Novel process for cleaning filter material in biological filter

Abstract

The invention discloses a novel process for cleaning a filter material in a biological filter. The novel process comprises the process steps of adding a surfactant sodium alcohol ether sulphate and a reagent oxalic acid, accounting for 8-12% of the volume of the water in the biological filter, into the biological filter, cleaning the filter material in the biological filter, introducing air to perform aeration, stirring for 20-40 minutes, stopping introducing air, and then soaking for 18-30 minutes; performing high-airflow backwashing aeration for 1-3 hours, stopping aeration, standing for 20-40 minutes, quickly performing pollution discharge for 3-5 minutes, performing air-water joint backwashing for 1-3 hours, stopping air washing, and performing clear water backwashing for 20-40 minutes; discharging all the sewage in the biological filter, inputting water into the biological filter again to perform air-water joint backwashing for 1-3 hours, and performing clear water backwashing for 20-40 minutes until the content of the surfactant sodium alcohol ether sulphate in the water is lower than 5mg / l. According to the process disclosed by the invention, the sewage treatment capacity can be effectively strengthened, and the activity of biological bacteria is enhanced.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a novel biological filter material cleaning process. Background technique [0002] The biological aerated filter (BAF) process is a new type of sewage treatment process that emerged in Europe and the United States in the late 1980s and early 1990s. It was first used for tertiary treatment, and then developed to be directly used for secondary treatment. It is widely used in domestic sewage and industrial wastewater treatment. At present, more than 100 sewage treatment plants in the world have applied this technology. With the deepening of research, biological aerated filter has gradually developed from a single process to a series of comprehensive processes. It has the functions of removing SS, COD, BOD, nitrification, denitrification and phosphorus removal. [0003] Due to the late start of our country's biological aerated filter technology, there are still some deficiencies in its...

AI Technical Summary

Problems solved by technology

The main disadvantages are that the aeration head is easy to block, needs to be replaced regularly, the aeration is uneven, the broken rate of artificial ceramsite filter material is high, and the water quality is unstable for a period of time after backwashing

Thus affecting its effluent water quality and application

After a period of operation, the filter material will be clogged and hardened. This patent is a new type of biological filter filter material cleaning process, which can solve this problem.