The Urban Biological Waste Anaerobic Digestion Starting Experiment And Schematic Design

The production of urban biological waste in our country is very big, and its moisturecontent is high. It has brought many challenges to the traditional disposal ways such aslandfill, incineration. How to treat the urban biological waste and at the same time, producebiomass energy, have always been a focus in research of solid waste. Because of dryanaerobic fermentation has advantages such as high gas production rate, low wastewateryield and so on, it has being researched extensively. But there are still many bottlenecks onthe promotion, such as sealing, material mixing, acid suppression and so on.In this paper, on the basis of the experience at home and abroad, a set of garage-typedry anaerobic digestion system was preliminarily designed. At the same time, as the twosets of pilot devices for equipment, using urban biological waste as raw materials and asanaerobic sludge and pig manure for inoculum, a start-up experiment was carried out, themain conclusions are as follows:(1) In the start-up experiment, add large amounts of inoculum is crucial to alleviateacid suppression and shorten the start-up time, but it’s amount shouldn’t be too large,generally20%to30%is advisable. The best inoculum is the domesticated anaerobicsludge and feces of livestock and poultry.(2) Joining the anaerobic sludge and pig manure as inoculum is better than onlyjoining anaerobic sludge, it’s beneficial to regulating C/N of system and relieving acidinhibition effectively.(3) The effect of using the spraying of the aged landfill leachate to adjust the pH, soas to improve the effect of total gas production and gas rate is obviously.(4) In the design of dry anaerobic digestion garage system, the difficulties are thesealing, temperature problem, mixing system and so on. How to design an efficient mixingsystem and alleviate acid suppression, and then yield gas stably and rapidly are the keyproblems to be solved in the design of garage devices.