In treatment of sludge from water works, sludge water quality characteristics of the analysis of specific works, pay attention to the essential differences between the water plant sludge and sewage sludge.This paper discusses a number of issues studied waterworks sludge treatment technologies, such as how to properly determine the sludge dry solids yield water plant , how to reduce water plant rows of mud settling ponds of water, why do you want to set a balanced sludge flood storage pool and so on.

   In waterworks Sludge treatment combined with several years of scientific research and engineering practice, some of the experiences, lessons learned and experience, contact domestic and foreign several waterworks and sewage sludge treatment plant projects visited during the harvest research, experience and reflection, made the following observations and recommendations on a number of issues waterworks, sludge treatment technologies for our construction of waterworks sludge treatment and research information. 

   1. how to get reasonable value in water treatment plant sludge scale engineering design

   Water plant sludge water treatment engineering design work, in addition to effective control water coagulation sedimentation tank sludge water Nissan water, filter flushing water and wastewater Nissan filter once a single cell washing wastewater, the more important is the need to waterworks sludge dry solids per day design reasonable value scale, which directly affects the selection of sludge dewatering machinery configurations, related equipment and structures and design with a direct impact on the entire sludge treatment and sludge disposal project investment normal and reasonable future projects and the possibility of running.
   The dry solids content of waterworks sludge by mud water, water purification process interception, humus, algae removal of sediment in raw water suspended impurities and water adding coagulant, coagulant, composed of two parts, the former accounted for the major proportion.
   Daily water quality testing project waterworks, closely related with suspended impurity content in raw water is the main raw water turbidity NTU value. Turbidity meter water turbidity NTU value is measured by optical instrument light source scattering light intensity is measured based on water, can effectively detect the water is the main impurity particles of colloidal size range. Due to the suspended particles size and shape in various water sources are not the same, so all kinds of source water turbidity NTU value does not have a fixed ratio can be directly converted to reflect the suspended impurity concentration SS value (Mg/L) size. Therefore take water from different sources of water before the sludge water treatment engineering design, the general should first source water sampling on the different periods of the turbidity value of NTU a series of synchronous detection comparative and raw water suspended solids, SS value. The large amounts of data for mathematical regression and correlation analysis, the correlation between NTU and SS values, then contact the water situation and recent turbidity data statistical analysis, daily processing scale can determine the water treatment plant sludge sludge dry solids DS. The correlation value if not carefully according to the actual situation of local water quality of water source to obtain reliable NTU:SS, dry sludge DS deal with the scale of possible and actual far treatment project is estimated Waterworks sludgewater, perhaps even more than one or two times worse! Seriously affect the rationality of the engineering construction

   2. a reasonable selection of polyacrylamide problems

   In order to improve the performance of the water plant sludge dewatering, sludge concentration of mechanical dewatering of sludge before adding organic high polymer polyacrylamide proper (PAM) to reduce the specific resistance of sludge, which makes it easy to dehydration. Polyacrylamide with anionic, cationic and nonionic three categories, from technical and economic aspects of comprehensive measure, through rational screening test the water is more suitable for PAM type and brand
   Hydrophilic colloidal particles containing organic compounds in sewage sludge based, particle Zeta potential negative is strong, sludge dewatering in general to join the right amount of cationic PAM, charge neutralization and flocculation of particles' bridge colloidal particles, the sludge dehydrated easily. Waterworks sludge containing sediment and other inorganic constituents of particles, and in the purifying water process has been added aluminum or iron salt coagulant, particle Zeta potential negative significantly reduced, so the water plant sludge concentration by adding proper amount of PAM in the dehydration before from the main frame bridge mud particle flocculation and reduce the specific resistance of sludge opsonization consideration. The production test in lab and plant were confirmed: PAM anionic and cationic PAM were similar in the dosing rate (Yang type dosing rate is generally slightly higher than the negative) circumstances, can play a similar ideal to reduce the specific resistance of sludge and centrifuge dewatering sludge containing good results more than 35% of the fixed rate (separation liquid in sludge dewatering after the separation of liquid turbidity turbidity, cationic PAM low). Because of the commodity price than unit weight of anionic cationic PAM PAM high 1 times, so the water plant sludge dewatering PAM conditioner should choose the acrylamide monomer content of less than high molecular weight anionic type 0.05% PAM. The nonionic PAM for slow dissolution rate, generally not used for sludge conditioning

   3. reasonable conduct advection mechanical sludge sedimentation tank, reducing the amount of water consumed Sludge

   Many of our stratospheric water plant sludge sedimentation tank machinery, mechanical suction implementation time to start along the entire length of the pool suction mode automatically mud mud bottom plot. Since advection sedimentation tank bottom sludges are mainly concentrated in the front near the flocculation tank about 1/3 sedimentation pond long range, so the rear end of the sedimentation tank 2/3 of the pool of muddy water discharged from long range solid content is often very low, resulting in water will be a corresponding increase in the cost of sludge treatment plant in stratospheric water when sludge sedimentation tank consume more, the implementation of water treatment sludge
   In order to reduce the mud water unnecessary consumption, must be to improve the overall content of sludge sedimentation rate through reasonable mud. Recommendations will be horizontal flow sedimentation pool mechanical ways of mud by manual or automatic timing starting along the entire pool of whole mud discharging mode, to the sludge deposit in the bottom of the introduction of intelligent automatic segmentation effectively mud way. Specific approach is: in the suction machine is arranged at the appropriate height from the bottom of the pool of sludge by ultrasonic instrument, when the front-end 1/3 pool strengths of sedimentation tank sludge deposit in the bottom of a certain thickness, sludge interface monitor automatically start the suction front-end 1/3 pool long range of bottom mud suction machine; sedimentation tank back-end 2/3 cell the scope for deposit less, can be set in the front end 1/3 pool long range suction machine automatically by the mud suction from the start of two or three mud after the stroke, and then along the entire length of the whole operation of sedimentation tank sludge discharge time. Intelligent such automatic segmentation mud can significantly reduce the mud water, saving water and energy, but also a corresponding reduction in the capital and operating cost of sludge concentration tank, regulating pond. Setting control intelligent mud interval by mud in front of tank bottom sludge thickness, should be to prevent the accumulation of mud for a long time may lead to corruption, sediment quality effect of precipitation pool water is degree