Method for promoting ferment acid production of excess sludge through soapnut saponin production leftovers

Abstract

The invention discloses a method for promoting ferment acid production of excess sludge through soapnut saponin production leftovers. The method includes the steps of firstly, drying the soapnut saponin production leftovers; secondly, putting the soapnut saponin production leftovers into concentrated excess sludge; thirdly, conducting anaerobic fermentation on the excess sludge; fourthly, conducting solid-liquid separation on ferment liquid to obtain clear liquid containing volatile fatty acid. By adding the soapnut saponin production leftovers, the hydrolysis fermentation acid yield of the excess sludge is increased, and meanwhile the resource utilization of the soapnut saponin production leftovers and the consumption decrease of the excess sludge are achieved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for using sapindus saponins to produce leftovers to promote the fermentation of excess sludge to produce acid. Background technique [0002] Soapberry saponin is the extract of the wild deciduous tree Sapindus fruit peel, and its glycosides are mainly triterpene saponins (I) and sesquiterpene glycosides (II), all of which have strong surface activity. Natural non-ionic surfactant and emulsifier, which can reduce the surface tension of water, have good foaming performance and decontamination ability, and have no harm to the environment and human body, and can effectively wash away the pollution attached to the skin surface Various heavy metal particles, and the cleaning ability is better than most other detergents. [0003] In addition to a certain amount of sapindus saponin, the leftovers of sapindus saponin extracted by water extraction also contain ru...

AI Technical Summary

Problems solved by technology

At present, in the process of domestic sewage treatment in southern cities, there is a common problem of low carbon-nitrogen ratio. It is often necessary to add external carbon sources to achieve the purpose of nitrogen and phosphorus removal. However, adding external carbon sources will not only increase operating costs, but also In the process of sewage treatment, it will be converted into excess sludge, further increasing the output of excess sludge

Studies have found that the presence of chemical surfactants in excess sludge can increase the hydrolysis rate of excess sludge and increase the production of short-chain fatty acids, but most of them currently use chemically synthesized surfactants, rhamnolipids synthesized by microbial metabolism, and Surfactants extracted from the environment, etc., microbial fermentation and plant-extracted surfactants have a high cost, and are not economical compared with chemical surfactants

However, there is a hidden danger of secondary pollution in chemical surfactants