BlueDrop Enviro

Constructed Wetlands

BlueDrop’s Enviro’s technology for sewage wastewater treatment is known as Constructed Wetlands or Phytoremediation.

Bluedrop Enviro’s quality and reliable experience in the practice of wastewater treatment with about 200 years of collective experience and over 1250 successful implementations across the world in about 32 countries ranging from 1 KLD to 350 MLD, offer proven solutions to meet any specific requirements.

Aerated Wetlands by BlueDrop are based on ‘scientifically developed & patented’ Forced Bed AerationTM and customised for Indian subcontinent.

What are Constructed Wetlands?

Constructed wetlands (CWs) are Built-in an upland area (with or without aquatic plants) principally or entirely for wastewater treatment. The treatment involves myriad pollutant removal mechanisms such as microbial, biological, physical and chemical processes.

Constructed Wetland STPs/ ETP

CWs is a natural treatment process with high-rate biological activity that helps in removing pollutants from wastewater of different sources and strengths. It removes and recycle nutrients, filter pollution, remove sediments and produce oxygen during the treatment process. Thus improves the water quality. CWs is a green technology with effective treatment efficiency, no odour, no environmental nuisance, low energy consumption, no harmful gases and by products, no usage of chemical and a sustainable treatment system for the treatment of industrial wastewater.

CWs has been used to remove nutrients from agricultural run-off and removal of non-point source pesticides from surface water bodies. CWs has a wide range of application for the treatment of different industrial wastewater such as wineries, breweries, fish & shrimp aquaculture, effluents from dairy, meat, vegetable, soft drinks, sugar mill, textiles, tanneries industries, landfill leachate and mine drainage wastewater.

Benefits of CW

There are numerous benefits of using CWs over conventional wastewater treatment systems. To list a few…

  • Environmentally Friendly
    • Low carbon footprint
    • Carbon sequestration
    • Low greenhouse gas emissions
  • Low Energy so least energy costs
  • Easy to build and easy to operate
  • Significantly Low O&M costs compared to conventional systems
  • Very long effective life
  • Efficient nutrient removal /absorption capacities

Some of our Projects

Designed & Implemented and Working Successfully


Aerated constructed Wetland integrated with landscaping was installed to handle the domestic wastewater to the capacity of 2.4 MLD.

CII - Indian Green Building Council (IGBC)

Capacity of 5 KLD, The plant receives wastewater from offices.

Telangana State Industrial Infrastructure Corp. Ltd.

Capacity of 30 KLD. The plant receives wastewater from multiple industries, The inlet wastewater has a BOD, COD and TSS of 350, 700 and 250 mg/L.

Deccan Cements Ltd, capacity of 1.2 MLD

The plant receives wastewater from residential complexes and effluent from cement industry, The inlet wastewater has high pH and Total Dissolved Solids.

Bangalore Water Supply and Sewerage Board

Plant capacity of 500 KLD, receives wastewater from communitiesinlet wastewater has a BOD, COD and TSS of 150, 150 and 125 mg/L.

National Industrial Security Force

Capacity of 200 KLDinlet wastewater has a BOD, COD and TSS of 90, 290 and 48 mg/L.

RR Ispat

Capacity of 60 KLD, the inlet wastewater has a BOD, COD and TSS of 125, 150 and 125 mg/L, A Passive Hybrid Sub-Surface Flow Constructed Wetland was installed.

University of Hyderabad

The system can handle the domestic wastewater to the capacity of 50 KLD

Bhuj Coaching Depot

The system can handle the domestic wastewater to the capacity of 24 KLD, The plant receives wastewater from Pit line and Coach wash water

Mahabubnagar Municipality

Capacity of 10 KLD, The plant receives wastewater from Municipal Nallah, The inlet wastewater has a BOD, COD and TSS of 150, 175 and 15 mg/L.

GreenPark Hospitality Services

Capacity of 60 KLD, The plant receives wastewater from Central Kitchen, The inlet wastewater has a BOD, COD and TSS of 900, 6000 and 400 mg/L

HPCL- LPG bottling Plant

Has a capacity of 10 KLD, This project was implemented for removing iron, ethyl mercaptan & dirt from the wastewater which is coming from cylinder's wash water.

HPCL- Terminal Loni

Capacity of 3 KLD., The plant receives wastewater from multiple industries.

GITAM University

BlueDrop Enviro has retrofitted the STP in this project, The system can handle the domestic wastewater to the capacity of 300 KLD.

Types of Constructed Wetlands

There are several types of CWs. Based on oxygen transfer mechanism; there are two types of CWs:

  • Passive wetland systems rely on the diffusion of the oxygen from the air into the water column, which is a very slow process. This lack of oxygen transfer slows the removal of oxygen compounds and limits the removal of Ammonia from the wastewater.
  • Aerated Wetlands rely on the ability to inject small quantities of air in a very uniform pattern throughout the bed. This allows the controlled operation over the entire oxidation process during wastewater treatment while only using a small amount of energy for its operation.

Aerated wetland system (AWs) was developed and patented with trade mark of Forced bed aeration. These are advanced version of CWs that are more efficient in removing wide range of pollutants such as organic matter, suspended solids, nutrients such as nitrogen and phosphorus, pathogenic micro-organism, heavy metals, emerging contaminants and microplastics.

Application of Aerated wetland Systems

Aerated Wetland Systems has a wide range of application such as treatment of Municipal wastewater, effluent from different industries such as textile, dairy etc. , treatment of landfill leachate, effluents from hospitals, chemical laboratories.

What are the benefits of aerated Constructed Wetlands?

Aerated Wetlands have been in use for over 20 years in Europe and North America, advances such as wetland aeration have allowed the technology to be adapted in India, where the favourable climate allows for maximum benefits. In UK, more than 50% of the non-operational passive CW system has been retrofitted to aerated CW system.

The major driving force behind this move has been increased treatment capacity with same footprint, capital asset, mitigated risk of clogging and extended life span. Further other vital advantage is the flexible aeration flow adjustments as per requirements which eases in tackling fluctuating biochemical oxygen demand and nitrification loads especially due to weather based events (Nivala et al., 2020).

How does Aerated Constructed Wetlands work?

The wastewater flows beneath the surface of media which is aerated using air distribution system that increases the availability of oxygen in the system that further enhances the treatment performance of the system.

Due to continuous supply of oxygen from the root zone of specific macrophytes further reduces the cost of energy and maintain the dissolved oxygen concentration throughout the treatment process.

Moreover, due to continuous oxygen transfer enhances the removal of organics, nutrients and other pollutants from the system. The type of macrophytes selected provides high removal efficiency due to the proliferation of microbes and provides an aesthetical view in the surrounding of the system. AWs are the flexible system and can be customize based on the on the strength and source of effluent as a primary, post, and hybrid treatment system.

Is Aerated wetlands better than Passive wetlands?

The aeration effectively fuels the aerobic microbial degradation improving treatment capacity by up to 10 times per unit area compared to passively operated systems. Aerated wetlands are 3 to 5 times smaller than conventional passive wetlands. The reduced area saves construction costs and means that wetlands can be used in limited land areas. The systems do not produce excess sludge like conventional mechanical treatment plants and only use about 10% of the energy required for a comparable activated sludge process.

Hence, the ‘Total Cost of Ownership’ (TCO) of Aerated Wetland Treatment systems is quite lower compared to conventional mechanical systems in longer term. This TCO is a key factor in evaluating the suitable technology if an organization needs to operate a Sewage Treatment Plant (STP) or Effluent Treatment Plant (ETP) for 15/20+ years.

Application based on different types of sector

CWs are engineered systemsthat utilizes the natural components such as plants, soil and microorganism in order to treat wastewater. Here the systems are designed in replication to natural treatment system but worked in a controlled condition. The treatment system which serve the purpose of treating waste from different sectors such as Residential, Industries and Educational Institutions.