Water Treatment Questions and Answers (1)

1. Usually, when talking about activated sludge method MLSS in textbooks, it is said that it should be controlled at 2000-3000 mg/L. But sometimes engineering seems to be much smaller than what is said in textbooks. What is the source of this?

Answer: The specific amount of MLSS depends entirely on the F/M value; therefore, the MLSS value should not be fixed, depending on the substrate concentration of the inflow sewage and wastewater and system adjustment (referring to the influent water containing refractory, high SS value, etc. beforehand response); at the same time, the effective components in the MLSS value need to be considered, so that a comprehensive evaluation can be achieved.

2. In order to observe the status of sewage treatment, microscopic examination is necessary! Then, when testing, how many microorganisms (flagellates, nematodes, clockworms, rotifers) are observed in 1ml of liquid to indicate that the operation effect is good? Or does it work poorly?

Answer: The number is not the key, because it will fluctuate with the MLSS value, temperature, and influent composition; the key is whether the proportion of the population is coordinated, and the quality of water quality treatment is not determined by a single indicator, and other indicators need to be considered to enhance the judgment. accuracy.

3. In biochemical treatment, to what extent should some inorganic ions such as sulfate ions and chloride ions be controlled?

Answer: The specific data is unknown. Since microorganisms have the effect of being domesticated, whether the influent concentration of inorganic salts will have an impact on the activated sludge still needs to consider the degree of domestication of the activated sludge, the concentration of MLSS, the contact time, etc.; It is more feasible to judge the tolerance of a single system to inorganic salts.

4. When industrial wastewater is oxidized by biological contact, should the concentration of incoming organic matter be controlled, probably within that range?

Answer: It depends entirely on your requirements for the effluent. If it is directly discharged after contact oxidation, the concentration of organic matter in the influent should be controlled. How much this concentration is controlled depends on the removal efficiency of your contact oxidation tank. You can accumulate data during operation to get your The treatment efficiency of the contact oxidation tank can be used to judge its possible maximum resistance to organic load.

5. My current water intake is 3.5 cubic meters per hour, and the water output from UASB is unstable. Between 1000 and 1800, the chloride ion is about 9000 mg/L. After entering the aerobic pool, I add 2.5 cubic meters of tap water and 75 kg of flour at the same time. The effective volume of each pool is 100 square meters, and a small amount of bellworms can be seen in the creatures. The sv32% of the aerobic pool A (anaerobic effluent with mud) the sv20% of the aerobic pool B is about 650. I feel that it cannot be cultivated. The removal rate Not high, what’s the matter?


  1. Since the UASB effluent is already high, do not add flour in the aerobic zone.
  2. Most of the flour contains amylopectin, which is not easy to be quickly utilized and degraded, and considering the price, it is usually not used for culturing bacteria. Shenyang water treatment equipment, Shenyang pure water machine
  3. Since it is still in the cultivation stage, it is recommended to reduce the concentration of organic matter in the influent water as the key, so do not add flour. Add tap water to increase the amount of water, and the diluted water can be retained.
  4. The chloride ion content is high, but there is no way to improve its adaptability by actively discharging the activated sludge in the aerobic tank and by renewing the activated sludge.
  5. Confirm the F/M value to make sure the MLSS value is within a reasonable range.

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Further reading:

Water treatment UF system

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