The Utilization of Waste Water from a Concrete Plant in the Production of Cement Composites

Klus, Lukáš; Václavík, Vojtěch; Dvorský, Tomáš; Svoboda, Jakub; Papesch, R

doi:10.3390/buildings7040120

Cited by 15 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Based on the raw WWW electrical conductivity (Ec) (11,854 µS/cm) and the total dissolved salts (TDS) (7097 mg/L), it can be classified as high saline brackish waste water. Klus et al [13] reported that the raw waste water from a ready mix concrete plant has a pH value of 12.5 and Ec of 13,390 µS/cm, indicating the results presented here were consistent with previous research. The high pH was mainly attributed to the dissolved alkali hydroxides such as Ca(OH) 2 , Mg(OH) 2 , NaOH, and KOH.…”

Section: Chemical and Physical Propertiessupporting

confidence: 92%

“…Previous studies have shown promising results regarding the recycling of ready-mixed concrete waste water in several ratios with fresh water for concrete production [11,12]. Klus et al [13] reported that recycling the waste water from concrete plant as partial replacement of mixing water (20%, 50%) in mortar production is possible without harmfully affecting the mechanical properties. The results revealed that using WWW led to a 15 min reduction in the setting time and increased the flexural strength as well as the compressive strength at 28 days of age.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

Waste Wash-Water Recycling in Ready Mix Concrete Plants

et al. 2020

View full text Add to dashboard Cite

The management of waste wash-water (WWW) is one of the most significant environmental problems associated with ready-mix concrete production worldwide. The problems are exacerbated should it be disposed of in an inappropriate manner. This study evaluated the potential of WWW recycling in ready mix concrete plants in Jordan. A representative waste wash-water sample (400 L) was collected from a basin in a ready-mix concrete company. A pilot plant on the lab scale was fabricated and installed. The treatment system consisted of a concrete washout reclaimer, wedgebed slurry settling pond, slow sand filtration unit, and a neutralization unit. Water samples were collected from all stages of the pilot plant and analyzed. The collected waste wash-water samples were utilized for replacement of well water (mixing water) at various ratios. Fourteen concrete mixtures were produced and cast, as well as tested at various curing ages (7, 28, and 90 days). The results show that the raw WWW was not acceptable as mixing water even after dilution as it led to significant reductions in concrete compressive strength and low workability. However, the WWW from the settling pond, the filtered WWW and the filtered-neutralized WWW at dilution ratios up to 75% were shown to be potential alternatives to fresh water for ready-mixed concrete. Therefore, the current guidelines for mixing water quality should be revised to encourage the reuse of the WWW.

show abstract

Section: Chemical and Physical Propertiessupporting

confidence: 92%

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Waste Wash-Water Recycling in Ready Mix Concrete Plants

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The existing final filtrate still has high turbidity and high COD, polluting the surrounding mangrove areas. In fact, this water still can be processed further to be reused for washing vehicles transporting liquid concrete, for domestic use in bathrooms and toilets, even as processing water (Chen et al, 2020Klus et al, 2017;Ekolu & Dawneerangen, 2010)…”

Section: Introduction 11 Backgroundmentioning

confidence: 99%

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

2022

View full text Add to dashboard Cite

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

show abstract

“…24 For special contaminants, they can also be bound by chemical actions through formation of insoluble complexes or hydroxides in alkaline environment, 25 ion exchange between wastes and crystalline phases, 26,27 or ion integration in defects of amorphous products. 28,29 Though having an effective solidication, it usually takes several hours for cement to set to solidify wastes, 30,31 and may be even longer when some types of wastes inhibit cement reacting with water. [32][33][34] Therefore, cementitious solidication method sometimes is hard to be considered as a time-efficient technique and is difficult to achieve rapid solidication when emergencies occur.…”

Section: Introductionmentioning

confidence: 99%