Coagulation/flocculation in dewatering of sludge: A review.

Chitosan is a biopolymer obtained from chitin, one of the most abundant and renewable materials on Earth Chitin is a primary component of cell walls in fungi, the exoskeletons of arthropods such as crustaceans, eg, crabs, lobsters and shrimps, and insects, the radulae of molluscs, cephalopod beaks, and the scales of fish and lissamphibians The discovery of chitin in 1811 is attributed to Henri Braconnot while the history of chitosan dates back to 1859 with the work of Charles Rouget The name of chitosan was, however, introduced in 1894 by Felix Hoppe-Seyler Chitosan has attracted major scientific and industrial interests from the late 1970s due to its particular macromolecular structure, biocompatibility, biodegradability and other intrinsic functional properties Chitosan and derivatives have practical applications in the food industry, agriculture, pharmacy, medicine, cosmetology, textile and paper industries, and in chemistry In recent years, chitosan has also received much attention in dentistry, ophthalmology, biomedicine and bioimaging, hygiene and personal care, veterinary medicine, packaging industry, agrochemistry, aquaculture, functional textiles and cosmetotextiles, catalysis, chromatography, beverage industry, photography, wastewater treatment and sludge dewatering, and biotechnology Nutraceuticals and cosmeceuticals are actually growing markets, and therapeutic and biomedical products should be the next markets in the development of chitosan Chitosan is also the object of numerous fundamental studies In this review, we highlight a selection of works on chitosan applications published over the past two decades

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Applications of chitosan in food, pharmaceuticals, medicine, cosmetics, agriculture, textiles, pulp and paper, biotechnology, and environmental chemistry

Critical review on dewatering of sewage sludge: Influential mechanism, conditioning technologies and implications to sludge re-utilizations.

Application of coagulation/flocculation in oily wastewater treatment: A review.

A review on wastewater sludge valorisation and its challenges in the context of circular economy

Sludge dewaterability of a starch-based flocculant and its combined usage with ferric chloride

Efficient removal of phosphorus from turbid water using chemical sedimentation by FeCl3 in conjunction with a starch-based flocculant.

The invention discloses a natural polymeric flocculant and ferric salt combined deep dephosphorizing and mud-removing technology. The technology comprises the following steps: (1) using a natural polymeric flocculant, wherein the natural polymeric flocculant is available in the market and self-prepared, types of the natural polymeric flocculant are a neutral natural polymeric flocculant, a cation-type natural polymeric flocculant, an anion-type natural polymeric flocculant or an amphiprotic-type natural polymeric flocculant; and (2) firstly adding ferric salt, and adding the natural polymericflocculant. The technology is capable of reducing an addition quantity of the ferric salt in a water body while achieving the effect of deeply dephosphorizing, and effectively reducing turbidity and an SS value, without introducing other potential organic pollutants, thereby guaranteeing cleanness and safety of the water body.

Natural polymeric flocculant and ferric salt combined deep dephosphorizing and mud-removing technology

The invention relates to a composite flocculating agent used for removing phosphorus and turbidity of wastewater. The composite flocculating agent is a composite flocculating agent prepared by mixinga natural polymer flocculating agent and an inorganic salt coagulant and performing curing. The composite flocculating agent provided by the invention is directly added to treat the phosphorus-containing wastewater, under the condition that a requirement for a total phosphorus content (TP) of 0.3 mg/L or less in a water quality standard of IV-type surface water is achieved, the composite flocculating agent can reduce the suspended substance (SS) value of effluent water to 10 mg/L or less, but when only an inorganic coagulant is adopted, the goal cannot not be achieved, so that the composite flocculating agent ensures that the effluent water meets national wastewater discharge standards in China. The invention discloses a preparation method of the composite flocculating agent.

Composite flocculating agent used for removing phosphorus and turbidity of wastewater as well as preparation method and application of composite flocculating agent

Jie Ren

Papers

Coagulation/flocculation in dewatering of sludge: A review.

Sludge dewaterability of a starch-based flocculant and its combined usage with ferric chloride

Efficient removal of phosphorus from turbid water using chemical sedimentation by FeCl3 in conjunction with a starch-based flocculant.

Natural polymeric flocculant and ferric salt combined deep dephosphorizing and mud-removing technology

Composite flocculating agent used for removing phosphorus and turbidity of wastewater as well as preparation method and application of composite flocculating agent