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Fig. 7 | Geothermal Energy

Fig. 7

From: Crystallization of calcium carbonate in a large-scale push–pull heat storage test in the Upper Jurassic carbonate aquifer

Fig. 7

Overview of particles collected at the field site (here, at an injection temperature of \(90\,^{\circ }\hbox {C}\)): low particle load on the filters with pore sizes of \(10\,\upmu \hbox {m}\) to \(1\,\upmu \hbox {m}\) (see picture 1–4) due to the \(\hbox {CO}_{2}\) addition. Only filters with \(0.1\,\upmu \hbox {m}\) pore sizes had a significant particle load (see picture 5). Mostly rounded particles are visible at pore sizes of 1–\(10\,\upmu \hbox {m}\) (see red circles). Pore sizes of \(0.1\,\upmu \hbox {m}\) showed a muddy matrix, and no crystals can be identified

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