现代农业园倾向于观光农业,它作为一种有别于传统的农业形式,开启了人们对田园生活的畅想,本文通过对现代农业园进行分类研究和长沙周边地区农业园景观功能设计进行调查,对现代农业园景观功能设计存在一些问题进行总结。
Diethylene triamine-based lignin,a novel adsorbent for heavy metals was prepared with diethylene triamine and lignin by epichlorohydrin crosslink.The effects of pH,reaction time and initial concentration on the adsorption capacity of the beads for Cu2+,Ni2+were investigated.At 25 ℃,pH=5,the adsorption capacities of Cu2+,Ni2+by Diethylene triamine-based lignin were 44.84 mg/g,34.13 mg/g.The adsorption process followed pseudo-second-order kinetics and fit the Langmuir adsorption isotherm models.
本文综述了用于废水脱色的无机絮凝剂、有机絮凝剂、微生物絮凝剂、复合絮凝剂的脱色机理、利用情况、近期研究及前景。表明当前脱色絮凝剂正朝着无毒、高效、价廉、复合等方向发展。
The principle and the application scope of several methods to measure dissolved oxygen was summarized,the research progress of iodimetry,oxygen electrode method,spectrophotometry and fluorescence quenching method was mainly discussed.Its application future of the development on the detection of the dissolved oxygen was prospect.
A review is given of the methods using hydrogen peroxide and various types of flocculants for sewage treatment oxidation and flocculation,analyzed the mechanism and influencing factors of the reaction,identified the optimum reaction conditions.In order to provide the reference for future wastewater treatment.
