With the country's increasing attention to environmental protection, especially the implementation of 20 15, 1 New Environmental Protection Law, the supervision of wastewater discharge concentration of enterprises has been gradually strengthened. Guangzhou Liyuan Environmental Protection Technology Co., Ltd. has undertaken more than 200 sewage and waste gas treatment projects and technical service projects since its establishment. Our company has a complete treatment technology for wastewater with COD exceeding the standard. The company keeps pioneering and innovating, regards customers as God, takes technology as the core, regards quality and reputation as life, and wholeheartedly provides the most cost-effective works and meticulous after-sales service, which has won recognition and praise from many customers.
First, the enterprise's own production reasons
1) enterprises expand production, and the amount of sewage and wastewater increases.
With the development of enterprises, enterprises have gradually increased their production capacity, and the amount of sewage and wastewater has also gradually increased. Such as food processing enterprises, printing and dyeing enterprises, etc. The sewage treatment load is too large, and the effluent concentration exceeds the standard.
2) When the production process changes, the mass concentration of wastewater changes.
With the upgrading of production technology, the concentration of sewage and wastewater increases and the biodegradability decreases. Especially in chemical enterprises, wastewater treatment is more difficult. The sewage treatment load is too large, the effluent concentration exceeds the standard, and even the biochemical system of sewage station deteriorates and collapses.
3) Employees are dedicated and discharge sewage and wastewater without organization.
In the production process, employees failed to operate according to the standard, resulting in unqualified finished products, and the unqualified product water was directly flushed into the sewer, which led to the doubling of the pollution concentration of sewage and wastewater, which brought impact to the sewage treatment system, the effluent concentration exceeded the standard, and the biochemical system deteriorated and collapsed.
Second, the operation requirements of the polluter control
Sewage operators don't know enough about the process, operation parameters and equipment characteristics of the sewage treatment system, so they can't guarantee the normal operation of the sewage treatment system.
1)PH value.
PH If the influent PH value is too high or too low, the flocculation and sedimentation effect is not good, and the microorganisms in the biochemical system are not adapted, resulting in the effluent exceeding the standard. Especially if the PH value is too low, anaerobic microorganisms will easily cause acidification and the anaerobic system will collapse.
2) The temperature of anaerobic biochemical system is too low.
Up to now, most anaerobic wastewater treatment systems operate in the middle temperature range of 30-40℃, and the anaerobic reaction speed increases by about 30-50% every time the temperature rises by 65438 0℃ in this range. When the temperature is lower than 65438 05℃, the activity of anaerobic microorganisms is close to dormancy. Defects in wastewater treatment process
Third, the wastewater design engineer does not know enough about the composition of enterprise wastewater or has insufficient design experience, which leads to defects in wastewater treatment process design and can not meet the wastewater treatment capacity.
1) The operating load of wastewater exceeds the design load, resulting in the effluent COD exceeding the standard.
2) Due to lack of design experience, equipment selection is wrong. If the fan model is wrong, the air volume is too large, and the dissolved oxygen in the aerobic tank is too high, the sludge in the aerobic system will oxidize itself, the treatment capacity will decrease, the treatment effect will become worse, and the effluent will become turbid; The air volume is too small, the dissolved oxygen in the aerobic tank is low, which can not meet the growth of microorganisms in the aerobic tank, and the COD concentration in the effluent exceeds the standard.
Fourth, the solution
In order to cope with the excessive discharge of COD in sewage, the following measures should be taken:
1. Strengthen the management of production enterprises, improve the operation skills and professionalism of production employees, and reduce the generation of abnormal wastewater.
2, strengthen the skills training of sewage station operators, improve the understanding of sewage treatment system.
3. If the amount of sewage and wastewater increases beyond the sewage design load, it is suggested to increase the sewage treatment station.
4. For enterprises that change the production process, which leads to the increase of sewage concentration or the decrease of biodegradability, we can consider effective pretreatment of sewage before it enters the biochemical system to reduce COD and improve the biodegradability of sewage.
5. For enterprises with less wastewater discharge exceeding the standard, a neutral oxidation bed can be added on the basis of the existing effluent to reduce the COD of the effluent and make it discharge up to the standard.