wastewater treatment technology in the cyclic nature of the process that takes a long time. but man tries to rush to their needs with experience and understanding of the natural processes of interaction, and using technology to build their industrial development is authorized. sewage treatment reed have been born from the vision of man's increasing need to water daily decreases the natural reso...

environmental contamination by toxic metals is a serious problem due to their extreme toxicity towards aquatic life and humans. biosorption is an alternative technology to conventional processes for the removal of metals. biosorption of pb(ii) ions on the lichen biomass of cladonia rangiformis hoffm. is presented in this research. batch experiments were conducted to study the biosorption proper...

the efficiency of existing municipal wastewater treatment plants has been affected by the increase of incoming organic load caused by the expansions in developing countries. in the present investigation, the effect of chemically enhanced primary treatment (cept) process was studied on the enhancement efficiency of a municipal wastewater treatment plant in tehran, iran. jar test results showed a...

nano-srtio3 and tio2 powders were synthesized using sol-gel method. the srtio3 and tio2 powders were characterized using xrd, sem, and spectrophotometry. xrd analysis indicated that the tio2 powder was uniform anatase crystals of 9.9 nm and the srtio3 powders was cubic nano-crystal of 16.2nm. photocatalytic experiments revealed that methyl orange in water can be decomposed on the two powders un...

in the present study seven synthetic polymers were used as adsorbents for the removal of cd(ii) from aqueous solution. the equilibrium studies were systematically carried out in a batch process, covering various process parameters that include agitation time, adsorbent dosage, and ph of the aqueous solution. the analyzing system was an atomic absorption spectrometer (perkin-analyst 100). it was...

an efficiency-centred hierarchical model is developed to assess the performance ofwastewater treatment plants (wwtps). specifically, a new treatment performance index (tpi) hasbeen proposed to determine the overall treatment performance of wwtp by analysing the tpivalues and the weights of individual treatment phase for overall treatment performance. threemodules have been developed to examine ...

in this study, activated sludge process for wastewater treatment in a refinery was investigated. for such purpose, a laboratory scale rig was built. the effect of several parameters such as temperature, residence time, effect of leca (filling-in percentage of the reactor by leca) and uv radiation on cod removal efficiency were experimentally examined. maximum cod removal efficiency was obtained...

1. Water Management Systems: A Brief History 1.1 Greco-Roman Influence on Water Management 1.2 Water Supply and the Industrial Revolution 1.3 Water Engineering in the 20 Century 2. Conventional Sewage Treatment Techniques 3. Third Generation Wastewater Treatment Systems 3.1 Facultative Ponds 3.2 Constructed Wetlands 3.2.1 Limiting Factors of Wetland Processes 4. Reassessing the Conventional Sys...

The chemical composition of pectin production wastewater and its toxicity during biological treatment were investigated. Samples of wastewater from different steps of a pectin production wastewater biological treatment plant were investigated including the influent of the treatment (1), after denitrification tank (2), after anaerobic treatment (3) and final effluent (4). The conventional physic...

Dissolved organic nitrogen (DON) derived from wastewater effluent can participate in reactions that lead to formation of nitrogenous chlorination by-products, membrane fouling, eutrophication, and nitrification issues, so management of DON is important for both wastewater reuse applications and nutrient-sensitive watersheds that receive discharges from treated wastewater. This study documents D...