mA

Incorrect. Resistance is measured in ohms.

Incorrect. Voltage is measured in volts.

Correct! A milliampere is one-thousandth of an ampere, which is the unit of electrical current.

Incorrect. Power is measured in watts.

Incorrect. Filtration primarily relies on physical separation of contaminants.

Incorrect. Disinfection often uses chemical processes.

Correct! Electrolysis uses electrical current to break down contaminants, making mA readings crucial.

Incorrect. Sedimentation relies on gravity to settle out solids.

Incorrect. A stable mA reading suggests consistent DO levels.

Correct! Fluctuations in mA readings from a DO probe suggest changes in dissolved oxygen levels.

Possible, but not the only explanation.

Incorrect. mA settings are specific to the sensor and not directly related to water quality fluctuations.

Incorrect. A higher mA reading indicates a stronger current.

Incorrect. A stronger current often leads to more efficient removal of contaminants.

Correct! A higher mA reading generally indicates a stronger current, which can be beneficial for treating heavily contaminated water.

Incorrect. The mA setting should be adjusted based on the specific treatment needs.

Incorrect. The context of the measurement is crucial for interpretation.

Incorrect. The instrument's design and specifications influence the mA reading.

Correct! While temperature can affect water properties, it is not a primary factor in interpreting mA readings.

Incorrect. Understanding the entire treatment process is essential for interpreting mA readings within context.

Here are two possible reasons for the decreasing mA reading:

1. **Electrode Degradation:** Electrodes used in electrolysis wear down over time due to chemical reactions and corrosion. This can lead to increased resistance and a reduced current flow, resulting in a lower mA reading.
2. **Scaling or Fouling:** The electrodes can become coated with mineral deposits (scaling) or organic matter (fouling) from the wastewater. This build-up also increases resistance and reduces current flow, lowering the mA reading.

Suggested Steps:

1. **Inspect the Electrodes:** Carefully examine the electrodes for signs of wear, corrosion, scaling, or fouling.
2. **Clean or Replace Electrodes:** If necessary, clean the electrodes to remove scaling or fouling. If the electrodes are severely damaged, replace them with new ones.
3. **Adjust the mA Setting:** If the mA reading is consistently low, adjust the settings on the electrolysis unit to compensate for the reduced current flow.
4. **Monitor the Treatment Efficiency:** After making adjustments, carefully monitor the treatment efficiency to ensure the removal of heavy metals remains effective.