Wastewater Treatment Optimization – Culling the Devil in the Details

This paper describes wastewater treatment optimization studies performed on an industrial wastewater generated in Boston, Massachusetts, USA. The manufacturing plant generates hexavalent chromium [Cr(VI)] wastewater as a result of chromating brass, bronze and copper parts produced in the manufacturing operations. The facility utilizes a continuous flow treatment train, involving segregated Cr(VI) reduction with sodium metabisulfite (Na2S2O5) under acidic conditions, followed by combined wastestream two-stage pH adjustment, metals precipitation, and clarification before discharge to the municipal sewer. The objectives of the studies were to define and evaluate critical parameters, such as pH and oxidation reduction potential (ORP) for hexavalent and total chromium control and to perform treatability studies to optimize the performance of the wastewater treatment plant (WWTP). The treatability studies included Cr(VI) reduction versus Na2S2O5 dosage evaluations and corresponding chromium reduction kinetic studies, and trivalent chromium hydroxide precipitation. The Cr(VI) reduction experiments and chromic hydroxide precipitation studies were performed for three different wastewaters collected from within the manufacturing process; a high, typical, and dilute strength wastewater.

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Effects of process conditions in submerged ultrafiltration for refinery wastewater treatment: Optimization of operating process by response surface methodology

Desalination ◽

10.1016/j.desal.2011.08.051 ◽

2012 ◽

Vol 287 ◽

pp. 350-361 ◽

Cited By ~ 37

Author(s):

E. Yuliwati ◽

A.F. Ismail ◽

W.J. Lau ◽

B.C. Ng ◽

A. Mataram ◽

...

Keyword(s):

Response Surface Methodology ◽

Wastewater Treatment ◽

Response Surface ◽

Process Conditions ◽

Refinery Wastewater ◽

Treatment Optimization ◽

Operating Process

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Wastewater Treatment Optimization for Fish Migration Using Harmony Search

Mathematical Problems in Engineering ◽

10.1155/2014/313157 ◽

2014 ◽

Vol 2014 ◽

pp. 1-5 ◽

Cited By ~ 8

Author(s):

Zong Woo Geem ◽

Jin-Hong Kim

Keyword(s):

Wastewater Treatment ◽

Dissolved Oxygen ◽

Nitrogen Concentration ◽

Harmony Search ◽

Additional Treatment ◽

Oxygen Level ◽

Treatment Optimization ◽

Local Optima ◽

Treatment Methods ◽

Reduced Gradient Method

Certain types of fish migrate between the sea and fresh water to spawn. In order for them to swim without any breathing problem, river should contain enough oxygen. If fish is passing along the river in municipal area, it needs sufficient dissolved oxygen level which is influenced by dumped amount of wastewater into the river. If existing treatment methods such as settling and biological oxidation are not enough, we have to consider additional treatment methods such as microscreening filtration and nitrification. This study constructed a wastewater treatment optimization model for migratory fish, which considers three costs (filtration cost, nitrification cost, and irrigation cost) and two environmental constraints (minimal dissolved oxygen level and maximal nitrate-nitrogen concentration). Results show that the metaheuristic technique such as harmony search could find good solutions robustly while calculus-based technique such as generalized reduced gradient method was trapped in local optima or even divergent.

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Innovative Approaches for Drinking- and Waste-Water Treatment: An Editorial Review Summarizing and Assessing the Findings of the Special Issue

Applied Sciences ◽

10.3390/app11052063 ◽

2021 ◽

Vol 11 (5) ◽

pp. 2063

Author(s):

Ioannis A. Katsoyiannis ◽

Vincenzo Torretta

Keyword(s):

Wastewater Treatment ◽

Waste Water Treatment ◽

Special Issue ◽

Treatment Optimization ◽

Water And Wastewater Treatment ◽

Treatment Technologies ◽

Water And Wastewater ◽

Editorial Review ◽

Membrane Treatment ◽

Innovative Approaches

The present special issue collected articles that address the very important topic of innovative approaches in water and wastewater treatment technologies. Thirteen articles are published, ten research paper and three review articles. The papers can be divided in four major categories, namely, membrane treatment, adsorption studies, advanced oxidation processes and wastewater treatment optimization. In the editorial, a brief description of the findings of each paper is presented along with a critical assessment.

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