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When the pH ranges from 4 to 11, there <br /> is no acid or caustic feeding <br /> necessary. <br /> When the pH ranges from 11 to 14 , the <br /> pH probe #1 will send a signal to the <br /> pH monitor #1 on the electrical panel <br /> which will energize the acid metering <br /> pump 01 to adjust the pH. <br /> 2 . pH #2 Adjustment tank: <br /> After the pH treatment from the pH #1 <br /> adjustment tank, the wastewater flows <br /> to the pH #2 adjustment tank for any <br /> necessary treatment. <br /> When the pH ranges from 0 to 6, the pH <br /> probe #2 will send a signal to the pH <br /> monitor #2 on the electrical panel <br /> which will energize the 3-way air <br /> solenoid valve to open the caustic <br /> feeding valve #2 to adjust the pH. <br /> When the pH ranges from 6 to 10. 5 , <br /> there is no caustic or acid feeding <br /> necessary. <br /> When the pH ranges from 10. 5 to 14 , <br /> the pH probe #2 will send a signal to <br /> the pH monitor #2 on the electrical <br /> panel which will energize the acid <br /> metering pump #2 to adjust the pH. <br /> 3 . pH #3 Adjustment tank: <br /> After the pH is treated from the pH #2 <br /> adjustment tank, the wastewater flows <br /> to the pH #3 adiustment tank for any <br /> necessary treatment. <br /> When the pH ranges from 0 to 6. 5 , the <br /> pH probe #3 will send a signal to the <br /> pH monitor #3 on the electrical panel <br /> which will energize: Both the 3-way <br /> air solenoid valve to open the caustic <br /> feeding valve #3 to adjust the pH and <br /> 3-way diverting valve to open for the <br /> wastewater to flow back to the equal. <br /> tank for further treatment. <br /> When the pH ranges from 6 . 5 to 9 . 5,the <br /> wast water continues to flow to the <br /> city of Mainteca's water treatment <br /> line.There is no acid or caustic treat <br /> -ment necessary. <br />