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Coagulation

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...

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Pulse electro-coagulation application in treating dibutyl phthalate wastewater.

Tao Wang¹, Tianqing Liu¹

¹College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|September 7, 2017

Summary

Pulse electro-coagulation (PEC) effectively treats plastic factory wastewater, removing dibutyl phthalate (DBP). Iron electrodes offer superior efficiency and economic benefits over aluminum for DBP removal in this advanced wastewater treatment method.

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Area of Science:

Environmental Science
Chemical Engineering
Water Treatment Technologies

Background:

Plastic factory wastewater contains pollutants like dibutyl phthalate (DBP).
Traditional electro-coagulation methods may lack efficiency and economic viability.
Advanced oxidation processes are needed for effective wastewater treatment.

Purpose of the Study:

To investigate the efficacy of pulse electro-coagulation (PEC) for treating plastic factory wastewater.
To compare the performance of PEC with traditional electro-coagulation.
To identify optimal operating conditions for DBP removal using PEC.

Main Methods:

Synthetic wastewater containing dibutyl phthalate (DBP) was prepared.
Pulse electro-coagulation (PEC) was applied using iron and aluminum electrodes.
Experiments were conducted varying parameters such as pH, current density, and electrode type.
DBP removal efficiency and energy consumption were measured.

Main Results:

PEC demonstrated superior economic efficiency and removal efficiency compared to traditional electro-coagulation.
Iron electrodes were more effective than aluminum electrodes for DBP removal.
Optimal conditions for 75% DBP removal included iron anode, pH 8-9, and a current density of 15 mA cm⁻².
Pollutants were reduced to acceptable levels under optimized PEC conditions.

Conclusions:

Pulse electro-coagulation (PEC) is a highly effective and economical method for treating plastic factory wastewater contaminated with DBP.
Iron anodes are recommended for enhanced DBP removal efficiency in PEC systems.
Optimized PEC parameters ensure pollutant reduction to environmentally acceptable levels.