Les navigateurs dsuets ne disposent pas de caractristiques scuritaires permettant dassurer la scurit de vos renseignements. Filter backwash water shall not be recycled when the raw water contains excessive algae, when finished water taste and odour problems are encountered, or when disinfection byproduct levels in the distribution system may exceed allowable levels. If pressure media filters are used for pre-treatment they must be designed according to Section 4.3.2.2. Radioactive materials include, but are not limited to, granulated activated carbon (GAC) used for radon removal; ion-exchange regeneration waste from radium removal; and manganese greensand backwash solids from manganese removal systems, and reverse osmosis concentrates where radiological constituents are present. Removal of precursors prior to chlorination by optimizing: Coagulation/flocculation-sedimentation-filtration. The drain shall be constructed to not allow short circuiting of raw or pre-treated water to the filter under-drain; the walls of the filter box shall be configured to prevent short circuiting of flow between the media and the walls; provisions to permit filtered water (from another filter unit) to flow slowly upwards at a maximum rate of 0.1. provisions for a temporary hose connection between the outlet of the pretreatment unit or raw water source and the outlet side of filters to permit water to flow slowly upwards from the bottom, through the drainage system and the gravel and sand bed, during plant start-up operation; provisions for draining each filter tank; a continuous, relatively uniform flow of water through the filter; a valve to control rate of raw water into the supernatant water reservoir; a valve capable of accurately controlling the rate of filtration; an effluent pipe designed to maintain the water level above the top of the filter sand; construction to prevent cross connections, and common walls, between potable and non-potable water.

Although standards and advisories for organics are being developed, there have been numerous cases of organic contamination of public water supply sources. Pressure aeration devices shall be designed to: Packed tower aeration (PTA) which is also known as air stripping involves passing water down through a column of packing material while pumping air counter-currently up through the packing. A satisfactory straight section of pipe shall be installed upstream and downstream of the meter in accordance with the meter manufacturer's recommendations to improve accuracy where required. A performance bond or other acceptable arrangement has been made to the owners, or official custodians are adequately protected financially or otherwise in case of failure of the process or equipment.

feeders will be able to supply, at all times, the necessary amounts of chemicals at an accurate rate, throughout the range of feed; chemical contact materials and surfaces are resistant to the aggressiveness of the chemical solution; corrosive chemicals are introduced in such a manner as to minimize potential for corrosion; chemical feeders are as near as practical to the feed point, and. Pilot Plant Study: Prior to initiating the design of a membrane treatment facility, the reviewing agency should be contacted to determine if a pilot plant study will be required. At least one check valve within the well casing or in compliance with requirements of the reviewing authority. Each pump system is to include calibration tubes, check valves, isolating valves and pressure relief valves.

Chlorine is the preferred disinfecting agent and may be introduced into the water supply using either sodium or calcium hypochlorite. The physical configurations include hollow-fibre, spiral wound and tubular. Open construction between the sidewall and roof is not permissible. The only allowable openings are vents, manholes, overflows, risers, drains, pump mountings, control ports, and piping for inflow and outflow (See 7.10). All storage tanks shall be contained in a curbed concrete containment area large enough to contain at least one full storage drum. Space should be provided adjacent to the chemical rooms for expansion if required; A bag splitter, storage hopper, volumetric feeder and solution tank shall be used to make down a 5% to 10% slurry; A manual make down system may be used as approved by the reviewing authority; Ventilation shall comply with the applicable Workers Compensation Board requirements; Where polymers are used as a coagulant or filter aid a separate room shall be provided for storage and feed equipment; Liquid polymers are preferred over dry granular materials; Polymers may be anionic, cationic, or non-ionic depending on the water treatability tests; Neat polymer solution shall be fed into specifically designed mixing and dilution equipment for direct application to the feed points; Dilution rates shall be in strict accordance with the chemical supplier's recommendation; Polymer shipping containers shall be stored in contained areas; Sufficient storage shall be provided for 30 days use at average day flows at the ten-year design horizon at the estimated average dosage; Ventilation shall comply with the applicable Workers' Compensation Board requirements; Calibration tubes shall be installed on each polymer metering pump to permit regular testing of metering pump output; Flow meters shall be installed on dilution water lines to the polymer makedown system; A check and ball valve assembly shall be installed at the point of chemical application; Feed rates shall be paced on flow with manual dosage adjustment; All storage tanks shall be stored in contained areas; Storage containers or tanks shall be sited out of the sunlight in a cool area and shall be vented to the outside of the building; Calibration tubes shall be installed on each, Metering pumps shall be compatible with the specific. Microfiltration and ultrafiltration for public water supplies. The Government of British Columbia, Ministry of Health Services. Openings must be provided with raised curbs and watertight covers having overlapping edges similar to those required for finished water reservoirs; Overflows, where provided, must be protected with corrosion resistant screens and must terminate with either a turned down bend having a proper free fall discharge or a self-closing flap valve; Two wet salt storage tanks or compartments designed to operate independently should be provided; The salt shall be supported on graduated layers of gravel placed over a brine collection system; Alternative designs which are conducive to frequent cleaning of the wet salt storage tank may be considered.

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No drain on a water storage structure may have a direct connection to a sewer or storm drain. Piping larger than 50 mm in diameter could also be stainless steel, if preferred by the professional engineer. If you have questions about accreditation or would like to become accredited to the DWQMS, please contact one of these organizations: SAI GlobalEmail: dwqms@saiglobal.comTel: 416-401-8672, Learn more: Ontarios Drinking Water Quality Management Standard Pocket Guide, Learn more: Accreditation Protocol Operating Authorities, Learn more: Directors Directions Minimum Requirements for Operational Plans, Learn more: Operating Authority Accreditation: How to respond to audit findings. Individual booster pumps shall not be allowed for any individual service from the public water supply mains.

Other forms of grouting may be approved for driven casing. Spill response equipment, such as absorbent pads, should be stored in a weatherproof container near the generator. Separation of sewer and water services from the main to the house should meet regional procedures. Read: standard and reduced sampling and eligibility for exemption. Sufficient testing shall be conducted to show that the membrane can be satisfactorily cleaned, and that significant irreversible fouling will not occur in the full-scale design. Ontario.ca needs JavaScript to function properly and provide you with a fast, stable experience.

Iron, manganese, or a combination of the two, should not exceed 0.3 mg/L in the water as applied to the ion exchange resin. Automatic or remote control devices shall have a range between the start and cutoff pressure which will prevent excessive cycling; Two electric-driven pumps, provided there is an emergency power supply for at least one of the pumps. Spent lime rock shall be disposed of in an appropriate manner and in an area in conformance to the CEPA. (See. Use separate high lift pumps wherever possible when pressures exceed 500, Having a Ground Force Circuit Interrupter (GFCI) protection device as per the. Pipe previously used for conveying potable water shall not be reused without permission of the reviewing authority. For other guidelines on fluoridation systems see the April 1999 Fluoridation Design Manual for Water Systems in B.C. Maintenance cost information should include cost estimates for labour, materials, equipment, spare parts, specialized tools and the identification of contract requirements and costs. Combination stop and waste valves shall not be installed underground in water service piping. Sedimentation shall follow flocculation.

Reverse osmosis, nanofiltration or electro dialysis should be investigated when the water has high levels of sulfate or when the chloride content or dissolved solids concentration is of concern. request a replacement well identification plate within 30 days after discovering its loss or damage. The filters shall be designed to provide for: The use of these filters shall require prior engineering studies to demonstrate the adequacy and suitability of this method of filtration for the specific raw water supply. Laboratory equipment shall be provided for determining the effectiveness of stabilization treatment. In most cases groundwater will be the best choice of the water source over surface water, unless the groundwater contains high levels of heavy metals or toxins such as arsenic which mandates sophisticated treatment equipment, and operation and maintenance, compared with the surface water option. Level-indicating devices should be provided at a central location; Pumps should be controlled from tank levels; Overflow and low-level warnings or alarms should be located at places in the community where they will be under responsible surveillance 24 hours a day. Bagged salt and dry bulk salt storage shall be enclosed and separated from other operating areas in order to prevent damage to equipment. The installation must comply with the latest edition of the Installation Code for Oil-Burning Equipment (CSA-B139).

This requirement may be reduced when the source and treatment facilities have sufficient capacity with standby power to supplement peak demands of the system. Provisions shall be made for venting the well casing to atmosphere. In calculating the stability index and the corresponding chemical feed adjustments, consideration must be given to items such as the water temperature, if it varies with the season and within various parts of the distribution system; the velocity of flow within various parts of the distribution system; the degree of stability needed by the individual customer; and the dissolved oxygen content of distributed water, especially in water having low hardness and alkalinity.