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When the pH ranges from 9 . 5 to 14 ,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 acid <br /> metering pump #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 /> Kari Floor <br /> SwiKh <br /> 150o Goll0-n Cau3hG <br /> Tann caustic Nh ldCn <br /> 2•�tJArYShu!-o!� Pun>w <br /> s <br /> CouS+iC <br /> ✓alye- 9 q <br /> � Alr eeoJu/aror,5 . � ✓a/rP ,/al✓R- <br /> i <br /> 3-way 5`way 3-Wary <br /> 501BnO/ol✓alp A�V)VfP solet,)O(d ✓a/vim <br /> PH+l +dj. Tank pN♦z Adj. TanL pN,44 ntij. TaNL <br /> Figure 3-5 Caustic tank <br /> 3 . 4 Caustic feed The 2-way air solenoid valve is <br /> operation energized by the Kari float switch' s <br /> signal from the equalization tank. <br /> The supply air flows through the 2-way <br /> air solenoid valve and filter/reg- <br /> ulator/lubricator set to operate the <br /> air diagram Wilden pump. If there is no <br /> caustic feeding demand,the air diagram <br /> Wilden pump just circulates the <br /> caustic solution. <br />