Control of corrosive water in advanced water treatment plant by manipulating calcium carbonate precipitation potential

Abstract

The corrosion of metal pipes in water distribution networks is a complex electrochemical and physicochemical phenomenon between a metal surface and corrosive water. The level of corrosion in water distribution systems was controlled by manipulating the calcium carbonate precipitation potential (CCPP) concentration, and the corrosive water quality was controlled in two steps within the advanced water treatment plant (AWTP) constructed at the Institute of Water Quality Research (IWQR), Busan Metropolitan City, Korea. The 1 st control step was located before a coagulation process included on a rapid mixer, and the 2 nd control step was located after a biological activated carbon (BAC) process. The capacity of the AWTP in IWQR was 80 m 3 /day. The CCPP concentration was controlled from the calcium hardness, alkalinity, and pH by adding calcium hydroxide (Ca(OH) 2 ), sodium carbonate (Na 2 CO 3 ), and carbon dioxide (CO 2 ) in the above two steps. A CCPP control system was installed and operated according to the developed algorithm to maintain a CCPP range of 0-4 mg/L. The CCPP range was reasonably controlled to induce the formation of a CaCO 3 film on the surface of the simulated water distribution system (SWDS). From the result of the corrosive water control, the CCPP formed greater than 0.0 mg/L. The crystalloid structure of the scale produced by CCPP control in the inner surface of pipe was zinc carbonate hydroxide hydrate (Zn 4 CO 3 (OH) 6 ·H 2 O).

Natural polymers as alternative adsorbents and treatment agents for water remediation

“…nitrates or phosphates) or other heavy ions into salts or gelatinous precipitates that can easily be removed from water lines and treatment plants. Depending on the substance that needs to be removed, a combination of buffer salts can be added to improve the salting out of the pollutants; some examples are the use of calcium salts for phosphate anions removal or sodium carbonate with iron trichloride for radioactive strontium removal (Tomson and Vignona 1984;Nyberg et al 1994;Kim et al 2009;Lemlikchi et al 2012;Luo et al 2013). With the precipitates formed and the newly added ions free in the water, the filtration and adsorption to the filter are key points for the improvement of the water quality.…”

Impact assessment for water pressure and turbidity occurrence by changes in water flow rate of large consumer at water distribution networks

“…용 증가를 보여주고 있다 (Prince et al, 2001 (Gaffney and Boult, 2012;Vreeburg and Boxall, 2007;Kim et al, 2008;Kim et al, 2009). 상수관망의 수…”