A method for cultivating and treating halophilic granular sludge from high-salt wastewater

Abstract

The invention relates to a method for cultivating halophilic granular sludge, which belongs to the field of sewage biological treatment. The principle of the invention is as follows: (1) rapidly increasing the influent load to stimulate EPS secretion of halophilic microorganisms. Microorganisms attach and grow through the binding of EPS, and form mature halophilic active granular sludge under the action of hydraulic shear force; (2) The combined effect of long and short settling time. The long precipitation time in the early stage can achieve the growth of halophilic microorganisms in the reactor; the short precipitation time in the later stage can provide selective pressure for granulation. The halophilic activated granular sludge cultivated in the present invention has various sludge sources and simple technology. Since the enriched microorganisms come from the halophilic bacteria group deposited in the estuary, the salinity tolerance range is between 1% and 10%. And can retain the compact shape structure. It greatly shortens the precipitation time, effectively shortens the treatment cycle and ensures the treatment effect, realizes the rapid treatment of high-salt wastewater, realizes short-range nitrification, and reduces energy consumption by 30%.

Description

technical field [0001] The invention proposes a method for cultivating halophilic granular sludge to realize biological treatment of high-salt wastewater. The invention belongs to the field of sewage biological treatment, especially the field of high-salt wastewater biological treatment. Background technique [0002] Since high-salt wastewater contains a large amount of inorganic salts, freshwater microorganisms cannot survive in a high-salt environment and cannot achieve the function of pollutant degradation. Aiming at how to improve the salt tolerance of microorganisms to realize the biological treatment of high-salt wastewater, researchers have proposed many solutions. Some researchers proposed to improve the salt tolerance of freshwater activated sludge by means of salinity acclimation. For example, patent application number CN200910191713.X proposes a device and method for domesticating ordinary freshwater activated sludge to construct a high-salt wastewater biologica...

AI Technical Summary

Problems solved by technology

Although there have been many studies on the granulation technology of freshwater activated sludge, the granulation technology of halophilic sludge has not been reported.

This is mainly because the biological and physiological characteristics of halophilic sludge are significantly different from those of freshwater activated sludge, and the freshwater sludge granulation method cannot be directly applied to halophilic sludge.

In addition, to achieve granulation in this special high-salt environment needs to overcome the physical conditions of osmotic pressure environment and high dispersion, which increases the difficulty of halophilic sludge granulation

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