Effects of waste filter backwash recycle operation on clarification and filtration

Tobiason, John E.; Edzwald, James K.; Gilani, Vivek; Kaminski, Gary S.; Dunn, Howard J.; Galant, Peter B.

doi:10.2166/aqua.2003.0025

Cited by 10 publications

(11 citation statements)

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“…The average values of total phosphorus in the tested washings did not exceed 2 mg P/dm 3 with the exception of washings discharged from B14 and B16 in which case the average values of total phosphorus amounted to, respectively, 2.03 mg P/dm 3 and 2.30 mg P/dm 3 (Fig. 6).…”

Section: Analysis Of Research Resultsmentioning

confidence: 92%

“…With the exception of washings discharged from B9, B14, B20 and B25, the amount of total nitrogen in washings did not exceed the limit for sewage discharged to water and soil, ie 15 mg N/dm 3 (Fig. 7).…”

Section: Analysis Of Research Resultsmentioning

confidence: 95%

“…Due to the fact that the beds are rinsed during evening hours, the next determination of free chlorine in the washings samples was done after 12 hours. The reduction of free chlorine ranged from 37.9% in B3 to 94.7% in B2, and the content of chlorine in the washings samples ranged from 0.02 to 3 . In the case of washings from B3, B10, B15 and B22, the content of free chlorine was determined after 2 hours and amounted to, respectively: 0.18; 0.15; 0.12 and 0.18 mg Cl 2 /dm 3 (Fig.…”

Section: Analysis Of Research Resultsmentioning

confidence: 97%

“…Technologies for recovering water from washings discharged from water treatment stations have been used in Poland and all over the world for many years [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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The Study of Possibilities for Reuse of Washings from Swimming Pool Circulation Systems

Wyczarska-Kokot

2016

Ecological Chemistry and Engineering S

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Swimming pools are very expensive, in terms of operation, sports facilities. Therefore, investors and managers of these facilities are looking for methods of reducing the costs of their use. One of the proposed methods is the managing of washings previously discharged to the sanitary sewage system. The assessment of possibilities for reuse of washings from swimming pool filtration system is based on the limits of basic indicators of pollutants in wastewater discharged to water and soil (temperature, pH, TSS, BOD5, COD, TN, TP, free chlorine). The conducted research of washings quality from 26 tested swimming pools have shown that washings quality is dependent on the operating conditions of the pool circuit, including the filter cycle duration and types of filter bed. A direct discharge to water or soil may be impossible due to excessive amounts of total suspended solids (above 35 mg/dm 3 ) and free chlorine concentration (above 0.2 mg Cl2/dm 3 ). However, the quality of supernatant water of washings subjected to sedimentation in the laboratory shows that the washings are suitable for reuse. The installation of settling tanks in swimming pool facilities could relieve the sewage systems and allow for the discharge of supernatant water to surface waters or for the irrigation of green areas in an environmentally friendly way.

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Section: Analysis Of Research Resultsmentioning

confidence: 92%

Section: Analysis Of Research Resultsmentioning

confidence: 95%

Section: Analysis Of Research Resultsmentioning

confidence: 97%

“…Technologies for recovering water from washings discharged from water treatment stations have been used in Poland and all over the world for many years [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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The Study of Possibilities for Reuse of Washings from Swimming Pool Circulation Systems

Wyczarska-Kokot

2016

Ecological Chemistry and Engineering S

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“…Thus, recycling drinking water treatment (DWT) sludge was proposed as a novel method to optimize the traditional treatment technology as expected for the improvement of the flocculation efficiency for low-turbidity water. Edzwald et al [3,4] investigated the effect of directly recycling the filter backwash water (FBW) on different treatment units and found that the recycling of FBW was not in proportion to the large increase in the clarifier influent solids. Qi et al [5] found that upon the reuse of poly aluminium chloride and alum sludge to treat natural surface water prior to ultrafiltration process, the removal efficiency of turbidity could increase to 80.2% than that of the conventional process.…”

Section: Introductionmentioning

confidence: 99%

The impact of recycling sludge on water quality in coagulation for treating low-turbidity source water

Chen

Ya-tong

Wang

et al. 2015

Desalination and Water Treatment

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2015): The impact of recycling sludge on water quality in coagulation for treating low-turbidity source water, Desalination and Water Treatment, There is an alternative method for the treatment of low-turbidity source water that reuses coagulation sludge as low-turbidity raw water to enhance conventional coagulation efficiency. This research investigated the impact of the recycling ration by volume of coagulation sludge on enhancing the removal efficiency of specific water quality parameters in a pilot-scale experiment with a capacity of 5 m 3 /h. This novel test was first continuously run for 150 h (15 recycling runs), and the recycling sludge was cycle used. The results showed a significantly higher removal efficiency of turbidity from the raw water than that of the traditional process, which was probably attributed to the special long-range Van der Waals attractive force, the enhancement of the collision ratio among particles, and the similar "second dosage of coagulant" strategy after the recycling process. Charge neutralization and absorption have mainly enhanced the removal efficiency of organic matter with recycling sludge. To some extent, this enhancement is due to the open and porous structure of the reused sludge, which could absorb the metal ions and further remove them following the sedimentation process. Recycling sludge is a feasible and successful method to enhance pollutant removal and has a significant effect on the treatment of low-turbidity source water.

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Full‐Scale Assessment of waste filter backwash recycle

Tobiason¹,

Edzwald²,

Levesque³

et al. 2003

Journal AWWA

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This article provides the results of studies of full-scale waste filter backwash water (FBW) recycle practices and water quality effects at six water treatment plants as well as recommendations for evaluating FBW recycle practices. Water quality parameters assessed included suspended solids, turbidity, particle counts, total and dissolved organic carbon, aluminum, and manganese. Results showed insignificant effects on plant influent water quality for recycle of clarified FBW and for a plant with continuous recycle. The FBW recycle quality was highly temporally variable for plants with only flow equalization (no solids removal), exhibiting significant peaks in solids levels that caused significant short-term increases in plant influent turbidity. However, the performance of downstream clarification (dissolved-air flotation or plate sedimentation) and filtration were not affected by FBW recycle for these plants. Evaluation of recycle effects requires knowledge of the site-specific details of plant operation (generation of recycle streams, flow control) and the chemistry of process waters (raw, recycle, and coagulated). FIGURE 2S St ta am mf fo or rd d W Wa at te er r T Tr re ea at tm me en nt t P Pl la an nt t s sc ch he em ma at ti ic c

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Effects of waste filter backwash recycle operation on clarification and filtration

Cited by 10 publications

References 0 publications

The Study of Possibilities for Reuse of Washings from Swimming Pool Circulation Systems

The Study of Possibilities for Reuse of Washings from Swimming Pool Circulation Systems

The impact of recycling sludge on water quality in coagulation for treating low-turbidity source water

Full‐Scale Assessment of waste filter backwash recycle

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