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The application of the reverse osmosis (RO) and nano-filtration (NF) membranes in the ammonia nitrogen separation of paraquat wastewater was studied. The parameters of membrane flux, operating pressure, concentration and pH, and temperature etc, which affect membrane separation performance were investigated. The results showed that the rejection rate of the ammonia nitrogen were 37% and 65%, the removal...
The paper reviews the research progress in sludge dewaterability by thermal conditioning and analyzes the fundamental mechanisms of sludge dewaterability. The main factors affecting sludge dewaterability by thermal conditioning are experimentally investigated. The results show that the major factors for improving sludge dewaterability by thermal conditioning are conditioning temperature and residence...
Performances of a slow sand filter used in tertiary treatment of domestic wastewater were evaluated by a lab scale test. Influent and effluent COD, turbidity, color and total bacterial counts were analyzed for more than one year. All results showed that, performances of the slow sand filter were nearly the same with its filtration rate 0.3 m/h or 0.1 m/h., but decreased dramatically when its filtration...
Supercritical(sub-critical) water oxidation technology is applied to degrade the explosive wastewater and low its chemical oxygen demand (COD). The technology optimum and reaction dynamics of TNT, RDX, HMX degradation have been investigated. The experiment results show that the optimum degradation technology is: reaction temperature T=648K, reaction time t=5min, the volume proportion of waste water...
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