Treatment method of waste engine oil/lubricating oil regeneration distillation wastewater

Abstract

The invention discloses a treatment method of waste engine oil / lubricating oil regeneration distillation wastewater, and belongs to the technical field of environmental protection. The method comprises the following steps: firstly, pumping waste engine oil / lubricating oil regeneration distillation wastewater into an intermittent reaction tank, adjusting the pH value to be acidic, then carrying out low-temperature evaporation by adopting a low-temperature evaporator, discharging an obtained concentrated solution into a solid-liquid separation device, and discharging distilled water generated by evaporation into a distilled water collection barrel; carrying out solid-liquid separation on the obtained concentrated solution, discharging the filtrate into an intermittent reaction tank, and carrying out circulating evaporation until all wastewater in the intermittent reaction tank is evaporated into solids; adding alkali into distilled water generated by evaporation to adjust the pH value to be neutral, supplementing a nitrogen source, a phosphorus source or domestic sewage, and then lifting to an anaerobic tower for anaerobic biogas production reaction; effluent of the anaerobic tower enters an aerobic biological reaction tank; effluent of the aerobic biological tank enters a secondary sedimentation tank or an MBR membrane tank for mud-water separation; clear liquid is discharged after reaching the standard, and sludge enters a solid-liquid separation device to be subjected to dehydration treatment. The treatment method has no residual mother liquor, and the treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a treatment method for waste engine oil / lubricating oil regeneration distillation wastewater. Background technique [0002] With the increase of machinery and vehicles, the usage of engine oil / lubricating oil is increasing day by day. After the engine oil / lubricating oil has been used for a period of time, when the lubrication and its performance indicators decrease to a certain extent, the oil must be changed to ensure the normal operation of the equipment. Lubricating oil replacement will produce a large amount of waste hydraulic oil, gear oil and dirty oil for washing machine parts Wait. Since waste lubricating oil also contains a large amount of valuable lubricating oil base oil, the recycling and utilization of waste lubricating oil is not only conducive to saving resources, turning waste into treasure, making full use of petroleum resources, but also preve...

AI Technical Summary

Problems solved by technology

There are mainly the following problems: 1) Conventional evaporation techniques are all evaporated under neutral conditions. Since ammonia nitrogen and organic nitrogen are volatile substances under neutral conditions, this leads to a large amount of ammonia nitrogen and organic nitrogen in wastewater being transferred to Distilled water, resulting in the need to build complex distilled water denitrification processes, such as membrane concentration, denitrification biochemical treatment reactors, etc.; The evaporated mother liquor (moisture content is still higher than 50%), because the mother liquor contains high concentration of organic matter, its viscosity is very high, it is easy to block the pipeline, so it is often used as hazardous waste for outsourcing disposal; 3) For waste engine oil regeneration distillation wastewater, traditional evaporation All appliances use fresh steam or electricity, resulting in a comprehensive evaporation cost of more than 100 yuan per ton of water

The above problems lead to high investment and operating costs of the waste engine oil regeneration distillation wastewater treatment device, and the burden on the enterprise is relatively large.

[0004] Patent CN111410382A discloses a combined process using three-effect evaporation + three-stage RO + ozone catalysis + multi-stage AO + MBR. The three-effect evaporation concentrated liquid and the three-stage RO concentrated liquid are then incinerated to recover heat energy. The main disadvantages of this method are: 1) The investment and operating costs are very high, mainly from three-effect evaporation, three-stage RO, ozone catalyst and incinerator; 2) three-effect evaporation and three-stage RO will produce more than 30% of the concentrate; 3) due to the The concentration of ammonia nitrogen and total nitrogen is very high, and the concentration of ammonia nitrogen and total nitrogen in the distilled water produced by three-effect evaporator evaporation is still high, resulting in the need for complex distilled water denitrification treatment process; 4) The concentrated solution contains chlorine, and the incinerator operation is risky. Flue gas treatment needs to avoid the generation of dioxins, and the process is complicated

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