Research On The Trial And Energy Consumption Of "ABR+BPBC" Treating Domestic Wastewater

Aerobic processes are almost employed by all wastewater treatment plants in china, but they have several disadvantages such as high energy consumption , much excess sludge, many buildings, large cost. Due to these disadvantages, environment scientists have been exploring a low cost and high efficient substitutable process, although in recent years several processes, such as AB, A²O, SBR and BAF, have been applied, they don't completely solve the problem of the highest energy consumption in blasting, in contrast centered anaerobic wastewater treatment process can solve the problem thoroughly.Domestic wastewater treated by efficient ABR has high concentration ammonia, and BPBC was applied to oxide ammonia. Through the research and evaluation of energy consumption, conclusion can be made that the process economically success to treat domestic wastewater or not. Some conclusions were showed as following:1. ABR treating domestic wastewater can achieve very good effect, when HRT equal to or is more than 5h, the average COD removal rate amount to about 85%.2. When HRT is between 16 to 5h, the production rate of methane is between0.301 -0.169 LCH₄/gCOD_remove.3. The alkalinity in domestic wastewater is sufficient, which can meet the need of anaerobic treatment process.4. Anaerobic treatment can produce large amount of methane, which produce huge economic benefit that 0.0823⁰.147kw.h is reclaimed when 1m³ wastewater is treated through ABR process.5. BPBC as post-treatment of ABR consume lots of energy so as to it can counteract the advantage of energy conservation of anaerobic process. When 5g/L sodium chloride was added to wastewater and electrical current is 2A, general net energy consumption is 46.8kw·h/kgNH₄⁺-N (0.864 kw·h/m³wastewater) .