Combined treatment process for cotton pulping black liquid and saponin wastewater

Abstract

The invention provides a combined treatment process for cotton pulping black liquid and saponin wastewater. The combined treatment process comprises the steps of mixing the cotton pulping black liquid and the saponin wastewater, carrying out acidification on the mixed liquid, separating the mixed liquid and removing lignin and suspended solids dissolved out in the mixed liquid to obtain treating fluid A; adding zero-valent iron and hydrogen peroxide into the treating fluid A, stirring for reaction and completing the reaction to obtain treating fluid B, wherein the structures of complex macromolecule organic matters in the treating fluid B are damaged; adding lime slurry into the treating fluid B, regulating pH value of the treating fluid B to be neutral, converting sulfate ions in the treating fluid into calcium sulfate to be precipitated out and dissolved out, separating to remove the calcium sulfate to obtain treating fluid C; treating the treating fluid C by an anaerobic UASB (Upflow Anaerobic Sludge Blanket) reactor and an MBR (Membrane Biological Reactor) for aerobic biological treatment, separating by a membrane separation system to obtain final yielding water, and reutilizing the final yielding water or discharging. The combined treatment process can realize treatment of wastes with processes of wastes against one another, is energy-saving, reduces energy consumption, improves the wastewater reuse rate and reduces the water consumption.

Description

Technical field [0001] The invention provides an industrial wastewater treatment process, in particular to a combined treatment process of cotton pulp black liquor and saponin wastewater, belonging to the technical field of environmental protection and wastewater treatment. Background technique [0002] Cotton pulp black liquor and saponin wastewater are the two most difficult wastewaters in the water pollution treatment industry today. Cotton pulp black liquor has the characteristics of high COD, high chroma, and high refractory degradation, and saponin wastewater is known as the "king of wastewater". The treatment of these two types of wastewater has always been a problem that water pollution control workers have continuously studied and worked hard to overcome, and it is also a bottleneck restricting the development of related cash crop planting and processing industries. [0003] At present, although there have been many academic papers and invention patents related to the tre...

AI Technical Summary

Problems solved by technology

In practical application, many cotton pulp and saponin production enterprises are faced with the difficulty in the operation and management of sewage treatment process facilities, the quality of effluent water is not up to standard, or the investment and operation costs of sewage treatment are too high

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