| Flax is important material of spinning and have certain meaning to increase the income of the planter and developing of the areas which produces flax. However,all kinds of wastes which come into being while flax is cure, especially retting Wastewater give relatively severe pollution to the enviroment. The technology of treating flax retting Wastewater is still explored. If make research about the technology and obtain active advance, the development of flax industry and protecting the enviroment will be promoted.The treatment means to flax retting Wastewater which have been applied was summarized. They mainly include air-flotation/oxidation ditch/stabilization pond process, UASB-MBR process, contact oxidation method and electro-catalytic oxidation, etc. Considering the flax plants' technology situation and productive characteristic and because flax retting Wastewater is organic Wastewater with high concentration, chosed hydrolytic acidification/oxidation process which can resist shock loading well, run steady and is easy to manage and manipulate although occupies land a little more. Bioaugmention was applied to strenthern treatment effect. Microbial Wastewater treatment reagent called Aqua Clean(ACF32) was used as stain in training sludge. Aqua Clean which contains 32 kinds of bacteria including pseudomonad, sulfur purple , bacteria, nitrobacteria, etc., and can be used to treat organic Wastewater with high concentration. It was briefly summarized that bioaugmentation's mechanism in treating wasterwater,using method, advantage and disadvantage, etc.The effective volume of the hydrolytic acidification tank and oxidation ditch respectively was 20L and 53L. The aeration fashion in the oxidation ditch was blast aeration. The Wastewater was drived by pumps and flows in the ditch. The sludge in the the hydrolytic acidification tank and oxidation ditch was trained and acclimatized synchroly. The influent and effluent were intermittent. About 90 days, the sludge in the hydrolytic acidification tank was trained successfully and the MLSS was up to about 20000mg/L. The sludge in the oxidation ditch was trained successfully after about 30 days. The growth situation of the microorganism wasgood. The MLSS was up to about 4000mg/L and the settleability was good.After the sludge was mature, all reactors are connected, the influent andeffluent were continuous. The influent volume was 13L/d. The system ran 20 days altogether. The sludge age of the oxidation ditch was 30d. The aeration volume was 173L/h. Because pH value of the Wastewater used in the experiment was a relatively low,regulate it to around 6.5. The COD of the system's influent was between 6566.8-6925.6mg/L,TN was between 190.1-203.5mg/L,TP was between 14.5-15.3mg/L.At the biginning the effluent was a little fluctuant. After it was gradually steady, the COD of the system's effluent was between 169.1-289.6mg/L , and meetthe requirement set by Class II National Standard in GB8978-1996. The elimination ratio to COD of the hydrolytic acidification tank averaged to 57.0%,and the elimination ratio of the system keep above 90%. The TN's average of the system's effluent was 24.3mg/L. The elimination ratio to TN of the hydrolytic acidification tank and oxidation ditch resepectively averaged to 19.6% and 84.7%. The hydrolytic acidification tank hasn't eliminate TP. Average TP of the system's effluent was 3.5 mg/L.Althoug it wasn't congruous with the corresponding standard, relatively high elimination ratio which averaged to 83.2% was still obtained. The colority of the system's influent and effluent was respectively between 790-860 and 120-290. The pH value of the system's influent and effluent was respectively between 5.23-5.97.The computed yield coefficient was 0.6824kgVSS/kgCOD and the decay coefficient was 0.0467d-1. |
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