1. waste gas: the tail gas of the emergency chlorine gas treatment system (G 1) collects the waste chlorine gas under accident conditions and is treated by two-stage alkali spraying. The treatment efficiency is more than 99.9%, and the chlorine emission concentration is 40mg/m3, with a high emission of 25m, which conforms to the Comprehensive Emission Standard for Air Pollutants (GB 16297-65438). The hydrochloric acid synthesis of this project relies on the existing two-in-one furnace. Hydrogen chloride gas produced by hydrochloric acid synthesis furnace is produced by two-stage falling film absorber after cooling. The residual hydrogen chloride tail gas (G2) after hydrochloric acid production is absorbed by water absorption tower (treatment efficiency 90%) and alkali absorption tower (treatment efficiency 99%), and the tail gas is discharged from a height of 29m. Exhaust gas emission is 1000m3/h, the concentration of hydrogen chloride emission is 40mg/m3, and the emission rate is 0.04kg/h, which meets the secondary standard in Table 2 of Integrated Emission Standard for Air Pollutants (GB 16297- 1996). After the completion of this project, the tail gas emission of hydrogen chloride is 0.32t/a, of which the increase of this project is 0.16t/a. The unorganized emissions of chlor-alkali plant in this project are: chlorine gas: 0. 12kg/h, HCl: 0.06kg/h respectively.
2. Waste water: The waste water of this project includes production waste water, ground washing water, machine and pump cooling sealing water, domestic sewage, drainage of newly-added circulating water system and drainage of pure water preparation system. Among them, the filtrate produced by salt mud pressure filtration, dilute brine produced by electrolysis, condensed water produced by chlorine and hydrogen treatment and alkaline wastewater produced by resin regeneration are all reused in the salt melting section. Acidic wastewater (W 1), pump cooling, sealing water, domestic wastewater and ground washing wastewater generated in the process of chelating resin regeneration are sent to the second sewage treatment plant of Luxi Chemical Industry for treatment. After the wastewater from the expansion project was treated by the wastewater advanced treatment and reuse device, the RO effluent of 8. 13m3/h reached the water quality standard of industrial water for urban reclaimed water reuse (GB/T 19923-2005), and it was reused to make up water for the circulating water system. After the treatment of "ozone oxidation-biological contact oxidation", the concentration of COD is ≤60mg/L, and the concentration of ammonia nitrogen is ≤6mg/L, which can meet the requirements of Table 4 and the secondary standard of the Integrated Discharge Standard of Water Pollutants in Haihe River Basin of Shandong Province (DB37/675-2007), and the Notice on Agreeing to Publish the Revision of Four Standards, such as the Integrated Discharge Standard of Water Pollutants along the South-to-North Water Diversion Project in Shandong Province.
3. Solid waste: The solid waste generated by this project mainly includes salt mud, waste chelating resin, waste film, waste packaging materials and domestic garbage, which have been properly disposed of.
4. Noise: The main noise sources of this project are fans, compressors and various pumps. The noise level (single machine) is generally 80 ~ 95dB (A), and measures such as indoor installation and foundation vibration reduction are taken.
5. Environmental risk: The maximum credible accident risk value of the proposed project is lower than the allowable risk value of the chemical industry, and the risk is at an acceptable level. The risk control of the proposed project mainly adopts the following measures: 1. Ensure that the clearance volume of the cofferdam of the proposed project is greater than the maximum volume of the storage tank in it; 2. Accident wastewater collection measures: The newly-built 1000m3 accident pool in the expansion project is responsible for collecting the fire fighting drainage and initial rainwater in the expansion project. 3, equipped with flammable gas and toxic and harmful gas leakage detection and alarm system.
6. Protection distance: According to the forecast, the sanitary protection distance of 1000 meters must be set in this project with the device as the boundary. At present, there are villages such as Zhang Hongjin Village, Sihe Village, Hongmiao Zhao Village, Gaoshaoyu Village, Caofengtai Village, Liukuiyu Village and Suoji Village in this area. According to the report of Guan Fa [20 15], there are no sensitive points within the health protection distance after relocation, that is, the construction of this project meets the requirements of the health protection distance after relocation.