通气速率对城市污水厂出水培养微藻的生长及氮磷去除促进作用  

Influence of Aeration Rate on the Growth of Chlorella Vulgaris and Nitrogen and Phosphorus Removal Using Domestic Secondary Effluent

作　　者：周灿炜 刘小宁 陈光耀 应臻柯 陶益 Zhou Canwei1, Liu Xiaoning1,Chen Guangyao1, Ying Kezhen2, Tao Yi1,3(1. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055; 2. Ocean Science and Technology Department, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055; 3. Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen, Shenzhen 518055, Chin)

机构地区：[1]清华大学深圳研究生院深圳市环境微生物利用与安全控制重点实验室,广东深圳518055 [2]清华大学深圳研究生院海洋学部,广东深圳518055 [3]清华大学深圳研究生院广东省城市水循环与水环境安全保障工程技术研究中心,广东深圳518055

出　　处：《广东化工》2018年第14期93-95,87,共4页Guangdong Chemical Industry

基　　金：深圳市基础研究项目(JCYJ20160331185226856);水体污染控制与治理科技重大专项(2017ZX07202002)

摘　　要：利用微藻处理污水厂尾水可以进一步降低水中氮磷,实现污水深度处理和微藻生物质生产的耦合。提高微藻生长速率是提升系统效能的关键问题之一。本研究以普通小球藻处理实际城市污水厂二级出水,连续通入体积比10%的CO_2气体,考察了通气速率对微藻生物量和氮磷去除效果的影响。结果表明,提高CO_2通气速率可以显著提高处理二沉出水小球藻的比生长速率与生物量,其影响在3d后逐渐显著。通气速率600 mL·min^(-1)处理组的生物量最高可达0.59 g·L^(-1)的生物量,比生长速率最高达到0.76 d-1。通气速率提高有助于吹脱光合作用产生的氧气,但会使水体pH值降低至6~7的水平。40 mL·min^(-1)低通气速率最利于氮磷去除,在第3 d时总氮和总磷浓度已降低至1.0 mg·L^(-1)和0.1 mg·L^(-1)以下。高于200 mg·L^(-1)通气速率会造成氮磷去除速率下降。调控CO_2通气速率能够有助于同步优化氮磷污染物质去除和微藻生物质生产过程。Microalgae could be applied to domestic secondary effluent further treatment, coupling N, P nutrients further treatment with microalgae bioruass production. Enhance the specific growth rate was one of the key point in increasing system efficiency. This article treated secondary effluent of NS WWTP （Shenzhen, China） with C. vulgaris providing a continuous aeration with 10% carbon dioxide, the influence of aeration rates on microalgae bioruass production and N, P nutrients removal efficiency were investigated. The results showed that CO2 aeration rates could significantly increase the specific growth rate and biomass concentration of C. vulgaris, the influence of different aeration rates became significantly after 3 d cultivation. The highest biomass and specific growth rate could reach 0.59 g.L-1 and 0.76 d-1（600 mL·min-1 aeration group）, respectively. Increasing aeration rates do helps in blowing off the oxygen, on the other hand, the pH would decrease to 6-7. A low aeration rate of 40 mL-minl showed best pertbnnance on the removal of nitrate and phosphate. The total nitrogen and phosphorus concentrations could reduce to 1.0 mg.L-1 and 0.1 mg.L-1 after 4 d cultivation. Increasing CO2 aeration rate to over 200 mL.min-1 would result in a decrease of nitrogen and phosphorus removal rates. Regulate CO2 aeration rates carefully could help to optimize the simultaneous removal procedure of nitrogen, phosphorus pollutants and algae biomass production.

关 键 词：普通小球藻 城市二级出水 氦磷 通气速率 

分 类 号：X703[环境科学与工程—环境工程]