title: [Bulking controls induced by nitrogen insufficiency in yeast system].
abstract: The effect of nitrogen addition to salad oil manufacturing wastewater system was studied. The results of batch experiments demonstrated: 1. addition of nitrogen was helpful to improve oil removal, and the oil removal rate was above 90% when COD/N value was between 50/1 and 20/1; 2. addition of nitrogen improved the sludge settleability, which was much better under COD/N value of 50/1 and 20/1. In the continuous experiment, the value of slude volume index(SVI) was between 100 and 200, and the removal rates of oil and COD were above 95% and 90%, respectively when the COD/N ratio was kept at value of 20/1. Nitrogen addition to salad oil manufacturing wastewater system is an effective method for preventing or controlling sludge bulking.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, CAS, Beijing 100085, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Han
authors.forename: Qingxiang
authors.initials: Q
authors.lastname: Yang
authors.forename: Min
authors.initials: M
authors.lastname: Yang
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Shaokui
authors.initials: S
authors.lastname: Zheng
mesh_terms: D007220:Industrial Waste; D009584:Nitrogen / Q000378:metabolism*; D010938:Plant Oils / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D015003:Yeasts / Q000378:metabolism*
chemical_list: D007220:Industrial Waste; D010938:Plant Oils; D012722:Sewage; D009584:Nitrogen