technological strength and brand reputation are important factors in the development of the company. since its establishment, shenzhen qingquan water industry co., ltd. has always attached importance to the talents and capital investment in technology research and development. with the development and expansion of shenzhen qingquan company, the technical strength and brand reputation have become more prominent in the industry. its classic engineering cases also provide an effective reference for the development of the industry.
meishan sewage treatment plant operation site in sichuan province
guided by mr. ye changming, chief engineer of shenzhen qingquan, and mr. liu jianwei, the technical r&d personnel of the company, wrote the paper “post-denitrification biological filter used for upgrading a municipal wastewater treatment plant”, which was selected by the industry's major media as a classic case of industry research and learning. , and published in china water & wastewater journal (april 34, 2018, issue 8, issue 8). this review documented and analyzed in depth the classical project case of shenzhen qingquan, the technical application and transformation results of the project of upgrading the municipal wastewater treatment plant (phase i) in meishan city, sichuan province.
the case description of the meishan city urban sewage treatment plant in sichuan province commenced operations in 2006 with a designed treatment scale of 4x10000m3/d. the actual average inflow of water before treatment was 3.5x10000m3/d, and the main process was the primary sedimentation tank plus the parallel four. two-stage biological aerated filter in the group, the total effluent tn and tp exceeds the standard, and the other indicators are basically the first-grade b standard. the reconstruction project began construction in august 2016 and passed the acceptance check of environmental protection in august 2017. the quality of the effluent meets the class a standard of the “emission standard of pollutants for municipal wastewater treatment plants” (gb 18918-2002), tn and tp, etc. some of the key indicators have exceeded level a standards and have so far been operating stably.
meishan sewage treatment plant operation site in sichuan province
before the transformation of the wastewater treatment plant, the following problems exist:
1 the sedimentation tank scraping and suction machine equipment is old, the suction pump is often blocked, manual flushing and dredging are required, and mud scraping is not smooth.
2 biological filter has poor biological phosphorus removal, resulting in effluent water quality tp often exceeded
3 the original design did not require total nitrogen. the secondary aeration biofilter process was adopted. total nitrogen removal was not considered, so there was basically no removal effect on total nitrogen.
4 the aeration biological filter adopts a single-hole membrane and the aeration is not uniform.
based on on-site investigations and based on the experience of designing and operating biofilters, the company adopted the following retrofit schemes based on no increase in the number of main structures and guaranteed emissions:
1 shenchi increases the dosage system, aeration system, sludge return system, replaces scraper suction machine, adopts coagulation process combined with ao biological clarifier technology, the effect of phosphorus removal is good, and the amount of phosphorus removal agent pfs is small (average is 20mg) /l)
2 the original liquid chlorine contact disinfection tank was changed to an ultraviolet sterilizer, and two sets of drum filters were added.
3using qingquan's invention patent “filter head for upstream flow filter” (patent no.: zl200710124272.2), this filter head has the function of water distribution and air distribution, and does not require single-hole membrane aerator, in order to save the cost denitrification filter using the original filter media.
the plant's upgrading and reconstruction project has achieved good economic benefits. the total project investment is 12.99.4 million yuan, the processing cost before the transformation in 2015 is 0.25 yuan/m3, and the processing cost after the transformation in august-december 2017 is 0.37 yuan/m3. after the transformation, the total cost of unit water increases by 0.12 yuan/m3, which greatly reduces the cost of operation and maintenance.
according to the actual operation, the post denitrification filter has obvious effects of nitrogen and phosphorus removal. the highest removal rate of tn is 95% when debugging, and the effluent water quality tn is 1.3 mg/l. without adding land or renovating the main structure of the original two-stage biological aerated filter, the effluent water quality after the transformation is stable, the operation is stable, and the effect is good. the total effluent water quality is before the renovation, the pollutant discharge standard of the urban sewage treatment plant. the grade i b standard of gb 18918-2002 was upgraded to level 1 a standard. the shenzhen qingquan technology is feasible and feasible, which provides an effective reference for similar projects of sewage treatment plants in the industry.
shenzhen qingquan was established in 1995 and has been specializing in the field of environmental protection water treatment for 23 years. it has obtained dozens of patents in filter fields, and has more than 500 successful project cases. it is the “design rule for upstream flow filter” in the national urban water supply and drainage industry. the standard drafting unit, the representative enterprise of non-membrane water treatment technology, and the leader of smart modular equipment water treatment. in the future, qingquan will continue to focus on technology research and development, invest more manpower, material and financial resources for technological research and development, and make every effort to contribute to the society as an environmental protection force.
