Research And Development On Coagulation Module Of Portable And Assembled Equipment For Emergency Treatment In Drinking Water Sources

In recent years,the number of sudden pollution incidents of various drinking water sources in China continues to be high,and the degree of damage and threats is also increasing.The emergency management of drinking water sources has become an important research direction.Based on the scientific research projects undertaken by the South China Environmental Science Research Institute of the Ministry of Environmental Protection,this article selected Cr?VI?and Cu²⁺ as the research objects.With the goal of ensuring the safety of drinking water sources,the research and development of the portable assembly equipment coagulation module was carried out.Through the small-scale test phase,the pilot phase and the cyclic test phase,the key parameters such as the drug pool parameters,the coagulation tank parameters,and the coagulation equipment cycle of the emergency disposal portable assembly equipment were obtained.The main conclusions are:?1?The removal efficiency of Cr???was reached91.7%,under the conditions of low temperature and turbidity at pH=8,PACS dosage 200mg·L-1,PAM dosage 6mg·L-1.The order of influence on Cr???removal efficiency is : pH>PAM dosage>PACS dosage.The optimum parameters of orthogonal experiment were as follows:pH=8,PACS dosage 200mg·L-1,PAM dosage 8 mg·L-1,the removal efficiency of Cr???was 89.5%.?2?Under the conditions of low temperature and turbidity,the removal efficiency of Cu²⁺ was 92.86% at pH=8,PACS dosage 60mg·L-1,PAM dosage 6mg·L-1,standing time 30 min.The order of influence on Cu²⁺ removal efficiency is : pH>PAM dosage>PACS dosage.The optimum parameters of orthogonal experiment were:pH=8,PACS dosage 50mg·L-1,PAM dosage 8mg·L-1,Cu²⁺ removal efficiency was 91.23%.?3?By comparing the experiment of mechanical stirring and dissolving pool,the experiment of submerged stirring and dissolving pool,the experiment of self-flowing and dissolving pool of water,we can see that the mechanical stirring is the best and meets the fast conditions of emergency treatment.Therefore,the final experimental parameters of dissolving pool in emergency treatment are as follows:the stirring mode is mechanical stirring,the stirring speed is 80 r·min-1,the stirring time is 30s;Under the conditions of mechanical stirring,stirring for 3 min at a stirring speed of 80 r·min-1 and standing for 120 min after stirring,the removal rate of Cr???can reach 62.75% and the removal rate of Cu2 + can reach 90.33%.?4?The results of water inlet experiment showed that the turbidity of each sampling point of the simulated wastewater of the fifth water inlet experiment basically reached the same level.Therefore,emergency treatment device inlet height according to the bottom of the pool 5cm;By examining the effect of outlet height on removing Cu²⁺,the experimental results of outlet show that the removal rate of the first outlet is higher than that of the second outlet and the third outlet.Therefore,select the outlet height of 0.95 m from the bottom of the pool.?5?The experimental results of emergency disposal cycle show that the raw water inlet velocity and coagulant inlet velocity all have an effect on the removal of Cu²⁺,so the raw water inlet velocity is 1m·s-1 and the coagulant inlet velocity is 0.1 m·s-1.The above parameters provide an important reference for the research and development of the portable assembly-type coagulation equipment coagulation module.