| Serious devoid of water resource and deteriorated water environment have been popular concerned problem at present. The reuse of the municipal wastewater is an important measure to solve the scanty water resource. Hence the technology of treatment of municipal wastewater has much significance to most cities in China. The article proposed adopting the combined technology of Diatomite and Biostyr for municipal wastewater reclamation. The objective of this test was to determine the optimal operation status and parameters and offer references for project design by detecting the water quality indexes such as CODcr, NH4+-N, SS and optimizing the main operation parameters.Experimental results showed the following regular patterns:1.The best parameters of diatomite used in coagulating experimental to municipal wastewater are as following: diatomite dosage was 100mg/L. Experimental results showed that, under the best parameters, the adsorb ratios of CODcr, NH4+-N, SS are 34.7%, 29.9% and 56.2%.2.From the experimental of diatomite ,we can conclude that when it used in pretreatment process it can remove SS efficiently which will create a better condition for later treatment.3.In lab-scale experiment, the performance of Biostyr is studied. The main objects studied here are the disposal efficiencies of COD, NH4+-N, SS and other factors which can influence the efficiency. The factors that can influence the performanceof Biostyr are: the ratio of gas to liquid, hydraulic load and organic load. At the current characteristic condition of water, optimum operating parameters are shown as follows: hydraulic load is 1.5m3/ (m2·h) , ratio of gas to liquid is 3:1, back-flush frequency is 1～2days. In order to ensure the removal efficiency with CODcr, NH4+-N were more than 84%, 92%,the corresponding best CODcr load is 4.73～5.17 kg/(m3·d), the most NH4+-N load that reactor can bear is 0. 87 kg/(m3·d)4.The experiment reaches a conclusion that: when hydraulic load is constant, COD of effluent will increase as the organic load rises, but remove efficiency is steady, this shows that Biostyr has a best ability to resist the great change of organic load.5.In the fields of technology and economic, if using Biostyr process to treat domestic sewage, it can be concluded that it has advantages such as low one-off investment, low operation cost. high annual economic benefit, etc. So Biostyr has good technic and economic effect.6.It was feasible for municipal wastewater reclamation by Diatomite and Biostyr technology and the effluent completely complied with the recycle requirements. The effluent of diatomite and Biostyr technology excelled living water quality standard. |
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