Fully-biodegradable slow-release solid carbon source capable of being directly released and preparation method and application of fully-biodegradable slow-release solid carbon source

Abstract

The invention discloses a fully-biodegradable slow-release solid carbon source capable of being directly released and a preparation method and application of the fully-biodegradable slow-release solidcarbon source, and relates to the technical field of sewage treatment. The problems of difficult release, a low utilization rate, pollution in the slow release process and a complicated manufacturingprocess of existing slow-release carbon sources are solved. The slow-release solid carbon source is prepared through coating of a biodegradable solid carbon source by using a biodegradable material,and the biodegradable material comprises a biodegradable cotton web and biodegradable non-woven fabric covering the cotton web; the weight of the biodegradable solid carbon source accounts for 90% orabove of the total weight of the slow-release solid carbon source, and includes a carbon source matrix and a binder, and the carbon source matrix is prepared through compounding of a short-chain carbon source, a cellulose material, artificial degradable nanofiber spinning filament, microbial prebiotic factor sulfate and vitamins. The slow-release solid carbon source has the advantages of low production cost, environmental friendliness, no pollution and the like, and when the slow-release solid carbon source is used as a slow-release carbon source for biological denitrification in a sewage treatment process, the carbon source can be released stably in a short period of time.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, more specifically, it relates to a fully biodegradable slow-release solid carbon source that can be put in directly and its preparation method and application. Background technique [0002] With the development of my country's economy, the excessive use of nitrogen-containing waste, coupled with the illegal discharge of industrial wastewater, has led to a sharp increase in the aggregate nitrate content of groundwater, especially shallow groundwater, and groundwater pollution has become increasingly serious. [0003] At present, the treatment technologies for nitrate in water mainly include physical remediation technology, chemical remediation technology and biological remediation technology, among which biological denitrification remediation technology has become the most widely used treatment method because of its better treatment effect. In the process of biological denitrification, de...

AI Technical Summary

Problems solved by technology

In fact, during use, after the viscose fiber slowly releases the carbon source and hangs the film, what is in close contact with the fiber is the biofilm formed by the anaerobic bacteria in the inner layer, and the anaerobic bacteria degrade the viscose fiber very slowly. The effect is not obvious, and the contact area and the amount of fiber need to be greatly increased. The shedding of the biofilm will cause the blockage of the filter material of the biofilter, and the fiber will also affect the filtration efficiency of the filter material, so it is not good for the denitrification biofilter. Be applicable

In addition, wet spinning not only requires various and bulky dope preparation and pre-spinning preparation equipment, but also coagulation bath, circulation and recovery equipment. higher cost

[0009] According to the review, the existing slow-release carbon sources have the following defects: 1) The slow-release rate is uncontrollable; 2) The carbon chain of the slow-release is too long to be directly used, the utilization rate is low, and the effect is not good; 3) During the slow-release process , will release pollutants such as nitrogen and phosphorus at the same time, causing secondary pollution; 4) The larger cellulose structure is easy to block the filter holes of the filter material; 5) The preparation process is complicated and the cost is high, etc.

Images