Контекст следующий:
The range of products (of the company) include cyclones, centrifuges, vibrating sсreens, spiral
separators, belt presses, filter presses, water filters, lamella settlers, sampling
systems, dryers and package sewage water treatment plants.

Заранее спасибо за помощь.

пакетная? водоочистная станция - тут я не знаю, м.б. под package имеется в виду "в комплекте"

EEC MBBR - MBR package plants for wastewater are compact, meet stringent consent standards, low capital cost, low operational cost, delivered inside standard ISO containers, modular, skid mounted ready to be operated, easy start-up, handles shock loading, ammonia and nutrient removal, easy to install, easy to move around and expand. EEC has proven to be a true pioneer when it comes to development of Moving Bed Bio Reactors (MBBR) compact biological package plants.

Package plants may be referred to as high charged or low charged. This refers to the way the biological load is processed. In high charged systems, the biological stage is presented with a high organic load and the combined floc and organic material is then oxygenated for a few hours before being charged again with a new load. In the low charged system the biological stage contains a low organic load and is combined with flocculate for a relatively long time.
http://en.wikipedia.org/wiki/Sewage_treatment