In order to reduce and deal with domestic sewage from the source, Eco-Symbiotic system (ESS) was built to investigate the biological symbiosis, output of biological organisms and purification of sewage under natural c...
In order to reduce and deal with domestic sewage from the source, Eco-Symbiotic system (ESS) was built to investigate the biological symbiosis, output of biological organisms and purification of sewage under natural condition. The results showed that the ESS provided good growth for biological symbiosis. Three generation larvae were bred by three guppy couples, and water spinach were harvested 6 times with a total of 4304g in the test period. The ESS has strong buffering capacity, for the stable pH value (7.35-7.75), and the high removal rate of total phosphorus (TP, 89.2%) and total nitrogen (TN, 71.3%). The effluent can reach A level of Urban Sewage Treatment Plant Pollutant Discharge Standards (GB18918-2002). The ESS is a type of treatment to reduce sewage emissions from where the pollution started, improving the utilization of water resources, so it has broader application prospects.
Rapid COD determination method using spectrophotometry with high-temperature-pressure digestion（SHTP） was designed because COD determination by classic potassium dichromate reflux method（CFM, GB/T 11914-89） had so...
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Rapid COD determination method using spectrophotometry with high-temperature-pressure digestion（SHTP） was designed because COD determination by classic potassium dichromate reflux method（CFM, GB/T 11914-89） had some drawbacks, such unable to analysis in batches, high cost, while had some adverse effect on the environment. SHTP was applied to the study the wastewater quality change of constructed welands for domestic sewage treatment. The results showed that there was a positive correlation between CFM and SHTP（r=0.8801）. The linear regression equation between the two methods was COD=1.2198 COD-4.5745, and the significant test shows no significant difference between the two methods（P=0.07>0.05）. Therefore,the study provided a new and fast method to batch monitoring COD of the sewage water purified.
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