INFR2R12
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Available as an ebook
Please purchase via www.iwaponline.comOpens in new window
Also part of Water Intelligence Online Digital Reference Library
Standard ePrice: £29.00
+ VAT
Clean and process water tests for aeration efficiency measurements were performed on a suite of diffusers in different processes for approximately one year. The research plan was set up to test the same diffusers in different processes and different diffusers in the same process. The most evident finding regarding the scaling factor for oxygen transfer efficiency in process water (±-factor) is that all diffusers seems to experience a decrease with time until reaching what appears a stabilization value. As time progressed, the diffuser performance decreased for all diffusers also in terms of diffuser head loss (or dynamic wet pressure DWP). At the same time, it was observed that once the diffuser have been colonized a relatively stable base/plateau of microbial species remains in the diffuser surface. Regarding the DNA concentration found on the membranes, the silicone membrane tube was the less fouled than the other membrane tubes. Although tested in different processes, the relative microbial abundance on the membrane diffusers was of the same magnitude. One should expect much higher fouling for the high-rate process, however this may be more pronounced as the fouling biofilm fully ripens, possibly after the first year of operation.
This project was initiated in response to the establishment of mercury TMDLs around the country and issues raised by this process, specifically concerning the issue of mercury bioavailability....
Today, more than eight million tons of biosolids are generated annually for land application nationwide. These biosolids contain beneficial plant nutrients, soil conditioners, and may contain...
Plant-availability of metals in biosolids-treated soils may be mathematically described by Mt = C x [1 - e- (k x t)] where Mt (mg kg-1) is the...
Liquid streams (“reject water” or “sidestream”) generated by the dewatering of digested solids generally contain high levels of ammonia and phosphorus. These liquids can be treated in separate or...
The book provides a scientific approach into appraising Intermittent Water Supply (IWS) on a global scale through the analysis of available information and data based on a structured methodology...
Ageing infrastructure and declining water resources are major concerns with a growing global population. Controlling water loss has therefore become a priority for water utilities around the world...
The challenges of addressing the needs of aging water and wastewater infrastructure require new management approaches. Traditional municipal water management practices may not be the most cost...
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Waters in urbanized areas often experience hypoxic events due to combined sewer overflows and urban runoff. Low...