Method and system for treating F-T (Fischer-Tropsch) synthetic wastewater

Abstract

The invention discloses a method and a system for treating F-T (Fischer-Tropsch) synthetic wastewater. The method for treating the F-T synthetic wastewater comprises the following steps: S1, performing oil removing pretreatment on the F-T synthetic wastewater; S2, adjusting a pH (Potential of Hydrogen) value of the F-T synthetic wastewater subjected to the oil removing pretreatment, and improving the pH value of the F-T synthetic wastewater; S3, adding a nitrogen and phosphorus nutrient source, and performing anaerobic biological treatment on the F-T synthetic wastewater subjected to the pH value adjustment. In the method disclosed by the invention, the F-T synthetic wastewater is sequentially subjected to the oil removing pretreatment and the anaerobic biological treatment, so that organic matters of alcohol, aldehyde, ketone, ester and the like in the wastewater are degraded and are converted into biogas serving as clean energy, and resources are effectively recycled while the cost is reduced. After the wastewater is subjected to the anaerobic biological treatment, COD (Chemical Oxygen Demand) is greatly reduced, the biodegradability of the wastewater is improved, a treatment load of a following technique is reduced, and a good foundation is laid for discharge up to the standard or recycling of the wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an F-T synthetic wastewater treatment method and system. Background technique [0002] my country is a country rich in coal but short of oil. With the development and progress of society, the oil consumption required by people's production and life is increasing day by day. The use of coal indirect liquefaction to produce synthetic oil is an important way to solve the shortage of petroleum resources, and the Fischer-Tropsch synthesis reaction is the core reaction of coal indirect liquefaction. Fischer-Tropsch synthesis reaction, also known as F-T reaction, refers to the synthesis gas (H 2 +CO), a process in which iron or cobalt is used as a catalyst to convert it into hydrocarbon fuel under certain temperature and pressure. Hydrocarbons with different chain lengths are processed to form refined oils such as gasoline and diesel. In addition to producing hydrocarbon...

AI Technical Summary

Problems solved by technology

[0005] Regarding the distillation and separation method, Chinese patent CN200610144207.1 provides a treatment method for Fischer-Tropsch synthesis reaction water, using a multi-effect evaporation system to distill and separate the F-T synthesis wastewater, adding corrosion inhibitors, scale inhibitors, bactericides, etc. Treatment, the treated water meets the quality requirements of circulating water, but the operation is cumbersome and costly

The Chinese patent CN1617917A adopts the method of separation to separate and recover the oxygen-containing compounds. This method is to heat the waste water to above 100°C for distillation operation. The required energy consumption is large, the alkali consumption is large, and the cost is high, which is not satisfactory. Principles of Energy Conservation

This method is simple in operation and low in energy consumption, but it requires a large amount of oxidant, and the oxidant converts all available substances into acids to form precipitates. secondary pollution

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