影响能见度的空气污染因子，不仅包括一次源，还应包括经由气-粒转化化学反应而产生的硫酸盐、硝酸盐等二次污染粒子。
Air pollution factors include sulfate or nitrate second particles derived from gas-to-particle transformation as well as original particles.
在硫酸盐还原作用下已经固定在污泥中的重金属，可能会由于污泥的氧化而二次释放。
Heavy metals originally immobilized by sulfate reduction in sludge barrier may be released out secondarily because of the oxidation of sludge.
在硫酸盐还原作用下已经固定在污泥中的重金属，可能会由于污泥的氧化而二次释放。
Heavy metals originally immobilized by sulfate reduction in sludge barrier may be released out secondarily because of the oxidation of sludge.
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