sleslie23 Aug 20, 2014:

Looking at this a little more, "agregación secuencial" seems to have a specific meaning related to mathematics. I found the following related to water treatment:

http://www.treatment.xyleminc.com/sp/handling_of_problematic...

"La belleza de la costa de Moray Firth al nordeste de Escocia estaba perdiendo de forma gradual el interés de los viajeros y pescadores debido a la polución causada por las aguas residuales que se lanzaban al mar, cerca de la costa. Pero las preocupaciones medioambientales y la legislación hicieron que las comunidades costeras construyeran tres plantas de tratamiento de aguas residuales con reactores de alimentación secuencial (SBR), cada una con bombas N de varios tamaños de Xylem. Las bombas cumplían un papel principal en la transferencia y reciclado de las aguas residuales en bruto y procesadas, que contenían hasta un 7% de sólidos secos (DS). Los beneficios medioambientales y el importante ahorro tanto en el capital como en costes de mantenimiento son obvios."

So, I think your original suggestion is the right one.

sleslie23 Aug 20, 2014:

"Step feed" has a specific meaning in the context of waste treatment. See this doc, for a good explanation:

http://www.nmenv.state.nm.us/swqb/FOT/WastewaterStudyManual/...

The key text is:

PROVIDING CONTROLLABLE INFLUENT FEEDING
The feeding of wastewater to activated sludge systems must
be controlled in a manner that ensures even loading to all
of the aeration basins in operation. Well-designed flow
splitter boxes should be incorporated into the front of the
aeration basin and they should be checked periodically to
ensure that the flow distribution is split as intended. In
some situations, it is desirable to feed wastewater
throughout various points in the aeration basin. This is
known as step feeding. Step feeding is one method ofrelieving the high oxygen demand that can occur where
the influent flow and RAS enter the aeration basin.
However, a downside to step feeding is that some of the
dissolved solids in the influent may pass through the
aeration basin too rapidly, and show up in the effluent as
BOD.

Given this, I would translate it as "agregación secuencial."