餐厨垃圾湿热水解及其液相产物反硝化性能研究
Hydrothermal Hydrolysis of Food Waste and Denitrification Performance of its Liquid-phase Product
李懿南 1刘莹 2侯锋 2庞洪涛 2徐恒 3江乐勇 2周晓 2赵鹏宇 3陈湘泽 3舒新前 3王刚4
作者信息
- 1. 国投信开水环境投资有限公司,北京 101100;中国矿业大学(北京)化学与环境工程学院,北京 100083
- 2. 国投信开水环境投资有限公司,北京 101100
- 3. 中国矿业大学(北京)化学与环境工程学院,北京 100083
- 4. 北矿大(南京)新能源环保技术研究院有限公司,南京 210005
- 折叠
摘要
为了考察餐厨垃圾湿热水解的液相产物直接用于污水反硝化的可行性,研究了加水率、湿热水解方式(静态和动态)和水解时间(0～60 min)对餐厨垃圾液化效果、液相产物组成的影响,并对比了液相产物与葡萄糖的反硝化性能.结果表明:湿热水解,尤其是动态湿热水解,能促进固相有机质的液化,但提高加水率对提升餐厨垃圾液化效果影响有限.在加水率50％、动态湿热水解20 min的条件下,液相产物主要由碳水化合物和有机酸组成(碳水化合物占比为73.2％,有机酸占比为11.5％),液相产物VS占比为26％,液相产物COD浓度达到113310 mg·L-1,1 kg餐厨垃圾制备的液相产物COD总量达到88.0 g,液相产物C/N为66,是厌氧发酵液碳源的2倍左右.液相产物能达到与葡萄糖相近的比反硝化速率和比葡萄糖更高的反硝化潜能,可以替代葡萄糖充当慢速降解反硝化碳源.
Abstract
To determine the feasibility of liquid-phase product of hydrothermal hydrolysis of food waste for direct use in denitrification of wastewater,the effects of water addition rate,hydrothermal hydrolysis type(static and dynamic)and hy-drolysis duration(0～60 min)on the liquefaction performance of food waste and composition of the liquid-phase product were examined.Moreover,the denitrification performance of the liquid-phase product was compared with that of glucose.The results showed that hydrothermal hydrolysis,especially dynamic hydrothermal hydrolysis could promote the liquefaction of solid-phase organic matter.However,increasing the water addition rate had a limited effect on the liquefaction of food waste.With a 50％water addition rate and a dynamic hydrothermal hydrolysis duration of 20 mins,the liquid-phase prod-uct mainly consisted of carbohydrates and organic acids(73.2％carbohydrates and 11.5％organic acids),the VS propor-tion of the liquid-phase product was 26％and the COD concentration of the liquid-phase product reached 113310 mg·L-1.The total COD of liquid-phase product prepared from 1 kg of food waste reached 88.0 g,and the liquid-phase product had a C/N of 66,which was about double of that of carbon source of anaerobic fermentation solution.Compared to glucose,the liquid-phase product has a similar specific denitrification rate and higher denitrification potential,and can replace glucose as a slow-degrading carbon source for denitrification.
关键词
餐厨垃圾/湿热水解/碳源/液相产物/反硝化Key words
food waste/hydrothermal hydrolysis/carbon source/liquid-phase product/denitrification引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据