There are some electroplating factories around Klang valley area, that do not have good facilities for wastewater treatment. Wastewater from the electroplating process contain cyanide and metallic ions like copper, nickel, chromium, lead, zinc, silver and others which is discharged directly into drains. Department of Environment (DOE) is the regulatory body for wastewater effluent quality through the Environmental Quality Act 1974 and its regulations such as the Environmental Quality (Sewage) Regulations 2009 and Environmental Quality (Industrial Effluent) Regulations 2009. The quality of surface water is determined by the Water Quality Index and the suitability of surface water for irrigation is based on the designated classifications in the National Water Quality Standards for Malaysia established by DOE. A silver (Ag) electroplating plant producing a wastewater stream contains 5 wt% Ag which need to be treated before disposal. The wastewater is fed to a treatment tour where 95% of the fed Ag is recovered, while residual liquid water is sent to waste pond. Maximum capacity of the treatment tour is 6000 kg wastewater/hr. When the fed wastewater stream at a rate higher then the capacity of the treatment tour, the excess wastewater bypass the unit and combines with the residual liquid water from the treatment tour and goes to the waste pond. Initially flowrate of the fed wastewater (Mo) is in the range of 4000-5000 kg/h, suddenly after 30 hours the flowrate varies according to a linear equation, M (kg fed wastewater at time t) = 50t (hr) + Mo(initial wastewater flowrate). The linear flowrate continue according to the equation, however after 60 hours the flowrate has reached its steady state and continue at constant flowrate value. Choose one Mo from the given range, draw process flow diagram of the system and determine composition of each stream for the three M conditions (initial flowrate, linear flowrate and constant flowrate). The company plan to increase capacity and efficiency of the treatment tour, please comment and justify the need. Support the justification by comparing the allowable concentration of Ag in disposed wastewater by the National Water Quality Standards, DOE Malaysia with the final concentration of Ag in the residual liquid waste before sending to the waste pond. Justification should be clearly stated and supported with reference.
There are some electroplating factories around Klang valley area, that do not have good facilities for wastewater treatment. Wastewater from the electroplating process contain cyanide and metallic ions like copper, nickel, chromium, lead, zinc, silver and others which is discharged directly into drains. Department of Environment (DOE) is the regulatory body for wastewater effluent quality through the Environmental Quality Act 1974 and its regulations such as the Environmental Quality (Sewage) Regulations 2009 and Environmental Quality (Industrial Effluent) Regulations 2009. The quality of surface water is determined by the Water Quality Index and the suitability of surface water for irrigation is based on the designated classifications in the National Water Quality Standards for Malaysia established by DOE. A silver (Ag) electroplating plant producing a wastewater stream contains 5 wt% Ag which need to be treated before disposal. The wastewater is fed to a treatment tour where 95% of the fed Ag is recovered, while residual liquid water is sent to waste pond. Maximum capacity of the treatment tour is 6000 kg wastewater/hr. When the fed wastewater stream at a rate higher then the capacity of the treatment tour, the excess wastewater bypass the unit and combines with the residual liquid water from the treatment tour and goes to the waste pond. Initially flowrate of the fed wastewater (Mo) is in the range of 4000-5000 kg/h, suddenly after 30 hours the flowrate varies according to a linear equation, M (kg fed wastewater at time t) = 50t (hr) + Mo(initial wastewater flowrate). The linear flowrate continue according to the equation, however after 60 hours the flowrate has reached its steady state and continue at constant flowrate value. Choose one Mo from the given range, draw process flow diagram of the system and determine composition of each stream for the three M conditions (initial flowrate, linear flowrate and constant flowrate). The company plan to increase capacity and efficiency of the treatment tour, please comment and justify the need. Support the justification by comparing the allowable concentration of Ag in disposed wastewater by the National Water Quality Standards, DOE Malaysia with the final concentration of Ag in the residual liquid waste before sending to the waste pond. Justification should be clearly stated and supported with reference.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:There are some electroplating factories around Klang valley area, that do not have good
facilities for wastewater treatment. Wastewater from the electroplating process contain
cyanide and metallic ions like copper, nickel, chromium, lead, zinc, silver and others which is
discharged directly into drains. Department of Environment (DOE) is the regulatory body for
wastewater effluent quality through the Environmental Quality Act 1974 and its regulations
such as the Environmental Quality (Sewage) Regulations 2009 and Environmental Quality
(Industrial Effluent) Regulations 2o09. The quality of surface water is determined by the
Water Quality Index and the suitability of surface water for irrigation is based on the
designated classifications in the National Water Quality Standards for Malaysia established
by DOE.
A silver (Ag) electroplating plant producing a wastewater stream contains 5 wt% Ag which
need to be treated before disposal. The wastewater is fed to a treatment tour where 95% of
the fed Ag is recovered, while residual liquid water is sent to waste pond. Maximum capacity
of the treatment tour is 6000 kg wastewater/hr. When the fed wastewater stream at a rate
higher then the capacity of the treatment tour, the excess wastewater bypass the unit and
combines with the residual liquid water from the treatment tour and goes to the waste pond.
Initially flowrate of the fed wastewater (Mo) is in the range of 4000-5000 kg/h, suddenly
after 30 hours the flowrate varies according to a linear equation,
M (kg fed wastewater at time t) = 50t (hr) + Mo(initial wastewater flowrate).
The linear flowrate continue according to the equation, however after 60 hours the flowrate
has reached its steady state and continue at constant flowrate value.
Choose one Mo from the given range, draw process flow diagram of the system and
determine composition of each stream for the three M conditions (initial flowrate, linear
flowrate and constant flowrate).
The company plan to increase capacity and efficiency of the treatment tour, please comment
and justify the need. Support the justification by comparing the allowable concentration of Ag
in disposed wastewater by the National Water Quality Standards, DOE Malaysia with the
final concentration of Ag in the residual liquid waste before sending to the waste pond.
Justification should be clearly stated and supported with reference.
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