Abstract
Taking sludge in northwest China’s expressway service area as the research object, four dominant strains, including Bordetella sp. M05, Ochrobactrum sp. M06, Bacillus subtilis M07 and Staphylococcus sciuri M09, were obtained through specific screening. These microbes were prepared into inoculants and effectively promoted sludge composting. The time for the fermentation temperature of the composting process to reach 50°C was 3 days earlier than that of the control group. The high temperature (>50°C) lasted for 12 days and the highest temperature reached 63.5°C. After composting, the product was dark in color, free from odor, and the contents of organic matter, nitrogen, phosphorus and potassium increased by 44.1%, 125.9%, 311.1% and 269.2%, respectively, which made the composted product meet standards of GB/T 23486–2009 Sludge for Landscaping.
Highlights
In China, the expressway service area is an area set up to cater needs of drivers and passengers who are far away from the city for catering, accommodation, maintenance and refueling
The test sludge came from the domestic garbage and sewage treatment system in a high-speed service area in northwest China, manure came from septic tank for toilets, kitchen waste was food residue, and garden waste was dead branches and leaves after cleaning during operation
3.1 Screening of strains 3.1.1 Strain identification After specific screening, four dominant strains were obtained, which were identified as Bordetella sp
Summary
In China, the expressway service area is an area set up to cater needs of drivers and passengers who are far away from the city for catering, accommodation, maintenance and refueling. This area generally consists of a comprehensive service building, toilet, parking lot, maintenance station, sewage treatment room and other facilities. In northwest China, generally, service areas are far away from urban and rural areas, and the cost of transporting sludge and manure to the outside of the service area is high. In the expressway service area in northwest China, besides sewage, it is necessary to further treat sludge and manure generated from sewage treatment. Kitchen waste and garden waste in the service area can be treated together with sludge and manure
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