Laserfiche WebLink
Page 7 of 7 <br /> ATTACHMENT A <br /> CONDITIONALLY EXEMPT - SPECIFIED WASTESTREAMS <br /> Item II - Narrative Descriptions <br /> Specific Waste Types Treated: <br /> The Stockton Cogen facility uses potable water as a makeup supply to its steam boiler. Due to <br /> the high pressures at which the boiler operates, the quality of the water used to make steam must <br /> be very high. Consequently, the potable water must be further purified to remove normally <br /> present anions and cations(e.g. calcium, magnesium, sulfate, chloride, etc). To accomplish this <br /> requirement the Stockton facility employs an ion exchange unit. In this unit the potable water will <br /> pass through anion removing resin vessels and cation removing resin vessels. Once the ion <br /> exchange resins contained in these beds have been exhausted, sulfuric acid and sodium hydroxide <br /> solutions are used to strip away the accumulated anions and cations and thus regenerate the <br /> treatment capability of the ion exchange resin. The wastes generated as a result of the <br /> regeneration process are sulfuric acid and sodium hydroxide solutions, with pH levels which can <br /> vary from less than 2.0 to greater than 12.5. <br /> Treatment Process(es) Used: <br /> The regenerate waste waters are directed to the neutralization unit, where the pH can be adjusted <br /> and the treated water discharged to the sewer. The Stockton facility operates 24 hours per day, <br /> year round. The ion exchange unit is regenerated approximately once per day. <br />