Performance of a baffled facultative pond treating piggery wastes

Abstract

This paper shows the performance of a baffled facultative pond for the treatment of piggery wastes. The full-scale system is composed of an equalizer, one decanter (DP), two anaerobic ponds (LA1 and LA2), one facultative pond (LF), with five baffles, and one maturation pond with water hyacinths (LAG). The studies were conducted over a 12 month period in the west region of Santa Catarina, Brazil. The system was supplied daily with a volume of 3 m3/day of farm wastes. A good performance of the treatment system was obtained with average removal efficiencies of 98% for chemical oxygen demand, 93% for total solids, 98% for total phosphorus, 92% for total nitrogen, 7 log units of faecal coliforms and 5 log units of total coliforms. The facultative pond performed well, removing 43% of the chemical oxygen demand, 47% of total nitrogen and 54% of total phosphorus. It was found that the first baffle in the facultative pond was mainly responsible for the efficiency of this pond, and compared with another study the introduction of the baffles improved the removal efficiency by 20% for total phosphorus.

Eficiência da interação biodigestor e lagoas de estabilização na remoção de poluentes em dejetos de suínos

“…O uso de lagoas de estabilização como alternativa para tratamento de dejetos de suínos vem sendo estudado como alternativa de baixo custo e que não exige maiores cuidados operacionais (Toms et al, 1975;Oliveira, 1993;Zanotelli et al, 2002;Estrada & Hernandez, 2002). A utilização de biodigestores também se tem intensificado nos últimos anos devido à redução dos custos de implantação e manutenção (disponibilidade de novos materiais e equipamentos) e, principalmente, pela possibilidade de inserção no mercado de carbono Kunz & Oliveira, 2006); no entanto, estudos da eficiência de remoção de poluentes envolvendo a conjugação desses sistemas não têm sido muito frequentes, sobretudo no Brasil.…”

Nitrogen removal from swine wastewater by combining treated effluent with raw manure

“…For treated effluent, the content of organic matter is very low (Figure 2) favoring autotrophic processes like algae proliferation, which can be the responsible for pH increasing (Zanotelli et al, 2002). NO x -N depletion was found when fresh manure was combined with the nitrified treated swine effluent ( Figure 6).…”

Función objetivo en el diseño de la laguna facultativa (estudio de caso)

“…A la fecha se han realizado estudios a nivel laboratorio donde se incluyó el uso de mamparas en estanques de estabilización, por ejemplo: Killani and Ogunrombi (1984); Pedahzur et al (1993); Muttamara, and Puetpaiboon (1996;1997); Sperling et al (2003); Zanotelli et al (2002); Shilton and Harrison (2003a;2003b); Shilton y Mara (2005). Éstos investigadores(as) concluyeron que con el uso de mamparas a 70% de la longitud se obtiene mayor eficiencia en el tratamiento del agua residual.…”

“…To date, studies have been conducted at laboratory where the use of screens in stabilization ponds are included, for example: Killani and Ogunrombi (1984); Pedahzur et al (1993); Puetpaiboon (1996, 1997), Sperling et al (2003). Zanotelli et al (2002). Harrison (2003a, 2003b).…”