Effluent dedicated plant

The choice of autoclave or dedicated plant. It is easy both to under- or over-estimate the required processing capacity when designing an effluent disposal facility. Over-estimation may lead to excess capital and perhaps running costs under-estimation may lead to process delays while effluent is treated, and increased risk of escape of agent. To err on the side of overestimation is the safe course, if capital costs allow. 

Surfactants and their biotransformation products enter surface waters primarily through discharges from wastewater treatment plants (WWTPs). Depending on their physicochemical properties, surface-active substances may partition between the dissolved phase and the solid phase through adsorption onto suspended particles and sediments [1,2]. Several environmental studies have been dedicated to the assessment of the contribution of surfactant residues in effluents to the total load of surfactants in receiving waters. This contribution reviews the relevant literature describing the presence of linear alkylbenzene sulfonates (LASs) and in particular of their degradation products in surface waters and sediments (Table 6.3.1). 

The cooled reactor effluent can be processed for the ultimate production of polymer-grade olefins. Several design options are available, including fully dedicated recovery facilities recovery in a nearby, existing ethylene plant recovery section to minimize capital investment or processing in a partial recovery unit to recover recycle streams and concentrate olefin-rich streams for further processing in nearby plants. 

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