安徽江北污水一厂排污口污水影响预测分析

当前较多的河流、湖泊受排污影响污染严重,文章根据安徽省江北污水一厂入河排污口的排放条件及纳污水域的水文条件对入河排污口排放污水的影响进行预测,根据预测结果,简单分析入河排污口设置的合理性。

城镇污水处理厂项目环境影响评价重点的研究

城镇污水处理厂作为一项环境保护工程,在发挥环境效益的同时,运行过程中排放的尾水、产生的恶臭和污泥等污染物对环境将产生不利影响。在进行污水处理厂项目环境影响评价时,应识别评价重点,目的是使环境影响预测和评价具有针对性,以发挥更大的环境效益。根据污水处理厂的工程特性,结合江门市江海污水处理厂工程环境影响评价的实践经验,提出污水处理厂环境影响评价应重点关注厂址环境合理性分析、污水处理工艺比选、尾水排放对水环境影响、恶臭对大气环境影响、污泥处置对环境影响等问题。

生物燃料乙醇生产废水水质变化对污水处理的影响

国内生物燃料乙醇生产,大多数以玉米、陈化水稻、木薯等淀粉质原料为主。生物燃料乙醇在生产过程中产生的高浓度有机废水会对周边生态环境造成严重不利影响,需要采用适宜的污水处理方式,切实提升乙醇生产期间的生态及环保效益。本文就针对此,分析生物燃料乙醇废水来源,提出生物燃料乙醇废水水质变化对污水处理的影响及处理措施,最后就污水处理工作提出自己的建议。

入河排污口设置对第三方的影响分析及防控措施——以中石油江苏长江中心项目为例

在污水排放口设置时,为了保护第三方的用水权益,必须采取相应的措施避免或减轻污水排放对附近水域水质的影响。以中石油江苏长江中心项目入河排污口为例,对附近水域受排污的影响及防控措施进行了分析。数学模型预测的结果表明,排污口附近数座水厂取水口水域的水质达不到饮用水Ⅱ类水质的要求。分析表明:通过设置污水处理厂、控制污染物排放强度和排放方式、选择污水排放时间、建立污水处理设施连锁系统、改变污染物迁移途径,可有效降低排污对附近水域的水质影响,满足取水厂取水水质要求。

西中岛北区入海排污口影响预测分析

当前渤海近岸海域污染较为严重,根据西中岛石化园区北区污水厂入海排污口的排放条件及纳污海域的水文条件对深海排放污水的影响进行预测,根据预测结果,论证入海排污口设置的合理性。

Effect of Irradiated Sewage Sludge on Crop Yield and Soil Nitrogen

A field experiment was conducted to study the feasibility of irradiated and non-irradiated sewage sludge as a fertilizer for the growth of wheat and rice. The irradiated and non-irradiated sewage sludge were applied at rates of 0 (CK), 75, 150, 225 and 300 kg N ha-1 for wheat, and 0 (CK), 112.5, 225, 337.5 and 450 kg N ha-1 for rice, respectively. (NH4)2SO4 at a rate of 150 kg N ha-1 for wheat, and 225 kg N ha-1 for rice were added to the control treatments. Additionally, 20 kg 15N ha-1 in the form of (NH4)2SO4 was added to each treatment for wheat to study the effect of sewage sludge on chemical nitrogen fertilizer recovery. The results showed that the irradiation of sewage sludge by gamma ray at a dosage of 5 kGy increased crop yield by 11%～27% as compared to the non-irradiated treatments. Irradiation stimulated mineralization of organic nitrogen in the sludge and improved seedling growth. It was found that addition of irradiated sludge could reduce the leaching loss of chemical nitrogen fertilizer. Both irradiated and non-irradiated sewage sludge could increase the content of soil total nitrogen. Based on the preliminary results, it was concluded that irradiated sewage sludge could partly substitute for chemical nitrogen fertilizer in crop production.

Filtering Surface Water with a Polyurethane-based Hollow Fiber Membrane: Effects of Operating Pressure on Membrane Fouling

Membrane fouling seriously restricts applications of membrane technology. A novel strategy was applied in this study to retard membrane fouling by changing operating pressure with the pressure responsibility membrane. A polyurethane-based hollow fiber membrane was used to treat surface water for evaluating the effect of operating pressure on membrane fouling. Some bench-scale tests in dead-end mode were carried out. In the experiments without backwashing, as operating pressure increased, severe membrane fouling occurred on membrane surface, while the permeate quality was improved obviously, which is considered to be due to shrinkage deformation. The total resistance, irreversible resistance and reversible resistance under different backwash pressures were determined in filtration/backwashing test. With the increase of backwash pressure, the total resistance decreased, and more importantly, the irreversible resistance also decreased, which implies that small particles deposited inside membrane pores and cake layers on membrane surface are effectively removed. Similar results could be obtained in mass balance tests. The results of the present study indicate that the application of pressure responsibility membrane in surface water treatment may be an effective strategy for reducing membrane fouling.

生物学活动课中的实验设计与探究

活动课是课堂教学的拓展和延伸,是提高学生综合素质的重要途经。在"调查蛟龙港活水公园污水处理的工艺流程"这一活动课中,为了探究污水对生物及环境的影响,学生设计并完成了3组实验:污水对小鱼生活的影响,污水对小麦种子萌发及幼苗生长的影响,污泥对天竺葵生长的影响。通过实验的设计与探究,学生体验了科学研究的过程与方法,培养了探究能力和思维能力,形成了严谨务实的科学态度和勇于战胜困难的科学精神。