Method and system for treating wastewater

C - Chemistry – Metallurgy – 02 – F

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C02F 3/12 (2006.01) C02F 3/30 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2061252

Conventional biological processes for treating wastewater include the so-called activated sludge process which is continuous and the sequencing batch reactor (SBR) activated sludge process. The first process requires the use of dedicated, relatively expensive external clarifiers, and the second process is inefficient in terms of treatment volume. A modified sequencing batch reactor process and system enable the efficient, continuous treatment of wastewater, combining the advantages of the SBR and activated sludge processes. Wastewater is treated in three contiguous treatment sections, each of which includes a plurality of contiguous cells. In a first series of operations, the flow direction is from the first to the third sections, and in a second series of operations the flow is reversed. In each series of operations, the first step is to aerobically treat the wastewater, and then allow the sludge to settle before discharging the treated wastewater from the system. The settling steps of the process include continuous flow through settling in one section, and batch quiescent pre-settling while aerobic treatment and flowing settling are occurring in other sections of the system.

Les procédés classiques de traitement biologique des eaux usées comprennent le procédé de traitement en continu par boues activées et le procédé aux boues activées en réacteurs discontinus en série (RDS). Le premier procédé nécessite des clarificateurs externes dédiés relativement chers et le second est inefficace en termes de capacité volumique de traitement. Un procédé et un système RDS modifiés permettent le traitement en continu des eaux usées, combinant les avantages du premier et du second. Les eaux usées sont traitées dans trois bassins contigus, chacun comportant une série de cellules contiguës. Dans une première série de traitements, les eaux usées circulent du premier bassin vers le troisième et, dans une seconde série de traitements, la circulation est inversée. Dans chaque série de traitements, la première étape est un traitement aérobie suivi d'une décantation des boues avant le rejet des eaux usées traitées hors de l'installation. Les étapes de décantation du procédé comprennent une décantation en circulation continue dans un bassin et une pré-décantation en cuve sans agitation pendant que le traitement aérobie et la décantation en circulation se déroulent dans les autres bassins de l'installation.

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