Technology and system for treating petrochemical wastewater

Abstract

The invention provides a technology and a system for treating petrochemical wastewater. The technology is characterized in that a treatment method combining primary treatment, secondary treatment, biochemical treatment and deep treatment is adopted, the previous petroleum removal effect is enhanced, and the deep treatment type novel technology combination of 'ozone contact and aeration biologicalfilter tank' is additionally adopted, so that the contents of COD (chemical oxygen demand) and petroleum in the wastewater can be reduced, and the removal effect of petroleum and COD is enhanced; mostof NH3-N, TN, sulfide, volatile phenol and SS (suspended solids) can be removed, the drainage requirement is met, the petrochemical wastewater is effectively treated, and the drained water can stablyreach the standard. The treatment system comprises an adjusting petroleum removal tank, a loading and coagulation petroleum removal device, a coagulation and flocculation air floatation tank, an A/O(anoxic/oxic) biochemical tank, a secondary precipitation tank, a front ozone contact tank, an aeration biological filter tank, a clean water tank and the like. The system has the advantages that according to the conditions, the system can be newly built, or be modified on the original treatment system; the running is stable, the construction cost is effectively reduced, and the running cost is reduced.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a petrochemical wastewater treatment process and system. Background technique [0002] Petrochemical industry is a pillar industry of the national economy. With the rapid development of my country's economy, oil consumption continues to rise, the production scale of the petrochemical industry continues to expand, and the level continues to improve. The quality of petrochemical wastewater produced is complicated, diverse, and difficult to treat Keep increasing. Therefore, developing a reasonable and effective treatment process is a key way to meet people's ever-increasing environmental protection requirements. Petroleum chemical industry mainly uses petroleum as raw material, through a series of refining, fractionation, cracking, synthesis and other processing processes, to produce heavy oil, light oil, by-product gas, etc., and further react to synthesize various organic chemical p...

AI Technical Summary

Problems solved by technology

However, it is still difficult to meet the water quality indicators for subsequent water use or the new environmental protection discharge standards

CNOOC Huizhou, Sinopec Maoming and many other companies use the MBR method for engineering applications. The pre-treatment effect COD is stable below 60mg / L. After a period of operation, the membrane fouling is serious and the operation is unstable.

[0009] In addition, the expansion of production scale and the diversification of products in the petrochemical industry determine the diversity of waste water, which makes the waste water contain acids and esters, but the proportion of refractory substances such as hydrocarbons, sulfur nitrogen and benzene series Higher, these pollutants are difficult to remove by conventional biological means, and with the expansion of production scale and the continuous improvement of environmental protection standards, the original process has not adapted to the development requirements of the industry, and the effluent index seriously exceeds the standard. The traditional oil separation + air flotation + The biochemical "old three sets" process cannot meet the requirements. Therefore, in view of the water quality characteristics of high oil content, high COD content and low biodegradability (B / C<0.3) of the wastewater, the wastewater treatment process must be redesigned and implemented. Upgrade the treatment system to ensure the stability of the system operation while meeting the discharge standards

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