New Membrane System Designed for Small Communities

Sept. 1, 2000
Pall Corp. has introduced a new line of AriaSM water treatment systems specifically designed to meet the requirements of community drinking water systems serving populations of less than 10,000 people and smaller systems providing advanced wastewater treatment for reuse or meeting stringent discharge standards.

Pall Corp. has introduced a new line of AriaSM water treatment systems specifically designed to meet the requirements of community drinking water systems serving populations of less than 10,000 people and smaller systems providing advanced wastewater treatment for reuse or meeting stringent discharge standards.

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Aria systems use filtration modules with hollow fiber membranes to remove turbidity; bacteria; Giardia cysts and Cryptosporidium oocysts; and iron and manganese from ground, surface waters and secondary wastewater effluent. The systems are available in three maximum capacities - 50 gpm, 150 gpm, and 300 gpm.

The system's Microza hollow fiber membranes are highly permeable resulting in high water production rates. Each hollow fiber module provides an active surface area of 538 ft2.

Typical Applications

The Aria system is used to filter ground and surface waters for drinking water supply and industrial uses, and secondary wastewater effluent for reuse.

  • Ground Water — Aria water treatment systems remove turbidity and microbial pathogens with little or no pretreatment. They may be used for iron and manganese removal following aeration, or oxidation with chlorine or potassium permanganate. They also can be used for arsenic removal with suitable oxidation and coagulation.
  • Surface Water — For high quality source water from reservoirs, lakes, and streams, the system produces excellent quality drinking water using only the standard bag filter as pretreatment. For source waters with higher organic content or turbidity, pretreatment with oxidation, coagulation and settling may be required to obtain the optimum filtered water quality.
  • Secondary Wastewater Effluent/Water Reuse — The system is designed to remove suspended solids and pathogens for irrigation water, or as pretreatment prior to reverse osmosis to produce water for ground water injection or industrial uses.

Aria systems are in operation at more than 10 communities from the North Slope of Alaska, Oregon and California to Mexico and England.

System Overview

Aria microfiltration membrane systems meet or exceed EPA standards for safe drinking water, as established in the December 16, 1998, amended Surface Water Treatment Rule, by providing more than 6 log removal of Giardia and Cryptosporidium and filtered water turbidities less than 0.1 ntu. The systems recover approximately 95 percent of the feed water as filtered water. Process wastewater includes spent backwash water and chemical cleaning wastes.

Aria systems use semi-permeable (porous) membranes mounted in racks on a filtration skid with a painted steel frame. The system features stainless steel or schedule 80 PVC piping, manual and air operated valves, polyethylene tanks, PLC controls and software, 4-20 mA signal instrumentation, and electrical enclosures designed for high humidity and dust conditions.

Standard system design pressure is 45 psi. A 150 psi high pressure unit is available.

The Microza membrane module is available with a 0.1 micron PVDF (polyvinylidene fluoride) microfilter which has excellent chemical resistance to chlorine, ozone and other oxidants; acids; and bases.

Several pieces of optional equipment are available to customize the treatment system to meet each customer's specific needs. Options include improved instrumentation and controls, remote access, auto dialer for alarms, and chemical addition equipment for pre- or post-treatment.

The Aria family of systems was the first to receive a "full system" listing for materials of construction in accordance with NSF 61 requirements. Pall's North American manufacturing operations also have received ISO 9001 registration from Lloyd's Register of Quality Assurance Limited, representing the highest level of ISO 9000 Certification.

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