Neutralization-free furfural wastewater biochemical treatment process

Abstract

The invention relates to biochemical treatment technology for unneutralized furfural wastewater. The furfural wastewater enters into an emergency reservoir first; partial furfural wastewater produced during production of furfural each day enters into a regulating reservoir, and the other part of the furfural wastewater enters into the emergency reservoir; the furfural wastewater in the emergency reservoir is extracted and pumped into the regulating reservoir by a temperature adjusting pump, and the temperature of the furfural wastewater in the regulating reservoir is adjusted to be between 35 and 40 DEG C; the furfural wastewater is lifted by a sewage pump into an anaerobic sequencing-batch reactor, and is fully mixed with anaerobe; a large part of organic pollutant is decomposed into methane and water under the physiological action of the anaerobe; when the pH of a solution in the anaerobic sequencing-batch reactor is raised to be between 7.0 and 7.2, operation of a circulating pump and a pulse feeder is stopped for entering into a precipitation stage; after precipitation, the water flows into an intermediate reservoir through a siphonic decanting drainer; and the wastewater in the intermediate reservoir is lifted by an intake pump of a sequencing-batch activated sludge process, enters into a reservoir of the sequencing-batch activated sludge process according to operation rules of the sequencing-batch activated sludge process, is purified, enters into a clean water reservoir, is subjected to strong oxidation treatment of ozone, and is released after reaching the standard.

Description

technical field [0001] The invention relates to a waste water treatment process, which is a process for biochemical treatment of neutralization-free furfural waste water. Background technique [0002] The current furfural wastewater treatment technologies mainly include physical, chemical and biochemical methods. [0003] (1) Physical method: mainly multi-effect evaporation process and membrane filtration process. The multi-effect evaporation process uses the primary steam generated by the boiler to evaporate waste water to generate secondary steam, and the secondary steam enters the hydrolysis pot for furfural production for furfural production. After the scale generated in the multi-effect evaporator is cleaned out, it enters the boiler for incineration. Thereby realizing zero discharge of furfural production wastewater. The problem with this process is that all substances with a boiling point below 170°C in the furfural wastewater enter the hydrolysis pot with the secon...

AI Technical Summary

Problems solved by technology

The operating cost is high, and the treatment cost per ton of furfural wastewater is about 8-10 yuan

[0006] (3) Biochemical method: The biochemical treatment process has lightning solution anaerobic Aerobic process, neutralization Upflow Anaerobic Sludge Bed Reactor Contact oxidation, neutralization Upflow Anaerobic Sludge Bed Reactor Sequencing batch activated sludge process and other processes, the flash decomposition process can remove part of CODcr and increase the pH, and can decompose some refractory organic matter, but at the same time it also brings red color to furfural wastewater, which is difficult to obtain in subsequent processes. remove

Moreover, the calcium ion concentration and sodium ion concentration after neutralization are very high. High calcium ion concentration (5000mg / L) and sodium ion concentration (7000mg / L) will inhibit the activity of anaerobic bacteria, making the anaerobic treatment unit and aerobic The processing unit has poor performance and instability in actual engineering, and it is difficult to achieve emission standards

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