Metal Finishing Guide Book


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compliance with effluent limitations. Operators need daily analytical data to control system performance and to make needed adjustments to treatment chemistry. This is often accomplished using inexpensive troubleshooting analytical tools including pH papers in lieu of a hand-held pH meter, and potassium iodide-starch papers for cyanide oxidation process control. Quick and easy tests for CN and metals used in the process are important. A number of test kit suppliers are available to choose from. It is not always necessary to have the sophistication of a spectrophotometer or atomic absorption unit for in-house troubleshooting and quality control. It is important, however, to have this service and complete analytical services available from a competent outside laboratory. All regulatory agencies will require data submission based on approved test methods and procedures with report submittals. It is imperative to know your regulator and communicate with him/her regarding system operations, both good and bad. Most agencies require notification of system upsets and slug loads. Although the typical metal finisher is reluctant to report problems, it is always better to report problems than for the regulator to find them. Notification always can be used as mitigation at enforcement proceedings. COMMON MISCONCEPTIONS AMONG METAL FINISHERS ABOUT WASTEWATER TREATMENT • Regulatory agencies only set effluent standards at reasonable levels necessary for environmental and POTW protection. • Consultants and suppliers always know how to solve your problems. • The use of ion exchange for complete wastewater treatment is a practical approach to eliminating discharges. • Microfiltration is a sure method of compliance because it filters out everything. • The cyanide oxidation system is not working well because you have total cyanide discharge violations. • When floating in the clarifier occurs, the probable cause is oil and grease. • A polishing filter will solve all the problems. • Metal violations are always due to clarifier or polishing filter problems. • All laboratories generate good data. • pH and ORP electrodes only have to be cleaned weekly. • If poor floc formation is observed, the polymer is bad or you're not adding enough. • In most cases, sludge dryers will save you money. • Clarifiers and filter press cloths do not need to be periodically cleaned. • The pH reading on the controller is always correct. 594

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