Treatment of concrete wash wastewater from ready-mix concrete operations

Mohamed, Abdel‐Mohsen O.; Shorbagy, Walid El; Mohammed, Imad; Gawad, Essam Abdel

doi:10.1080/19443994.2013.852137

Cited by 10 publications

(8 citation statements)

References 4 publications

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“…There are several methods used by the existing RMC plant that have been reported (Table 5), from settling box (Tsimas, & Zervaki, 2011, de Matos et al, 2020, slow sand filter (Ghrair et al, 2020), treatment using BaCl2 (Mohamed et al, 2017), and using a combination of Moringa, alum and FeCl3. Water pit 13−13.5 <40,000 ppm (Sandrolini & Franzoni, 2001) Slow sand filter 12.70  9,000 ppm (Ghrair et al, 2020) BaCl2 treatment 12.60 5,890 ppm (Mohamed et al, 2015) Moringa+alum +FeCl3 9.5 10.14 NTU (Paula et al, 2018, Férriz-Papi, 2014 The quality of all recycled wastewater meets the standards of ASTM C1602, which the normative solid content of concrete mixing water is <50,000 ppm. In this work, the filtrate solid content is comparable with the process that used Moringa, which successfully removed 99.88% of the turbidity with initial wastewater turbidity of 84.5 NTU (28,1 ppm) using a combination of 0.36 g/L alum, 0.47 g/L Moringa dan 0.18 g/L FeCl3 (Paula et al, 2018, Férriz-Papi, 2014.…”

Section: Simulation Of Wastewater Treatmentmentioning

confidence: 97%

“…Existing palm fibre filters can only reduce the COD to 146 mg/L (Table 2), which does not meet the requirements for disposal into the environment. The high COD value may be contributed by the solid content derived from cement and other admixtures (Holley et al, 2019, Tsimas, & Zervaki, 2011, He et al, 2020, Mohamed et al, 2015, Chen et al, 2020. The first trial of the wastewater treatment used alum as the coagulant.…”

Section: The Solid Content Of Wastewatermentioning

confidence: 99%

“…The pH of wastewater is not always been maintained by the ready-mix concrete factory (Cosgun & Esin, 2006, Ghrair et al, 2018. The alkalinity of the wash water can be reduced by using barium chloride and carbon dioxide bubbling (Mohamed et al, 2015) or by using strongly acidic volcanic ash or flue gas of solid waste incineration plant (Morita, 1992). Reusable wastewater for mortar production is with maximum TDS of 5,000 ppm, maximum alkalinity of 1,800 mg/L, range of pH between 10.5 and 11.5, maximum total hardness of 1,000 mg/L, and maximum turbidity of 280 NTU (Sharkawi et al, 2017).…”

Section: Simulation Of Wastewater Treatmentmentioning

confidence: 99%

“…This wastewater is categorized as hazardous waste (Tsimas & Zervaki, 2011, Sharkawi et al, 2017. Generally, batching plant slurry contains water, nonhydrated cement particles, and residual mineral admixtures/additives, which pH could reach more than 12 (Tsimas & Zervaki, 2011, He et al, 2020, Mohamed et al, 2015.…”

Section: Introduction 11 Backgroundmentioning

confidence: 99%

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Treatment of Mixer Truck Wash Water of a Ready-mix Concrete Batching Plant Using a Low Cost Modified Sand Filter

2022

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ABSTRAK Pembangunan infrastruktur dan perumahan membutuhkan beton dalam jumlah besar, yang sebagian dipasok oleh pabrik beton siap pakai. Tingginya kebutuhan air dan produksi air limbah oleh industri ini menyebabkan masalah lingkungan yang signifikan. Sebuah pabrik beton di Bali mengolah air limbahnya dengan lima kolam sedimentasi sederhana yang dilengkapi dengan saringan ijuk antar kolam dan kemudian air hasil olahan dibuang ke hutan bakau di sekitarnya. Meskipun nilai Chemical Oxygen Demand (COD) telah diturunkan dari 316,149 mg/L menjadi 146 mg/L, air limbah ini masih berpotensi merusak biota hutan bakau. Padahal, air bisa didaur ulang untuk membersihkan peralatan atau bahkan menjadi air proses. Penelitian ini bertujuan merancang proses pengolahan yang sederhana dan murah beserta peralatannya. Air limbah yang berasal dari bak pengendapan di pabrik beton siap pakai diolah di laboratorium menggunakan tawas tetapi hasilnya tidak memuaskan sehingga dipilih metode fisika dengan menggunakan kolam sedimentasi dan saringan pasir lambat yang dimodifikasi, dan berhasil menurunkan nilai COD sebesar 82,83% pada pH 12,27 dan mendaur ulang 84% air limbah atau 26,7% kebutuhan air total industri ini. Kata kunci: pengolahan air limbah, beton siap pakai, desain bangunan, daur ulang air ABSTRACT Infrastructure and housing developments require vast quantities of concrete, which are supplied by the ready-mix concrete (RMC) batching plant. This industry's high water demand and wastewater generation have caused significant environmental problems. An RMC batching plant in the southern part of Bali produces liquid waste, which is disposed of into the surrounding mangrove forests after being treated using five sequential unlined wash water ponds and palm fibre. Although the COD value has been decreased from 316.149 mg/L of untreated wastewater to 146 mg/L after treatment, this still has the potential to harm the mangrove biota. On the other hand, the water can still be reclaimed for cleaning purposes or even incorporated into process water. The work aims to design a low cost and simple wastewater recycling process and equipment. Wastewater was collected from the existing settling basin at the RMC batching plant and treated in the laboratory. It was found that the chemical treatment of wastewater using alum did not produce satisfactory results; therefore, a physical method was chosen by employing a sedimentation pond and a modified slow sand filter. It removed 82.83% of the COD at pH 12.270 and reclaimed 84% wash water or 26.7% of total water needed for this industry. Keywords: wastewater treatment, ready-mix concrete, building design, water recycles

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Section: Simulation Of Wastewater Treatmentmentioning

confidence: 97%

Section: The Solid Content Of Wastewatermentioning

confidence: 99%

Section: Simulation Of Wastewater Treatmentmentioning

confidence: 99%

Section: Introduction 11 Backgroundmentioning

confidence: 99%

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Treatment of Mixer Truck Wash Water of a Ready-mix Concrete Batching Plant Using a Low Cost Modified Sand Filter

2022

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“…Concrete wash water (CWW) mainly comes from the water that was in contact with newly made buildings and from water used for cleaning concrete trucks. Due to the presence of high amounts of dissolved CaO and other hydroxides, the pH ranges from 11 to 12, making it toxic for fish and other aquatic life [ 27 ]. Consequently, many regulations have been imposed on industries and construction companies to handle CWW properly before disposal [ 28 ] and neutralization is extremely important.…”

Section: Introductionmentioning

confidence: 99%

Carbonate Micromotors for Treatment of Construction Effluents

Chattopadhyay

Sharan

Berndt³

et al. 2020

Nanomaterials

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Concrete in construction has recently gained media coverage for its negative CO2 footprint, but this is not the only problem associated with its use. Due to its chemical composition, freshly poured concrete changes the pH of water coming in contact with the surface to very alkaline values, requiring neutralization treatment before disposal. Conventional methods include the use of mineral acid or CO2 pumps, causing high costs to building companies. In this paper, we present a micromotor based remediation strategy, which consists of carbonate particles half-coated with citric acid. To achieve this half coverage spray coating is used for the first time to design Janus structures. The motors propel diffusiophoretically due to a self-generated gradient formed as the acid coverage dissolves. The locally lower pH contributes to the dissolution of the carbonate body. These motors have been employed to study neutralization of diluted concrete wash water (CWW) at microscopic scale and we achieve visualization of the pH changes occurring in the vicinity of motors using anthocyanine as pH indicator dye. The effect of citric acid-carbonates hybrid on neutralization of real CWW on macroscopic scale has also been studied. In addition, all employed chemicals are cheap, non-toxic and do not leave any solid residues behind.

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Fabrication and characterisation of a polyamide thin-film composite membrane on a nylon 6,6 substrate for isopropanol dehydration

Jusoh

Rahman

Ahmad

et al. 2019

Comptes Rendus. Chimie

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Thin-film composite (TFC) is feasible for use in isopropanol (IPA) dehydration by pervaporation (PV) for its superior performance and strength. The hydrophobic substrate membrane allows the penetration of the diamine monomer into the pores, which leads to flux reduction. Furthermore, hydrophobic polymer is difficult for TFC deposition because of its strong and opposing characteristics. To solve this problem, hydrophilic nylon 6,6 (N66) was introduced as a substrate in this application because of the balanced characteristics such as small distribution pores, great interaction with polyamide layer, and high mechanical strength to overcome the swelling weakness. TFC membranes were prepared by interfacial polymerisation (IP) method between m-phenylenediamine (MPD) and trimesoyl chloride (TMC) monomer. The chemical and physical properties were characterised by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, contact angle, and swelling test analyses. A fully aromatic polyamide group was detected at FTIR spectrum 1609e1610 cm À1 . Increasing the immersion time from 2 to 5 min in 2 wt % MPD and 1 min immersion in 0.1 wt % TMC solutions increased the thickness of the membranes from 40.0 to 56.3 mm. The contact angle decreased significantly from 50 to 35 after the modification, thereby obtaining better hydrophilic properties for interface to occur. In addition, continuous IPA sorption experiments for up to 24 h were carried out for pristine N66 and TFC membranes, using 60, 80 and 90 wt % IPA/water solutions. The degree of swelling increased with time as the water composition increased.

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Treatment of concrete wash wastewater from ready-mix concrete operations

Cited by 10 publications

References 4 publications

Treatment of Mixer Truck Wash Water of a Ready-mix Concrete Batching Plant Using a Low Cost Modified Sand Filter

Treatment of Mixer Truck Wash Water of a Ready-mix Concrete Batching Plant Using a Low Cost Modified Sand Filter

Carbonate Micromotors for Treatment of Construction Effluents

Fabrication and characterisation of a polyamide thin-film composite membrane on a nylon 6,6 substrate for isopropanol dehydration

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