1、幼儿“伤食”,食疗有方Tentative plan and suggestion on realizing the goal of tap water direct drinkingAuthor: Shenzhen water (Group) Co., Ltd. Luohu branchDeputy manager and senior engineer Chen LixinMailing address: No. 89, Xiu Nan Street, new talent village, Shenzhen, Luohu DistrictDeep water group Luohu bra
2、nchZip code: 518002 Tel: 13802212385 075525112378E-mail: Two years four, JulyTentative plan and suggestion on realizing the goal of tap water direct drinkingChenShenzhen Water Affairs (Group) Co., Ltd. Luohu branch, zip code: 518002I. General Situation of pipe networkLuohu branch within the jurisdic
3、tion of the existing 96433 users, the average daily water consumption of 246 thousand and 800 cubic meters, which is the proportion of all kinds of water: residents of water 21.91%, 25.49% residents of the 6.65% collective, municipal sanitation, industrial water 6.41%, commercial construction indust
4、ry 36.58%, a total of 2.96% other water. Water pipe in the municipal pipe above DN200 total length of more than 123 kilometers, municipal pipe is mainly cast iron pipe, steel pipe, reinforced concrete pipe, the use of DN15-DN100 pipe in the pipe network is mainly galvanized steel pipe. The company i
5、n 2000 after the pipe network transformation and the new network and vigorously promote the use of hard polyvinyl chloride (UPVC), polyethylene (PE) pipe and steel plastic composite pipe, according to incomplete statistics, all kinds of new pipe with a total length of about 25 km of UPVC pipe, PE pi
6、pe 12 km, 12 km of steel tubes. The area within the total valve 2868, the valve seat 6 DN2200 raw water, tap water pipe valve of DN1200 - 1, DN1000 - 40, DN800 - 27, DN600 - 87, DN500 - 10, DN400 - 123 seat, 43 seat mud valve, exhaust valve seat 49. A total of 1214 fire hydrants, including municipal
7、 road fire hydrants 750, fire hydrants 464.Two existing pumping stations 22, 3 seats have been disabled. The total number of service users of the two pressure pumping stations is about 13000, the daily average water supply is 6000 cubic meters, and the total capacity of the pressurized pumping stati
8、on is 4705 cubic meters. The largest area of water supply pumping station for cloth station, service users more than 7000 households, the daily water supply capacity of over 3000 cubic meters.Two. Water quality status1 、 water quality of manufactured water in East Lake WaterworksThe results of annua
9、l water quality statistics are shown in Table 1 belowTable 1Analysis projectStatistical item turbidity(NTU) residual chlorine(mg/l) number of bacteria(/ml) total coliforms(CFU/333 ml) 31 indicators of water quality comprehensive index of the minimum value of 0.06 0.6000 0.76 1.92210 0.20 maximum ave
10、rage pass rate of 0.9420 (%) 100 100 100 100 100 100.002, Luohu pipeline water qualityThe water quality testing center of the group company has 15 water quality testing points within the Luohu branch, and the annual statistical results of all the water quality in the test points are shown in table 2
11、.Table 2Analysis projectStatistical item turbidity(NTU) residual chlorine(mg/l) number of bacteria(/ml) total coliforms(CFU/333, ML) 31 indicators, the minimum water quality index 0.08, 0.1000, maximum 1.85, 1.56670, the average value of 0.31, 0.6640 pass rate (%), 100, 100, 100, 100, 100, 100, thre
12、e, and the main factors affecting the water quality of the pipe network1 、 water quality of manufactured water in East Lake WaterworksEast Lake water plant is the earliest water plant in Shenzhen. After several expansion and reconstruction, the existing process is conventional water purification pro
13、cess and pre ozonation treatment. According to the group “2003 - 2010 water quality development plan“ on improving the water quality of the factory project planning arrangements, East Lake waterworks will be advanced treatment process with the construction and operation experience in other water and
14、 then to improve the depth of processing plant. East Lake waterworks existing process can meet the current water quality requirements, water quality objectives in order to achieve the groups proposed in the Luohu area to provide users with safe, direct drinking water treatment plant in East Lake, th
15、e water quality meet the requirements is the foundation.2, no internal anti-corrosion water supply pipelineBuried pipelines in Luohu area are relatively early. According to the company survey, most municipal metal pipes laid before 1990 did not take internal corrosion protection measures. According
16、to the burial date, within the scope of Luohu branch, there are not nearly 30 km of inner corrosion protection pipelines, and the pipe diameter is mainly between DN200 - 400. This section of the pipeline used so far, the pipe fouling phenomenon is more common and serious, not only affect the water c
17、apacity, but also affect the water quality of the pipe network. The company has been in 2002 and 2003 respectively in Luohu Beidou road DN400 tube and DN400 tube Bamboo Road Renovation carried out lined, before the transformation of the original pipe endoscope examination also found that the fouling
18、 phenomenon is more serious, since the pipeline operation after the transformation, the indicators of water quality in the pipeline shall meet the water quality standard. The two sections of the renovation of DN400 tubes total about 2300 meters. The company has conducted a survey on the rest did not
19、 do the pipeline corrosion, according to the first director branch, after the first large caliber small caliber, each year arrangement principle of Huangbeiling DN400 pipe, DN300 pipe, DN400 gorgeous road and other sections of the renovation should be arranged.3, old residential networkCompanies spe
20、nd huge sums of money every year on the serious problems of residential pipe network transformation. The main problem is the existence of the community network: the small caliber pipeline with the original residential pipeline is almost all galvanized steel (except in recent years has been the trans
21、formation of the use of galvanized steel), after a certain age, there are serious corrosion problems, internal corrosion caused encrustation, poor water quality, water cross section reduction; external corrosion cause the pipe wall thinning, pipeline leakage and fracture, Water Leakage increased, in
22、creased maintenance. Especially the natural village water supply network is more chaotic, the existing problems are more complex, and some natural villages pipes and valves are laid in the sewage ditch, not only to accelerate the corrosion of the pipeline, but also affect water quality. Shenzhen Con
23、struction Bureau issued a notice on the application of new plastic water supply pipes in 1999, requiring the gradual elimination of galvanized steel pipe. The company has been on the east garden, and so many gorgeous Nishimura cell network using UPVC pipe, PE pipe and steel plastic composite pipe fo
24、r pipe network transformation. According to the survey, the Luohu branch has received 588 of the intermediate layer, a total of more than 106200 end-users, the average daily water consumption of about 130 thousand cubic meters.What water quality problems will there be after receiving a large number
25、of intermediate layers? How can we respond? We recommend the group to make an assessment in conjunction with the direct drinking target.4, fire hydrant and not connected to the users mouthThe pipeline design and construction of the early common with the interval of 120 meters to set up a DN200 (or D
26、N150) to the left, to facilitate the user connection of pipes (without water pipe), the municipal road is about 120 meters in the fire hydrant spacing. But according to the actual operation situation, many reserved ports do not connect with users, and do not play their intended role. Especially with
27、 the Luohu area situation, within the scope of Luohu municipal construction and city development has been basically formed, the water supply pipeline on the development of new users do not have the space, the original design of the reserved port function, most users have access to the remaining tube
28、, have yet to take over, basically have no reservation, idle without reservation pipes have become network numerous “arm“, because of its long stagnation tube does not flow into “stagnant water“, affecting water quality. Group companies have done a special investigation, and found that the long-term
29、 use of the water left in the mouth of the pipe, water quality is quite poor, the most serious similar to blackwater“. In view of the fact that there is no water supply on the pipeline and the technique of open pipe taking is more and more mature, the necessity of the reserved port is decreasing day
30、 by day, especially after the construction, the reserved mouth of the user who has not been connected has become a bane to the water quality of the pipe network. The dispatch center organized branch offices in 2001 - 2002 to investigate the reserved ports and to arrange for the abolition of the rese
31、rved ports which did not play a part. Luohu branch has abolished 57 reserved ports. According to our recent survey, there are more than 30 reserved ports for non connection users in Luohu. They should be arranged in accordance with the future development and will be arranged at the appropriate time.
32、Branch of the total jurisdiction of more than 1200 fire hydrants, because each hydrant from the municipal pipe opening after the connection, there are 5 meters or so DN100 pipeline, the section of the tube is also a long time into “dead water“, the water quality is unfavorable. The company now provi
33、des every six months must be a discharge of the fire hydrant, according to our experience, the first half of the frequency of the first discharge protection effect on water quality, but six months after discharge, there is still a short time phenomenon of dirty water. In March this year, we Buxin Do
34、ng Le road and other sections of the fire hydrant at intervals of emissions sampling tests for 3 months, compared to the initial discharge of water and clean the water sample test results, we found that the initial discharge of water exceed the standard seriously. We believe that it is necessary to
35、increase the number of fire hydrants, and the specific discharge intervals should be further investigated and analyzed (the test results are shown in Table 3, table 4 below).5 and two water supply facilitiesThe two water supply is through the pool (box), water pump and other users to supply a water
36、supply mode. Branch is now managing 22 two pressure pumping station, according to the survey, there are 33 two pressure pump station is not received (excluding high-rise residential), a total of more than 12000 households.The two main factors affecting the water quality of the water supply facilitie
37、s are: the sundry pool (box) “three“ (manhole, vent and overflow pipe) into the tank; an overflow pipe, drain pipe outlet to other foreign material into the;The retention time of the water in the tank is too long, the stagnant water appears in some areas, and the inner wall of the pool (tank) is pol
38、luted.The two water pools (boxes) under the jurisdiction of the group are all cleaned by the engineering branch every quarter, and sampling and testing are conducted to ensure the regular cleaning of the water tank.There are 11 pumping stations, now run 19 booster pump station in the pool is open se
39、t, cover plate, iron plate, reinforced concrete cover and other forms, forms, specifications, but there are serious corrosion problems after years of use, skin peeling off rust rust slag pool, affecting the water quality.6, pipeline construction and emergency repairThrough the continuous strengtheni
40、ng of pipe network management, the network operation pipeline requirements are constantly improving, in the pipeline construction process, may affect the water quality links also strengthened supervision. But in contrast to drink, there are some links still need to be explored and improved, such as
41、the interface section of the pipe steel and ductile iron pipe and other metal pipes, while the tube body part has done internal corrosion, but did not do the anti-corrosion pipe interface part. When blasting pipe repair, there may be slag and other falls into the pipe; the pipeline interface parts c
42、an not be filled for internal corrosion protection, etc The above problems to solve and avoid, one should be in daily work to strengthen management, to take the necessary measures to ensure the water quality requirements of repair, pipeline construction process to strengthen supervision, to ensure t
43、he quality of construction, on the other hand, the research needs further refinement, some aspects of the work, find a way to solve the problem.Fire hydrant discharge before water quality index table 3 Analysis ProjectThe statistical items turbidity PH chlorine color smell and taste of total colifor
44、m bacteria by manganese iron and zinc (NTU) (mg/l) (of) (class) visible (/ml) (CFU/333 ml) (mg/l) (mg/l) (mg/l) the maximum value of 22608.83 0.13960 (3) a large number of yellow mud taste 93000.02 1.18 0.06 a minimum of 287.66 0.0188 (2) clay mud taste 300.01 0.43 0.02 1016.8 8.118 0.092 475.8 aver
45、age (2.2) 229.40 0.012 mud taste 0.604 0.032 standard 3 6.58.5 15 (0) had no visible on 10010.1 0.31 exceed the standard exceed the standard qualified qualified qualified qualified exceed the standard exceed the standard exceed the standard exceed the standard 339 times 32 times 2.3 times 2 times th
46、e fire hydrant after discharge the water quality index table 4 project analysisThe statistical items turbidity PH chlorine color smell and taste of total coliform bacteria by manganese iron and zinc (NTU) (mg/l) (of) (class) visible (/ml) (CFU/333 ml) (mg/l) (mg/l) (mg/l) the maximum value of 4.26 7
47、.24 0.517 (0) a small amount of yellow 300.02 0.22 0.02 0.36 7.02 0.012 no minimum (0) 0.01 0.05 0.02 1.164 7.128 0.322 5.6 average (0) 1.20 0.012 0.084 0.02 3 standard 6.58.5 15 (0) without visible 10010.1 0.And do some exploration work of the discharge cycle (this work is and water quality testing
48、 center in cooperation); do the valve management work, recently to continue to do the cleaning and maintenance work to ensure the valve shaft, valve wells in good working condition, not because of the valve problem affecting the water quality.In short, we must do the daily management according to th
49、e requirements of direct drinking, ensure that the construction of pipeline, repair and management of the two water supply facilities and other links do not produce new water quality problems.4, suggestionsAs Huang Dong in “the best in 2004 to complete the tasks“ pointed out in “direct drinking water is a system and complex project, involving many aspects from the water to the user terminal, this work should be in accordance with the“ loss from easy to difficult, step by step “principle“. We believe that the branch in preparation of the basic work at the same time,
