榕屏的官员称，工厂已花了数十万美元升级污水处理和化学制品储藏设施。
Rongping officials say the plant has spent hundreds of thousands of dollars to upgrade its wastewater-treatment and chemical-storage facilities.
粉煤灰虽然是一种固体废弃物，但已广泛应用于污水处理。
Fly ash is a solid waste, but it has been used in sewage treatment extensively.
城市生活污水污染负荷已超过工业废水污染负荷，处理工艺的优化就成为当今城市污水处理的重要课题。
Pollution load of city sewage has already exceed the sewage of industry pollution load, so the disposal technology optimizing became an important problem of dealing with city sewage nowadays.
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