摘要
以固液混合态的养殖废物为原料,通过设计和运行自热式高温好氧反应器,研究了生产固液混合肥的好氧发酵工艺。结果表明,含水率为80%的鸡粪污水,在0.4m·3h-1的通气条件下好氧发酵,底物在3～4d内迅速升温至55℃以上,并保持5d。发酵过程中pH值维持在7左右,氨气排放量通常低于0.1mg·d-1,溶解氧含量维持在0.15mg·L-1左右,有效氮和有效磷的比例大幅升高,致病菌消减率可达90%。可见固液混合态养殖废物不需经过固液分离便能够进行自热好氧发酵,并能缩短反应周期,在各项监测指标上均比兼性或厌氧工艺更为有利。
A pilot scale fermentation experiment with livestock waste, which is one of main pollutants to the surface water in countries, was carried out to study the technical feasibility of producing solid-liquid mixing fertilizer and the fermentation techniques parameters, such as water ratio, aeration, temperature, pH, ammonia, dissolved oxygen, nutrient substance retention and pathogenic bacteria extinction. A thermophilic aerobic reactor including fermentation tank, heat preservation system, aeration system, churn-dasher and tail gas gathering system was designed and operated. The results showed that the temperature of fowl waste with initial moisture 80% rose to 55 ℃ in 3-4 days and kept for 5 days at the aeration rate of 0.4 m^3·h^-1. The maximum temperature reached 60 ℃ so that the pathogenic bacteria can be killed. During the process, pH remained in neutrality, ammonia output was below 0.1 mg·d^-1, and dissolved oxygen kept around 0.15 mg·d^-1. The technique of aerobic fermentation of solid-liquid mixing livestock waste showed promising as a valuable asset by rendering timely benefits in efficiency, pathogen control and quality of the end product, with significant increasing of plant available nitrogen and phosphorus as well as the pathogen extinction rate after the aerobic fermentation, compared with that of the facultative and anaerobic trails.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第1期339-343,共5页
Journal of Agro-Environment Science
关键词
固液混合态
养殖废物
高温好氧发酵
反应器工艺
solid-liquid mixing
livestock waste
thermophilic aerobic fermentation
reactor technology
