Device and method for optimized control over carbon source feeding in denitrification biofilter process

Abstract

The invention relates to a device for optimized control over carbon source feeding in a denitrification biofilter process. The device is provided with a denitrification biofilter, a carbon source box, a frequency-conversion carbon source pump, a carbon source flowmeter, a backwashing air pump and a backwashing air inlet valve; the denitrification biofilter is internally provided with an online-water-inlet nitrate sensor, an online-water-inlet dissolved oxygen sensor, an online-water-outlet nitrate sensor, a nitrate determinator, a dissolved oxygen determinator, a process controller, and an industrial personal computer; and a water inlet pipeline is provided with a water inlet pump, a water inlet valve and an online-water inlet flowmeter. A method for optimized control cover the carbon source feeding is characterized by comprising the following steps of: (1) introducing water; (2) processing and judging parameters; (3) processing frequency ft by a frequency converter; (4) preventing excessive feeding of a carbon source; (5) stably running; (6) diagnosing faults; and (7) performing backwashing. The device and the method disclosed by the invention can be widely applied to sewage advanced treatment and nitrogenous industrial wastewater treatment, is particularly suitable for producing high-quality recycled water, have the advantages of complete structure, precision for control, good effect and high efficiency.

Description

technical field [0001] The invention relates to a biological treatment technology for sewage regeneration and reuse, in particular to a device and method for optimizing and controlling carbon source addition in a denitrification biological filter process. Background technique [0002] In recent years, the rapid increase of China's economic aggregate has reduced the total amount of water resources. The increasingly serious water pollution has further exacerbated the tension of water resources, and the problem of water resources has become a bottleneck for the sustainable development of China's economy and society. Some large and medium-sized cities in China are already facing severe water shortages. Sewage reuse has great potential to solve the shortage of urban water resources. After proper regeneration treatment, sewage can be reused for river and lake landscapes, industrial cooling, green irrigation, etc. However, due to the limitation of the low concentration of organic ...

AI Technical Summary

Problems solved by technology

However, the current commonly used control methods, no matter how the influent nitrate concentration and influent water volume change, the carbon source pump runs at a constant speed, and the control accuracy is extremely low

Problems in this control method: ① When the nitrate concentration in the raw water is low, it may cause excessive dosing of carbon sources, resulting in excessive concentration of organic matter in the effluent water, and waste of carbon sources; ② When the nitrate concentration in the raw water is high , may result in insufficient carbon source dosage, resulting in too high nitrate concentration in the effluent, making it difficult for the total nitrogen (TN) in the effluent to meet the quality requirements of reclaimed water; Reach the best energy consumption level, easy to cause energy waste

Therefore, the traditional denitrification biofilter carbon source dosing control method still has the problem of insufficient control accuracy, which may easily cause waste of carbon source, increase production costs, and make it difficult to ensure that the reclaimed water reaches the standard stably.

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