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1. What causes sludge to turn yellow? Answer: It may be due to a low influent concentration or excessive aeration. A little glucose can be added to reduce or eliminate sludge discharge. 2. How should operations be managed when both the water volume and quality entering the system are insufficient? Answer: If it is an SBR-type process and the water volume is low, it can operate intermittently; the fan can also be turned on intermittently, with the operating time of the fan determined depending on the circumstances. 3. Deodorization equipment: How does photoionization compare to traditional absorption processes? Answer: Photoionization deodorization is generally used for small-scale applications where the odor concentration is not high; it has higher operating costs and requires significant electricity consumption. 4. Does a newly installed aeration pipe need to undergo a water test? Answer: Generally, 50 cm of water is used to test the aeration effect and the condition of the pipes, to check for any leaks and whether the aeration nozzles are damaged; only after everything is fine is the system put into official operation. 5. What method is used to detect the content of sodium acetate in liquids? Answer: A certain amount of liquid sodium acetate can be taken to determine its COD, and from this the content of the active ingredients in sodium acetate can be calculated. The COD equivalent for sodium acetate is 0.78 g/g; in other words, 1 g of sodium acetate can theoretically provide 0.78 g of COD. The calculation involves a simple conversion between concentration and volume. 6. What is the typical dosage of sodium acetate? Answer: The amount of sodium acetate to be added is related to the nitrate that needs to be removed. Under the condition of maintaining an anaerobic environment in the anaerobic zone, the required COD is calculated based on equivalents, and the amount of sodium acetate added increases from low to high. 7. What is an appropriate frequency for backwashing filter cloth filters? Answer: The standard should be once every 1-2 hours, taking into account the performance of the water exiting the secondary sedimentation tank as well. 8. Background: A wastewater treatment plant with a design capacity of 50,000 m3/day was designed (two sets of biological treatment tanks, 25,000 m3/day per set); currently, it operates at a capacity of 45,000 m3/day. Since the aeration membrane at the bottom of the aeration tank has aged and become damaged after 7 years of use, it needs to be drained and replaced separately, along with the sediment at the bottom being removed. ① Is it necessary to replace all the aeration membranes? ② Can a tank with a capacity of 25,000 handle a water volume of 45,000? Answer: First, if the aeration devices need to be replaced, they should all be replaced; otherwise, the distribution of air supply will be uneven, posing operational risks. Second, running the pool at double capacity increases water usage; unless you are confident that you can meet the requirements, it’s better to wait until the dry season.