We have a Phyco-remediation ...

We have a Phyco-remediation solution to use the sewage to grow Diatom algae and fish.

If total wastewater flow from 10 households is about 5,000 liters per day ( sewage plus grey water), you would require a pond of about 150,000 liters ( 30 days storage / retention time). The pond can be 2 meters deep, so area would be 75 sq meters.

No equipment or power supply is required, so the pond can be close by or away from the households.

Pond need not be cemented, plastic sheet lining can be used if required.

Natural ponds too can be used.

Capex would be the cost of the pond, sewer pipe to the pond and pumping if required i.e., if gravity flow is not possible.

Land should not be a problem in remote area, so this type of solution may be best suited, rather than an engineered solution requiring power supply, etc.

Diatoms can be grown using our product Nualgi. 1 liter of Nualgi can treat 1 to 2 million liters of sewage, the total cost of Nualgi would be about $ 100 per liter.

If fish can be grown in the pond, the income from sale of fish would help recoup the cost and you may make a profit or the treated water can be used for irrigation.

This can be used together with other technologies, such as

septic tanks - the overflow can go into the ponds for final treatment ;

anaerobic treatment / biogas - the sludge can be put into the ponds to use the nutrients, N and P in the sludge.

The basic principle is that sewage is digested food and contains nutrients, N and P. These should be put to use to grow food, since sewage is mainly water, growing fish is the best solution.