Effects Of Interactions Between Pesticides And Microalgae On The Property Of MFC

Microalgae are the main aquatic ecosystems primary producers and play a vitalrole for the ecosystem balance and stability. Microalgae living conditions directlyreaction the aquatic ecosystem health, making it important evaluation indicators ofwater quality. Because of efficient and mass production modern agro-forestryincreasing depends on the chemical agents represented by pesticides. With the largenumber of application they run by farmland, woodland, livestock farms and evenresidential areas with surface runoff spread to rivers and lakes. So pesticides andmicroalgae have extensive and close contacts and their interaction impacting onaquatic ecosystems is inevitable. The microbial fuel cells (MFC) used Spirulina forthe electricity production microorganisms and research the effects of differentpesticides and different pesticide content on the battery power. Then we explore howto use wastewater containing pesticide producing electricity on the interactionsbetween microalgae and pesticides in the MFC environment, so as to remove pesticidepollution studies through the MFC for preparation.In this paper, we have researched the electricity property of Spirulinamicrobial fuel cells built by self-built dual-chamber microbial fuel cell in conditionsof30℃and3000lx. The results showed that the Spirulina MFC OCV stable at about500mV. When the out resistance is1000Ω，we got a maximum output power of14.66mW/m2. So the battery internal resistance is1000Ω. MFC open circuit voltageof negative response to light, the OCV under illumination decline, rising in darkconditions. Thus spirulina MFC electricity production algae photosynthesis andrespiration result of the role.When the Spirulina MFC is running, we add photosynthesis inhibitors(pesticides) and observe the change of OCV. When add pesticides we investigate theimpact of the light-dark cycle on battery voltage. Atrazine and glyphosate was electedto be pesticides. After added atrazine the voltage drop under illumination conditionsand the voltage remains stable under light and dark conditions. Atrazine inhibitedSpirulina photosynthesis electron transfer to the anode， while the oxygen ofphotosynthesis production also consume some electronic. Whereas in dark conditionsSpirulina cannot carry out photosynthesis, it can only rely on respiration productionelectricity and voltage remained stable; when add the glyphosate, the voltage dropunder lighting conditions and the voltage rise under dark conditions. Glyphosate inhibit photophosphorylation and does not inhibit electron transport. It is only todestroy the normal growth of Spirulina. As a result, Spirulina MFC electricityproduction by the Spirulina biofilm is result of photosynthesis and respiration jointaction.