Concrete mixing plant waste water waste pulp properties

For test samples with a better representation, respectively in Beijing, Shanghai, Wuhan, Chongqing, Zhejiang, Taizhou and Zhoushan, Zhejiang chose 6 concrete batching plant for waste water waste slurry sampling, sampling locations for waste water disposal system of concrete mixing station waste slurry mixing of waste water in the pool. The appearance of waste pulp wastewater, usually muddy contain solid particles of a liquid.

Waste water waste pulp content determined mainly on the basis of the geological survey and water quality analysis of hydropower and water conservancy project Regulation (DL/T 5194-2004) in the test method. Listing 6 mixing waste slurry of ion content of waste water, 6 kinds of waste pulp wastewater pH values greater than 12, which belongs to the strong alkaline liquid. In cation content for Ca2+, anions in the highest OH-content, these two kinds of ions to cement hydration products. SO42-in anion and cations k +, na + content is relatively high, because preliminary analysis of belt type concrete batching plant is still dominated by naphthalene water reducing agent, resulting in waste water contained more sulfate in waste pulp. Zhejiang Zhoushan and Taizhou waste water waste slurry of concrete mixing station in the high Cl-content, more than 200mg/L (mass fraction of 0.02%), mainly because of Zhoushan and Taizhou used widely desalted sea sand as fine aggregate, sand after purification, but remains of chloride ions. Total amount of cations and anions of the concrete standard (JGJ63-2006) compares the waste slurry waste water in Chongqing and Zhejiang Taizhou ion content of more than 2000mg/L, 2537 mg/L and 2636mg/L, respectively, Beijing also 1917 waste pulp wastewater total ion of mg/l, total anions are higher, part has exceeded the standard limit. If the above waste slurry direct discharge of waste water, it would seriously pollute the environment and soil; if its use in the production of concrete must be verified by test on performance of concrete or mortar.