ozone wastewater Articles
-
Suitability of ozone pre-treatment for amoxicillin wastewater
This study deals with the ozonation of amoxicillin in real pharmaceutical wastewater and its efficacy as a pre-treatment, prior to biological degradation by a mixed culture of bacteria in a sequencing batch reactor (SBR). An ozone utilization of 0.27 g/g-COD (chemical oxygen demand) lowered the pH of the wastewater to 6.6, reduced the specific ultraviolet absorption by 43% and increased ...
-
Decreased UV absorbance as an indicator of micropollutant removal efficiency in wastewater treated with ozone
Ozone transforms various organic compounds that absorb light within the UV and visible spectra. UV absorbance can therefore be used to detect the transformation of chemicals during ozonation. In wastewater, decolourisation can be observed after ozonation. This study investigates the correlation of the UV absorbance difference between the ozonation inlet and outlet and the removal efficiency of ...
-
Oxidation of nitrobenzene by ozone in the presence of faujasite zeolite in a continuous flow gas–liquid–solid reactor
This work investigates the oxidation of nitrobenzene (NB) by ozone in the presence of faujasite zeolite. Experiments were carried out in a gas–liquid–solid reactor were ozone transfer and NB oxidation took place at the same time. Three configurations of the reactor were compared: empty, filled with inert glass beads and filled with faujasite pellets. First, ozone transfer coefficient (kLa) and ...
-
An advanced oxidation process using ionized gas for wastewater treatment
This study on removing non-degradable materials in wastewater focused primarily on advanced oxidation methods such as ozone, ozone/UV and ozone/H2O2. Wastewater treatment using an ionized gas from plasma has been actively progressing. The ionized gas involves reactive species such as O2+, O2− cluster, O radical and OH radical. Since the ionized gas method has such outstanding characteristics as ...
-
Can treated municipal wastewater be reused after ozonation and nanofiltration? Results from a pilot study of pharmaceutical removal in Henriksdal WWTP, Sweden
The objective of this study was to evaluate the potential of nanofiltration (NF) and ozonation for indirect potable reuse in terms of pharmaceutical residuals. To simultaneously obtain a reasonable retentate volume for further treatment, the tests were performed at a high volume reduction factor (VRF) of 60. The feed to the pilot plant was the effluent from a BNR plant with a final process step ...
-
Aerospace Treatability
The facility uses this Zyglo penetrant for examination of their aerospace components that they manufacturer. The company pre-ozonates their wastewater before a reverse osmosis unit and the entrained oils required back flushing of the membranes every 1,000 gallons. They are looking at a solution to clarify the water and remove the oil before the membranes. The wastewater received was at a pH of ...
-
Ozonation of estrogenic chemicals in biologically treated sewage
The present study shows that ozonation of effluents from municipal wastewater treatment plants (WWTPs) is likely to be a future treatment solution to remove estrogens and xeno-estrogens. The required ozone dose and electrical energy for producing the ozone were determined in two WWTP effluents for removal of 17 estrogenic chemicals. The estrogenic compounds included parabens, industrial phenols, ...
-
Diesel Manufacturer
The wastewater received was at a pH of 13.5+/- from the alkaline cleaners used in their cleaning process. Using carbon dioxide (gas, which forms carbonic acid in water), the pH was lowered to 7.5 after bubbling with a gas diffuser block for 4 hours (the wastewater was highly buffered). The wastewater was then ozonated for 24 hours and jartested using 0.283 grams of Floccin G in a 100 ml jar ...
-
Ozone disinfection: main parameters for process design in wastewater treatment and reuse
Wastewater disinfection by ozone was investigated at pilot and full scale on different wastewater effluents and two types of ozone reactors. It was demonstrated that water quality and, in particular, suspended solids and organic content strongly influence the required ozone dose for a given level of disinfection. The increase in contact time and residual ozone concentration did not improve the ...
-
Membrane filtration and sonication for industrial wastewater reuse
This paper presents an experimental study aimed at estimating the efficiency of the innovative process of ultrafiltration (UF) combined with sonication (Son.) for the refinement of treated effluent to be reused in wet textile processes. Such a novel approach, which has not yet been employed on a full industrial scale, has been experienced at pilot scale on the secondary effluent of the ...
-
Efficiency, costs and benefits of AOPs for removal of pharmaceuticals from the water cycle
Different advanced oxidation processes (AOP) were developed for the treatment of highly loaded wastewater streams. Optimisation of removal and improvement of efficiency were carried out on a laboratory, semiworks and pilot plant scale. The persistent cytostatic drug cyclophosphamide was selected as a reference substance regarding elimination and evaluation of the various oxidation processes ...
-
What is the advantage of ozonator in sewage?
Ozone disinfection overcomes the danger of other methods in the process of transportation, storage and treatment. Ozone disinfection has a short contact time, can improve water quality, and is a good disinfectant. Ozone can kill viruses and spores that cannot be killed by other methods such as chlorine. Ozone disinfection is not affected by ammonia hydrogen content and pH value in wastewater. ...
-
Long-term effects of the ozonation of the sludge recycling stream on excess sludge reduction and biomass activity at full-scale
This paper presents a full-scale experience of sludge minimization by means of short contact time ozonation in a wastewater treatment plant (WWTP) mainly fed on textile wastewater. The WWTP performance over a 3-year operational data series was analysed and compared with a two-year operation with sludge ozonation. Lab-scale respirometric tests were also performed to characterize biomass activity ...
-
Removal of pharmaceuticals with ozone at 10 Swedish wastewater treatment plants
Pilot-scale tests were run with ozonation for reduction of 24 pharmaceuticals at 10 full-scale wastewater treatment plants in southern Sweden. Reduction was evaluated based on doses of 3, 5 and 7 g O3/m3 at all plants. The reduction of pharmaceuticals reached on average 65% at 3 g O3/m3, 78% at 5 g O3/m3 and 88% for 7 g O3/m3 in terms of total concentration of pharmaceuticals. Specific ozone ...
-
Pilot Plant Investigation of Ozone Disinfection of Physicochemically Treated Municipal Wastewater
Wastewater Treatment Plant (MUCWTP) to assess the feasibility of employing a full scale ozone disinfection system.Wastewater characteristics such as turbidity, COD, TOC, BOD, pH, ORP and suspended solids were monitored to assess their effect on ozone disinfection. Fecal conforms (FC) were used as indicators to measure disinfection performance. Ozone disinfection was capable of reducing the fecal ...
-
Applications of ozone for modern wastewater treatment
Modern Wastewater Treatment Plants (WWTPs) efficiently eliminate organic pollution down to Biological Oxygen Demand (BOD) and Suspended Solids (SS) values of less than 30 mg/l. However, these treated effluents still contain biologically Persistent Organic Matter (POM), characterised by a Chemical Oxygen Demand (COD) of between 50 and more than 100 mg/l. Industrial WWTP effluents have COD ...
-
Upgrading of an activated sludge wastewater treatment plant by adding a moving bed biofilm reactor as pre-treatment and ozonation followed by biofiltration for enhanced COD reduction: design and operation experience
A paper mill producing 500,000 ton of graphic paper annually has an onsite wastewater treatment plant that treats 7,240,000 m3 of wastewater per year, mechanically first, then biologically and at last by ozonation. Increased paper production capacity led to higher COD load in the mill effluent while production of higher proportions of brighter products gave worse biodegradability. Therefore the ...
-
Impact of ozonation in removing organic micro-pollutants in primary and secondary municipal wastewater: effect of process parameters
The study investigates the influence of process parameters on the effectiveness of ozonation in the removal of organic micro-pollutants from wastewater. Primary and secondary municipal wastewater containing phenol was treated. The effect of operating parameters such as initial pH, ozone dosage, and initial contaminant concentration was studied. An increase in contaminant decomposition with pH ...
-
Pesticide removal through wastewater and advanced treatment: full-scale sampling and bench-scale testing
Dieldrin and DDx removal through wastewater treatment, ozonation, and microfiltration was assessed for a water reuse project for groundwater replenishment in Monterey, California, USA. Full-scale sampling was conducted at the wastewater treatment plant, and physical wastewater treatment processes, ozonation, and microfiltration were tested at the bench scale. Removals observed through ...
-
Mitigating Environmental Impact Of Gold Mine Wastewater Through Ozone Oxidation And Aquifer Re-injection
US Environment Protection Agency (USEPA) regulations require mining operations to remediate their waste streams prior to environmental discharge. Wastewater streams from gold mine operations can be particularly toxic due to the potential for cyanide contamination and the concentration of metals contained in the wastewater effluent. This paper reviews the challenges and success of installing and ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you