Abstract
Scaling commonly occurs at pipe wall during landfill leachate collection and transportation, which may give rise to pipe rupture, thus posing harm to public health and environment. To prevent scaling, this study prepared a low surface energy nanocomposite by incorporating silicone-acrylate polymer and hydrophobically modified nano-SiO2 into the high-density polyethylene (HDPE) substrate. Through the characterization of contact angle, scanning electron microscopy and thermogravimetry, the results showed that the prepared composite has low wettability and surface free energy, excellent thermal stability and acid-base resistance. In addition, the prepared composite was compared with the commercial HDPE pipe material regarding their performance on anti-scaling by using an immersion test that places their samples into a simulated landfill leachate. It was apparent that the prepared composite shows better scaling resistance. The study further expects to provide insight into pipe materials design and manufacture, thus to improve landfill leachate collection and transportation.
Highlights
Landfill leachate has high chemical oxygen demand and complex constitutions, due to the large number of organic and inorganic pollutants contained [1]
This study prepares a low surface energy silicified acrylate copolymer by bulk polymerization. Such copolymer is added by melt blending with High density polyethylene (HDPE) resin and different content of hydrophobic nano-SiO2 to prepare a nano-composite, entitled HDPE/PSA/SiO2 composite
Through the characterization of Fourier Transform Infrared (FTIR), TG, contact angle (CA), scanning electron microscopy (SEM), etc., it is confirmed that PSA and hydrophobic nano-SiO2 are successfully synthesized, such that there is no other organic solvent in addition to the reaction monomer
Summary
Landfill leachate has high chemical oxygen demand and complex constitutions, due to the large number of organic and inorganic pollutants contained [1]. Conventional engineering measures have mainly focused on pipe cleaning, including aeration in the pipeline [6], adjustment of hydraulic loading [7], high-pressure water jetting [8], addition of scale inhibitors [9], etc. Such engineering measures are constrained by their implementation of frequency and associated operation costs, which may not substantially prevent pipe scaling [9,10]
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