Multi-stage treatment process for biodiesel wastewater

Abstract

The invention provides a multi-stage treatment process for biodiesel wastewater, which comprises the following specific operation steps: introducing biodiesel wastewater into a flocculation precipitation tank, and adding flocculant to perform flocculation precipitation reaction so as to remove part of solid impurities; transferring the biodiesel wastewater into an oil separation conditioning tank, and performing oil separation treatment to remove floating oil in the wastewater; transferring the wastewater subjected to the oil separation treatment into a neutralization reaction tank, and adding Na2CO3 to remove hydrochloric acid in the wastewater; filtering the wastewater, introducing into an evaporator, and performing single-effect evaporation; performing condensation treatment on the wastewater subjected to the evaporation, and sequentially performing anaerobic treatment and aerobic treatment on the wastewater subjected to the condensation treatment; introducing the wastewater into a clarification tank, precipitating to remove biomass in the wastewater; and finally, discharging the wastewater treated in the clarification tank, and concentrating, drying and discharging the sludge precipitate in the clarification tank. According to the invention, better oil removal effect can be achieved; and the effluent water quality of the treated wastewater meets the wastewater emission standard.

Description

【Technical field】 [0001] The invention relates to a waste water treatment process, in particular to a multi-stage treatment process for biodiesel waste water. 【Background technique】 [0002] In the context of the global energy crisis, the production of biodiesel has emerged, but it is also accompanied by the pollution of production wastewater. In order to avoid the pollution of biodiesel wastewater to the water environment, the treatment of such wastewater is becoming one of the urgent problems to be solved. [0003] At present, there are many treatment methods for oily wastewater, mainly including physical chemical method and biological method. Among them, the physical and chemical methods mainly include adsorption method, membrane separation method, coarse granulation method, flotation method, electromagnetic method, electrocoagulation method, electric flotation method, flocculation method, etc. The biological methods mainly include activated sludge method and biofilm me...

AI Technical Summary

Problems solved by technology

[0004] There are many types of physical and chemical methods, high efficiency, wide application range, and good treatment effects, but there are common defects such as large energy consumption and high operating costs.

The existing biological treatment of oily wastewater has the advantages of mature technology, strong adaptability, and low operating costs, but its infrastructure costs are high and the requirements for influent water quality are relatively high. Therefore, it is mainly used as an advanced treatment process for the removal of dissolved oil

[0005] In summary, although there are many treatment methods for oily wastewater, each method has limitations. In actual use, it is necessary to determine which corresponding method to use according to the characteristics of oily wastewater.

In addition, if a single oily wastewater treatment method is used, it is difficult to achieve a good degreasing effect.

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