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The?black?and?smelly?water?body?is?a?water?body?that?presents?unpleasant?color?and?emits?unpleasant?odor.?The?odor?of?the?water?body?is?due?to?the?odor?generated?by?domestic?sewage?washing?clothes?/?toilet?water.?The?black?water?body?is?due?to?the?deposition?of?pollutants,?and?the?water?itself?is?not?black.?According?to?the?test?data,?the?water?quality?standard?for?mild?black?odor?is?that?the?ammonia?nitrogen?content?in?water?exceeds?7Mg?/?L.

According?to?the?research?results?of?CMRC's?National?Research?Report?on?the?treatment?of?black?and?smelly?water?bodies,?there?are?three?main?ways?to?form?black?and?smelly?water?bodies:?first,?the?domestic?sewage?caused?by?the?direct?discharge?of?sewage,?the?confluence?of?rain?and?sewage?or?the?damage?of?urban?pipe?network?enters?the?river?channel?through?the?city?to?form?black?and?smelly?water?bodies;?The?second?is?that?the?residents?throw?the?garbage?at?random,?polluting?the?river,?or?the?garbage?piles?are?washed?by?the?rain?to?form?a?black?and?smelly?water?body;?The?third?is?the?phenomenon?of?dead?water?and?dead?lake?caused?by?the?slow?flow?rate?of?the?water?body,?forming?a?black?and?smelly?water?body.

Before?2015,?the?government?paid?less?attention?to?the?treatment?of?black?and?odorous?water?bodies.?In?2015,?the?state?began?to?pay?attention?to?the?water?environment?quality,?issued?the?action?plan?for?water?pollution?prevention?and?control?and?the?"ten?water?items",?and?proposed?for?the?first?time?that?the?number?of?black?and?odorous?water?bodies?should?be?used?as?an?indicator?to?measure?the?water?environment?quality.?It?is?required?that?by?2030,?the?black?and?odorous?water?bodies?in?urban?built-up?areas?should?be?generally?eliminated.?Therefore,?the?treatment?of?black?and?odorous?water?bodies?in?urban?built-up?areas?has?been?started.?Local?government?departments?have?successively?issued?work?guidelines,?guiding?opinions,?implementation?plans?and?other?policies?on?the?treatment?of?black?and?odorous?water?bodies?in?urban?and?rural?areas.?From?2016?to?2018,?the?relevant?policies?on?the?treatment?of?black?and?odorous?water?bodies?in?urban?built-up?areas?were?mainly?released.?From?2019,?the?relevant?policies?on?the?treatment?of?black?and?odorous?water?bodies?in?rural?areas?were?successively?released.

Fig.?1?national?policy?analysis?of?black?and?odorous?water?treatment?industry

As?an?important?measure?to?solve?the?problem?of?black?and?smelly?water?bodies,?rain?and?sewage?confluence?transformation?has?been?carried?out?in?various?places.?However,?due?to?the?early?construction?of?some?cities,?the?housing?construction?does?not?support?the?large-scale?rainwater?and?sewage?confluence?reconstruction?project,?and?the?branch?pipe?to?household?cannot?be?realized.?Therefore,?before?the?housing?reconstruction,?the?intercepting?well?product?is?the?best?method?for?the?municipal?pipe?network?reconstruction.

The?intercepting?well?products?are?divided?into?two?categories:?traditional?intercepting?well?(including?pressure?gate?intercepting?well)?and?integrated?intercepting?well.?Compared?with?traditional?intercepting?well,?the?integrated?intercepting?well?uses?metering?components?such?as?rain?gauge?and?liquid?level?gauge?to?control?the?opening?and?closing?of?the?intercepting?valve,?which?can?achieve?better?diversion?effect,?but?also?has?the?disadvantages?of?high?cost?and?short?service?life.?Therefore,?the?market?opportunities?of?the?integrated?intercepting?well?are?mainly?concentrated?in?the?sewage?direct?outlets?on?both?sides?of?the?river?that?need?to?control?the?opening?and?closing?of?the?intercepting?valve?in?the?sunny?and?rainy?seasons,?and?the?part?where?the?pipe?diameter?at?the?end?of?the?reconstruction?of?the?rainwater?and?sewage?confluence?pipeline?is?dn600-dn1000.?The?construction?of?the?integrated?intercepting?well?is?simpler?than?the?pressure?gate?intercepting?well.?Meanwhile,?the?water?flow?is?large,?and?there?are?higher?requirements?for?the?measuring?components?such?as?the?rain?gauge?and?the?liquid?level?gauge,?The?application?of?integrated?shut-off?well?can?achieve?better?diversion?effect.

Fig.?2?Comparison?and?analysis?of?products?of?traditional?intercepting?well?and?integrated?intercepting?well

From?the?current?market?application?situation,?the?proportion?of?rainwater?and?sewage?confluence?that?cannot?be?treated?by?branch?pipes?to?households?and?needs?to?be?treated?by?intercepting?well?equipment?exceeds?75%,?of?which?the?use?of?integrated?intercepting?wells?accounts?for?about?10%.?The?government?has?made?great?efforts?to?renovate?the?confluence?of?rain?and?sewage?and?promote?the?construction?of?green?water?conservancy?projects.?The?intercepting?well?is?indispensable.?As?a?new?intelligent?product,?the?integrated?intercepting?well?will?develop?steadily?in?the?future.