41results about How to "Stable water production" patented technology

The present invention addresses the problem of providing a method for cleaning a separation membrane, the method making it possible to prevent an increase in differential pressure while reducing the amounts of a chemical and rinse water necessary for cleaning the membrane and while inhibiting the inside of the separation membrane module from increasing in pH through the cleaning. The method is a water production method which comprises: a step for yielding water to be membrane-filtered, by treating raw water; a filtration step in which the water to be membrane-filtered is filtered with a separation membrane module having a separation membrane to thereby yield membrane-filtered water; a back-pressure washing step in which the substances that were filtered out and that clogged the separation membrane in the filtration step are removed using washing water; and a drainage step in which the washing wastewater used for washing in the back-pressure washing step is drained. The step for yielding water to be membrane-filtered comprises a coagulation step in which a first pH regulator and a cationic coagulant are added to the raw water to coagulate substances which are contained in the raw water and are to be filtered out, thereby producing pretreated water. The pH of the water to be membrane-filtered and the pH of the washing water are regulated to values satisfying specific requirements.

A water making method is disclosed. The water making device is provided with a heat exchanger and a condenser, wherein the heat exchanger heats sea water through cooling water cooling an internal combustion engine, reduces the pressure of the sea water to be lower than the atmospheric pressure and generates water vapor; the condenser cools the vapor generated by the heat exchanger to generate distilled water; the condenser comprises a bypass channel connecting the upstream side and the downstream side of the heat exchanger; and the cooling water in the downstream side of the heat exchanger is returned to the cooling water in the upstream side through the bypass channel.

A heat return type multi-stage flash evaporation apparatus for desalinating seawater is composed of the circulating saline pipeline in heat releasing segment, mutually communicated several flash evaporation chambers in heat-recovering segment and heat-releasing segment respectively, and the circulating saline pipeline with condensing tube and saline heater in the heat-recovering segment. Their connection scheme is also disclosed.

The invention discloses a sea water desalination device, which relates to the technical field of sea water desalination. The interior of a tank is provided with a cavity, the sidewall is provided withone or two openings, and the openings are closed by cover plates; an evaporator is arranged in the cavity and distanced from the wall of the cavity, the evaporator comprises a primary liquid-absorbing layer and pipelines buried in the primary liquid-absorbing layer, and both the inlets and outlets of the pipelines pass through the cover plates to communicate with the outside; at least one layer of secondary evaporation layer is concentrically arranged around the periphery of the evaporator, and is spaced for a predetermined distance, and the secondary evaporation layer consists of a condensing plate and a secondary liquid-absorbing layer which are in tight contact; both the primary liquid-absorbing layer and the secondary liquid-absorbing layer are a porous material, at least the part, which is in contact with the primary liquid-absorbing layer and the secondary liquid-absorbing layer, of one or two cover plates is the porous material, and pores in the primary liquid-absorbing layer,the secondary liquid-absorbing layer and the cover plates communicate with one another. The sea water desalination device can sufficiently recycle residual heat, so that the water production ratio isincreased, and water can still be stably and efficiently produced under a shaking state.

The invention relates to a method for preparing a forward osmosis emergency drinking water bag prepared by a layer-by-layer self-assembly method. The drinking water bag is prepared by sealing two forward osmosis membranes. The osmotic membrane is prepared by a layer-by-layer self-assembly method. The outer side of the water bag is the active layer of the forward osmosis membrane, and the inner side of the water bag is the support layer, which is in contact with the drawing liquid. Standard drinking water has the characteristics of energy saving and economy. On the premise of ensuring the effective interception of organic pollutants and heavy metal ions, the water production is stable, and the water flux can reach 1.7-3.5L / (m 2 h). Provide safe and delicious drinking water solutions for end users in emergency situations such as natural disasters, unexpected dangers, and wild survival in the absence of material rescue and lack of clean water sources, and provide them in line with the national "Drinking Water Hygiene Standards" (GB5749‑2006) purified water.