Abstract
Aerobic fermentation treatment technology is one of the effective means of kitchen waste resource treatment at present. Due to the high moisture content of kitchen waste, dehydration pretreatment is needed before aerobic composting.At present, China usually adopts mechanical methods such as forced extrusion for dehydration treatment, which not only has high energy consumption, but also has high content of solid suspended solids (SS) and chemical oxygen demand (COD) in sewage. Sewage is difficult to meet discharge standards.In this paper, biological dehydration technology is proposed to pretreat kitchen waste. Experiments show that biological dehydration pretreatment can dehydrate kitchen waste, effectively reduce the SS and COD values in sewage, which is of great significance to the resource treatment of kitchen waste.
Highlights
On July 1, 2019, Shanghai took the lead in implementing the "Shanghai Municipal Household Waste Management Regulations" to classify and treat household waste in four ways
Microorganism (A) and biological dehydration treatment time (B) were selected as the influencing factors, and the moisture content of kitchen waste ( i ), PH value of kitchen waste ( ii ), solid suspended solids SS (iii) and chemical oxygen demand (COD) (iv) of sewage were used as the investigation indexes
SS and COD were measured in sewage samples at 1h, 3h, 6h, 8h, 10h and 12h after material input.The moisture content of kitchen waste is dried and measured by hX101-00BA4 electric thermostatic drying oven of Itong Century Technology Company; the PH value of kitchen waste is measured by Xima PH 848 test pen; the SS and COD values of experimental sewage samples are measured by Shanghai Kai Lin Environmental Protection Technology Co., LTD
Summary
On July 1, 2019, Shanghai took the lead in implementing the "Shanghai Municipal Household Waste Management Regulations" to classify and treat household waste in four ways. Kitchen waste is rich in organic substances and has the characteristics of perishability, high water content and high organic content. After proper treatment, it can be transformed into new resources [1]. Aerobic fermentation treatment technology is one of the effective means of kitchen waste resource treatment at present. Mechanical methods such as gravity, centrifugal force and forced extrusion are usually used for dehydration treatment in China, which has high energy consumption, and high content of solid suspended solids (SS) and chemical oxygen demand (COD) in sewage, making it difficult to meet the sewage discharge standards [2, 3]. At the same time,Microbes generate a lot of heat in the process of metabolism, which helps dehydrate kitchen waste[4, 5]
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