E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

Ten major problems in the development of urban sewage treatment

by:BOQU     2023-04-08
1. Confused technical terms Technical terms are the basic content of technical work. The standardization of technical terms undoubtedly plays a very important guiding role in the development and application of technology, but unfortunately, we seem to have some problems in some basic technical terms, MBBR and IFAS are not clear, anyway, add fillers inside All are called MBBR. 'Improved A2O', 'Packed A2O', and 'Inverted A2O' are unique. In fact, A2O is A2O, and JHB is JHB; there is no difference between cracking, gasification, and carbonization, and they are all called sludge carbonization. I think of Mr. Shan Tianfang's words: 'Don't open up the world, create another one' seems to have that meaning. 2. MBR is prevalent. MBR can be seen in countries all over the world, but MBR is rare in the construction of honeycombs like China. The quality of effluent water is high, it needs to be recycled, and the occupied area is limited. MBR is indeed competitive. But if only to reach level one. A, first level B, whether blindly adopting MBR can achieve sustainable development is debatable. 3. Underground sewage treatment plants became fashionable Once upon a time, underground sewage treatment plants sprang up in China. For a time, underground sewage treatment plants were built on both sides of the Yellow River. As we all know, this kind of underground sewage treatment plant is only a product under special conditions, there is no universality, only a few. Not to mention the high cost of investment and operation, the key to underground sewage treatment plants is high technical risk, which is very rare in European and American countries. Even in a narrow country like Japan, it is only an isolated case. In China, underground sewage treatment plants have become synonymous with eco-chic, which is incredible. If the underground sewage treatment plant is understood as eco-friendly, then the deodorization of the traditional sewage treatment plant seems to have a long way to go. 4. Prevailing of plate and frame dewatering Sludge Little attention has been paid to the sustainable dewatering of sludge. On the contrary, plate and frame dehydration, which consumes a lot of chemicals, is popular. High dry sludge dewatering seems to be considered as a good solution to the sludge disposal problem. 5. Sludge anaerobic digestion is rare. As we all know, only a few dozen of the 4,000 sewage treatment plants have anaerobic digestion, and few of them can operate normally. Of course, when it comes to this matter, some people will always say that the proportion of organic sludge in China is low, the operation is complicated, and the investment is high, but they always ignore how the sludge should be harmless. Anaerobic digestion is an important way to achieve the stability of organic matter, and it is also an important way to kill pathogens in sludge. If you are still holding a low proportion of organic matter, then wait for the organic matter to stink and dehydrate the sludge to be troublesome. 6. Chlorine dioxide disinfection is regarded as a magic weapon. Once upon a time, chlorine dioxide has become the standard configuration for disinfection of sewage treatment plants, but the mainstream method of disinfection in sewage treatment plants around the world is still liquid chlorine or sodium hypochlorite. The popularity of chlorine dioxide disinfection technology is puzzling. 7. Flooding of high-density sedimentation tanks In order to meet the so-called first-level A standard, the problem of traditional secondary sedimentation tanks is ignored, and a high-density sedimentation tank is simply and rudely added behind. It is everywhere, just like a girl whose face is always acne, But it's not good to treat, some makeup on the face looks good. 8. Abuse of denitrification filter sewage treatment upgrade is a common problem all over the world, but in many places, on the basis of sufficient and redundant space in the aeration tank, a denitrification filter is added after the secondary sedimentation tank, which simply solves the total nitrogen problem , which is incredible. 9. On-line monitoring has become a standard configuration. Influent and effluent COD and ammonia nitrogen monitoring have become the standard configuration of various sewage treatment plants. If these on-line instruments are used for process monitoring, real-time monitoring of the process must have good meaning, but if it is only monitoring influent and effluent, it is worth pondering. 10. Ozone abuse If it is necessary to remove some odors, colors, or remove some new pollutants in the water while disinfecting, the ozone process may be more suitable. What's the point of simply chasing after sewage treatment if it's not for reuse?
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