In the industrial circulating water system, water treatment agents are usually added to control the corrosion and scaling of the equipment. Polyaspartic acid (PASP) has the characteristics of high efficiency of scale inhibition and corrosion inhibition, non- toxic, biodegradable as a new type of green and environmental water treatment agent. Therefore, more and more people are studying the PASP. In this work, the optimum formula of the PASP was obtained by using the orthogonal test method, which was composed of 10 mg/LPASP, 0.5 mg/L benzotriazole (BTA), 20 mg/Lsodium tungstate (Tun) and 10 mg/Lsodium gluconate (Glu). The methods of scanning electron microscope (SEM) analysis, small dynamic simulation experiment, electrochemical test and biodegradation test were employed to study the optimum formula performance. It is especially emphasized that the copper scale inhibition rate and corrosion inhibition rate reached 99.22% and 0.0006mm/a, respectively, the biodegradation rate can reach up to 75.1% in 28 days. The experimental results show that the optimum formula solution has excellent effect of scale and corrosion inhibition, and has a strong characteristic of biodegradation, which belongs to a new type of green and environmental water treatment agent.
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