Method for culturing and treating halophilic granular sludge of high-salt wastewater

Abstract

The invention discloses a method for culturing halophilic granular sludge, and belongs to the field of biological treatment of sewage. The principles of the invention are as follows: (1) water inflowload is rapidly increased, and EPS secretion of halophilic microorganisms is stimulated. The microorganisms grow in an attached manner through the binding action of EPS, and mature halophilic active granular sludge is formed under the action of hydraulic shearing force; and (2) long precipitation time and short precipitation time act in a combined manner. At the long precipitation time in the early stage, growth of the halophilic microorganisms in a reactor is achieved; and at the short precipitation time in later stage, selective pressure is provided for granulation. According to the halophilic active granular sludge formed by culture in the invention, sludge sources are various, the technology is simple, the salinity tolerance range is between 1% and 10% due to the fact that the enrichedmicroorganisms come from the halophilic flora of settled sludge at a sea inlet, and a compact morphological structure can be kept. The precipitation time is greatly shortened, the treatment period iseffectively shortened, the treatment effect is guaranteed, rapid treatment of the high-salt wastewater is realized, the short-cut nitrification is realized, and the energy consumption is reduced 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

Images