山东青岛某酒精厂废水排放处理案例

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山东青岛某酒精厂废水排放处理案例

山东青岛某酒精厂废水排放处理案例

山东某酒精厂是采用木薯干原料生产酒精的工厂，年产酒精5万吨、无水乙醇1万吨，每天排放酒精废液1600t。废水处理工程设计规模1600m³/d。

该厂每天排放1600m³（木）薯干酒精废液（每年生产330d），废液COD为55000~60000mg/L，BOD为24000 mg/L，SS为22700mg/L，pH值为4.2。

处理工艺：

薯干酒精废液（原糟液），其COD:BOD=2:1，属于高温、高浓度、高SS、可生化性良好的的有机废液。采用厌氧-好氧法处理（木）薯干酒糟废液能回收大量沼气能源，并能将废液处理达标，是技术和经济均为佳的处理方式。

工艺原理：

由酒精蒸馏塔排出的薯干酒糟废液经废热回收后，进入沉砂池，在沉砂池中尽量将原料夹带的砂石去除。然后进入贮存池水解，再将废液用泵打入Ⅰ级全混合厌氧发酵罐（CSTR）进行高温厌氧发酵，发酵温度52~54℃，pH值控制在7.厌氧发酵罐内装有大型水力喷射泵和厌氧污泥回流装置。喷射泵用于罐内全混合搅拌，并可用于加热、破碎浮渣。厌氧发酵产生的沼气（每立方米COD为55000mg/L的废液可产30m³沼气，热值相当于30KG原煤）经气水分离，水封后进入沼气贮柜，用作锅炉燃料。

由Ⅱ级UASB和气浮装置排出的厌氧污泥送去脱水处理，作有机肥料。由SBR排出的好氧污泥返回酸化池，再进入Ⅰ级厌氧发酵罐处理，还可增加沼气产量。

SBR池：钢制，2座，单池有效容积1060m³，交替进行。

沼气贮柜：湿式贮气柜，容积25000m³，气压350mmH₂O。

工程评析

工程借鉴了轻工业环境保护研究所20多年来治理酒精（木薯干原料）废液的经验和工程实践，采用二级厌氧发酵，互为补充。将Ⅰ级和Ⅱ级串联，可获得厌氧微生物处理的佳效果，克服了仅采用厌氧处理难以达标的缺点。

Jining Tian Tong Environmental Protection Technology Co., Ltd. is an environmental protection enterprise which integrates R & D, production, sales, technology application and promotion. The company mainly undertake production and drinking water purification, sewage treatment engineering and environmental protection equipment manufacturing, sales business. The production of environmental protection equipment mainly includes the production and sale of buried integrated sewage treatment equipment, scraper and suction machine, air floater, inclined tube precipitator and filter tank. Environmental protection projects are mainly devoted to the design, construction, installation and commissioning of various industrial sewage, medical waste water and domestic sewage.

Jining Tian Tong equipment company and China University of Petroleum, Ocean University of China and other industry contacts in the many well-known colleges and universities, employing a number of well-known domestic and foreign experts to guide our teaching, achieve the company will continue to forge ahead, keep pace with the times, new technology, new achievements in practice, better realize the enterprise to reduce the emission of pollutants, protect the local the environment. Our company has a large number of elites who have long been engaged in the design and construction of sewage engineering, with rich experience and mature technology.