Abstract

LUNA-IMBACUAN, Mónica Alexandra; CAMPOS-BERMUDEZ, Francisco  and  MEDINA-GUTIERREZ, Obeimar. Evaluation of the wastewater from the washing of multipurpose ponds with rainbow trout farming (Oncorhynchus mykiss). Corpoica cienc. tecnol. agropecu. [online]. 2016, vol.17, n.2, pp.191-202. ISSN 0122-8706.

Fish production generates two types of water flow: a continuous one related to the normal operation and an intermittent one associated to the cleaning of the seeding ponds. The multipurpose ponds (multipro) are novel systems that provide advantages compared to conventional design ones, so the recent study searches to was focused to determine the physical and chemical quality and treatability of their washing effluents. The multipurpose ponds (multipro), worked to a real scale, by using initial and final seed densities of 5 kg/m3 and 8.9 kg/m3 respectively. The ponds were cleaned every 72 hours, and different samples were taken to determine the chemical-physical characteristics following the standard methods. The main results show that the effluent from cleaning represents a volume of 1.5 % of the total generated in the normal daily operation. Additionally, the effluent showed average values of 128 mg/L of total suspended solids (TSS), 94 mg/L of chemical oxygen demand (COD), 25 mg/L of biochemical oxygen demand (BOD5), 4.7 mg/L of total Kjeldahl nitrogen (NTK) and 0.6 mg/L of total phosphorus (PT). The biodegradability index was 0.30, which implies a limited possibility for direct treatment by means of biological processes. It is suggested to study the primary sedimentation or filtration through a geotextile. The selection of the treatment unit is made according to the characteristics of the particles in the water column.

Keywords : Aquaculture; Fish ponds; Water quality.

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