Title: Treatment of harvest discharge from intensive shrimp ponds by settling
Abstract: Effluent from intensively managed shrimp ponds was examined during harvest when ponds were drained. Concentrations of nutrients and solids in effluents were significantly higher during the final 20 cm of discharge (16% of pond volume), but greatest increases occurred during the final 5 cm of discharge (3.9% of pond volume). When the final 20 cm of pond discharge was allowed to settle, near maximum sedimentation for most variables occurred within 6 h. Settling removed total nitrogen less effectively than other nutrients. Within 6 h, 100% of settleable solids, 88% of total suspended solids, 71% of volatile solids, 63% of biochemical oxygen demand (BOD), 31% of total nitrogen and 55% of total phosphorus had sedimented from the final 20 cm of effluent. For the total pond this represented 61% settleable solids, 40% total suspended solids, 24% total volatile solids, 12% BOD, 7% total nitrogen, and 14% total phosphorus. Of the total amount removed during settling, 61% of settleable solids, between 18 and 26% of BOD, nitrogen and phosphorus, and between 34 and 45% volatile and suspended solids were found in the final 20 cm of discharge (16% of pond volume). A simple treatment of pond effluents at harvest can be effected by shunting the last 10–20% of discharge through a settling pond with no more than 6-h of residence.
Publication Year: 1999
Publication Date: 1999-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 70
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