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Potable Water from Industrial Wastewater

M. S. Ali*
Department of Chemical Engineering, Bangladesh University of Engineering & Technology, Dhaka-1000, Bangladesh

M. R. Khan
Department of Chemical Engineering, Bangladesh University of Engineering & Technology, Dhaka-1000, Bangladesh

T. Afroz
Department of Chemical Engineering, Bangladesh University of Engineering & Technology, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

The objective of the study was to treat the textile wastewater and convert it into potable grade water in the laboratory scale. It involved a rigorous treatment procedure involving screening, coagulation, flocculation, aeration, biological treatment, filtration and ion exchange. From the analysis of the treated water it can be said that the industrial waste water can be converted into potable grade water.

Keywords: Wastewater treatment, Zero discharge, Potable water

Location: Department of Chemical Engineering, Bangladesh University of Engineering & Technology, Dhaka-1000, Bangladesh

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity: Waste water

Objectives:

Under the circumstances it will be helpful to think of ways to treat the textile wastewater so that it can be reused.

Methodology:

The experimental work thus can be divided into three parts- analysis of the raw water, treatment of the raw water and finally the analysis of the treated water (Potable grade water) For the qualitative analysis of raw wastewater, the following parameters were measured in the laboratory :- pH , Total Dissolved Solid (TDS ) , Total Suspended Solid ( TSS ), Total Solid ( TS ), Turbidity, Color, Dissolved Oxygen, Specific Conductance, Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Different metal ion concentration. All of these parameters were measured using available standard methods. The treatment involved a rigorous treatment procedure involving screening, coagulation, flocculation, aeration, biological treatment, filtration and ion exchange. The wastewater sample was collected from the Dying and Finishing section of the textile industry. Screening of the sample was carried out with a piece of cotton cloth and its pH and TDS were measured. Its pH was then controlled with the addition of commercial grade H₂SO₄ and simultaneous aeration was carried out. Alum (aluminum sulphate) was added to this pH controlled solution as a coagulating agent. It was stirred for proper mixing. During the process successful separation of solid was observed. Addition of alum decreased the pH. So NaOH solution was added to increase the pH. It was homogenized with a magnetic stirrer and kept for a few minutes. Polyelectrolyte solution was then added as a flocculating agent. It was stirred with a magnetic stirrer for proper mixing. After floc formation an appreciable amount of floc was removed and the sample was then fit for biological treatment. Before the biological treatment aeration was carried out for a total of 24 hrs in intervals. Urea, food grade phosphoric acid and a commercial nutrient was added to the aerated sample. It was stirred for proper mixing and aeration was again carried for a total of 24hrs in intervals. This biologically treated water sample was then passed through a filter bed consisting of different size sands and stones. After sand filtration the effluent was passed through an ion exchange resin bed that consisted of a mixture of cationic and anionic resins in the 2:1 ratio. The treated water was then finally taken for analysis. The parameters measured for the analysis of treated water were same as those for the analysis of waste water.

Source of Information: Chemical Engineering Research Bulletin 12 (2008) 20-23

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study us a demonstration of effective industrial waste water treatment. If applied commercially, the industrial waste water can be recycled as potable water to complete the reuse cycle and zero discharge effluent from industry.

Knowledge Management: Journal