ISSN (0970-2083)

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Research Article Open Access

BIOLOGICAL TREATMENT OF AQUACULTURE DISCHARGE WATERS BY SEAWEEDS

Abstract

Treatment with seaweeds confirmed that nutrients from the aquaculture farm discharges could be converted in to seaweed biomass in a laboratory scale treatment experiment Enteromorpha flexuosa removed 87.2% of nitrite 87.2 % of nitrate, 82.5% of ammonia and 84.1% of phosphate and Gracilaria verrucosa removed 94.5% of nitrite 91.4% of nitrate, 99.3% of ammonia and 100% of phosphate from the discharge waters of aquaculture farm in a period of 20 days. Concentration of dissolved oxygen level increased from 4.2 to 5.1 mg/L with E. flexuosa and from 3.3 to 5.1 mg/L in with G. verrucosa. The biomass of seaweed has increased from 20 to 27.1g in the case of E. flexuosa and from 20 to 28.1g in the case of G. verrucosa. With increasing shrimp farming activities considerable quantity of discharge waters, will be generated and that may lead to some negative impacts on coastal and land environment. Biological treatment system is the best of all the treatment systems for a tropical country like India because of low cost and simple operations.

I. RAJARAJASRI PRAMILA DEVI and V.S. GOWRI

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