High-efficiency intelligent backwashing system of upward flow biological filter

Abstract

The invention discloses an efficient intelligent backwashing system of an upward flow biological filter. The problems that the removal efficiency of pollutants is influenced due to overlarge backwashing strength of a conventional upward flow biological filter, the filter is frequently backwashed due to insufficient backwashing strength or short backwashing time, and even a filter material of the biological filter is hardened and a filter plate is turned over due to insufficient backwashing in the prior art are solved. The problems that the impact of frequent backwashing of an upward flow biological filter on a front-end pretreatment unit at present and the additional increase of the operation cost caused by the impact are solved. By means of the efficient intelligent backwashing system, early warning is achieved in advance, uncertain factors of human intervention are reduced, overall hardening of the filter tank is stopped in advance, and normal operation of the filter tank is guaranteed. The system has great popularization and application values in the field of upward flow biofilter processes.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a high-efficiency intelligent backwashing system for an upward flow biological filter. Background technique [0002] With the increasingly prominent problem of water pollution in my country, the improvement of urban sewage treatment and discharge standards has become the general trend. The biofilm sewage treatment technology has been widely studied and applied. The advantages of low cost, small infrastructure investment, high treatment load, convenient operation and management, and good treatment effect are widely used in the field of advanced sewage treatment. The upflow biofilter has no sludge discharge system and operates periodically, requiring regular backwashing. It is a complete cycle from the beginning of filtration to the end of backwashing. The specific process is as follows: the pretreated sewage enters the filter material layer from the lower part of the filter tank th...

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Problems solved by technology

[0003] The current upflow biological filter "precipitation level + air-water combined method" backwashing, through the operation of precipitation level, although the problem of blockage of the filter head of the water distribution and air distribution system of the biofilter is solved, the biofilter is still in operation. There are still many problems: ① In order to prevent the hardening of the filter material from affecting the normal operation of the filter, the backwash intensity should be increased, but if the backwash intensity is too high, the efficiency of the filter to remove pollutants will be reduced, and the effluent water quality cannot be guaranteed to meet the standard Discharge; ②Insufficient backwashing intensity or too short backwashing time will easily lead to frequent backwashing of the filter and even cause compaction of the filter material of the biological filter due to insufficient backwashing. Production accidents; ③Frequent backwashing, the backwashing wastewater is lifted to the front-end pretreatment unit by the lift pump and enters the system for secondary treatment, which will increase the processing load of the pretreatment unit and increase the cost of secondary treatment of backwashing wastewater , causing the overall operating cost to remain high, which does not conform to the principle of stable economic operation

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