Advanced treatment and recycling process and apparatus for sewage reaching standard

Abstract

The invention relates to an advanced treatment and recycling combined apparatus with petrochemical sewage reaching the standard as a water source. The apparatus comprises an air floatation filter tank, an ozone reaction tank, an immobilized microorganism biological aerated filter, a V-shaped filter tank, an ultrafilter and a reverse osmosis filter, which are successively connected. The invention also provides a process for advanced treatment and recycling of the sewage by using the apparatus so as to obtain circulating water supplemental water. The process comprises the following steps: allowing the sewage to enter into the air floatation filter tank at first so as to remove oil, lightweight floc and suspended solids in the sewage; then allowing the sewage to enter into the ozone reaction tank to degrade organic matters difficult to degrade, thereby improving biodegradability of the sewage; allowing the sewage to enter into the immobilized microorganism biological aerated filter to remove organic matters and ammonia nitrogen in the sewage; allowing the sewage to enter into the V-shaped filter tank to remove suspended solids and suspending organic matters in the sewage; then allowing effluent of the V-shaped filter tank to enter into the ultrafilter so as to remove suspended solids and colloidal organic matters; and allowing effluent of the ultrafilter to enter into the reverse osmosis filter for reverse osmosis so as to remove salt and finally, delivering effluent to water consumption sites of circulating water supplemental water.

Description

technical field [0001] The invention relates to a process technology for advanced treatment and reuse of up-to-standard sewage in petrochemical enterprises, especially the use of air flotation filter-ozone reaction tank (dosing ozone)-immobilized microbial aerated biological filter-V-type filter-ultrafiltration -Reverse osmosis combined process technology. Background technique [0002] Petrochemical enterprises are large water users. With the increasing scarcity of water resources, the supply of water sources has become a restrictive factor restricting the expansion and increase of production. In order to reduce water consumption per ton of oil and ensure the sustainable development of the enterprise, advanced treatment of up to the standard sewage can be reused as circulating water supply water, which can bring certain economic and environmental benefits. [0003] The air flotation filter is a process combining the dissolved air flotation tank and the integrated filter mat...

AI Technical Summary

Problems solved by technology

[0008] Compared with circulating water and supply water, petrochemical enterprises’ standard sewage contains suspended solids, oil, organic pollutants, ammonia nitrogen, and total dissolved solids that exceed the standard. At the same time, the C / N is low and the biodegradability is poor, which is not conducive to the growth of microorganisms and the degradation of organic matter. degradation

In the application of advanced sewage treatment and reuse processes in petrochemical enterprises, the above-mentioned processes are not effective in treating organic pollutants and ammonia nitrogen. The ultrafiltration-reverse osmosis double-membrane process is prone to organic and microbial pollution. It needs to be developed for petrochemical enterprises to meet the standard sewage Advanced treatment and reuse technology and equipment for water quality characteristics

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