Process development of treatment plants for dyeing wastewater

Abstract

A three-step methodology that integrates experiments, modeling and synthesis has been developed for the systematic development of a plant for treating dyeing wastewater for discharge and/or reuse. First, wastewater characteristics, discharge water standards, and reuse water quality specifications, etc. are collected as input information. Heuristics developed in our industrial practice and gleaned from the literature are used to guide the designer to come up with preliminary flow sheet alternatives. Then, bench-scale experiments and pilot plant tests for the relevant unit operations are performed. A computer code accepts the bench-scale and pilot plant experimental data for regression of model parameters and determines the superior process configuration and equipment operating conditions through sensitivity analysis. The workflow among various stakeholders to reach the final design is presented. Possible extension of the methodology to other industrial wastewater treatment plants is discussed.

Bioaugmentation: An Emerging Strategy of Industrial Wastewater Treatment for Reuse and Discharge

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Polyelectrolyte-fluorosurfactant complex-based meshes with superhydrophilicity and superoleophobicity for oil/water separation

“…Based on the superhydrophilicity and superoleophobicity both in air and underwater, we performed a series of oil/water separation experiments using the PFC/SiO 2 -coated mesh. It is well-known that conventional liquid/liquid separation technologies require more than one separation units and consume a lot of external energy [25]. However, as shown in Fig.…”

Design, characterization, dyeing properties, and application of acid-dyeable polyurethane in the manufacture of microfiber synthetic leather

“…The compact structure in the crystalline regions prevents diffusion of the dye molecules into the polyurethane matrix [14]. This consequently leads to low dye uptake and unstable binding of the acid dyes to the polyurethane matrix that not only result in uneven coloration and poor color fastness, but also account for high dye discharge in effluents, thus posing serious environmental threats [15]. More importantly, because of the difficulty in efficiently dyeing ordinary polyurethane, more than one dyestuff is required to dye microfiber synthetic leather that complicates the dyeing process and compromises the color uniformity of the final products [16][17][18][19].…”