Design principles in water reclamation for good water quality

Author(s):  
Aishwarya Rani ◽  
Chang-Tang Chang
2018 ◽  
Vol 13 (3) ◽  
pp. 589-593 ◽  
Author(s):  
T. Niwa ◽  
R. Yin ◽  
M. H. Oo ◽  
H. Noguchi ◽  
T. Watanabe ◽  
...  

Abstract Application of membrane technology for water reclamation has grown significantly in recent years due to reduced footprint size and more consistent product water quality. For a membrane bioreactor (MBR) system, it is critical for it to be robust to allow membrane systems to operate at higher flux without significant increase of trans-membrane pressure (TMP). A full-scale ceramic MBR system was installed at Changi Water Reclamation Plant (CWRP) as part of an MBR retrofit project to increase treatment capacity without expanding the plant's footprint. The nominal capacity of the ceramic MBR system is 15,000 m3/d. The system has been successfully operating since January 2017 with a net flux of 30–60 L/m2-hr (LMH). Stable operation was observed at nominal production capacity for more than 3 months. During that period, the TMP was stable in the range of 9–14 kPa for Tank A and 10–17 kPa for Tank B. Permeate turbidity was recorded in the range of 0.04–0.06 NTU for both Tank A and Tank B.


Desalination ◽  
2011 ◽  
Vol 274 (1-3) ◽  
pp. 237-245 ◽  
Author(s):  
Fraser C. Kent ◽  
Joel Citulski ◽  
Khosrow Farahbakhsh

Water Policy ◽  
2016 ◽  
Vol 18 (4) ◽  
pp. 844-861 ◽  
Author(s):  
Wenlan Ke ◽  
Yalin Lei ◽  
Jinghua Sha ◽  
Guofeng Zhang ◽  
Jingjing Yan ◽  
...  

Mining cities have undergone the process of extensive exploitation, which always results in a series of water issues. Integrated water resource management is necessary in improving water supply, allocation and quality without damaging economic development. This article constructs a linear optimization model including a ‘Top-Down’ socio-economic mode, and ‘Bottom-Up’ water quality control and water supply–demand modes with integrated water resource management focused on water allocation and water reclamation. Based on computer simulation, the model can propose a water resource management under the constraints of water supply–demand and water quality control, and the model can precisely predict the influences of water resource management on economic development, water utilization and water quality. Taking Ordos, a Chinese national resource city, as a case study, this model addresses a detailed water resource management, including a water allocation plan among industries and water reclamation plan with technologies, selection, arrangement and subsidies. The implementation of water resource management can fulfill multiple objectives on water quantity, water quality and sustainable economic development. This study indicates that water resource management with a comprehensive dynamic model can be a maneuverable approach to realize the sustainable development of economic growth and water resource utilization, as well as formulate the regional development plan.


2013 ◽  
Vol 13 (2) ◽  
pp. 214-226 ◽  
Author(s):  
P. du Pisani ◽  
J. G. Menge

Direct drinking water reclamation from the Goreangab reclamation plant, has been a reality in Windhoek, Namibia since 1968. Potable reclamation is a fixed part of the water supply and waste water has become an indispensible resource for the survival and continued growth of the city. The multi barrier concepts that were applied 40 years ago have been refined over many years. Improvements in water treatment technology have made it possible to improve the reliability and the drinking water quality of the reclamation treatment process. With the latest upgrade, which was designed 14 years ago and commissioned in 2002, a specific design philosophy was followed. This paper will assess whether the objectives of the design philosophy have been met in terms of removal efficiencies and safety of drinking water, which contains at present 25% reclaimed water. The basis and aims of the multi barrier design that was applied is discussed and with the aid of natural organic matter (NOM) and microorganism removal, the reliability of the philosophy is tested and compared with the goals set. Comparisons are drawn between the new plant and the previous plant and how the new plant is able to accommodate changes in raw water quality. It can be concluded that the water quality has been improved and the barrier principle does reduce the risk and improve the water quality.


2014 ◽  
Vol 955-959 ◽  
pp. 4074-4077
Author(s):  
Wei Zhang

Functions of campus waterpront landscape mainly reflected in recreation, ecological and landscape art. Analyzes the problems of the destructed water quality, stiff shoreline, unparticipatable and can not reflect the ecological and cultural characteristics of the campus in a large number of campus waterpront landscape, intruducts the renovation and design principles of sustainability, viewable and participatable, and the Renovation and design methods of constructing the natural ecological revetment form, creating a free revetment shoreline, plant local plants on the revetment, and set hydrophilicity facilities.


2014 ◽  
Vol 36 (2) ◽  
pp. 153-165 ◽  
Author(s):  
Nagahisa Sato ◽  
Rongjing Xie ◽  
Takuro Yoneda ◽  
Yongjie Xing ◽  
Atsushi Noro ◽  
...  

2020 ◽  
Vol 42 (4) ◽  
pp. 210-217
Author(s):  
Jae Min Park ◽  
Wontae Lee

Objective:This study investigated the effects of ozone, chlorine dioxide, and chlorine pretreatment on water quality and microfiltration characteristics in the water reclamation facility.Methods:Ozone (0.5-2.5 mg/L), chlorine dioxide (1-5 mg/L) and chlorine (1-5 mg/L) were injected as an pre-oxidizing agent, and membrane fouling and surface damage during microfiltration (PVDF) were assessed. Results and Discussion:The hydrophobic substances were decomposed as the dosages of ozone and chlorine injected increased. However, chlorine dioxide could not effectively decompose hydrophobic organic matters in the range of 1-5 mg/L. In the case of pretreatment with chlorine, the microfiltration operation time was longer than in the case of pretreatment with ozone and chlorine dioxide. As the concentration of chlorine injection increased, the membrane filtration time before backwash gradually increased. Regardless of the type and concentration of the oxidizing agent, the membrane damage rate by the oxidizing agent was less than 1% within 28 days, and no surface damage was observed. Conclusions:Chlorine was considered to be the most efficient pre-oxidizer for microfiltration process with a PVDF membrane to reuse biologically treated wastewater in the wastewater treatment plant.


1992 ◽  
Vol 26 (9-11) ◽  
pp. 2579-2582 ◽  
Author(s):  
P. Romano ◽  
R. Ranzani ◽  
F. Tecchiati

The effects of the decade long (1980-1990) reclamation process carried out on the Po River water (Italy's most important river) in Turin's metropolitan area are evaluated. Water quality is assessed by analyzing the biological data obtained through the application of the E.B.I, index. The latest data (January 1991) demonstrate that the negative impact of an area numbering some 3 million equivalent inhabitants can be minimized.


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