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1. An apparatus (100) comprising: A suspended growth biological reactor (110) for water treatment, wastewater treatment or reuse with an inlet (111), an outlet (112), and a separator (113), a selector (116) coupled to the biological reactor; a downstream reactor (115) coupled to the selector (116); and a structural media (10) having a single, multiple or layered strata (20) that are fixed, suspended or moving, and carrying a single or multiple biofilms (30) of single or multiple solids residence times for selective growth of organisms or for removal of carbonacecous material, nutrients, inorganic compounds or micro-pollutants in a suspended growth process, wherein the structural media (10) is fixed, suspended or moving along with the single or multiple biofilms, wherein a physical characteristic of specific gravity of the structural media is in the range of 0.9 to 1.2 confiugred for retention so as to not be over buoyant or over heavy for improved mixing profiles and distribution within the biological reactor, and the physical characteristic is achieved through inclusion of air bubbles, pores or cavities, or weighting material, or by a three-dimensional (3D) printing, moulding, extruding, baking, coating, caking, sedimenting or impregnating in manufacturing of the structural media, and the selector (116) is configured to remove the structural media by selection or separation when the structural media has a change in density between 0.05 to 1.0 g/ml, or particle size, between 10 to 1000 microns, and direct the removed structural media of the biological reactor to the downstream reactor for downstream processing.
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