Low-temperature low-turbidity water treatment device and treatment method

Abstract

The invention discloses a low-temperature low-turbidity water treatment device and treatment method. The low-temperature low-turbidity water treatment device comprises an electrolytic bath, a sedimentation tank, a water inlet pipe and a water outlet pipe, wherein electrode plates are arranged inside the electrolytic bath; the electrode plates include a cathode plate and a soluble anode plate; thecathode plate and the soluble anode plate are connected with a power supply; a permanent magnet is arranged on the outer side wall of the electrolytic bath; the sedimentation tank is communicated withthe electrolytic bath through a middle water conveying pipe; a bottom sludge discharging pipe of the sedimentation tank is communicated with a residual sludge discharging pipe and a sludge reflowingpipe respectively; the output end of the sludge reflowing pipe is communicated with a bottom sludge inlet of the electrolytic bath; a sludge reflowing pump is arranged on the sludge reflowing pipe; the output end of the water inlet pipe is communicated with a bottom water inlet of the electrolytic bath; the input end of the water outlet pipe is communicated with a water outlet of the sedimentationtank. Effluent water treated according to the technical scheme adopted by the invention can meet a requirement on the water quality of influent water of a subsequent ordinary sand filter, so, that effluent water from a water purifying plant can meet the hygienic standard of domestic drinking water (GB5749-2006) is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a low-temperature and low-turbidity water treatment device and a treatment method. Background technique [0002] As a very important link in the water treatment process, coagulation is a leading process. The quality of this link will directly affect the treatment effect of the subsequent sedimentation and filtration process. Coagulation has always been an indispensable unit in the entire treatment process. However, in the northern region with severe cold climate, the raw water temperature is in a low temperature and low turbidity state for about half a year from winter to the end of spring of the following year. Generally, the water temperature is 5°C or below, and the turbidity is 5-20NTU. Due to the low turbidity, the content of large particles such as clay is small, and the concentration of impurities in water is small, some flocs lose the conditions fo...

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Problems solved by technology

Due to the low turbidity, the content of large particles such as clay is small, and the concentration of impurities in water is small, some flocs lose the conditions for collision, and the probability of particle contact and collision is low, which is not conducive to particle collision and settlement, which leads to poor treatment effect; Low means that the diffusion movement of small particles will be weakened, the hydration film effect of water molecules will be enhanced, the viscosity coefficient of water will increase, the thermal movement of molecules will be slow, the ξ potential of colloidal particles will be high, the probability of mutual collision will be less, and the colloidal stability will be enhanced, resulting in Difficult water quality

In addition, low water temperature also affects the hydrolysis of the agent. Incomplete hydrolysis leads to poor coagulation effect, small and loose flocs, and it is difficult for sedimentation to remove the impurity particles of flocs formed.

[0003] In order to ensure the water quality and water quantity of the water plant and reduce the operating cost of the water plant, it is unrealistic to generally increase the advanced treatment. Therefore, it is necessary to provide a method of strengthening coagulation to improve the quality of the effluent water so that it can meet the specification requirements

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