with the rapid development of the national economy, the state and society have paid more and more attention to the protection of the environment and the emission requirements for sewage treatment have become higher and higher. since the “thirteenth five-year plan”, the drainage standards have been upgraded from level 1 b to level 1 a. most of the original sewage treatment plant process can no longer meet the existing requirements. companies in the industry have invented their own upgrade methods in response to different difficulties in refitting and water standards.
drainage standard diagram
shenzhen qingquan abm combination process came into being. the abm combination process is a wastewater treatment method (method) that is organically combined by activated sludge and biofilm (biofilm). this technology is based on ao/aao biological pool. the baf and the multifunctional deep bed filter (mdf) are the core components, which are particularly suitable for the urban sewage treatment plants to upgrade the standard (dilatation) or new construction.
abm combination process flow chart
qingquan abm combination process has the following features in the application of standard expansion in sewage treatment plants.
1. solve the conflict between the age of nitrifying bacteria and polyphosphate bacteria
phosphorus-accumulating bacteria used a short sludge age in the activated sludge stage. the nitrifying bacteria existed independently at the biofilm stage. phosphorous bacteria and nitrifying bacteria no longer interfered with each other.
2. sludge settlement performance is good, to avoid sludge swelling
because of the short residence time of activated sludge in the abm process, it can inhibit the growth of filamentous bacteria and avoid sludge swelling. generally svi is less than 100 ml/g, and sludge sedimentation performance is good.
3. no loss of nitrifying bacteria, high nitrification efficiency
the phase of baf biofilm in the presence of nitrifying bacteria is a fixed-bed reactor with no excess sludge emissions, effectively preventing the loss of nitrifying bacteria. in addition, nitrifying bacteria are always in an aerobic environment and do not suffer from anaerobic decay, which greatly increases the nitrification efficiency.
4. elimination of the effect of nitrates in return sludge on phosphorus release from polyphosphates
in the activated sludge stage, the aerobic tank uses a short sludge age, and no nitrification reaction occurs in the control tank. this prevents the nitrate from flowing back to the anaerobic tank through the sludge and inhibits the growth of the phosphorus accumulating bacteria, thus solving the problem of competing for carbon sources of anoxic tank and nitrification reaction. contradictions ensure the effectiveness of simultaneous biological nitrogen and phosphorus removal.
qingquan abm combination process has obvious advantages compared with the existing process in the industry. we took the 80,000 m3/d sewage treatment plant to upgrade the project as an example. the comparison between the mbr process system and qingquan abm combined process system is as follows:
why is there such a clear advantage? the abm process adopts a patented upstream flow filter (patent number: 201320226168.5) independently developed by qingquan, a non-clog aerated biological filter process (patent no.: zl 2005 1 0033319.5) and a modular water treatment equipment product. workshop production line, on-site assembly, without changing the original structure, make full use of the original technology.
shenzhen qingquan was founded in 1995 and has been striving for the development and production of intelligent modular water treatment technology and equipment for 23 years. it has obtained dozens of patents for filter tanks and more than 500 successful projects. it is the upstream flow of the national urban water supply and drainage industry. the design draft of the filter tank design standard, the representative enterprise of non-membrane water treatment technology, and the leader of the intelligent modular water treatment equipment, the company continues to provide provincial and provincial water supply and drainage system upgrades to the world with its strong technical strength. timely, labor-saving, cost-effective industry operations solutions.
