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In the Netherlands, a large drinking water distribution system exists which composes of a complex network of underground pipes owned by several water companies. Part of the drinking water distributions pipes consist of cast iron pipes of which some have been installed more than 80 years ago.1 To prevent leaks, it is desirable to have insight into the condition of these pipes and the risk of leakages or even pipe bursts. During local replacements and maintenance work, corrosion is regularly found in the pipes and previous research7 has indicated that Microbiologically Influenced Corrosion (MIC) may be involved in this corrosion that is found in the pipes.
In the Netherlands, a large part of the drinking water distribution system consists of cast iron pipelines of which some have been installed and are used since the beginning of the last century. Previous investigations showed that corrosion deposits are present in many of those pipes and follow-up research showed that microbial processes have been involved in the corrosion damage. Due to the increase in water quality over the decades, the question was raised whether the MIC processes were still active in the water distribution system. To investigate whether the MIC processes were still active, RNA technology was used to investigate the microorganisms in the water distribution pipelines at corrosion defected areas. RNA is the genetic material which occurs in biological cells only when they are active. We applied two genetic technologies: RNA qPCR and RNA metagenomics by Next Generation Sequencing. With a combination of those techniques we could confirm that, despite the good water quality, MIC processes were still active and could form a direct risk in cast iron water pipes. Interestingly there seemed to be no relation between the water quality and the activity of MIC.
Hydrofluoric acid (HF) is used as a catalyst in the alkylation process to react isobutane with olefin feeds to manufacture a high octane alkylate product used in gasoline blending. The HF catalyst is added in its anhydrous liquid form (< 400 ppmw H2O) but as it circulates in the reaction system, residual water in the Paper No. 17520 liquid hydrocarbon feed is absorbed by the acid such that the circulating reaction acid builds up a small percentage (0.5 to 2.0 mass%) of water. This water/HF mixture is also referred to as rich HF (RHF). In addition, the alkylation reactions also will generate fluorocarbons and acid soluble oils (ASOs).
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MIC is a major threat to oil pipelines because it reduces the service life of pipelines and can potentially leads to catatrophes. Microbial communities commonly associated with pipeline corrosion include sulfate reducing bacteria (SRB), acid producing bacteria (APB), acetogenic bacteria and methanogens. In a field environment, SRB, APB and other microbes often live in a synergistic biofilm consortium. Sessile SRB are often the main culprit of MIC. They can utilize sulfate as the terminal electron acceptor and various carbon sources and elemental iron as electron donors. Corrosive APB biofilms are also a contributing factor in an acidic environment because they release H+ which is an oxidant.
Scale is an adherent deposit of inorganic compounds precipitated from water onto surfaces. Most oilfield waters contain certain amounts of dissolved calcium, barium or strontium salts. The mineral scale can be formed by chemical reactions in the formation water itself, by mixing of formation water with injected seawater, or by mixing of the well streams of two incompatible oilfield waters. In carbonate reservoirs, when calcium is deposited as calcium sulfate or calcium carbonate scale, a loss of production and increased maintenance expenses can result. Therefore, effective mitigation of scaling potential is of importance to the oil producers.