运用生物循环理论建立多元生物污水处理新工艺

以活性污泥法为主流工艺的现代污水处理技术,存在着工程投资大，运行费用高，管理复杂等缺点，按照生物循环基本理论要示是不完善的。多元生物污水处理是按照食物链代谢规律,运有生物循环理论，设计成微生物－植物－水生动物3个处理单元。污水中的有机物作为微生物人良料在第1单元被套氧微生物消化降解成CO2，H2O，NH^ 4,CH^-4等，除CH4作为生物能源可回收利用外，其它物质是植物的营养物质，在第2单元藻类等多种植物吸收，通过光合作用合成植物细胞，并释放氧气，在第1单元和第2单元增殖的细胞和藻类成为水生动物的食料，在第3单元被浮游动物和鱼类捕食，转化成动物蛋白，污水中的有机物在3个单元组成的生态净化系统中，被多样生物逐级利用，最终转化成植物细胞和动物蛋白，使污水得到净化，达到三级处理水平，不产生二次污 ，是一种安全的，对环境友好的污水处理新技术，在国外被誉为21世纪的新科技。该污水净化系统，按照生物循环基本理论进行工艺设计，通过生态平衡自我调控，具有工艺流程简单，投资省，运行费用低，管理简便等优点，适合我国国情，有广阔的应用前景，尤其适有于小城镇污水处理。

New Wastewater Disposal Technology of Varied Organisms Based on Biological Circulation Theory

There are still some defects in the modern wastewater biological disposal technology. These defects are greater investment, more needed power supply and inconvenient management. In the wastewater purification system of varied organisms, wastewater is purified according to the metabolism of the food chain step by step. The system is composed of three disposal units of microbes, plants and aquatic animals. The organic matter in wastewater is digested and resolved into CO 2, H 2O, NH + 4, CH 4 and PO 3- 4 etc. by anaerobe in the first unit. When wastewater flows through the second unit, each component, except CH 4, is absorbed by algae or plants and transformed into cells of plants by dependence of photosynthesis. In the third unit, by the planktons or fish, the excessive microbes and algae are fed on and transformed into animal albumen. Finally wastewater is purified, and its effect can reach the level of the third grade disposal. The wastewater purification technique of varied organisms is a safe disposal technique ecologically friendly to the environment. It will be a new technique of 21 st century. There are many advantages in the wastewater purification system of varied organisms : smaller investment, less running fee and convenient management. It has a good prospect for application, especially suitable for wastewater disposal in small towns.