Investigating the effect of using colors containing copper oxide and zinc oxide (zinc-rich) on microbial corrosion behavior of sewage pipes

In this paper the effect of using zinc oxide and copper oxide dyes on the corrosion behavior of concrete sewer pipes in Marvdasht city which were applied by spray and brush on the inner surfaces of the pipes were investigated. 9 pipes were used in the sewage network. Four tubes were coated with copper oxide and four tubes were coated with zinc oxide. One tube was considered as a control tube. After painting, pipes were placed in the sewage flow for 217 days. To determine the amount of aerobic and non-aerobic bacteria in the sewage system, daily, weekly and monthly bacterial counting was performed. The results showed that the production of sulfide by SRB in coated tubes is reduced up to 100% compared with uncoated tube. Also, ocular studies showed that the sludge formed on zinc oxide containing pipes was much thinner and smaller than the unpolluted tube and was used in copper oxide-containing tubes to form a layer of sludge. It was narrower on the coating of zinc oxide. The results showed that sewage is domestic. The atomic absorption test was performed to determine the amount of copper and zinc ions entering the paint into the sewage. The results showed that the amount of heavy metals entering the effluent is less than the standard and therefore do not cause toxicity.