The Technology Of Wastewater Treatment And Water Reuse In Buildings

Nowadays, the tension between water resource supplement and demand has becomemore and more sever. It has become vital that our research for water resources for our societymust find solutions for this problem. A solution that reclaims water reuse, not only can solvethe water shortage problem, but can also become a good economic and environmental benefit.However, because of the large project investment and land occupation, how to improve thetreatment and reuse processes of waste water in green buildings has been being an attractiveresearch topic for a long time.First of all, the research in this article uses integrated A/O biological contact aerobicpond method to treat and analysis the domestic waste water resource from an advancedmiddle school. When the system is running under the best technological conditions, whichincluding air inflow rate0.125m3/h (air water ration25:1), system retention time13h, BODloading rate0.554kg/m3·d, inflow pH value equal to8, is when we need to analyze thechange of COD, Ammonia-Nitrogen, total nitrogen, and pH value. After treatment has beendone by this testing facility, the effluent COD removal efficiency can reach90%, the effluentCOD concentration can be lower than10mg/L; the effluent total nitrogen overall removalefficiency would between30%~60%, concentration would between15mg/L~25mg/L, andthe variation range of pH value is small.Furthermore, this research chooses a technological process which is water regulation;anaerobic pond; aerobic pond; BAF pond; clean water basin; accurate filtration; ultravioletlight disinfection and storage as the waste water treatment process for this advanced middleschool. Through the calculation, this article accomplishes the design of the waste watertreatment technological infrastructure and the economic analysis. The the operation costwould be￥0.36/ton water. After actual running and monitoring the water quality, effluentpH value is7.46(6~9); turbidity is2.7NTU (≤5mg/L); ammonia-nitrogen is1.29mg/L(≤10mg/L). All these levels would meet the domestic miscellaneous standard which indicatesthat this technological process produce good results on waste water treatment.Finally, through the calculation of reclaimed water flow rate and water flow rate balance,this article also completes the reclaimed water reuse technology design. The resource ofreclaimed water is treated waste water from treatment infrastructure as noted above, and thesupplemental water resource is the collection of rain water from the roof of buildings. Thereclaimed water source would function as restroom and irrigation water. The restroom waterwill utilize the water pump-water storage technique. In conclusion, the waste water treatment cost of this research is0.36/ton. Compared tothe present tap-water price in Guangzhou, which is at￥2.53/ton, reusing reclaimed watercould provide an impressive long term economic benefit.