| Althought the water resources in China are rich, the proportion of water per hand is only 1/4 of the word's average because of the large population. With the devolepment of economic and addition of population, the problem of water pollution is getting more and more serious. Up to now in china, National industry and town domestic sewage emission mass annually ascent tendency. National industrial offbent emission satisfaction of standard rate is still lower. Whereas domestic sewage emission mass is immensity and variance, thus concentrating treatment is difficult espically. In some area, political and economical promlems caused by pollution and lacks of water have been the most difficult issue to handle. It is very important and urgent for authorities to reinfore the regulation of water pollution control (WPC) and increase the investment of water pollution treatment.Whereas China is a developing country, sewage water processing expenditures are exiguous and the economic development is off-balance, which aggravate the difficulty for treatment of sewage. It is very necessary to research techinics of high efficiency, inclusive appliance, simple construction and low cost.The foothold paper is to research new techinic of sewage treatment, and do some intendional attempts. On the basis of extensive learning from techinics of the municipal sewage treatment, attempts are made first to explore the technical structure form with high loading capacity for disposing sewage by the short-time effictiveness aeration, and further perfect nitrogen and phosphorus reduction effictiveness. According to the experiment outcome, prolong the duration of the processing materials, thus form a complete disposal technological system. Afterwards difine processing parameters and optimum techinics. Testing result manifestation:Composite process examination: CODcr removal efficiency is good. If sewage inflow concentration is below 500.00mg/L, removal efficiency is 75.00%. If sewage inflow concentration is below 350.00mg/L, removal efficiency is 80.00%. In addition, turbidity removal efficiency is also good, which is above 80.00%. However, TN and TP removal efficiency are poor. Removal efficiency for TN is 65.00%, while removal efficiency for TP is only 40.00%, Thus TN and TP discharge concentration aren't able to meet at the emission standard of sewage. Moreover, because the sewage inflow concentration is high, vermiculite will get impregnated in a short time.Improvement techinics. As indicated in this experiment, sewage outlet concentration of CODcr, TN, TP and turbidity value are able to meet at the emission standard of sewage with a good effect. KMT is used in the aerobic degeradation-anaerbic filtration apparatus to improve the process condition in the aerobic aeration reaction zone. Vermiculite stuffiness do not get impregnated after a long time. It can be known from the analysis that it is advantageous to form a stabilization multiplicate ecological system in the vericulite bed, which can prolong the processing duration of the vermiculit and solve the question of vermiculite regenation.Optimun techinic. On the basis of the combination of theory and practice, new techinic of urban domestic sewage treatment has been worked out, mud and sand are removed first through preliminary sedimentation, lest vermiculite stuffiness is clogged. HRT can be kept at 3h after the sewage is processed through degeradation-anaerbic filtration apparatus, then sewage inflow in the precipitation-crystallization reactor where subsequent phosphorus is removed and HRT will stay 0.5h. All the pocessing time is below 3.5 h. As for processing outcome, the removal of CODcr is 83.00%, TN 75.00%, TP 93.00% and turbidity 86.00%. Treament effictiveness is prefect, SRT is longer, sludge mass is lower, vermiculite stuffiness do well in a long time, thus vermiculite need not be regenerated. With a running cost of 0.31 Yuan/t, this new technic is fit for the treatment of urban domestic sewage.It is quite good for organic loading removed not only in the aerobic degerad... |
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