Slow-release solid carbon source, application thereof and sewage treatment device

Abstract

The invention relates to the technical field of sewage treatment, in particular to a slow-release solid carbon source, application thereof and a sewage treatment device. The slow-release solid carbon source comprises a corncob solid carbon source and a polymer modified polyurethane solid carbon source in a volume ratio of (4-50): 1; the corncob solid carbon source is obtained by sequentially carrying out acid treatment, alkali treatment and ultraviolet treatment on corncobs; the preparation method of the polymer modified polyurethane solid carbon source comprises the following steps: S1, thermoplastic polyurethane and a modifier are subjected to a melt blending reaction to obtain a thermoplastic polyurethane melt; s2, the thermoplastic polyurethane melt and a carbon source react through a melt blending method, and a blend is obtained; and S3, carrying out casting molding on the blend to obtain the polymer modified polyurethane solid carbon source, the weight ratio of the thermoplastic polyurethane to the modifier to the carbon source is 1: (0.5-2): (5-20). The denitrification effect of sewage treatment is improved.

Description

technical field [0001] The present application relates to the technical field of sewage treatment, in particular to a slow-release solid carbon source and its application, and a sewage treatment device. Background technique [0002] The traditional biological denitrification treatment process mainly uses microorganisms to carry out denitrification and denitrification under anoxic conditions. Denitrifying bacteria use carbon sources as electron donors to reduce nitrate nitrogen and nitrite nitrogen in water to nitrogen to achieve denitrification. effect of nitrogen. The carbon-nitrogen ratio (C / N) in water should be kept above 5 to achieve significant denitrification efficiency. However, in the actual operation of sewage treatment projects, the traditional biological denitrification process has many shortcomings. For example, when the C / N of sewage is low, microorganisms cannot carry out denitrification due to insufficient carbon source, and additional carbon source is requi...

AI Technical Summary

Problems solved by technology

[0004] Among them, liquid carbon sources include methanol, glucose, acetic acid, sodium acetate, etc., which have the characteristics of easy dissolution and fast reaction speed, but adding soluble carbon sources may easily cause insufficient or excessive dosage, which not only increases the cost of denitrification , and lead to more prominent problems such as complicated system operation and secondary pollution

[0005] Solid carbon sources can be divided into three categories: one is synthetic biodegradable polymers, such as synthetic polyhydroxyalkanoate (PHA), polylactic acid (PLA), polycaprolactone (PCL ) and other materials, the main characteristics of this material are relatively high price, single nutrition, and limited application; the second type is natural materials mainly cellulose, such as licorice, reed, corncob, wheat straw, etc., its mechanical strength Low and short service life; the third category is a new type of composite material that is synthesized by adding natural materials

The solid carbon source can slowly release the carbon source under the synergistic effect of physics and biology, which solves many unfavorable problems such as difficult control of dosage or excessive initial release.

Images