-potable purposes like irrigation, industrial processes, or groundwater recharge, depending on local regulations and requirements.
Settling Tanks: These tanks facilitate the separation of solids from liquid sewage through gravitational settling. Primary settling tanks remove heavy solids during primary treatment, while secondary settling tanks allow for further settling of biological sludge during secondary clarification.
Aeration Units: Aeration tanks provide oxygen to support aerobic microbial activity, crucial for the biological breakdown of organic pollutants. These units can utilize diffused aeration systems or mechanical aerators to ensure proper oxygenation of sewage.
Bioreactors: These chambers contain cultures of microorganisms that metabolize organic matter present in sewage. Bioreactors come in various configurations, such as activated sludge systems, trickling filters, or sequencing batch reactors, depending on the treatment requirements and plant design.
Chemical Dosing Systems: Chemicals such as coagulants, flocculants, and disinfectants are dosed into the sewage to enhance the removal of contaminants and pathogens. Chemical dosing systems ensure proper mixing and distribution of these chemicals for effective treatment.
Effective Pollution Control: STP plants efficiently remove pollutants and contaminants from sewage, reducing the environmental impact of wastewater discharge and protecting water quality in receiving water bodies.
Compliance with Regulations: By meeting regulatory standards for effluent quality, STP plants help communities and industries adhere to environmental regulations and avoid fines or penalties associated with non-compliance.
Resource Recovery: Through processes like sludge digestion and biogas production, STP plants can recover valuable resources from sewage, such as methane gas for energy generation and nutrient-rich biosolids for soil amendment.
Public Health Protection: By treating sewage to remove pathogens and harmful substances, STP plants contribute to public health by minimizing the risk of waterborne diseases and contamination of drinking water sources.
Have other questions?
Industrial, municipal, and commercial facilities - including food & beverage, textiles, automotive, pharma, real estate, and institutions.
RO/UF systems, STP/ETP, DAF/clarification, sand & carbon filters, softeners, sludge handling (screw press/belt filter press), and AMC/O&M services.
We test your raw water/effluent, review consumption & discharge targets, then design to flow (m³/day), peak factors, space, and compliance norms.
Yes - designs are engineered to the required parameters (BOD/COD, TSS, pH, oil & grease, nutrients as applicable) with documented test reports at handover.
Daily flow, peak flow, inlet water/effluent analysis, desired outlet quality, available footprint, utilities (power/air), and any reuse/disposal plan.
Skid RO/filters: 3–6 weeks. Medium STP/ETP: 8–14 weeks (design, fabrication, civil readiness, erection/commissioning). Timelines vary by scope.
Our story is one of unwavering dedication to safeguarding one of the world’s most precious resources.
Our Mission is to make Pollution Free Water
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