The 34 MGD Otay Water Treatment Plant in San Diego, California serves a population of approximately 200,000. It is a conventional treatment plant that uses coagulation, flocculation, sedimentation, filtration and disinfection. The plant receives raw water from two different sources — imported water from the Colorado River and runoff water from three local reservoirs.
The Santa Barbara desalination plant located in the south-eastern part of Curaçao provides drinking water to about half of the population of this Caribbean island. With an average precipitation of approximately 500 mm, rainwater is the only natural source of freshwater in the island. Government efforts to address the water shortage problem date back to the 20s of the last century. Initially based on evaporation, the seawater desalination evolved into the reverse osmosis technology in the 90s. After several years of experimenting with RO, Aqualectra, the municipal supplier of potable water and electricity for Curaçao, took the decision to move forward with this technology and in 2003 started a project to build a SWRO desalination plant.
The 2013 year was the driest in recorded history with many areas of the San Joaquin Valley reporting groundwater levels more than 100 feet below previous historical lows.
Perhaps the most common question that we’re asked is how our ATP tests correlate with traditional microbiological methods. Unsurprisingly, when people are used to getting their information in a certain way, they naturally want to know how a new method will stack up against it. However, the mechanisms of culture-based techniques and ATP analyses are completely different, and in many ways, so are the results they produce.
Our environment is rife with testimonials to the law of unintended consequences. When it comes to water treatment, the compound 1,2,3-trichloropropane (TCP) is the latest surprise making its way through the remediation lifecycle.
Mixing is something that is often taken for granted when designing systems for water and wastewater treatment. Perhaps “taken for granted” is too harsh a term. Let’s instead say that while designing a treatment unit operation or process, mixing as a phenomenon is automatically assumed to occur — an assumption that forms the basis for process controls, performance guarantees and measurement methods and locations.
When emergencies inevitably arise, municipal operators need to be prepared to respond immediately to restore services in order to provide safe, reliable water to their customers. Take for example the City of Cisco, Texas.
Harmsco Filtration Products conducted a test to evaluate the performance of the Anti-microbial filter media verses Standard filter media. Two cartridges were compared, both were manufactured with 4 oz filter media, one of the cartridge’s media contained Silver Zeolite fibers which inhibit the growth of biologicals in and on the filter cartridge.
This article is for those of you who need to install a new or redo an existing pH loop. These tips can help ensure accurate and consistent readings.
A Water Quality Specialist used the Hach SL1000 Parallel Portable Analyzer (PPA) to test 6 parameters simultaneously – all within about 8 minutes. Previously, the procedure took 20 minutes just for one parameter.
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