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2 edition of Effect of pretreatment on the filtration of low turbidity secondary effluent found in the catalog.

Effect of pretreatment on the filtration of low turbidity secondary effluent

Leon S. Directo

Effect of pretreatment on the filtration of low turbidity secondary effluent

by Leon S. Directo

  • 38 Want to read
  • 14 Currently reading

Published by Environmental Protection Agency, Office of Research and Development, Municipal Environmental Research Laboratory, for sale by the National Technical Information Service in Cincinnati, Ohio, Springfield, Va .
Written in English

    Subjects:
  • Coagulation,
  • Filters and filtration,
  • Sewage disposal -- United States

  • Edition Notes

    Statementby Leon S. Directo, Ching-lin Chen, Robert P. Miele
    SeriesEnvironmental protection technology series ; EPA-600/2-80-148
    ContributionsChen, Ching-lin, joint author, Miele, Robert P., joint author, Municipal Environmental Research Laboratory, Los Angeles County (Calif.). County Sanitation Districts
    The Physical Object
    Paginationix, 75 p. :
    Number of Pages75
    ID Numbers
    Open LibraryOL13603518M

    - Its applications include direct filtration of low turbidity water or filtration of coagulated water for high turbidity water. - In this study, floating media filtration system coupled with coarse sand filter/ zeolite bed/ microfiltration membrane was applied to the treatment of surface water and secondary effluent. The relatively poor effluent produced limits this design to facilities which need only pretreatment before discharge to a municipal system. The advantage of high rate aeration is low capital investment (i.e., smaller tanks and basins due to the short oxidation time).

    Effluent treatment 25 Process wastewater pretreatment 25 Desalter effluent treatment 25 Wastewater segregation 27 Primary treatment 28 First stage: separation (oil/water separators, API separators) 28 Secondary oil/water separation 29 Equalization system 30 Location of the equalization system 31 Secondary treatment 31 Suspended growth processes   The filter pretreated with Al (OH) 3 (am) achieved better than % removal of an untreated clay suspension, with a filter effluent turbidity below the detection limit of NTU. Al (OH) 3 (am) -pretreated filters that were challenged with clay and humic acid achieved ≥ % turbidity removal efficiency for 14 h of operation in the.

    Membrane microfiltration produced a permeate of similar or better quality than that produced by conventional filtration. Good removal of particulate contaminants, including coliform bacteria, was observed. In this regard, the process appears to be as effective as chlorination for the removal of coliforms from secondary waste effluent.   A pilot scale micro-flocculation and dynasand filtration process was used to pretreat the petrochemical secondary effluent. The suspended solids (SS) and the dissolved organic matter (DOM) removal characteristics were investigated. The results showed that the optimized poly aluminum ferric chloride (PFAC) dosage was 10 mg/L during the experiment.


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Effect of pretreatment on the filtration of low turbidity secondary effluent by Leon S. Directo Download PDF EPUB FB2

Dual media filter. The study demonstrated that for a low turbidity secondary effluent, an in-line coagulation pretreatment is feasible and results in significantly lower overall capital and operating costs than that of a conventional chemi- cal coagulation-sedimentation pretreatment system.

Moreover, it. Get this from a library. Effect of pretreatment on the filtration of low turbidity secondary effluent. [Leon S Directo; Ching-lin Chen; Robert P Miele; Municipal Environmental Research Laboratory.]. In this study, membrane filtration was used to treat a secondary effluent from a biological wastewater treatment plant that receives significant amount of industrial wastewater in the influent.

The investigation was focused on the selection of pretreatment technologies for the RO by: Figure 4 represents the ferrous removal by activated carbon filter that followed the Turbidity without PAC Turbidity with PAC ooids filter in the presence of mg Al/l of PAC at 20 l/ min and at.

Steady flux was increased from 24 L/m h for wastewater without pretreatment to L/m h with pretreatment. COD was also eliminated after CFS/NF, and turbidity was reduced to NTU.

The secondary effluent showed the TOC of mg/L, TDS of μS/cm, UV of cm −1, and turbidity of NTU, respectively. The tertiary effluent had lower turbidity ( NTU) and TOC ( mg/L) values.

Fig. 2 shows turbidity of the secondary effluent (input water) and the clarified water, together with the pH values of the clarified water during the experiment. With respect to pH, two distinct stages can be observed. The first with pH fairly stable at up to with turbidity of the clarified water exceeding that of the secondary effluent; the second, with pH gradually increasing.

In other studies about GAC filtration of secondary effluents similar results were obtained. Kim et al. studied different pretreatments for RO. Dual-media filtration followed by GAC filtration of the secondary effluent was tested and the results showed a turbidity reduction of 70%, a COD removal of 75–85% and a TOC removal of 70–75%.

The aim of this work was to show the effect of change in pH on removing turbidity, the concentra- tion of turbidity (, ) NTU, where the turbidity was removed by using activated carbon col- umn (height 11 cm and internal diameter 8 cm) and contained a cotton filter in the bottom of it, pH.

The maximum level of turbidity of the CFE must not exceed 1 NTU for membrane filtration and 5 NTU for B/C filtration. The frequency of CFE turbidity monitoring depends on the system size and type of filtration: All Systems Turbidity must be monitored on representative samples of the CFE every 4 hours that the system serves water to the public.

Ultrafiltration alone can remove only a portion of the effluent organic matter (EfOM) from biologically treated sewage effluent (BTSE). Use of pretreatment not only improves the EfOM removal but also reduces the membrane fouling.

In this research, NTR ultrafiltration membrane was employed to remove EfOM from BTSE. The aim of this work was to show the effect of change in pH on removing turbidity, the concentration of turbidity (, ) NTU, where the turbidity was removed by using activated carbon column (height 11 cm and internal diameter 8 cm) and contained a cotton filter in the bottom of it, pH range (5, 7, 10), by using pH adjustment (HCL, NaOH), alum and ferric chloride was used as additive.

Fouling in the low-pressure membrane filtration of secondary effluent for water reuse can be severe due to the complex nature of the components in the water.

evaluated on a low-turbidity, low. In the above domain, the BOD 5, TOC, turbidity, total-P, and the orthophosphate levels of the secondary effluent were reduced by 73%, 57%, 98% and 99% respectively after tertiary filtration.

The effluent of Ghods Treatment Plant was selected as the influent for the both pilots and a turbidity of 2NTU for the filter effluent has been specified as the breakthrough. have any turbidity higher than Nephelometric Turbidity Units (NTUs).

In direct filtration, no clarification follows the coagulation phase. Direct filtration is designed to filter water with an average turbidity of less than 25 NTU. Dual and multi-media filters are used with direct filtration. Effect of coagulation pretreatment on membrane filtration performance.

Journal - American Water Works Association98 (4), DOI: /jtbx. Kevin Young-june Choi, Brian A. Dempsey. In-line coagulation with low-pressure membrane filtration.

Low-pressure membrane fouling mechanisms are not only a function of membrane type (MF or UF) Citation:\rNguyen, T, Fan, L, Harris, J and Roddick, F'Identification of key water quality characteristics\raffecting the filterability of biologically treated effluent in low-pressure membrane filtration',\rWater Science and Technology, vol.

62, n\. Coagulation and the Fenton process were applied individually by Xu, Li, and Hou as a pretreatment step before ultrafiltration (UF) for the treatment of secondary effluent from a recycled paper mill. Results exhibited that Fenton pretreatment combined with UF had the best performance and resulted in a COD rejection of %.

Some supported the effectiveness of coagulation pretreatment, while others contended that coagulation aggravated membrane performance.

This research aims to identify the effects of coagulation pretreatment on membrane filtration through a pilot study using PVDF membrane in combination with analyzing the rationale of coagulation.

primary / secondary wastewater treatment system aeration basin mixed liquor final or 2’ effluent waste activated sludge (was) return activated sludge (ras) waste water primary sludge sludge digester or holding tank 1’ eff liquid phase filtrate, centrate, pressate sludge cake primary clarifier secondary clarifier sludge dewatering.Using coagulation and sedimentation process in the advanced treatment of urban secondary effluent which can be recycled to circulating cooling water system in power plant is only perform well on CODCr and turbidity removal.

But the concentrations of organic matter and NH3 in effluent can not meet the requirements of circulating cooling water.In primary effluent filtration (PEF), physical filtration is used to treat primary effluent to reduce TSS, BOD, or other contaminants without using secondary treatment in trickling filters or activated sludge processes.

Filtration is a relatively low cost form of treatment; if PEF can meet the effluent .